JP2012013280A - Water heat source heat pump unit piping system - Google Patents

Abstract

A water heat source heat pump unit piping system capable of reducing the power of a heat source water pump while maintaining the function of each water heat source heat pump unit installed in a plurality of groups.
A system 10A performs a normal operation mode and an energy saving operation mode depending on the temperature of heat source water. In the normal operation mode, the supply amount of the pump 13 is maintained at a normal flow rate, the heat source water supplied from the pump 13 is fed from the feed main pipe 15a into the feed branch pipes 16a of the groups 18 to 21, and heat exchange is performed in the units 14a to 14d. The heat source water thus made is caused to flow from the return branch pipe 16b of the groups 18 to 21 into the return main pipe 15b. In the energy saving operation mode, the heat source water exchanged in the units 14a and 14c of the groups 18 and 20 flows into the feed pipes 16a of the groups 19 and 21 via the bypass pipes 39 and 45, and the heat source water is supplied to the unit 14b. , 14d again.
[Selection] Figure 1

Description

  The present invention relates to a water heat source heat pump unit piping system for cooling or heating a plurality of air-conditioned spaces by a water heat source multi-type heat pump unit.

  A variable capacity compressor, four-way valve, heat source water side exchanger that exchanges heat between the heat medium and heat source water, an air conditioning heat exchanger that exchanges heat between the heat medium and air, and an expansion valve And a plurality of water heat source heat pump units connected by piping, and a heat source device that supplies the heat source water temperature-controlled to each heat source water side heat exchanger of these water heat source heat pump units via a circulation pipe, and these water heat sources The heat pump unit detects the temperature of the air to be controlled, operates the frequency of the compressor, measures the inlet temperature of the heat source water, and has a variable capacity heat source water pump and a check valve. There is a control method of a heat source heat pump unit system (see Patent Document 1).

  These water heat source heat pump units perform a refrigeration cycle in which the heat medium is evaporated by the air conditioning heat exchanger during cooling by switching the four-way valve and the heat medium is condensed by the air conditioning heat exchanger during heating by switching the four-way valve. Each water heat source heat pump unit can perform an operation in which cooling operation, heating operation, and air blowing operation are mixed in the heat source water system.

JP 2007-315682 A

  The control method disclosed in Patent Document 1 controls the supply amount of heat source water flowing into these water heat source heat pump units in units of these units. However, in this control method, since the supply amount of heat source water is not controlled for each of a plurality of air conditioning target groups formed from these water heat source heat pump units, the supply amount of heat source water and heat source water supplied to these groups are not controlled. The output of the circulating heat source water pump cannot be reduced according to the air conditioning load, and the power of the heat source water pump cannot be reduced while maintaining the functions of the water heat source heat pump units installed in those groups.

  An object of the present invention is to reduce the supply amount of heat source water supplied to a plurality of air conditioning target groups formed from a predetermined number of air conditioning spaces and the output of a heat source water pump that supplies heat source water according to the air conditioning load. It is possible to provide a water heat source heat pump unit piping system capable of reducing the power of the heat source water pump while maintaining the function of each water heat source heat pump unit installed in the group.

  The premise of the present invention for solving the above-mentioned problems is that a plurality of air-conditioning target groups formed from a predetermined number of air-conditioned spaces, a heat source device that cools or heats the heat source water, and the heat source water into those groups and heat source devices A main pipe to be circulated, a branch pipe that branches from the main pipe into each group and extends to each air conditioning space of the group, a heat source water pump that is installed in the main pipe and supplies heat source water to the main pipe and the branch pipe, and for each group A water heat source multi-type heat pump unit that is installed individually in each air-conditioned space and cools or heats the air-conditioned space using the heat source water flowing in the branch pipes, and heat source water from the main pipe to the branch pipe In addition to flowing into the feed branch pipes, heat source water is sent from the feed branch pipes to these units, and the heat source water heat exchanged in these units is sent from the units. With return to the branch pipe went back out of the tube, a water source heat pump unit piping system for flowing from the branch pipe went back to the heat source water went back main of the main pipe.

  As a feature of the present invention based on the premise, the water heat source heat pump unit piping system includes a temperature sensor that measures the temperature of the heat source water heat-exchanged in each unit of the group, and a heat source heat-exchanged in each unit of one group A bypass pipe that allows water to flow into each unit of the other group, and a control mechanism that executes either the normal operation mode or the energy-saving operation mode of the system based on the temperature of the heat source water output from the temperature sensor, The normal operation mode allows the heat source water supplied from the heat source water pump to flow into the feed branch pipes extending from the main pipe to each air conditioning space while maintaining the supply amount of the heat source water pump at a normal flow rate. The return branch pipe that extends the heat source water heat-exchanged in each unit to each air-conditioned space of those groups In the energy saving operation mode, the heat source water exchanged in each unit of one group is caused to flow into each unit of the other group through the bypass pipe, and the heat energy of the heat source water is transferred to the other unit. It is possible to use again in each unit of the group and to reduce the supply amount of the heat source water pump from the normal flow rate.

  As an example of the present invention, when the temperature of the heat source water output from the temperature sensor is higher than the set temperature in the heat source water cooling operation of the system, the control mechanism executes the normal operation mode of the system and is output from the temperature sensor. When the temperature of the heat source water is lower than the set temperature, the system energy saving operation mode is executed.

  As another example of the present invention, in the heat source water heating operation of the system, when the temperature of the heat source water output from the temperature sensor is lower than the set temperature, the control mechanism executes the normal operation mode of the system, When the output temperature of the heat source water is higher than the set temperature, the energy saving operation mode of the system is executed.

  As another example of the present invention, the bypass pipe is connected to a return branch pipe that extends in the vicinity of the return main pipe and extends to each air-conditioned space of one group, and in the vicinity of the feed main pipe and that of each of the other group. A temperature sensor is installed in the return branch near the return main pipe, and the temperature of the heat source water flowing in the return branch pipe is measured in the energy saving operation mode. The heat source water subjected to heat exchange in each unit flows into the bypass pipe from the return branch pipe extending to each air conditioning space of one group, and the heat source water is fed to each air conditioning space of the other group via the bypass pipe. To flow into.

  As another example of the present invention, a bypass pipe is connected to a return main pipe extending between one group and the other group, and is connected to a feed main pipe extending between one group and the other group. The temperature sensor is installed in the return main pipe extending between one group and the other group, measures the temperature of the heat source water flowing through the return main pipe, and in the energy saving operation mode, heat exchange is performed in each unit of one group. The heated heat source water flows into the bypass pipe from the return main pipe extending between the one group and the other group, and the heat source water flowing to the return main pipe extending between the one group and the other group is passed through the bypass pipe. It is made to flow in the feed main pipe which the branch pipe extended to each unit of the other group connects.

  As another example of the present invention, the branch pipes of the group include the flow rate of the heat source water flowing to the feed branch pipe and the return branch pipe of one group and the heat source water flowing to the feed branch pipe and the return branch pipe of the other group. A flow compensation mechanism is installed to make the same flow rate.

  As another example of the present invention, the system includes a pressure sensor that measures the pressure of the heat source water flowing in the main pipe and outputs the measured pressure to the control mechanism, and the control mechanism includes the pressure of the heat source water output from the pressure sensor. The supply amount of the heat source water pump is adjusted based on

  As another example of the present invention, the pressure sensor is installed in the branch of the end group in which the heat source water supplied from the main pipe of the group flows lastly, and measures the end differential pressure of the branch of the end group. The measured terminal differential pressure is output to the control mechanism.

  According to the water heat source heat pump unit piping system according to the present invention, one of the normal operation mode and the energy saving operation mode is executed based on the temperature of the heat source water output from the temperature sensor. Heat source water that has undergone heat exchange in each unit is caused to flow into each unit of the other group via a bypass pipe, and the heat energy of the heat source water is reused in each unit of the other group, and the supply amount of the heat source water pump Therefore, it is possible to reduce the heat energy of the heat source water in the other group without cooling the heat source water exchanged in one group and returning it from the main pipe to the heat source device. It can be reused for operation, heating operation, and air blowing operation. In the energy saving operation mode, since the heat source water exchanged in each unit of one group flows into each unit of the other group in the energy saving operation mode, compared with the case where the heat source water is supplied for each group in the normal operation mode. The supply amount of the heat source water can be halved at the maximum, and the supply amount of the heat source water supplied to these groups and the output of the heat source water pump supplying the heat source water can be reduced according to the air conditioning load. This system can reduce the power of the heat source water pump while maintaining the function of each water heat source heat pump unit installed in those groups, and can achieve energy saving of the entire system.

  In the heat source water cooling operation of the system, when the temperature of the heat source water output from the temperature sensor is higher than the set temperature, the normal operation mode is executed and the temperature of the heat source water output from the temperature sensor is lower than the set temperature The water heat source heat pump unit piping system that executes the energy saving operation mode, when the temperature of the heat source water heat exchanged in one group is lower than the set value, returns the heat source water to the heat source device without returning the heat source water to the heat source device. Since the heat source water is caused to flow into each unit of the other group, the heat source water can be reused for the cooling operation, the heating operation, and the air blowing operation of each unit of the other group. In the energy saving operation mode, the system causes the heat source water exchanged in each unit of one group to flow into each unit of the other group, and the thermal energy of the heat source water is supplied to the cooling operation or heating of each unit of the other group. Since it is used for operation and air blowing operation, the heat source water supply amount can be halved at a maximum compared to the case of supplying heat source water for each group in the normal operation mode. And the output of the heat source water pump that supplies the heat source water can be reduced according to the air conditioning load. This system can reduce the power of the heat source water pump while maintaining the function of each water heat source heat pump unit installed in those groups, and can achieve energy saving of the entire system.

  In the heat source water heating operation of the system, when the temperature of the heat source water output from the temperature sensor is lower than the set temperature, the normal operation mode is executed and the temperature of the heat source water output from the temperature sensor is higher than the set temperature When the temperature of the heat source water that has been heat exchanged in one group is higher than the set value, the water heat source heat pump unit piping system that executes the energy saving operation mode does not return the heat source water and return it from the main pipe to the heat source device. Since the heat source water is caused to flow into each unit of the other group, the heat source water can be reused for the cooling operation, the heating operation, and the air blowing operation of each unit of the other group. In the energy saving operation mode, the system causes the heat source water exchanged in each unit of one group to flow into each unit of the other group, and the thermal energy of the heat source water is supplied to the cooling operation or heating of each unit of the other group. Compared to the case where heat source water is supplied to each group or the other group in the normal operation mode, the supply amount of heat source water can be halved at most, because it is used for operation and air blowing operation. The amount of the heat source water supplied to the heat source and the output of the heat source water pump that supplies the heat source water can be reduced according to the air conditioning load. This system can reduce the power of the heat source water pump while maintaining the function of each water heat source heat pump unit installed in those groups, and can achieve energy saving of the entire system.

  In the energy saving operation mode, the heat source water heat-exchanged in each unit of one group flows into the bypass pipe from the return branch pipe extending to each air conditioning space of that group, and the return branch extending to each air conditioning space of one group The water heat source heat pump unit piping system in which the heat source water flowing in the pipe flows into the feed branch pipe extending to each air conditioning space of the other group through the bypass pipe is heat-exchanged in each unit of one group in the energy saving operation mode. Without returning the heat source water and returning the heat source water from the main pipe to the heat source device, the heat source water can flow into each unit of the other group, and the heat source water can be used for cooling operation, heating operation, and air blowing operation of each unit of the other group. Can be reused. In the energy saving operation mode, the system causes the heat source water exchanged in each unit of one group to flow into each unit of the other group, and the thermal energy of the heat source water is supplied to the cooling operation or heating of each unit of the other group. Compared to the case where heat source water is supplied to each group or the other group in the normal operation mode, the supply amount of heat source water can be halved at most, because it is used for operation and air blowing operation. The amount of the heat source water supplied to the heat source and the output of the heat source water pump that supplies the heat source water can be reduced according to the air conditioning load. This system can reduce the power of the heat source water pump while maintaining the function of each water heat source heat pump unit installed in those groups, and can achieve energy saving of the entire system.

  In the energy saving operation mode, the heat source water exchanged in each unit of one group is caused to flow into the bypass pipe from the return main pipe extending between the one group and the other group, and between the one group and the other group. The water heat source heat pump unit piping system in which the heat source water flowing to the return main pipe extending in between and flowing into the main pipe connected to the branch pipe extending to each unit of the other group via the bypass pipe is connected to one group or the other in the energy saving operation mode. If the group is formed of a plurality of groups, the heat source water exchanged in each unit of the one group is returned to the units of the other group without returning the heat source water from the main pipe to the heat source device. And the heat source water can be used to cool each unit in the other group. Operation and heating operation, it is possible to re-use the fan operation. In the energy saving operation mode, the system allows the heat source water exchanged in each unit of the one group to flow into each unit of the other group, and the heat energy of the heat source water is cooled in each unit of the other group. Since it is used for operation, heating operation, and air blowing operation, the supply amount of heat source water should be halved at a maximum compared to the case of supplying heat source water for each of those groups or for each of those other groups in the normal operation mode. The amount of heat source water supplied to these groups and the output of the heat source water pump that supplies the heat source water can be reduced according to the air conditioning load. This system can reduce the power of the heat source water pump while maintaining the function of each water heat source heat pump unit installed in those groups, and can achieve energy saving of the entire system.

  A flow compensation mechanism that makes the flow rate of the heat source water flowing in the feed branch pipe and the return branch pipe of one group the same as the flow rate of the heat source water flowing in the feed branch pipe and the return branch pipe of the other group is a group branch pipe. The water heat source heat pump unit piping system installed in the system is configured so that the heat source water flowing in one branch of the group differs from the heat source water flowing in the other group of branch pipes. When the exchanged heat source water is made to flow into each unit of the other group via the bypass pipe, each unit of the group with a high flow rate is affected by the group with a low flow rate, and an underflow rate is set for each unit of the group with a high flow rate. Trouble occurs. However, in this system, the flow rate compensation mechanism makes the flow rate of the heat source water flowing to the branch pipes of those groups the same, so that the heat source water heat exchanged in each unit of one group passes through the bypass pipe to the other group. When flowing into each unit, the group with a low flow rate compensates the flow rate of the group with a high flow rate, so that it is possible to prevent the occurrence of an excessive flow rate trouble in each unit of both groups.

  It includes a pressure sensor that measures the pressure of the heat source water flowing in the main pipe and outputs the measured pressure to the control mechanism, and the control mechanism adjusts the supply amount of the heat source water pump based on the pressure of the heat source water output from the pressure sensor The water heat source heat pump unit piping system can reliably adjust the supply amount of the heat source water pump based on the pressure of the heat source water output from the pressure sensor in the energy saving operation mode, and the heat source water supplied to these groups. The supply amount of heat and the output of the heat source water pump that supplies heat source water can be reliably reduced according to the air conditioning load.

  A pressure sensor is installed in the branch pipe of the end group where the heat source water supplied from the main pipe of the group last flows, and the pressure sensor measures the end differential pressure of the branch pipe of the end group and the measured end difference. The water heat source heat pump unit piping system that outputs the pressure to the control mechanism can reliably adjust the supply amount of the heat source water pump based on the terminal differential pressure pressure output from the pressure sensor in the energy saving operation mode. In addition to being able to reliably reduce the amount of heat source water supplied to these groups and the output of the heat source water pump that supplies the heat source water according to the air conditioning load, the pressure sensor detects the end differential pressure By doing so, it can be determined that the heat source water is surely flowing in the branch pipes of all groups.

The schematic block diagram of the water heat source heat pump unit piping system shown as an example. The figure explaining the switching timing of the normal operation mode and energy saving operation mode in the heat source water cooling operation, and the switching timing of the normal operation mode and energy saving operation mode in the heat source water heating operation. The figure which shows the relationship between the flow volume of the heat source water pump and apparatus resistance in normal operation mode and energy-saving operation mode. The schematic block diagram of the water heat source heat pump unit piping system shown as another example. The schematic block diagram of the water heat source heat pump unit piping system shown as another example. The schematic block diagram of the water heat source heat pump unit piping system shown as another example.

  The details of the water heat source heat pump unit piping system according to the present invention will be described below with reference to the accompanying drawings such as FIG. 1 which is a schematic configuration diagram of a water heat source heat pump unit piping system shown as an example. FIG. 2 is a diagram for explaining the timing of switching between the normal operation mode and the energy saving operation mode during the heat source water cooling operation and the timing of switching between the normal operation mode and the energy saving operation mode during the heat source water heating operation. FIG. 3 is a diagram showing the relationship between the flow rate of the heat source water pump 13 and the device resistance in the normal operation mode and the energy saving operation mode.

  FIG. 1 shows only the water heat source heat pump unit piping system 10 </ b> A installed inside the building, and the illustration of the building itself and each air-conditioning target room (each air-conditioned space) provided in the building is omitted. Although FIG. 1 illustrates a four-story building, the building hierarchy is not particularly limited. Moreover, there is no limitation in particular also about the number of each air-conditioning room provided in each floor of a building. Although a room is illustrated as an air-conditioned space, the air-conditioned space includes not only a room but also any air-conditioned space such as a hall, a floor, and a canteen that are created inside a building.

  The water heat source heat pump unit piping system 10A includes a cooling tower 11 (heat source water cooling device) (heat source water device) installed on the roof of a building, and a water heater 12 (heat source water heating device) installed on the ground (also possible on the roof). (Heat source device), heat source water pump 13 for sending out the heat source water, water heat source multi-type heat pump units 14a to 14d installed in each air conditioning target room on each floor, main pipe 15 and branch pipe 16 for circulating the heat source water, It has. The main pipe 15 is divided into a feed main pipe 15 a that sends the heat source water to the branch pipe 16 and a return main pipe 15 b that returns the heat source water to the cooling tower 11 and the water heater 12. The branch pipe 16 is divided into a feed branch pipe 16a that sends the heat source water to the units 14a to 14d, and a return branch pipe 16b that returns the heat source water to the main pipe 15b.

  In the water heat source heat pump unit piping system 10A, as shown in FIG. 1, air conditioning target groups 18 to 21 in which the water heat source multi-type heat pump units 14a to 14d installed on each floor are grouped are defined. In the building of FIG. 1, a first air conditioning target group 18 (hereinafter referred to as a first group) in which the units 14a on the first floor are grouped together, and a second air conditioning target group 19 (hereinafter referred to as a second group) in which the units 14b on the second floor are grouped together. ) A third air conditioning target group 20 (hereinafter referred to as the third group) in which the units 14c on the third floor are grouped together, and a fourth air conditioning target group 21 (hereinafter referred to as the fourth group) in which the units 14d on the fourth floor are grouped together. ing. In the system 10A of FIG. 1, groups 18 to 21 for each floor are created by dividing each floor of the building. However, the units 14a to 14d of each floor are divided for each floor and a plurality of groups are provided for each floor. May be made. For example, two or more groups may be created on the first floor by putting together a predetermined number of units 14a on the first floor.

  The cooling tower 11 can be a closed type. The cooling tower 11 is connected to the feed main pipe 15a and the return main pipe 15b, and cools the heat source water flowing therein by heat exchange with the outside air. A temperature indicating controller 22 is connected to the cooling tower 11, and a watering pump 23 is installed. A switching valve 24 is installed in the return main pipe 15 b extending in the vicinity of the cooling tower 11, and a temperature sensor 25 is installed in the feed main pipe 15 a extending in the vicinity of the cooling tower 11. In the vicinity of the cooling tower 11, a bypass pipe 26 that connects the return main pipe 15b and the return main pipe 15a is connected. A switching valve 27 is installed in the bypass pipe 26.

  During the heat source water cooling operation in the system 10A, the valve mechanism of the switching valve 27 is closed, the valve mechanism of the switching valve 24 is opened, and the heat source water flows into the cooling tower 11 from the return main pipe 15b. The cooled heat source water is cooled and flows out from the cooling tower 11 to the main pipe 15a. During the heat source water heating operation in the system 10A, the valve mechanism of the switching valve 24 is closed, the valve mechanism of the switching valve 27 is opened, and the heat source water flows from the return main pipe 15b to the feed main pipe 15a through the bypass pipe 26 and cooled. The inflow of heat source water to the tower 11 is stopped.

  The temperature sensor 25 is connected to the temperature indicating controller 22 via an interface, measures the temperature of the heat source water flowing in the feed main pipe 15a, and outputs the measured temperature to the temperature indicating controller 22. The temperature indicating controller 22 has an MPU and a memory, and adjusts the temperature of the heat source water flowing in the cooling tower 11 while sampling the temperature output from the temperature sensor 25 at a predetermined cycle. For example, during the heat source water cooling operation, when the temperature of the heat source water output from the temperature sensor 25 becomes lower than the set temperature range, the temperature indicating controller 22 stops the operation of the fan of the cooling tower 11 and conversely. When the temperature of the heat source water exceeds the set temperature range, the fan of the cooling tower 11 is operated again, the heat source water is cooled to a predetermined temperature via the cooling tower 11, and the cooled heat source water is fed into the main pipe 15a. .

  The hot water machine 12 is connected to the feed main pipe 15a and the return main pipe 15b. The hot water machine 12 has a combustion control mechanism, and heats the heat source water that has flowed there by the combustion heat of fuel (gas, oil, etc.). A temperature indicating controller 28 is connected to the water heater 12. A switching valve 29 is installed in the return main pipe 15 b extending in the vicinity of the hot water machine 12, and a temperature sensor 30 is installed in the feed main pipe 15 a extending in the vicinity of the hot water machine 12. A bypass pipe 31 that connects the return main pipe 15b and the return main pipe 15a is connected in the vicinity of the water heater 12. A switching valve 32 is installed in the bypass pipe 31. A hot heat source such as a heat exchanger can be used instead of the hot water machine 12.

  During the heat source water heating operation in the system 10A, the valve mechanism of the switching valve 32 is closed, the valve mechanism of the switching valve 29 is opened, the heat source water flows into the hot water machine 12 from the return main pipe 15b, and the heat source water is Heated and heated heat source water flows from the water heater 12 to the main pipe 15a. During the heat source water cooling operation in the system 10A, the valve mechanism of the switching valve 29 is closed, the valve mechanism of the switching valve 32 is opened, and the heat source water flows from the return main pipe 15b to the feed main pipe 15a through the bypass pipe 31. The inflow of heat source water to the machine 12 is stopped.

  The temperature sensor 30 is connected to the temperature indicating controller 28 via an interface, measures the temperature of the heat source water flowing in the feed main pipe 15a, and outputs the measured temperature to the temperature indicating controller 28. The temperature indicating controller 28 includes an MPU and a memory, and performs start / stop control (ON / OFF control) of the water heater 12 while sampling the temperature output from the temperature sensor 30 at a predetermined cycle. For example, during the heat source water heating operation, the temperature indicating controller 28 stops the water heater 12 when the temperature of the heat source water output from the temperature sensor 30 is higher than the set temperature range, and conversely, the heat source water. When the temperature becomes lower than the set temperature range, the water heater 12 is operated. The hot water machine 12 in operation heats the heat source water to a predetermined temperature by the combustion control mechanism, and flows the heated heat source water into the feed pipe 15a.

  The heat source water pump 13 is installed in the feed main pipe 15 a and supplies the heat source water cooled by the cooling tower 11 or the heat source water heated by the water heater 12 to the main pipe 15 and the branch pipe 16. An inverter device 68 (control mechanism) is connected to the heat source water pump 13 via an interface. The output (heat source water supply amount) of the heat source water pump 13 is changed by inverter control of the inverter device 68. The inverter device 68 is connected to the pressure indicating controller 33 (control mechanism) via an interface. A pressure sensor 34 is installed in the feed main pipe 15 a extending in the vicinity of the heat source water pump 13. The pressure sensor 34 is connected to the pressure indicating controller 33 via an interface, measures the pressure of the heat source water flowing through the feed main pipe 15 a, and outputs the measured pressure to the pressure indicating controller 33.

  The pressure indicating controller 33 has an MPU and a memory, samples the pressure output from the pressure sensor 34 at a predetermined cycle, and outputs a control signal to the inverter device 68 connected to the heat source water pump 13. The memory of the pressure indicating controller 33 stores the rated output (setting information) of the heat source water pump 13 when the system 10A is in the normal operation mode (normal flow rate). Further, the correlation between the flow rate of the heat source water flowing through the feed main pipe 15a and the pressure of the heat source water and the correlation between the pressure of the heat source water flowing through the feed main pipe 15a and the output of the heat source water pump 13 are stored.

  The water heat source multi-type heat pump units 14a to 14d are installed in the air conditioning target rooms of the first to fourth groups 18 to 21, respectively. These units 14 a to 14 d are connected to the branch pipe 16. The branch pipe 16 branches from the sending main pipe 15a for each of the groups 18 to 21 and extends to the air conditioning target rooms of the groups 18 to 21. These units 14 a to 14 d have a heat source water inflow pipe 35 connected to the feed branch pipe 16 a of the branch pipes 16 and a heat source water outflow pipe 36 connected to the return branch pipe 16 b of the branch pipes 16. The units 14a to 14d perform the cooling operation or the heating operation using the heat source water taken from the heat source water inflow pipe 35, and perform the air blowing operation.

  On the return branch pipe 16b of the first group 18 (return branch pipe 16b extending in the vicinity of the return main pipe 15b), a temperature sensor 37 for measuring the temperature of the heat source water flowing therethrough is installed. A temperature indicating controller 38 (control mechanism) is installed between the branch pipes 16 of the first and second groups 18 and 19. The return branch pipe 16b of the first group 18 (one group) and the feed branch pipe 16a of the second group 19 (the other group) have a bypass pipe 39 for flowing heat source water from the branch pipe 16b to the branch pipe 16a. It is connected.

  The bypass pipe 39 is connected to a return branch pipe 16b extending between the return main pipe 15b and the unit 14a located in the immediate vicinity of the main pipe 15b (connected to the vicinity of the return main pipe 16b), and the feed main pipe 15a and the main pipe 15a. Is connected to a feed branch pipe 16a extending between the unit 14b and the unit 14b located in the immediate vicinity (connected to the vicinity of the feed main pipe 15a). A switching valve 40 is installed in the bypass pipe 39. A switching valve 41 is installed in the return branch pipe 16b of the first group 18 extending between the return main pipe 15b and the bypass pipe 39. A switching valve 42 is installed in the feed branch pipe 16 a of the second group 19 extending between the feed main pipe 15 a and the bypass pipe 39.

  The temperature sensor 37 and the switching valves 40 to 42 are connected to the temperature indicating controller 38 via an interface. The temperature sensor 37 measures the temperature of the heat source water flowing through the return branch pipe 16 b and outputs the measured temperature to the temperature indicating controller 38. The temperature indicating controller 38 has an MPU and a memory, samples the temperature output from the temperature sensor 37 at a predetermined cycle, and executes ON / OFF control for the switching valves 40 to 42.

  In the return branch pipe 16b of the third group 20 (return branch pipe 16b extending in the vicinity of the return main pipe 15b), a temperature sensor 43 for measuring the temperature of the heat source water flowing therethrough is installed. A temperature indicating controller 44 (control mechanism) is installed between the branch pipes 16 of the third and fourth groups 20 and 21. The return branch pipe 16b of the third group 20 (one group) and the feed branch pipe 16a of the fourth group 21 (the other group) have a bypass pipe 45 that allows heat source water to flow from the branch pipe 16b to the branch pipe 16a. It is connected.

  The bypass pipe 45 is connected to a return branch pipe 16b extending between the return main pipe 15b and the unit 14c located in the immediate vicinity of the main pipe 15b (connected to the vicinity of the return main pipe 16b), and the feed main pipe 15a and the main pipe 15a. Is connected to a feed branch pipe 16b extending between the unit 14d and the unit 14d located in the immediate vicinity (connected to the vicinity of the feed main pipe 15a). A switching valve 46 is installed in the bypass pipe 45. A switching valve 47 is installed in the return branch pipe 16b of the third group 20 extending between the return main pipe 15b and the bypass pipe 45. A switching valve 48 is installed in the feed branch pipe 16 a of the fourth group 21 extending between the feed main pipe 15 a and the bypass pipe 45.

  The temperature sensor 43 and the switching valves 46 to 48 are connected to the temperature indicating controller 44 via an interface. The temperature sensor 43 measures the temperature of the heat source water flowing through the return branch pipe 16 b and outputs the measured temperature to the temperature indicating controller 44. The temperature indicating controller 44 includes an MPU and a memory, samples the temperature output from the temperature sensor 43 at a predetermined cycle, and executes ON / OFF control for the switching valves 46 to 48.

  Although not shown, these water heat source multi-type heat pump units 14a to 14d include a compressor, a four-way valve, an air side heat exchanger, an expansion valve, a heat source water side heat exchanger, and an air supply fan. The compressor can change its output (frequency) by inverter control. An inflow pipe and an outflow pipe are connected to the compressor. The inflow pipe causes the heat medium to flow into the compressor, and the outflow pipe causes the heat medium to flow out of the compressor. The air-side heat exchanger exchanges heat between the heat medium circulating through the units 14a to 14d and the outside air, and exchanges heat between the heat medium and room air. The heat source water side heat exchanger exchanges heat between the heat source water and the heat medium.

  In these units 14a-14d, a heat medium circulates through a compressor, an air side heat exchanger, an expansion valve, and a heat source water side heat exchanger to form a refrigeration cycle. In the cooling operation in the units 14a to 14d, a refrigeration cycle is performed in which the heat medium is evaporated by the air-side heat exchanger. In the heating operation in the units 14a to 14d, a refrigeration cycle is performed in which the heat medium is condensed by the air-side heat exchanger. In the air blowing operation of the units 14a to 14d, the compressor is stopped and the circulation of the heat medium is stopped, and the air-fuel mixture of the room air and the outside air is supplied into the room from the air supply port by the supply fan (patent) Reference 1).

  The memory of the temperature indicating controllers 38 and 44 stores the first set temperature of the heat source water that serves as a reference value for performing either the normal operation mode or the energy saving operation mode during the heat source water cooling operation, and during the heat source water heating operation. The second set temperature of the heat source water serving as a reference value for performing either the normal operation mode or the energy saving operation mode is stored. The first and second set temperatures can be freely changed.

  The temperature indicating controllers 38 and 44 compare the measured temperature of the heat source water output from the temperature sensors 37 and 43 with the first set temperature stored in the memory during the heat source water cooling operation. When the measured temperature is higher than the first set temperature as a result of comparing the measured temperature with the first set temperature, the temperature indicating controllers 38 and 44 perform the normal operation mode of the system 10A, and the measured temperature is the first set temperature. If it is lower, the energy saving operation mode of the system 10A is performed.

  The temperature indicating controllers 38 and 44 compare the measured temperature of the heat source water output from the temperature sensors 37 and 43 with the second set temperature stored in the memory during the heat source water heating operation. When the measured temperature is lower than the second set temperature as a result of comparing the measured temperature with the second set temperature, the temperature indicating controllers 38 and 44 perform the normal operation mode of the system 10A, and the measured temperature is the second set temperature. Is higher, the energy saving operation mode of the system 10A is performed.

  In the normal operation mode of the system 10A, the supply amount (output) of the heat source water pump 13 is maintained at the rated flow rate (rated output), and the heat source water supplied from the pump 13 is sent from the main pipe 15a to each air conditioning of the groups 18-21. The heat source water that flows into the feed branch pipe 16a extending to the target room and heat-exchanged in the units 14a to 14d of the groups 18 to 21 returns from the return branch pipe 16b extending to the air conditioning target rooms of the groups 18 to 21. It flows into the main pipe 15b.

  In the energy saving operation mode of the system 10A, the heat source water heat-exchanged in the units 14 and 14c of the first and third groups 18 and 20 is supplied to the second and fourth groups 19 and 21 via the bypass pipes 39 and 45, respectively. The heat energy of the heat source water flows into the units 14b and 14d and is reused in the units 14b and 14d of the second and fourth groups 19 and 21. As a result, the pressure of the heat source water flowing in the main pipe 15a increases, the inverter device 68 performs inverter control according to the instruction of the pressure indicating controller 33, and the supply amount (output) of the heat source water pump 13 is higher than the rated flow rate (rated output). The flow rate is also small.

  The normal operation mode and the energy saving operation mode during the heat source water cooling operation in the system 10A of FIG. 1 will be described as follows. In the heat source water cooling operation, the normal operation mode is first performed in the system 10A. In the heat source water cooling operation, the cooling tower 11 is operating and the water heater 12 is stopped, and each of the water heat source multi-type heat pump units 14a to 14d of the groups 18 to 21 is in any one of the cooling operation, the heating operation, and the air blowing operation. It is driven by. In the normal operation mode during the heat source water cooling operation, the heat source water is cooled by the cooling tower 11, the cooled heat source water is supplied by the heat source water pump 13, and the heat source water enters the feed branch pipe 16a through the feed main pipe 15a. To do.

  In the normal operation mode of the system 10A, the switching valves 41, 42, 47, and 48 are opened and the switching valves 40 and 46 are closed so that the heat source water does not flow into the bypass pipes 39 and 45. The temperature indicating controllers 38 and 44 open the valve mechanisms of the switching valves 41, 42, 47, and 48 and close the valve mechanisms of the switching valves 40 and 46.

  In the normal operation mode, the output (supply amount) of the heat source water pump 13 is maintained at the rated output (rated flow rate) (normal flow rate). The pressure of the heat source water passing through the feed main pipe 15 a is measured by the pressure sensor 34, and the measured pressure is output from the sensor 34 to the pressure indicating controller 33. The pressure indicating controller 33 applies the measured pressure to the correlation between the flow rate of the heat source water flowing through the feed main pipe 15a and the pressure of the heat source water, obtains the flow rate of the heat source water by the measured pressure, and the flow rate is the rated flow rate. Determine whether.

  Specifically, for example, when the flow rate of the heat source water flowing through each branch pipe 16 of the first to fourth groups 18 to 21 is 25 L / min, the supply amount of the heat source water pump 13 is 25 L / min × 4 100 L / Min. When 100 L / min is the rated flow rate, the pressure indicating controller 33 maintains the flow rate. When the flow rate is not the rated flow rate, the pressure indicating controller 33 controls the output of the heat source water pump 13 by the inverter device 68 and changes the output of the pump 13 in order to make the flow rate the minimum necessary flow rate.

  In the normal operation mode, the heat source water flows from the feed main pipe 15a to the feed branch pipes 16a of the groups 18 to 21, and flows from the feed branch pipe 16a to the heat source water inflow pipes 35 of the units 14a to 14d to the units 14a to 14d. Enter. The heat source water subjected to heat exchange in the units 14a to 14d flows into the heat source water outflow pipe 36 of the units 14a to 14d, and flows into the return main pipe 15b through the return branch pipe 16b. The heat source water that has flowed into the return main pipe 15b enters the cooling tower 11 from the return main pipe 15b, is cooled by the cooling tower 11, and flows into the feed main pipe 15a again.

  The temperature of the heat source water subjected to heat exchange in each of the units 14a to 14d is higher than that of the heat source water before entering the units 14a to 14d. The temperature of the heat source water flowing through the return branch pipe 16b is measured by the temperature sensors 37 and 43, and the measured temperature is output from the sensors 37 and 43 to the temperature indicating controllers 38 and 44.

  The temperature indicating controllers 38 and 44 compare the measured temperature of the heat source water with the first set temperature, and when the measured temperature is higher than the first set temperature as shown in FIG. 2, the normal operation mode of the system 10A is set. continue. In the normal operation mode, the heat source water flowing out from the units 14a to 14d and flowing into the return main pipe 15b enters the cooling tower 11 from the return main pipe 15b, is cooled by the cooling tower 11, and flows into the feed main pipe 15a again. To do. When the measured temperature becomes lower than the first set temperature, the temperature indicating controllers 38 and 44 switch from the normal operation mode to the energy saving operation mode. The first preset temperature is preferably set in the range of 25 ° C to 32 ° C.

  In the energy saving operation mode of the system 10A, the switching valves 40, 46 are opened and the switching valves 41, 42, 47, 48 are closed so that the heat source water flows through the bypass pipes 39, 45. The temperature indicating controllers 38 and 44 open the valve mechanisms of the switching valves 40 and 46 and close the valve mechanisms of the switching valves 41, 42, 47 and 48.

  In the energy saving operation mode, the heat source water flows from the feed main pipe 15a into the feed branch pipe 16a of the first group 18, and flows from the feed branch pipe 16a into the heat source water inflow pipe 35 of the units 14a of the first group 18. And flows into the feed branch pipe 15a of the third group 20 from the feed main pipe 15a, flows into the heat source water inflow pipe 35 of those units 14c of the third group 20 from the feed branch pipe 15a, and enters each unit 14c. .

  The heat source water heat-exchanged in the units 14a of the first group 18 flows into the heat source water outflow pipe 36 of the unit 14a, flows into the bypass pipe 39 through the return branch pipe 16b, and passes through the second group from the bypass pipe 39. It flows into 19 feed branch pipes 16a. Furthermore, it flows into the heat source water inflow pipe 35 of those units 14b of the second group 19 from the feed branch pipe 16a and enters each unit 14b. The heat source water heat-exchanged in the units 14b of the second group 19 flows into the heat source water outflow pipe 35 of the unit 14b, and flows into the return main pipe 15b through the return branch pipe 16b.

  The heat source water heat-exchanged in the units 14c of the third group 20 flows into the heat source water outflow pipe 36 of the unit 14c, flows into the bypass pipe 45 through the return branch pipe 16b, and passes through the fourth group from the bypass pipe 45. 21 flows into the feed branch pipe 16a. Furthermore, it flows into the heat source water inflow pipe 35 of those units 14d of the fourth group 21 from the feed branch pipe 16a and enters each unit 14d. The heat source water heat-exchanged in the units 14d of the fourth group 21 flows into the heat source water outflow pipe 35 of the unit 14d, and flows into the return main pipe 15b through the return branch pipe 16b.

  In the energy saving operation mode, the flow rate of the heat source water flowing in the branch pipes 16 of the first to fourth groups 18 to 21 is decreased, and as a result, the pressure of the heat source water flowing in the main pipe 15a is increased. After the measured pressure of the heat source water passing through the feed main pipe 15a is output from the sensor 34 to the pressure indicating controller 33, the pressure indicating controller 33 determines the pressure of the heat source water flowing in the feed main pipe 15a and the output of the heat source water pump 13 ( The measured pressure is applied to the correlation with the heat source water supply amount), the output of the heat source water pump 13 corresponding to the measured pressure is obtained, and the output of the pump 13 is obtained by controlling the pump 13 with the inverter device 68 by inverter control. Change to (less output than rated output). The heat source water supply amount of the heat source water pump 13 is maintained at a flow rate smaller than the rated flow rate (normal flow rate).

  Specifically, for example, when the flow rate of the heat source water flowing through the branch pipes 16 of the first to fourth groups 18 to 21 is 25 L / min, the first pipe 18 extends from the branch pipes 16 extending to the air-conditioning target chambers. By causing the heat source water to flow into the branch pipes 16 extending to the air conditioning target rooms of the two groups 19, the flow rate of the heat source water combined with the first group 18 and the second group 19 becomes 25 L / min. The flow rate of the heat source water combined with the third group 20 and the fourth group 21 is 25 L by allowing the heat source water to flow from the branch pipe 16 extending to the air conditioning target room to the branch pipe 16 extending to each air conditioning target room of the fourth group 21. / Min. Therefore, the supply amount of heat source water in the energy saving operation mode is 50 L / min, which is half that of the supply amount of heat source water in the normal operation mode of 100 L / min. The pressure indicating controller 33 controls the output of the heat source water pump 13 by the inverter device 68, and reduces the output of the pump 13 from 100% to N% as shown in FIG. Change from 100 L / min to 50 L / min and hold the supply.

  The temperature indicating controllers 38 and 44 compare the measured temperature of the heat source water with the first set temperature, and when the measured temperature is lower than the first set temperature, as shown in FIG. continue. In the energy saving operation mode, the heat source water flowing out from the units 14a to 14d and flowing into the return main pipe 15b enters the cooling tower 11 from the return main pipe 15b, is cooled by the cooling tower 11, and flows into the feed main pipe 15a again. When the measured temperature becomes higher than the first set temperature, the temperature indicating controllers 38 and 44 switch from the energy saving operation mode to the normal operation mode, and perform the above-described normal operation mode.

  Note that the energy saving operation mode can be performed in the first and second groups, and the normal operation mode can be performed in the third and fourth groups. Further, the energy saving operation mode can be performed in the third and fourth groups, and the normal operation mode can be performed in the first and second groups. When the energy saving operation mode is performed in the first and second groups and the normal operation mode is performed in the third and fourth groups, the flow rate of the heat source water combined with the first group 18 and the second group 19 is 25 L / min. The supply amount of heat source water in the energy saving operation mode is 75 L / min with respect to the supply amount of heat source water in the operation mode of 100 L / min. The pressure indicating controller 33 controls the output of the heat source water pump 13 by the inverter device 68, reduces the output of the pump 13 from 100% to N%, and the heat source water supply amount of the pump 13 from 100 L / min to 75 L / min. And keep the supply amount.

  When the temperature of the heat source water output from the temperature sensors 37 and 43 is lower than the first set temperature in the heat source water cooling operation of the system 10A, the water heat source heat pump unit piping system 10A executes the energy saving operation mode of the system 10A. In the energy saving operation mode, the heat source water heat-exchanged in the units 14a and 14c of the first and third groups 18 and 20 is transferred to the units 14b of the second and fourth groups 19 and 21 via the bypass pipes 39 and 45, respectively. , 14d and the heat energy of the heat source water is reused in the units 14b, 14d of the second and fourth groups 19, 21, so that the heat source water exchanged in the first and third groups 18, 20 is used. Without returning the main pipe 15b to the cooling tower 11, the heat energy of the heat source water is changed to the second and Each unit 14b of four groups 19, 21, 14d cooling operation and heating operation can be recycled to the blast operation.

  Next, the normal operation mode and the energy saving operation mode during the heat source water heating operation in the system 10A of FIG. 1 will be described. In the heat source water heating operation, the system 10A first performs the normal operation mode similarly to the heat source water cooling operation. In the heat source water heating operation, the water heater 12 is operated, the cooling tower 11 is stopped, and each of the water heat source multi-type heat pump units 14a to 14d of the groups 18 to 21 is in any one of the cooling operation, the heating operation, and the air blowing operation. It is driven by. In the normal operation mode during the heat source water heating operation, the heat source water is heated by the water heater 12, the heated heat source water is supplied by the heat source water pump 13, and the heat source water enters the feed branch pipe 16a through the feed main pipe 15a. To do.

  In the normal operation mode of the system 10A, the switching valves 41, 42, 47, and 48 are opened and the switching valves 40 and 46 are closed so that the heat source water does not flow into the bypass pipes 39 and 45. The temperature indicating controllers 38 and 44 open the valve mechanisms of the switching valves 41, 42, 47, and 48 and close the valve mechanisms of the switching valves 40 and 46. In the normal operation mode, the output (supply amount) of the heat source water pump 13 is maintained at the rated output (rated flow rate) (normal flow rate). The measured pressure of the heat source water passing through the feed main pipe 15 a is output from the sensor 34 to the pressure indicating controller 33. The pressure indicating controller 33 obtains the flow rate of the heat source water based on the measured pressure as in the heat source water cooling operation, and determines whether the flow rate is the rated flow rate. When the flow rate is the rated flow rate, the pressure indicating controller 33 holds the flow rate. When the flow rate is not the rated flow rate, the pressure indicating controller 33 controls the output of the heat source water pump 13 by the inverter device 68 and changes the output of the pump 13 in order to make the flow rate the minimum necessary flow rate.

  Since the flow path of the heat source water in the normal operation mode is the same as that in the normal operation mode during the heat source water cooling operation, the description thereof is omitted. The temperature of the heat source water subjected to heat exchange in each unit 14a to 14d is lower than that of the heat source water before entering the units 14a to 14d. The temperature of the heat source water flowing through the return branch pipe 16b is measured by the temperature sensors 37 and 43, and the measured temperature is output from the sensors 37 and 43 to the temperature indicating controllers 38 and 44.

  The temperature indicating controllers 38 and 44 compare the measured temperature of the heat source water with the second set temperature, and when the measured temperature is lower than the second set temperature as shown in FIG. 2, the normal operation mode of the system 10A is set. continue. In the normal operation mode, the heat source water flowing out from the units 14a to 14d and flowing into the return main pipe 15b enters the hot water machine 12 from the return main pipe 15b, is heated by the hot water machine 12, and flows into the feed main pipe 15a again. To do. When the measured temperature becomes higher than the second set temperature, the temperature indicating controllers 38 and 44 switch from the normal operation mode to the energy saving operation mode. It is preferable to set 2nd preset temperature in the range of 35 to 45 degreeC.

  In the energy saving operation mode of the system 10A, the switching valves 40, 46 are opened and the switching valves 41, 42, 47, 48 are closed so that the heat source water flows through the bypass pipes 39, 45. The temperature indicating controllers 38 and 44 open the valve mechanisms of the switching valves 40 and 46 and close the valve mechanisms of the switching valves 41, 42, 47 and 48. Since the flow path of the heat source water in the energy saving operation mode is the same as that of the energy saving operation mode in the heat source water cooling operation, the description thereof is omitted.

  In the energy saving operation mode, after the pressure of the heat source water passing through the feed main pipe 15a is output from the sensor 34 to the pressure indication controller 33, the pressure indication controller 33 is placed in the feed main pipe 15a in the same manner as in the heat source water cooling operation. The measurement pressure is applied to the correlation between the pressure of the flowing heat source water and the output (heat source water supply amount) of the heat source water pump 13, the output of the heat source water pump 13 corresponding to the measurement pressure is obtained, and the pump 13 is connected to the inverter device 68. The output of the pump 13 is obtained by controlling the inverter to change to the output obtained (the output less than the rated output). The heat source water supply amount of the heat source water pump 13 is maintained at a flow rate smaller than the rated flow rate (normal flow rate). For example, when the supply amount of the heat source water in the normal operation mode is 100 L / min, the pressure indicating controller 33 changes the output of the pump 13 by controlling the heat source water pump 13 by the inverter device 68 and changing the output of the pump 13. The heat source water supply amount is changed from 100 L / min to 50 L / min and the supply amount is maintained.

  The temperature indicating controllers 38 and 44 compare the measured temperature of the heat source water with the second set temperature, and when the measured temperature is higher than the second set temperature as shown in FIG. continue. In the energy saving operation mode, the heat source water flowing out from each unit 14a to 14d and flowing into the return main pipe 15b enters the hot water machine 12 from the return main pipe 15b, is heated by the hot water machine 12, and flows into the feed main pipe 15a again. When the measured temperature becomes lower than the second set temperature, the temperature indicating controllers 38 and 44 switch from the energy saving operation mode to the normal operation mode and perform the above-described normal operation mode.

  In the heat source water heating operation of the system 10A, the system 10A executes the energy saving operation mode of the system 10A when the temperature of the heat source water output from the temperature sensors 37 and 43 is higher than the second set temperature, and in the energy saving operation mode. The heat source water heat-exchanged in the units 14a and 14c of the first and third groups 18 and 20 is caused to flow into the units 14b and 14d of the second and fourth groups 19 and 21 through the bypass pipes 39 and 45. Since the heat energy of the heat source water is reused in the units 14b and 14d of the second and fourth groups 19 and 21, the heat source water heat-exchanged in the first and third groups 18 and 20 is returned from the main pipe 15b. Without returning to the water heater 12, the heat energy of the heat source water is changed to each unit of the second and fourth groups 19, 21. Door 14b, 14d cooling operation or a heating operation, it is possible to re-use the fan operation.

  In the energy saving operation mode, the system 10A causes the heat source water exchanged in the units 14a and 14c of the first and third groups 18 and 20 to flow into the units 14b and 14d of the second and fourth groups 19 and 21. Therefore, compared with the case where the heat source water is supplied for each of the groups 18 to 21 in the normal operation mode, the supply amount of the heat source water can be halved, and the supply amount of the heat source water supplied to the groups 18 to 21 is reduced. Decrease. As a result, the supply amount of the heat source water supplied from the heat source water pump 13 becomes smaller than the rated flow rate (normal flow rate), and the output of the heat source water pump 13 can be reduced accordingly. The system 10A can reduce the power of the heat source water pump while maintaining the functions of the water heat source heat pump units 14a to 14d installed in the groups 18 to 21, thereby achieving energy saving of the entire system 10A. Can do.

  FIG. 4 is a schematic configuration diagram of a water heat source heat pump unit piping system 10B shown as another example. This system 10B differs from that of FIG. 1 in that the bypass 65 is connected to the feed main pipe 15a and the return main pipe 15b, and the pressure sensor 66 is installed in the branch pipe 16 of the end group (fourth group 21). There is in point. Cooling tower 11 (heat source water cooling device) (heat source device) and water heater 12 (heat source water heating device) (heat source device), heat source water pump 13, water heat source multi-type heat pump units 14a to 14d, main pipe 15 and Since the branch pipe 16, the pressure indicating controller 33 (control mechanism), and the temperature indicating controller 38 (control mechanism) are the same as those of the system 10A in FIG. 1, the same reference numerals as those in FIG. By using the description, those descriptions in the system 10B are omitted.

  The memory of the pressure indicating controller 33 stores the rated output (setting information) of the heat source water pump 13 when the system 10A is in the normal operation mode (normal flow rate). Further, there is a correlation between the flow rate of the heat source water flowing in the feed main pipe 15a and the pressure of the heat source water, and a correlation between the pressure of the heat source water flowing in the feed main pipe 15a and the output of the heat source water pump 13 (heat source water supply amount). Stored. Furthermore, the correlation between the pressure of the heat source water flowing in the branch pipe 16 and the output (heat source water supply amount) of the heat source water pump 13 is stored. The memory of the temperature indicating controller 38 stores the first set temperature of the heat source water that serves as a reference value for performing either the normal operation mode or the energy saving operation mode during the heat source water cooling operation, and the normal temperature during the heat source water heating operation is stored. The second set temperature of the heat source water serving as a reference value for performing either the operation mode or the energy saving operation mode is stored.

  In the building of FIG. 4, a first group 18 in which the water heat source multi-type heat pump units 14 a on the first floor are grouped together, a second group 19 in which the units 14 b on the second floor are grouped together, and a unit 14 c on the third floor in a group third group. A fourth group 21 is created by grouping the groups 20 and the units 14d on the fourth floor. In this system 10B, the first and second groups 18, 19 are one group, and the third and fourth groups 20, 21 are the other group.

  The return main pipe 15b extending between the second group 19 and the third group 20 (return main pipe 15b extending between one group and the other group) has a temperature sensor 37 for measuring the temperature of the heat source water flowing therethrough. And a temperature indicating controller 38 are installed. A bypass pipe 65 that allows heat source water to flow from the main pipe 15b to the main pipe 15a is connected to the feed main pipe 15a extending between the second group 19 and the third group 20 and the return main pipe 15b extending between the groups 19 and 20. Has been.

  A switching valve 40 is installed in the bypass pipe 65. A switching valve 41 is installed in the feed main pipe 15 a extending between the second group 19 and the third group 20 and upstream of the bypass pipe 65. A switching valve 42 is installed in the return main pipe 15b extending between the second group 19 and the third group 20 and downstream of the bypass pipe 65. The temperature sensor 37 and the switching valves 40 to 42 are connected to the temperature indicating controller 38 via an interface. The temperature sensor 37 measures the temperature of the heat source water flowing through the return main pipe 15 b and outputs the measured temperature to the temperature indicating controller 38.

  The pressure sensor 66 is the branch pipe 16 of the fourth group 21 which is the end group through which the heat source water supplied from the feed main pipe 15a of the first to fourth groups 19 to 21 finally flows, and is included in the unit 14d. It is located after it located at the end of. The pressure sensor 66 is connected to the pressure indicating controller 33 via an interface. The pressure sensor 66 measures the terminal differential pressure of the branch pipe 16 of the fourth group 21 (terminal group), and outputs the terminal differential pressure to the pressure indicating controller 33.

  The normal operation mode and the energy saving operation mode during the heat source water cooling operation in the system 10B of FIG. 4 will be described as follows. In the heat source water cooling operation, in the system 10B, the normal operation mode is first performed as in the system 10A of FIG. In the heat source water cooling operation, the cooling tower 11 is operating and the water heater 12 is stopped, and each of the water heat source multi-type heat pump units 14a to 14d of the groups 18 to 21 is in any one of the cooling operation, the heating operation, and the air blowing operation. It is driven by. In the normal operation mode during the heat source water cooling operation, the heat source water is cooled by the cooling tower 11, the cooled heat source water is supplied by the heat source water pump 13, and the heat source water enters the feed branch pipe 16a through the feed main pipe 15a. To do.

  In the normal operation mode of the system 10B, the switching valves 41 and 42 are opened and the switching valve 40 is closed so that the heat source water is not returned and does not flow from the main pipe 15b to the feed main pipe 15a. The temperature indicating controller 38 opens the valve mechanism of the switching valves 41 and 42 and closes the valve mechanism of the switching valve 40.

  In the normal operation mode, the output (supply amount) of the heat source water pump 13 is maintained at the rated output (rated flow rate) (normal flow rate). The pressure of the heat source water passing through the branch pipe 16 is measured by the pressure sensor 66, and the measured pressure is output from the sensor 66 to the pressure indicating controller 33. The pressure indicating controller 33 applies the measurement pressure to the correlation between the flow rate of the heat source water flowing through the branch pipe 16 and the pressure of the heat source water, obtains the flow rate of the heat source water by the measurement pressure, and the flow rate is the rated flow rate. Determine whether. For example, when the flow rate of the heat source water flowing in each branch pipe 16 of the first to fourth groups 18 to 21 is 25 L / min, the controller 17 sets the supply amount of the heat source water pump 13 to 100 L / 25 × 25 L / min × 4. Hold at min (rated flow rate). When the flow rate is not the rated flow rate, the pressure indicating controller 33 controls the output of the heat source water pump 13 by the inverter device 68 and changes the output of the pump 13 in order to make the flow rate the minimum necessary flow rate.

  Since the flow path of the heat source water in the normal operation mode of the system 10B is the same as that in the normal operation mode at the time of the heat source water cooling operation of the system 10A in FIG. 1, by using the description of the system 10A in FIG. The description is omitted. After the temperature of the heat source water flowing through the return main pipe 15b is measured by the temperature sensor 37 and the measured temperature is output from the sensor 37 to the temperature indicating controller 38, the temperature indicating controller 38 determines the first temperature of the heat source water and the first temperature. When the measured temperature is higher than the first set temperature when compared with the set temperature, the normal operation mode of the system 10B is continued (in FIG. 2). In the normal operation mode, the heat source water flowing out from the units 14a to 14d and flowing into the return main pipe 15b enters the cooling tower 11 from the return main pipe 15b, is cooled by the cooling tower 11, and flows into the feed main pipe 15a again. When the measured temperature becomes lower than the first set temperature, the temperature indicating controller 38 switches from the normal operation mode to the energy saving operation mode.

  In the energy saving operation mode of the system 10B, the switching valve 40 is opened and the switching valves 41 and 42 are closed so that the heat source water flows through the bypass pipe 39. The temperature indicating controller 38 opens the valve mechanism of the switching valve 40 and closes the valve mechanisms of the switching valves 41 and 42.

  In the energy saving operation mode, the heat source water flows into the feed branch pipe 16a of the first group 18 from the feed main pipe 15a, flows into the heat source water inflow pipe 35 of the units 14a from the feed branch pipe 16a, and enters each unit 14a. It flows into the feed branch pipe 15a of the second group 19 from the feed main pipe 15a, flows into the heat source water inflow pipe 35 of those units 14b from the feed branch pipe 15a, and enters each unit 14b.

  The heat source water heat-exchanged in the units 14a of the first group 18 flows into the heat source water outflow pipe 36 of the unit 14a, flows into the return main pipe 15b through the return branch pipe 16b, and those units of the second group 19 The heat source water heat-exchanged in 14b flows into the heat source water outflow pipe 36 of the unit 14b, and flows into the return main pipe 15b through the return branch pipe 16b.

  The heat source water flowing out from the units 14a and 14b of the first and second groups and flowing into the return main pipe 16b flows into the bypass pipe 39 and extends between the second group 19 and the third group 20 from the bypass pipe 39. It flows into the feed main pipe 15a. The heat source water flowing into the feed main pipe 15a from the bypass pipe 39 flows into the feed branch pipe 16a of the third group 20 from the feed main pipe 15a, and flows into the heat source water inflow pipe 35 of these units 14c from the feed branch pipe 16a. 14c, and flows into the feed branch pipe 15a of the fourth group 21 from the feed main pipe 15a, flows into the heat source water inflow pipe 35 of the unit 14d from the feed branch pipe 15a, and enters each unit 14d.

  The heat source water subjected to heat exchange in the units 14c of the third group 20 flows into the heat source water outflow pipe 36 of the unit 14c, flows into the return main pipe 15b through the return branch pipe 16b, and those units of the fourth group 21. The heat source water heat-exchanged in 14d flows into the heat source water outflow pipe 36 of the unit 14d, and flows into the return main pipe 15b through the return branch pipe 16b.

  In the energy saving operation mode, the flow rate of the heat source water flowing in the branch pipes 16 of the first to fourth groups 18 to 21 is decreased, and as a result, the pressure of the heat source water flowing in the branch pipes 16 is increased. After the measured pressure of the heat source water passing through the branch pipe 16 is output from the pressure sensor 66 to the pressure indicating controller 33, the pressure indicating controller 33 outputs the pressure of the heat source water flowing in the branch pipe 16 and the output of the heat source water pump 13. The measured pressure was applied to the correlation with the (heat source water supply amount), the output of the heat source water pump 13 corresponding to the measured pressure was obtained, and the pump 13 was inverter controlled by the inverter device 68 to obtain the output of the pump 13. Change to output (output less than rated output). The heat source water supply amount of the heat source water pump 13 is maintained at a flow rate smaller than the rated flow rate (normal flow rate).

  For example, when the flow rate of the heat source water flowing through the branch pipes 16 of the first to fourth groups 18 to 21 is 25 L / min, the first through the branch pipes 16 extending to the air-conditioning target chambers of the first and second groups 18 and 19 are used. The heat source combined with the first and second groups 18 and 19 and the third and fourth groups 20 and 21 by flowing heat source water into the branch pipes 16 extending to the air conditioning target rooms of the third and fourth groups 20 and 21 The flow rate of water is 50 L / min. Therefore, the supply amount of heat source water in the energy saving operation mode is 50 L / min, which is half that of the supply amount of heat source water in the normal operation mode of 100 L / min. The pressure indicating controller 33 controls the output of the heat source water pump 13 by the inverter device 68, reduces the output of the pump 13 from 100% to N%, and reduces the heat source water supply amount of the pump 13 from 100 L / min to 50 L / min. And the supply amount is maintained (incorporated in FIG. 3).

  The temperature indicating controller 38 compares the measured temperature of the heat source water with the first set temperature, and when the measured temperature is lower than the first set temperature, continues the energy saving operation mode of the system 10A (in FIG. 2). In the energy saving operation mode, the heat source water flowing out from the units 14a to 14d and flowing into the return main pipe 15b enters the cooling tower 11 from the return main pipe 15b, is cooled by the cooling tower 11, and flows into the feed main pipe 15a again. When the measured temperature becomes higher than the first set temperature, the temperature indicating controller 38 switches from the energy saving operation mode to the normal operation mode and performs the above-described normal operation mode.

  Next, the normal operation mode and the energy saving operation mode during the heat source water heating operation in the system 10B of FIG. 4 will be described. In the heat source water heating operation, the system 10B first performs the normal operation mode similarly to the heat source water cooling operation. In the heat source water heating operation, the water heater 12 is operated, the cooling tower 11 is stopped, and each of the water heat source multi-type heat pump units 14a to 14d of the groups 18 to 21 is in any one of the cooling operation, the heating operation, and the air blowing operation. It is driven by. In the normal operation mode during the heat source water heating operation, the heat source water is heated by the boiler 12, the heated heat source water is supplied by the heat source water pump 13, and the heat source water enters the feed branch pipe 16a through the feed main pipe 15a. .

  In the normal operation mode of the system 10B, the switching valves 41 and 42 are opened and the switching valve 40 is closed so that the heat source water does not flow into the bypass pipe 39. The temperature indicating controller 38 opens the valve mechanism of the switching valves 41 and 42 and closes the valve mechanism of the switching valve 40. In the normal operation mode, the output (supply amount) of the heat source water pump 13 is maintained at the rated flow rate. The measured pressure of the heat source water passing through the feed main pipe 15 a is output from the sensor 34 to the pressure indicating controller 33. The pressure indicating controller 33 obtains the flow rate of the heat source water based on the measured pressure as in the heat source water cooling operation, and determines whether the flow rate is the rated flow rate. When the flow rate is the rated flow rate, the pressure indicating controller 33 holds the flow rate.

  Since the flow path of the heat source water in the normal operation mode of the system 10B is the same as that in the normal operation mode during the heat source water cooling operation, the description thereof is omitted. The temperature of the heat source water subjected to heat exchange in each unit 14a to 14d is lower than that of the heat source water before entering the units 14a to 14d. The temperature of the heat source water flowing through the return branch pipe 16 b is measured by the temperature sensor 37, and the measured temperature is output from the sensor 37 to the temperature indicating controller 38.

  The temperature indicating controller 38 compares the measured temperature of the heat source water with the second set temperature, and continues the normal operation mode of the system 10B when the measured temperature is lower than the second set temperature (in FIG. 2). In the normal operation mode, the heat source water flowing out from the units 14a to 14d and flowing into the return main pipe 15b enters the hot water machine 12 from the return main pipe 15b, is heated by the hot water machine 12, and flows into the feed main pipe 15a again. When the measured temperature becomes higher than the second set temperature, the temperature indicating controller 38 switches from the normal operation mode to the energy saving operation mode.

  In the energy saving operation mode of the system 10A, the switching valve 40 is opened and the switching valves 41 and 42 are closed so that the heat source water flows through the bypass pipe 39. The temperature indicating controller 38 opens the valve mechanism of the switching valve 40 and closes the valve mechanisms of the switching valves 41 and 42. Since the distribution path of the heat source water in the energy saving operation mode of the system 10B is the same as that in the energy saving operation mode during the heat source water cooling operation, the description thereof is omitted.

  In the energy saving operation mode, after the measured pressure of the heat source water passing through the branch pipe 16 is output from the sensor 66 to the pressure indicating controller 33, the pressure indicating controller 33 is in the branch pipe 16 as in the heat source water cooling operation. The measured pressure is applied to the correlation between the pressure of the heat source water flowing in the heat source and the output (heat source water supply amount) of the heat source water pump 13, the output of the heat source water pump 13 corresponding to the measured pressure is obtained, and the pump 13 is connected to the inverter device. The output of the pump 13 is obtained by inverter control by 68 (the output is smaller than the rated output). The heat source water supply amount of the heat source water pump 13 is maintained at a flow rate smaller than the rated flow rate (normal flow rate). For example, when the supply amount of the heat source water in the normal operation mode is 100 L / min, the pressure indicating controller 33 changes the output of the pump 13 by controlling the heat source water pump 13 by the inverter device 68 and changing the output of the pump 13. The heat source water supply amount is changed from 100 L / min to 50 L / min and the supply amount is maintained.

  The temperature indicating controller 38 compares the measured temperature of the heat source water with the second set temperature, and when the measured temperature is higher than the second set temperature, continues the energy-saving operation mode of the system 10B (supported in FIG. 2). When the measured temperature becomes lower than the second set temperature, the temperature indicating controller 38 switches from the energy saving operation mode to the normal operation mode, and performs the above-described normal operation mode.

  When the temperature of the heat source water output from the temperature sensor 37 is lower than the first set temperature in the heat source water cooling operation of the system 10B, the water heat source heat pump unit piping system 10B executes the energy saving operation mode of the system 10B to save energy. In the operation mode, the heat source water exchanged in the units 14a and 14b of the first and second groups 18 and 19 flows into the units 14c and 14d of the third and fourth groups 20 and 21 via the bypass pipe 39. Since the heat energy of the heat source water is reused in the units 14c and 14d of the third and fourth groups 20 and 21, the heat source water heat-exchanged in the first and second groups 18 and 19 is returned to the main pipe 15b. Without returning to the cooling tower 11, the heat energy of the heat source water is transferred to the third and fourth groups. Each unit 14c of 0, 21, 14d cooling operation and heating operation can be recycled to the blast operation.

  When the temperature of the heat source water output from the temperature sensor 37 is higher than the second set temperature in the heat source water heating operation of the system 10B, the system 10B executes the energy saving operation mode of the system 10B. The heat source water heat-exchanged in the units 14a and 14b of the first and second groups 18 and 19 is caused to flow into the units 14c and 14d of the third and fourth groups 20 and 21 through the bypass pipe 39, and the heat source water Is used again in each of the units 14c and 14d of the third and fourth groups 20 and 21, the heat source water heat-exchanged in the first and second groups 18 and 19 is returned to the water heater 12 from the main pipe 15b. Without returning the heat energy of the heat source water, each unit 14c of the third and fourth groups 20, 21 4d cooling operation or a heating operation, it is possible to re-use the fan operation.

  In the energy saving operation mode, the system 10B causes the heat source water exchanged in the units 14a and 14b of the first and second groups 18 and 19 to flow into the units 14c and 14d of the third and fourth groups 20 and 21, respectively. Therefore, compared with the case where the heat source water is supplied for each of the groups 18 to 21 in the normal operation mode, the supply amount of the heat source water can be halved, and the supply amount of the heat source water supplied to the groups 18 to 21 is reduced. Decrease. As a result, the supply amount of the heat source water supplied from the heat source water pump 13 becomes smaller than the rated flow rate (normal flow rate), and the output of the heat source water pump 13 can be reduced accordingly. The system 10B can reduce the power of the heat source water pump while maintaining the functions of the water heat source heat pump units 14a to 14d installed in the groups 18 to 21, thereby achieving energy saving of the entire system 10B. Can do.

  In the system 10B, a pressure sensor 66 is installed in the branch pipe 16 of the fourth group 21 which is the end group through which the heat source water flows last, and the pressure sensor 66 indicates the end differential pressure of the branch pipe 16 of the fourth group 21. Since the pressure sensor 66 outputs the pressure to the controller 33, it can be determined that the heat source water is surely flowing in the branch pipes 16 of all the groups 18 to 21 by detecting the terminal differential pressure.

  FIG. 5 is a schematic configuration diagram of a water heat source heat pump unit piping system 10C shown as another example. In FIG. 5, only the first and second groups 18 and 19 are shown, and the third and fourth groups 20 and 21, the cooling tower 11, the water heater 12, and the heat source water pump 13 are not shown. The system 10C of FIG. 5 differs from that of FIG. 1 in that the number of water heat source multi-type heat pump units 14a installed in the first group 18 (one group) is four, whereas the second group 19 (the other group The number of units 14b installed in the group), the point where the flow compensation valve 67 (flow compensation mechanism) is installed, and the return branch 16b (return branch extending in the vicinity of the return main pipe 15b) of the second group 19 The temperature sensor 37 is installed in the pipe 16b).

  Cooling tower 11 (heat source water cooling device) (heat source device), water heater 12 (heat source water heating device) (heat source device), heat source water pump 13, water heat source multi-type heat pump units 14a to 14d, main pipe 15 and The branch pipe 16, the pressure indicating controller 33 (control mechanism), and the temperature indicating controllers 38 and 44 (control mechanism) are the same as those of the system 10A of FIG. Further, the normal operation mode and the energy saving operation mode during the heat source water cooling operation, the normal operation mode and the energy saving operation mode during the heat source water heating operation are the same as those of the system 10A in FIG. 1, and the heat source water in the normal operation mode is used. The distribution path and the distribution path of the heat source water in the energy saving operation mode are the same as those of the system 10A in FIG.

  In this system 10C, a flow compensation valve 67 is installed at the end of the branch pipe of the second group 19 (after that located at the end of the unit 14d). The flow compensation valve 67 is connected to the temperature indicating controller 38 through an interface. The flow rate compensation valve 67 has the same flow rate of the heat source water flowing through the feed branch pipe 15a and the return branch pipe 15b of the first group 18 as that of the heat source water flowing through the feed branch pipe 15a and the return branch pipe 15b of the second group 19. To be installed.

  For example, when the flow rate of the heat source water flowing through the branch pipe 16 of the first group 18 is 20 L / min at 4 × 5 L / min as 5 L / min per unit, the number of units 14 b of the second group 19 is three. The flow rate of the heat source water flowing through the branch pipes 16 of the second group 19 is 3 × 5 L / min, which is 15 L / min. If the flow rates of the heat source water flowing through the branch pipes 16 of the groups 18 and 19 are different, the heat source water heat-exchanged in the units 14a of the first group 18 is transferred to the units 14b of the second group 19 via the bypass pipe 39. When flowed in, the flow rate of the heat source water flowing through the branch pipe 16 of the first group 18 is affected by the second group 19, and the required amount of water of each unit 14a cannot be secured 20 L / min. The unit 14a has an excessively low flow rate, and each unit 14a generates a trouble such as a high pressure cut. Therefore, by installing a flow rate compensation valve 67 and flowing 5 L / min of heat source water through the flow rate compensation valve 67, the flow rate of the heat source water flowing in the feed branch pipe 15a and the return branch pipe 15b of the first group 18 and the second group. The flow rates of the heat source water flowing through the 19 feed branch pipes 15a and the return branch pipe 15b are made the same, thereby preventing troubles caused by an excessive flow rate of each unit 14a.

  This system 10C has the following effects in addition to the effects of FIG. In the system 10C, the flow rate of the heat source water flowing through the branch pipes 16 of the first and second groups 18 and 19 is equalized by the flow compensation valve 67, so that the heat source water subjected to heat exchange in each unit 14a of the first group 18 is used. When flowing into each unit 14b of the second group 19 via the bypass pipe 39, the supply amount of the heat source water can be halved at the maximum, and the supply amount of the heat source water supplied to the groups 18, 19 In addition, the output of the heat source water pump 13 that supplies the heat source water can be reliably reduced.

  FIG. 6 is a schematic configuration diagram of a water heat source heat pump unit piping system 10D shown as another example. The system 10D is different from that shown in FIG. 1 in that the pressure indicating controller 33 and the temperature indicating controllers 38 and 44 are not installed, and the controller 17 (control mechanism) is used instead of these controllers 33, 38, and 44. It is in the point where it is installed. Cooling tower 11 (heat source water cooling device) (heat source device), water heater 12 (heat source water heating device) (heat source device), heat source water pump 13, water heat source multi-type heat pump units 14a to 14d, main pipe 15 and Since the branch pipes 16 are the same as those in the system 10A of FIG. 1, the same reference numerals as those in FIG. 1 are used, and the description of FIG.

  The controller 17 is a computer having a central processing unit (CPU or MPU) and a storage unit. An input / output device (not shown) such as a keyboard, a numeric keypad unit, a display, and a printer is connected to the controller 17 via an interface, and the heat source water pump 13, temperature sensors 37 and 43, and switching valves 40 to 42 and 46 to 48 are connected via an interface. The controller 17 samples the pressure output from the pressure sensor 34 at a predetermined cycle, samples the temperature output from the temperature sensors 37 and 43 at a predetermined cycle, and outputs the pressure to the switching valves 40 to 42 and 46 to 48. The control signal is output to the inverter device 68 connected to the heat source water pump 13 while executing the ON / OFF control.

  The storage unit of the controller 17 stores a first set temperature of the heat source water that is a reference value for performing either the normal operation mode or the energy saving operation mode during the heat source water cooling operation, and the normal operation mode during the heat source water heating operation. The second set temperature of the heat source water serving as a reference value for performing either the energy saving operation mode or the energy saving operation mode is stored. The storage unit of the controller 17 stores the rated output (setting information) of the heat source water pump 13 in the normal operation mode (normal flow rate) of the system 10D. Further, the correlation between the flow rate of the heat source water flowing in the feed main pipe 15a and the pressure of the heat source water, and the correlation between the pressure of the heat source water flowing in the feed main pipe 15a and the output (heat source water supply amount) of the heat source water pump 13 are stored. Has been. The first and second set temperatures can be freely changed by the input device.

  The central processing unit of the controller 17 compares the measured temperature of the heat source water output from the temperature sensors 37 and 43 with the first set temperature stored in the storage unit during the heat source water cooling operation of the system 10D. As a result of comparing the measured temperature with the first set temperature, the central processing unit of the controller 17 performs the normal operation mode of the system 10A when the measured temperature is higher than the first set temperature, and the measured temperature is higher than the first set temperature. Is also low, the energy saving operation mode of the system 10A is performed.

  The central processing unit of the controller 17 compares the measured temperature of the heat source water output from the temperature sensors 37 and 43 with the second set temperature stored in the storage unit during the heat source water heating operation of the system 10D. When the measured temperature is lower than the second set temperature as a result of comparing the measured temperature with the second set temperature, the central processing unit of the controller 17 performs the normal operation mode of the system 10A, and the measured temperature is lower than the second set temperature. Is higher, the energy saving operation mode of the system 10A is performed. The distribution path of the heat source water in the normal operation mode of the system 10D and the distribution path of the heat source water in the energy saving operation mode are the same as those of the system 10A in FIG.

  In the normal operation mode of the system 10D, the controller 17 opens the valve mechanisms of the switching valves 41, 42, 47, and 48, closes the valve mechanisms of the switching valves 40 and 46, and supplies the heat source water pump 13 (output). ) At the rated flow rate (rated output). The pressure of the heat source water passing through the feed main pipe 15 a is measured by the pressure sensor 34, and the measured pressure is output from the sensor 34 to the controller 17. The controller 17 applies the measured pressure to the correlation between the flow rate of the heat source water flowing through the feed main pipe 15a and the pressure of the heat source water, obtains the flow rate of the heat source water based on the measured pressure, and determines whether the flow rate is the rated flow rate. To do. When the flow rate is not the rated flow rate, the controller 17 controls the output of the heat source water pump 13 by the inverter device 68 and changes the output of the pump 13 in order to make the flow rate the minimum necessary flow rate.

  In the energy saving operation mode of the system 10D, the controller 17 opens the valve mechanisms of the switching valves 40, 46 and closes the valve mechanisms of the switching valves 41, 42, 47, 48. In the energy saving operation mode, the flow rate of the heat source water flowing in the branch pipes 16 of the first to fourth groups 18 to 21 is decreased, and as a result, the pressure of the heat source water flowing in the main pipe 15a is increased. After the measured pressure of the heat source water passing through the feed main pipe 15a is output from the sensor 34 to the controller 17, the controller 17 calculates the pressure of the heat source water flowing in the feed main pipe 15a and the output of the heat source water pump 13 (heat source water supply amount). The output of the heat source water pump 13 corresponding to the measured pressure is obtained by applying the measured pressure to the correlation, and the output of the pump 13 is obtained by controlling the pump 13 with the inverter device 68 by the inverter device 68 (less than the rated output). Output). The heat source water supply amount of the heat source water pump 13 is maintained at a flow rate smaller than the rated flow rate (normal flow rate).

  This system 10D has the following effects in addition to those of FIG. In the system 10D, a controller 17 is installed in place of the pressure indicating controller 33 and the temperature indicating controllers 38 and 44, and the normal operation mode and the energy saving operation mode in the system 10D can be performed by one controller 17. In addition, it is possible not only to save the trouble of installing the pressure indicating controller 33 and the temperature indicating controllers 38 and 44 in the piping path, but also to replace the pressure indicating controller 33 and the temperature indicating controllers 38 and 44 with the controller 17. Can reduce costs.

  In the systems 10A and 10D of FIG. 1 and FIG. 6, instead of the pressure sensor 34, the pressure sensor 66 may be installed in the branch pipe 16 of the fourth group 21, which is the end group through which the heat source water finally flows. In the system 10 </ b> B of FIG. 4, the pressure sensor 34 may be installed in the feed main pipe 15 a extending in the vicinity of the heat source water pump 13 instead of the pressure sensor 66. Although not shown, in the systems 10A to 10D of FIGS. 1, 4, 5, and 6, the output control (heat source water supply amount control) of the heat source water pump 13 is an estimated terminal of the flow rate and the water supply pressure. Pressure control (cascade control) can also be used.

10A Water heat source heat pump unit piping system 10B Water heat source heat pump unit piping system 10C Water heat source heat pump unit piping system 10D Water heat source heat pump unit piping system 11 Cooling tower (heat source device)
12 Water heater (heat source device)
13 heat source water pumps 14a to d water heat source multi-type heat pump unit 15a feed main pipe 15b return main pipe 16a feed branch pipe 16b return branch pipe 17 controller (control mechanism)
18 First air-conditioning target group 19 Second air-conditioning target group 20 Third air-conditioning target group 21 Fourth air-conditioning target group 33 Pressure indicating controller (control mechanism)
34 Pressure sensor 37 Temperature sensor 38 Temperature indicating controller (control mechanism)
39 Bypass pipe 40 Switching valve 41 Switching valve 42 Switching valve 43 Temperature sensor 44 Temperature indicating controller (control mechanism)
45 Bypass pipe 46 Switching valve 47 Switching valve 48 Switching valve 65 Bypass pipe 66 Pressure sensor 67 Flow compensation valve (Flow compensation mechanism)
68 Inverter device (control mechanism)

Claims (8)

A plurality of air-conditioning target groups formed from a predetermined number of air-conditioned spaces, a heat source device that cools or heats the heat source water, a main pipe that circulates the heat source water to the group and the heat source apparatus, and each group from the main pipe Branch pipes extending into the air-conditioned spaces of the groups, heat source water pumps installed in the main pipes for supplying the heat source water to the main pipes and the branch pipes, and individually for each air-conditioned space of each group And a water heat source multi-type heat pump unit that cools or heats the air-conditioned space using the heat source water flowing in the branch pipe, and the heat source water is supplied from the feed main pipe of the main pipe to the branch pipe. The heat source water is allowed to flow into the feed branch pipes, and the heat source water is sent from the feed branch pipes to the units. With return to the branch pipe went back out of the branch pipe from the knit, in the water source heat pump unit piping system the heat source water from said went back branch pipe to flow into the went back main pipe of said main pipe,
The water heat source heat pump unit piping system includes a temperature sensor for measuring the temperature of the heat source water heat-exchanged in each unit of the group, and the heat source water heat-exchanged in each unit of one group And a control mechanism for executing one of the normal operation mode and the energy saving operation mode of the system based on the temperature of the heat source water output from the temperature sensor,
In the normal operation mode, the heat source water supplied from the heat source water pump flows into the feed branch pipe extending from the feed main pipe to each air-conditioned space of the group while maintaining the supply amount of the heat source water pump at a normal flow rate. Heat source water exchanged in each unit of the group is allowed to flow into the return main pipe from the return branch pipe extending to each air conditioning space of the group, and the energy-saving operation mode is heated in each unit of one group. The exchanged heat source water is caused to flow into each unit of the other group through the bypass pipe, and the heat energy of the heat source water is reused in each unit of the other group, and the supply amount of the heat source water pump is Water heat source heat pump unit piping system, characterized in that it can be less than the normal flow rate. Temu.   When the temperature of the heat source water output from the temperature sensor is higher than a set temperature in the heat source water cooling operation of the system, the control mechanism executes the normal operation mode of the system and is output from the temperature sensor. The water heat source heat pump unit piping system according to claim 1, wherein an energy saving operation mode of the system is executed when the temperature of the heat source water is lower than a set temperature.   When the temperature of the heat source water output from the temperature sensor is lower than a set temperature in the heat source water heating operation of the system, the control mechanism executes the normal operation mode of the system and is output from the temperature sensor. The water heat source heat pump unit piping system according to claim 1 or 2, wherein an energy saving operation mode of the system is executed when the temperature of the heat source water is higher than a set temperature.   The bypass pipe is connected to a return branch pipe extending in the vicinity of the return main pipe and extending to each conditioned space of one group, and is connected to the return branch pipe extending in the vicinity of the feed main pipe and extending to each conditioned space of the other group. Connected to a pipe, the temperature sensor is installed in a return branch pipe in the vicinity of the return main pipe, and measures the temperature of the heat source water flowing through the return branch pipe. In the energy saving operation mode, in each unit of one group Heat-exchanged heat source water is caused to flow into the bypass pipe from a return branch pipe extending to each conditioned space of the one group, and the heat source water is extended to each conditioned space of the other group via the bypass pipe. The water heat source heat pump unit piping system according to any one of claims 1 to 3, which is caused to flow into the water.   The bypass pipe is connected to the return main pipe extending between one group and the other group, and is connected to the feed main pipe extending between one group and the other group, and the temperature sensor is A heat source that is installed in the return main pipe extending between one group and the other group, measures the temperature of the heat source water flowing through the return main pipe, and in the energy saving operation mode, the heat source in which heat is exchanged in each unit of one group Water is introduced into the bypass pipe from the return main pipe extending between the one group and the other group, and heat source water flowing in the return main pipe extending between the one group and the other group is supplied to the bypass pipe. The water heat source according to any one of claims 1 to 3, wherein the water heat source is caused to flow into a feed main pipe connected to a branch pipe extending to each unit of the other group. Over door pump unit piping system.   In the branch pipes of the group, the flow rate of the heat source water flowing through the feed branch pipe and the return branch pipe of one group is the same as the flow rate of the heat source water flowing through the feed branch pipe and the return branch pipe of the other group. The water heat source heat pump unit piping system according to any one of claims 1 to 5, wherein a flow rate compensation mechanism is installed.   The system includes a pressure sensor that measures the pressure of the heat source water flowing in the main pipe and outputs the measured pressure to the control mechanism. The control mechanism is based on the pressure of the heat source water output from the pressure sensor. The water heat source heat pump unit piping system according to any one of claims 1 to 6, wherein a supply amount of the heat source water pump is adjusted.   The pressure sensor is installed in a branch pipe of the end group in which the heat source water supplied from the feed main pipe of the group flows lastly, measures a terminal differential pressure of the branch pipe of the end group, and measures the end The water heat source heat pump unit piping system according to claim 7, wherein a differential pressure is output to the control mechanism.

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