JP2011200097A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system that effectively utilizes power generated by a cogeneration system or the like and improves operation efficiency of a compressor of an air harmonizer.SOLUTION: The air conditioning system includes a system controller 3 that detects the power consumption of revolution variable compressors 130a to 130e included in the outdoor units 22a to 22e of an air handling unit 22. The indoor units 22A to 22E of the air handling unit 22 are provided in the same handled space 200. If the power consumption of the revolution variable compressor of any of the outdoor units 22a to 22e drops below a lower limit value, the system controller 3 stops the corresponding revolution variable compressor while rotating the indoor blower fans 28a to 28e included in the indoor units 22A to 22E connected to the corresponding revolution variable compressor.

Description

The present invention includes a generator and a cogeneration system using a gas engine or the like as a power source,
The present invention relates to an air conditioning system that includes a DC power generation device such as a solar power generation device and an air conditioner, and that effectively uses generated power and improves the operating efficiency of a compressor of the air conditioner.

Conventionally, large-scale factories and the like that consume a large amount of energy are provided with a gas heat pump (GHP) that drives a compressor by a gas engine, generates power using the surplus energy of the gas engine, and exhaust heat of the gas engine There is known a cogeneration system that improves the energy saving effect by using (see Patent Document 1 below).

Moreover, in order to air-condition one large space, the structure which has arrange | positioned the several air conditioner provided with the outdoor unit and the indoor unit is known (refer the following patent document 2). Furthermore, an air conditioner using a compressor (inverter compressor) having a variable rotation speed is widely known (see Patent Document 3 below). In particular, when a plurality of air conditioners equipped with inverter compressors are provided in one large space, the output of the compressor is variably controlled according to the room temperature of the conditioned space. The load is distributed so that the operation load of each air conditioner becomes substantially equal.

JP 2007-040593 A JP 09-229419 A Japanese Patent Laid-Open No. 05-322331

In the cogeneration system as disclosed in Patent Document 1, commercial power, a DC power generator that outputs DC power, such as a solar power generator, and a storage battery are combined, and the power charged in the storage battery is appropriately determined. Obtain power from the generator, DC power generator and commercial power source, and supply the power generated by the generator and DC power source to the load according to the power used for the load,
It has been desired to reduce power consumption from a commercial power source by making it possible to change whether the storage battery is charged and efficiently using the power charged in the storage battery.

In general, the operation efficiency of the inverter compressor becomes higher as the rotation speed is closer to the rated operation. On the other hand, when the rotational speed is low, the operating efficiency is lowered. For example, when the engine is operated at 30% or less of the rated rotational speed, the efficiency is remarkably lowered. For this reason, in the configuration in which a plurality of air conditioners equipped with an inverter compressor as shown in Patent Document 3 are installed, if the operating load is distributed almost evenly to each air conditioner, each air conditioner There is a concern that the rotational speed of the harmony machine will drop uniformly and the operating efficiency will be reduced.

The present invention has been made in view of the above-described circumstances, and a storage battery is charged by combining a cogeneration system, a commercial power, a DC power generator that outputs DC power such as a solar power generator, and a storage battery. Reduce power consumption from the commercial power supply so that power can be used efficiently, and avoid air conditioner compressors from operating under conditions of low operating efficiency, and efficiently perform air conditioning An object of the present invention is to provide an air-conditioning system capable of performing the above.

In order to achieve the above object, an air conditioning system of the present invention includes a compressor, a condenser, a decompression device, a refrigeration cycle using an evaporator, and a generator driven by a power source that drives the compressor. In the air conditioning system,
Wiring connected from the commercial power system and supplied with commercial power,
A storage battery,
A charging unit that controls charging of the storage battery; and
After converting DC power to AC power, a system linkage device that supplies the wiring,
A circuit for guiding the power of the storage battery to the grid linking device;
A circuit for guiding the power generated by the generator to the charging unit;
After converting the power generated by the generator into DC power, a circuit that leads to the system linkage device;
A DC power generator that outputs DC power, such as a solar power generator;
A circuit for guiding the output of the DC power generator to the charging unit;
A circuit for guiding the output of the DC power generator to the grid linking device;
A load for obtaining power through the wiring;
A detector for detecting power supplied to the load;
A control unit,
The load includes a plurality of air conditioners with a refrigeration cycle having a compressor, a condenser, a decompression device, and an evaporator driven by AC power obtained through the wiring,
The controller is
When the power detected by the detector is equal to or less than the sum of the power generated by the generator and the output of the DC power generator, the power generated by the generator and the output of the DC power generator are guided to the charging unit. Enable the circuit and enable the circuit that directs the power of the storage battery to the grid linking device,
When the power detected by the detector is equal to or greater than the sum of the power generated by the generator and the output of the DC power generator, a circuit that guides the power generated by the generator to the grid linking device is enabled. And enabling a circuit for guiding the output of the DC power generation device to the system linkage device,
When the power consumption of the compressor of the air conditioner is lower than a predetermined value, the air conditioner is operated while the operation of the blower for blowing air to the conditioned room arranged in the refrigeration cycle of the air conditioner is continued. The operation of the compressor of the machine is stopped.

In the present invention, a compressor, a condenser, a decompression device, a refrigeration cycle using an evaporator, and
A cogeneration system is configured by a generator driven by a power source that drives the compressor. In addition to the air-conditioning operation being performed by this refrigeration cycle, a plurality of air conditioners are separately formed by the refrigeration cycle.

That is, in the air conditioning system of the present invention, a cogeneration system constituted by a heat pump system and a generator, a DC power generator such as a solar power generator, a refrigeration using a compressor, a condenser, a decompressor, and an evaporator. It is equipped with an air conditioner using a cycle, and the storage battery is charged with the electric power generated by a cogeneration system or the like, and the electric power charged in this storage battery is supplied to a plurality of air conditioners in a time zone where power consumption is high. ing.

According to the air conditioning system of the present invention, when the power supplied to the load is small, the power generated by the generator in the cogeneration system and the power generated by the DC power generator such as a solar power generator are stored in the storage battery. Since power is supplied to the load while charging the battery, it is possible to save energy by suppressing the supply of power from the commercial power supply system.

Further, according to the air conditioning system of the present invention, when the load power consumption is large, the power generated by the generator in the cogeneration system and the power generated by the DC power generator such as a solar power generator are directly supplied to the load. Since the electric power supplied and further charged to the storage battery can be supplied to the load as appropriate, the use efficiency of the storage battery can be improved, and the power supply from the commercial power system can be further suppressed to save energy. At the same time, the storage battery can be used effectively throughout the day.

In addition, in the air conditioning system of the present invention, in addition to the air conditioning operation by the refrigeration cycle, the air conditioning system has a plurality of air conditioners that operate with AC power obtained through wiring, and the power consumption of the compressor of the air conditioner is predetermined. When the value is lower than the value, the operation of the compressor of the air conditioner is stopped while the operation of the blower for blowing air to the conditioned room arranged in the refrigeration cycle of the air conditioner is continued. Therefore, according to the air conditioning system of the present invention, since the operation of the compressor of the air conditioner that has been operated with low power consumption and poor operating efficiency is stopped, more power is supplied from the commercial power supply system. It will be possible to save energy by saving. Moreover, the compressor is stopped while the operation of the blower for blowing air to the conditioned chamber arranged in the refrigeration cycle of the air conditioner is continued, so that the air to the conditioned space continues even when the compressor is stopped. Therefore, even if the compressor is stopped, the temperature unevenness in the conditioned space can be suppressed.

In the air conditioning system of the present invention, the blower for blowing air to the conditioned room arranged in the refrigeration cycle of one air conditioner is usually arranged in the indoor unit of the air conditioner. There may be a plurality of units as well as a single unit.

Further, in the air conditioning system of the present invention, the control unit compresses the corresponding air conditioner when the power consumption of the compressor of the air conditioner continues below a predetermined value for a predetermined time. It is preferable to stop the operation of the machine.

Since the power consumption of the compressor of the air conditioner varies variously with time, it may cross a predetermined value many times in a short time. According to the air conditioning system of the present invention, when the state where the power consumption of the compressor of the air conditioner is lower than a predetermined value continues for a predetermined time, the operation of the corresponding compressor of the air conditioner is stopped. Therefore, the operation / stop of the compressor of the air conditioner is not repeated many times in a short time. The predetermined time is not limited, but may be set as appropriate within a range of several tens of minutes to about 1 hour.

In the air conditioning system of the present invention, the load includes a plurality of the air conditioners, and the same blower for blowing air to the conditioned chambers arranged in each refrigeration cycle of the plurality of air conditioners. When the power consumption of the compressor of any one of the air conditioners is less than a predetermined value, the control unit is disposed in the refrigeration cycle of the corresponding air conditioner. You may make it stop the driving | operation of the compressor of the said air conditioning apparatus in which the said power consumption falls below a predetermined value, with the driving | running of a fan continued. Even in this case, it is preferable that the control unit stops the operation of the compressor when the state where the power consumption of the air conditioner is lower than a predetermined value continues for a predetermined time.

In the air conditioning system of the present invention, in the case where a plurality of air conditioners are provided, if the power consumption of the compressor of any one of the air conditioners falls below a predetermined value, the air conditioner has a refrigeration cycle. The operation of the compressor of the air conditioner is stopped while continuing the operation of the blower for blowing air to the arranged conditioned room. Therefore, according to the air conditioning system of the present invention, since the operation of the compressor of the air conditioner being operated in a state where the power consumption is low and the operation efficiency is low, the compressor of the other air conditioner is In order to achieve the necessary air-conditioning condition, it will be operated with higher power consumption and improved operating efficiency, so it is possible to save energy by suppressing the supply of power from the commercial power supply system. become able to.

In this case as well, the blower for blowing air to the conditioned room arranged in the refrigeration cycle of one air conditioner is usually arranged in the indoor unit of the air conditioner. There may be a plurality of units as well as the case. In addition, if the operation of the corresponding compressor is stopped when the power consumption of the air conditioner continues below a predetermined value for a predetermined time, the compression of the air conditioner is repeated many times in a short time. The operation / stop of the machine will not be repeated.

Further, in the air conditioning system of the present invention, the control device is configured to refrigerate the corresponding air conditioner when the power consumption of the compressor of any one of the air conditioners exceeds the high load operation value. While continuing the operation of all the fans arranged in the cycle, the operation of the corresponding compressor of the air conditioner is stopped, and the compressor of the other air conditioner in the operation stop is started. It is preferable to do.

When the compressor of an air conditioner is continuously operated for a long time in a high-load operation state, the lifetime becomes a problem. According to the air conditioning system of the present invention, when the state where the power consumption of the compressor of any one of the air conditioners exceeds the high load operation value, the operation of the compressor of the air conditioner is stopped and the operation is stopped. Since the compressors of other air conditioners are started, the operating periods of each air conditioner compressor in the high load operation state are averaged, and the life of the compressor of a specific air conditioner is averaged. Will not be shortened.

Moreover, in the air conditioning system of this invention, it is preferable that the said control apparatus shall select and start the compressor with short accumulation drive time among the compressors of the said air conditioning apparatus which has stopped operation.

According to the air conditioning system of the present invention, when the state where the power consumption of the compressor of any one of the air conditioners exceeds the high load operation value, the operation of the compressor of the air conditioner is stopped and the operation is stopped. Among the compressors of the air conditioner, the compressor having a short cumulative drive time is selected and started, so that the operation period in the high load operation state of each compressor of the air conditioner is more average. Therefore, the life of the compressor of more specific air conditioner will not be shortened

Further, in the air conditioning system of the present invention, the control device is enabled with a circuit for guiding the power generated by the generator to the grid linking device and a circuit for guiding the output of the DC power generator to the grid linking device. When the power consumption of the load exceeds a set value, the operation of some of the plurality of air conditioners is stopped while the operation of all the fans is continued, and then the load consumption When the state where electric power exceeds the set value continues, it is preferable to change the compressor to be stopped.

If the circuit that leads the generator power to the grid connection device and the circuit that directs the output of the DC power generation device to the grid linkage device are enabled, the power consumption is the sum of the generator power and the DC generator output. Is greater than In addition, in stores and the like, air conditioners that consume a large amount of power are air conditioners. Therefore, if the power consumption of a load exceeds a set value, all of the air conditioners can be operated while continuing to operate all the fans. If the operation of the compressor of the part is stopped, the power consumption decreases. After that, when the state in which the power consumption of the load exceeds the set value continues, the power consumption is reduced less by the stopped air conditioner, so if the compressors that are sequentially stopped are changed, When the compressor of the air conditioner that consumes a large amount of power is stopped, the power consumption of the load may be smaller than the set value. In this case, the power consumption of the load may be made smaller than the set value by changing the number of air conditioners to be stopped.

In the air conditioning system of the present invention, it is preferable that the compressor of the air conditioner is a variable speed compressor having an inverter circuit.

The operation efficiency of the inverter compressor becomes higher as the rotation speed is closer to the rated rotation speed, and the operation efficiency is lowered when the rotation speed is lower. According to the air conditioning system of the present invention, the variable speed compressor having an inverter circuit is used as the compressor of the air conditioner, so that the effects of the present invention are remarkably exhibited.

It is a figure which shows the structure of the air conditioning system of this invention. It is a figure which shows the cooling circuit of a gas engine. It is the figure which showed typically schematic structure of the some air conditioning apparatus. It is the figure which showed typically the structure of one air conditioning apparatus. It is a block diagram which shows the structure of the compressor of an outdoor unit, and an electrical equipment box. It is a flowchart which shows the operation control of a solar power generation device. It is a flowchart which shows the charging / discharging control of a storage battery. It is a flowchart which shows the operation control of a rotation speed variable type compressor. It is a figure which shows an example of the driving | running state of a rotation speed variable type compressor. It is a figure which shows an example of the driving | running state of a rotation speed variable type compressor. It is a figure which shows an example of the driving | running state of a rotation speed variable type compressor. It is a figure which shows an example of the driving | running state of a rotation speed variable type compressor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an air conditioning system 100 in the present embodiment includes an electric power system 1, a hot water system 2, and an air conditioning system 100.
A system controller that monitors and controls the operating status of each device provided in the system (“
Corresponding to the “control section” 3.

The electric power system 1 includes a commercial power source 11 supplied from an electric power company and a plurality of external power generators interconnected to the commercial power source 11. The external power generator in this embodiment includes a solar power generator 12 as a DC power generator and a heat pump (GHP) driven by a gas engine.
And a GHP generator (hereinafter simply referred to as “generator”) 13 driven by the gas engine, and a storage battery 18. The power system 1 includes a PCS (system connection device) 14 with a built-in grid connection protection device, and the solar power generation device 12, the generator 13, and the storage battery 18 are connected to the commercial power supply 11 via the PCS 14. Are connected to the grid. PCS14
Is configured to include an inverter and a shut-off device, and converts DC power input from the interconnected system into AC power, and system faults (failures) in each interconnected system, such as short circuits and overcurrents. Alternatively, it is provided for detecting an overvoltage or the like and disconnecting the external power generation device or the like in which an accident has been detected from the power system 1. The storage battery 18 and the PCS 14 are built in the power conversion unit 15.

The commercial power source 11 has a main circuit breaker 31 and a detector 32, through which the PCS 1
4 are connected to the outdoor unit 21 of a gas heat pump cogeneration system (hereinafter referred to as “cogeneration system”) 20 equipped with a system controller 3, a power conversion unit 15, and a generator 13, respectively. 29b, 29
The power is distributed via c, and power for driving each device is supplied. Also,
In the present embodiment, the detector 32 is configured to prevent reverse flow and prevent current from flowing from the grid to the power company side. Further, the detector 32 detects the power supplied to the load.

The power conversion unit 15 includes magnet switches 17a and 17b, and external power generators other than the commercial power source, for example, the solar power generator 12 or the generator 13 are connected to the magnet switches 17a and 17b by wiring. The magnet switches 17a and 17b are controlled by the system controller 3, and when a system fault occurs in an external power generator such as the solar power generator 12 or the generator 13, the mechanical insulation state of the external power generator in which the accident is detected Is provided (fail-safe function), and the external power generator is parallel to the power system 1.

The magnet switches 17a and 17b include DC / DC converters 16 respectively.
a and 16b are connected. At this time, the electric power generated by the solar power generation device 12 or the generator 13 is branched into two wires. One is input to the DC / DC converters 16a and 16b via the magnet switches 17a and 17b, respectively, boosted to the operating power of the PCS 14 by the DC / DC converters 16a and 16b, and input to the PCS 14.
Supplied to each load. The other is common until it is input to the DC / DC converters 16a and 16b, and is supplied to a battery charger (corresponding to a “charging unit” of the present invention) 19 to be described later, and the storage battery 18 is charged. The change of the supply destination is the DC / DC converters 16a, 16
This is performed by the switch parts 17A and 17B provided between b, the PCS 14, and the battery charger 19. The switching of the switch units 17A and 17B will be described later. The PCS 14 incorporates an inverter (not shown), and the electric power generated by the solar power generation device 12 or the generator 13 is converted from a direct current by the inverter into a single-phase three-wire alternating current that is the same as that of a commercial power source. Supplied to line 1A.

According to these configurations, the power conversion unit 15 includes the PCS 14, the DC / DC converters 16a and 16b, and the magnet switches 17a and 17b that are connected to the DC / DC converters 16a and 16b and have a fail-safe function. Since a general-purpose external power generation device can be connected to the magnet switches 17a and 17b, the grid connection can be easily performed and the energy saving effect can be enhanced.

The power conversion unit 15 includes an active filter 82, a battery charger 19, a magnet switch 17c, and a storage battery 18. The storage battery 18 is connected to the battery charger 19 via the magnet switch 17c, and the battery The charger 19 has an active filter 8
2 to the commercial power supply 11. The active filter 82 has a rectifier circuit and a power factor adjustment circuit. The storage battery 18 is charged via the battery charger 19 with the power supplied from the commercial power supply and the power generated by the generator 13 and the solar power generator 12.

For charging from the commercial power supply 11, the battery charger 19 is controlled by the system controller 3, and midnight or night (for example, 23:00 to 6:59) is set as a charging time zone. In this charging time zone, By being charged by the power of the commercial power supply 11 and discharging during the day when the amount of power consumption is large, it is possible to realize a peak cut of the power consumption from the commercial power supply 11. In addition,
The battery charger 19 and the storage battery 18 or the connection between the storage battery 18 and the DC / DC converter 16c are configured to be supplied with power by controlling the opening and closing of the magnet switches 17c and 17d provided between them. ing.

Further, the magnet switch 17d ensures that the storage battery 18 and the power system 1 are mechanically insulated by disconnecting the storage battery 18 from the power system 1 when a system fault occurs in the power system supplied from the storage battery 18. . The power input to the DC / DC converter 16c is PC
The operating power is boosted to S14 and input to the PCS 14, from the DC current by the PCS 14,
It is converted into the same single-phase three-wire AC current as that of the commercial power supply and supplied to the system line 1A.

The solar power generation device 12 includes a solar cell panel (not shown) in which a plurality of solar cells that directly convert incident solar energy into electric power are connected in series, and the electric power generated here is supplied to the power conversion unit 15. It is input and supplied to the storage battery 18 or the PCS 14. Since the output voltage decreases when the solar cell panel becomes hot due to solar radiation, in this embodiment, a water-cooled heat sink or water channel is provided on the back surface of the solar cell panel, and an antifreeze liquid (brine) circulating in the air conditioning system 100 is provided here. The solar heat is collected to prevent the temperature of the solar battery panel from rising and the output of the solar power generation device 12 from being reduced. In this embodiment, the antifreeze is
It is a liquid (cooling water) that does not freeze in winter even in cold regions.

The generator 13 is mounted on the outdoor unit 21 of the cogeneration system 20. The outdoor unit 21 of the cogeneration system 20 includes a gas engine 24 that uses gas as fuel, a gas pipe 26a that supplies gas to the gas engine 24, and a gas supply port 26 to which the gas pipe 26a is connected. Gas pipe 26a is connected to engine 24 from gas supply port 26.
The gas engine 24 is driven by supplying the gas fuel via the.

The cogeneration system 20 is connected via the refrigerant pipe 91, a compressor 23 that is driven by using the gas engine 24 as a drive source, a refrigerant pipe 91 that circulates the refrigerant compressed by the compressor 23, and the refrigerant pipe 91. A refrigeration cycle including a condenser 92, a pressure reducing device 93, an evaporator 94, and the like is connected. When the outdoor unit 21 of the cogeneration system 20 is operated, the compressor 23 is driven by the gas engine 40 to establish a refrigeration cycle, thereby enabling an air conditioning operation. The surplus energy of the gas engine 24 is used to drive the generator 13 to generate power, and the generated power is converted from AC current to DC current via the rectifier circuit 25 and input to the power conversion unit 15. , Supplied to the storage battery 18 or the PCS 14.

According to these structures, the air conditioning system 100 in this embodiment is the solar power generation device 1.
2, the power output from the generator 13 and the storage battery 18 is converted into a DC / DC converter 16a,
It is a hybrid energy saving system that is input to the PCS 14 via 16b and 16c, converted into AC power, and grid-connected to the commercial power supply 11. The grid power thus interconnected is connected to the grid interconnection point 34 through the grid line 1A and via the breaker 33. From the grid interconnection point 34, lighting and OA equipment are provided via the breakers provided respectively. The power is distributed to various devices such as the air conditioner 22. The specific configuration of the air conditioner 22 will be described later.

Here, the cooling circuit of the gas engine 24 will be described. The gas engine 24 is a water-cooled type, and as shown in FIG. 2, an exhaust gas heat exchanger 111 for cooling the exhaust gas discharged from the gas engine in the cooling water circulation path 65 and the gas engine 24, and gas Engine 2
4 water jackets, and the engine cooling water is passed through them to lower the temperature of the exhaust gas and the temperature of the engine body.

The cooling water circulation path 65 is connected to the electric three-way valve 113, the cooling water pump 65a, and the heat exchanger 27. The cooling water heated through the exhaust gas heat exchanger 111 and the water jacket passes through the cooling water circulation path 65. The heat exchanger 2 through the electric three-way valve 113 and the cooling water pump 65a.
7, the heat exchanger 27 exchanges heat with the antifreeze liquid circulating in the cogeneration system 20, and recovers exhaust heat from the exhaust gas of the gas engine 24 and the water jacket with the antifreeze liquid.

Further, downstream of the heat exchanger 27 in the cooling water circulation path 65, there are an electric three-way valve 114, a radiator 1.
12 is connected by a cooling water pipe 65b, and the cooling water that has passed through the heat exchanger 27 passes through the cooling water circulation path 65.
Then, it is guided to the radiator 112 through the cooling water pipe 65b via the electric three-way valve 114. The heat of the cooling water passing through the radiator 112 is dissipated by the fan 28 provided in the radiator 112, and the temperature of the cooling water is reduced to a predetermined temperature. The cooling water that has passed through the radiator 112 passes through the cooling water return pipe 65c, and again, the exhaust gas heat exchanger 11 of the gas engine 24.
1 and the water jacket.

When the temperature of the cooling water passing through the exhaust gas heat exchanger 111 and the water jacket of the gas engine 24 is equal to or lower than a predetermined value, the cooling water is not led to the cooling water circulation path 65 and the electric three-way valve 11
3, through the cooling water bypass pipe 115, and the exhaust gas heat exchanger 11 of the gas engine 24.
1 and the water jacket.

Next, the hot water system 2 will be described. The hot water system 2 includes a hot water storage tank 41 that stores city water, and a heat pump water heater 50 that supplies hot water by heating the city water supplied from the hot water storage tank 41 with the heat of the refrigerant.
And is generally configured. The hot water heated by the heat pump water heater 50 is a hot water supply pipe 3
8, when a faucet (not shown) is opened on the side of the hot water inlet 81, the heat pump water heater 50 has a set temperature input by a user to a remote controller (not shown). It is operated so that hot water is supplied from the hot water supply port 81 through the hot water supply pipe 38.

The heat pump water heater 50 includes a compressor 53, a gas cooler 51 that performs heat exchange between the high-temperature refrigerant discharged from the compressor 53 and city water, an expansion valve 59, and an evaporator 52. The heat pump circuit is configured by being connected by the refrigerant pipe 54. In the present embodiment, the heat pump circuit is a supercritical heat pump circuit using carbon dioxide as a refrigerant. The evaporator 52 is provided with a fan unit 55 for air-cooling the evaporator 52. Power is supplied to the heat pump water heater 50 from the grid connection point 34 via a breaker 67, and power is distributed to drive the compressor 53, the fan unit 55, various sensors, and the like in the heat pump water heater 50. .

The hot water storage tank 41 accommodates a heat exchanger 61 therein, and supplies an antifreeze liquid (described later) to the heat exchanger 61 so as to exchange heat with the antifreeze liquid and raise the temperature of the city water.
The heat exchanger 61 is a heat exchanger configured such that, for example, a pipe is wound in a coil shape and an antifreeze liquid flows in the pipe, and the heat exchanger 61 is provided in a hot water storage tank 41 that stores city water. It has been.

The hot water storage tank 41 is connected with a city water supply pipe 36 for supplying city water to the hot water storage tank 41, and supplies hot water storage pipes for supplying the city water heated by the heat exchanger 61 to the heat pump water heater 50. The hot water storage hot water pipe 37 is connected to the water inlet 51 </ b> A of the gas cooler 51 through the hot water supply valve 56. Further, the water outlet 51 of the gas cooler 51
B is connected to a hot water supply pipe 38 via a hot water supply three-way valve 57. In this configuration, each pipe is connected so that the city water supplied to the gas cooler 51 and the refrigerant flow opposite to each other, so that heat exchange with the city water of the refrigerant can be performed efficiently. Yes.

The city water supply pipe 36 is provided with a water supply valve 88, and the city water supply pipe 36 is provided downstream of the water supply valve 88.
A city water supply pipe 35 branching from is connected. The city water supply pipe 35 is connected to the hot water storage hot water supply pipe 37 between the water inlet 51 </ b> A of the gas cooler 51 and the hot water supply valve 56 through the water supply valve 58. The city water supply pipe 35 is provided with a temperature sensor (not shown) that detects the temperature of the city water upstream of the water supply valve 58.

The hot water storage tank 41 is provided with a liquid level sensor 98 for detecting the amount of hot water stored in the hot water tank (city water stored in the hot water storage tank) and a temperature sensor 96 for detecting temperature. . When the liquid level sensor 98 detects that the amount of stored hot water has decreased to a predetermined amount or less, the water supply valve 88 is opened and city water is supplied to the hot water storage tank 41. Further, the hot water tank 41 is supplied with system power from the system interconnection point 34 via the breaker 66, and is supplied with power to various sensors 96, 98 and the like.

Connected to the hot water supply three-way valve 57 is a hot water supply pipe 84 from the hot water storage hot water supply pipe 37 through which the gas cooler 51 flows and hot water flows. When the set temperature input by the user is lower than the temperature of hot water supplied from the hot water storage tank 41 to the hot water hot water supply pipe 37, the hot water supply three-way valve 57 is opened so that hot water flows from the hot water pipe 84 side. The valve 56 and the water supply valve 58 are opened so that the city water is mixed with the hot water supplied from the hot water storage tank 41 and the temperature becomes appropriate for the installation temperature input by the user.

On the other hand, when the set temperature input by the user is higher than the temperature of hot water supplied from the hot water storage tank 41 to the hot water storage hot water supply pipe 37, the hot water supply three-way valve 57 is connected from the hot water storage hot water supply pipe 37 side through the gas cooler 51. The hot water flow is opened, the hot water pipe 84 side is closed, the hot water supply valve 56 is opened, the water supply valve 58 is closed, and flows into the gas cooler 51 from the hot water storage tank 41 through the hot water storage hot water supply pipe 37, The temperature is raised by exchanging heat with the refrigerant in the gas cooler 51 and supplied from the hot water supply port 81 via the hot water supply three-way valve 57. When the temperature of hot water supplied from the hot water storage tank 41 to the hot water storage hot water supply pipe 37 is lower than the city water temperature, the hot water supply valve 56 is closed and the water supply valve 58 is opened.
The city water is heated by exchanging heat with the refrigerant in the hot water storage hot water supply pipe 37 and the gas cooler 51, and the hot water supply three-way valve 57 is heated.
It is supplied from the hot water supply port 81 via.

In addition to the heat pump water heater 50, the hot water storage tank 41 is provided with a heating device 87 such as floor heating connected by piping, and hot water heated in the hot water storage tank 41 is supplied via a pump 85, a three-way valve 86, and the like. The hot water tank 41 and the heating device 87 are circulated.

Next, the circulation path of the antifreeze liquid connected to the heat exchanger 61 will be described. The heat exchanger 61 is connected with a return line 42 and a going line 43 for allowing the antifreeze liquid to flow into and out of the heat exchanger 61. A return pump 42 a is connected to the return pipe 42, and the antifreeze liquid is circulated through the heat exchanger 61 by the return pump 42 a.

A return header 63 is connected to the return pipe 42, and a liquid pipe 71 through which antifreeze that has recovered heat from the solar water heater panel 62 provided for generating hot water using solar heat flows is connected to the return header 63. The heat exchanger 27 recovered heat from the liquid pipe 72 through which the antifreeze recovered from the solar battery panel of the solar power generation device 12 flows and the cooling water of the gas engine 24 mounted in the outdoor unit 21 of the gas heat pump. A liquid pipe 73 through which the antifreeze liquid flows is connected to each other.

On the other hand, the outgoing header 64 is connected to the outgoing pipeline 43, and the liquid header 45 is connected to the outgoing header 64.
, 46, 47 are connected. The liquid pipe 45 is connected to the solar power generation device 12 via a pump 45a.
It is connected to the. The liquid pipe 46 is connected to the solar water heater panel 62 through a pump 46a. The liquid pipe 47 is connected to a heat exchanger 27 that water-cools the gas engine 24 via a pump 47a. The pumps 45a, 46a, and 47a are push-type pumps that exchange heat with city water from the outgoing header 64 to the solar power generation device 12, the solar water heater panel 62, and the heat exchanger 27, respectively, with the heat exchanger 61. It is configured to push and circulate the antifreeze liquid whose temperature has been lowered.

The return header 63 and the outgoing header 64 are connected by a bypass pipe 44, and the bypass pipe 44 is provided with a first motor-operated valve 48A. Further, the discharge port 63a of the return header 63
A differential pressure sensor 95 is provided between the suction port 64 b of the outgoing header 64. further,
A second motor-operated valve 48B is provided on the downstream side of the return pump 42a in the return line 42.

In this configuration, when the temperature sensor 96 provided in the hot water storage tank 41 detects that the temperature of the hot water stored in the hot water storage tank 41 has approached a predetermined temperature (for example, 60 degrees or more), In order to suppress the heat exchange load in the exchanger 61, the opening degree of the second motor-operated valve 48B is reduced, and the flow rate of the antifreeze liquid flowing through the heat exchanger 61 is adjusted. As a result, the return header 63
The pressure on the discharge port 63a side of the first motor valve 48 increases with the detection result of the differential pressure sensor 95 provided between the discharge port 63a of the return header 63 and the suction port 64b of the outgoing header 64.
When the opening of A is opened, the antifreeze liquid flows from the return header 63 to the outgoing header 64 by bypassing the heat exchanger 61.

In addition, when a problem such as a pipe clogging occurs in the heat exchanger 61, the detection result of the differential pressure sensor 95 is out of the predetermined pressure, and the opening degree of the first electric valve 48A is opened according to this detection result. Thus, the antifreeze liquid bypasses the heat exchanger 61 and goes directly from the return header 63 to the header 64 through the bypass pipe 44.

Thus, according to the present embodiment, the gas engine 24 is cooled by the heat exchanger 27 in order to cool the gas engine 24 to the outdoor unit 21 of the cogeneration system 20 including the compressor 23 driven by the gas engine 24. The cooling water and the antifreeze liquid are heat-exchanged, the temperature of the cooling water is lowered and the antifreezing liquid is heated, and the antifreeze liquid and the city water are heated by the heat exchanger 61 stored in the hot water storage tank 41 storing the city water. The temperature of the antifreeze liquid is lowered and the city water is heated, and the heated city water is supplied from the hot water storage tank 41 to the heat pump water heater 50 to supply hot water.

Therefore, the hot water storage tank 41 is provided in the hot water storage tank 41, and the antifreezing liquid is circulated through the hot water storage tank heat exchanger 61, and the exhaust heat of the gas engine 24 is efficiently used to efficiently use the hot water storage tank 41. The city water can be heated. Thereby, since reduction of the energy used with the heat pump water heater 50 can be aimed at, the hot water supply efficiency of the heat pump water heater 50 can be raised, and the energy saving effect improves.

Next, a specific configuration of the air conditioner 22 according to the embodiment will be described with reference to FIGS.
As shown in FIG. 3, the air conditioner 22 includes a plurality of outdoor units 22a to 22e and a plurality of indoor units 22A to 22E. As shown in FIG. 4, each of the outdoor units 22 a to 22 e is supplied with AC power from a wiring and has a variable speed compressor 13 having an inverter.
0a to 130e and heat source side heat exchangers 131a to 131e are provided. Each indoor unit 2
2A to 22E are utilization side heat exchangers 132A to 132E and indoor blower fans 133A to 13E.
3E is provided.

The commercial power supply 11 includes, as loads that receive power supply from the power system 1, the outdoor units 22a to 22e and the indoor units 22A to 22E of the lighting equipment, OA equipment, and air conditioner 22.
Are connected via breakers. Further, the system controller 3 is connected to the commercial power supply 11 via a main circuit breaker 31 and a breaker 29a. A solar radiation sensor (not shown) is connected to the system controller 3. In addition, the system controller 3 incorporates an RTC (not shown) that counts the current time, and communicates with the solar power generation device 12, the PCS 14, and the air conditioner 22 based on the current time measured by the RTC. Control of supply of electric power generated by the solar power generation device 12 to the air conditioner 22, start / stop of charging of the storage battery 18, supply of power from the storage battery 18 to the air conditioner 22, operation of the air conditioner 22, etc. I do.

Specifically, the system controller 3 is a DC / DC provided in the solar power generation device 12.
DC / DC converter 16 provided with converter 16a and storage battery 18
b communicates with a communication circuit (not shown) provided in the air conditioner 22. When solar radiation is detected by the solar radiation sensor, the system controller 3 drives the DC / DC converter 16a of the solar power generation device 12, and the electric power generated by the solar power generation device 12 is supplied to the predetermined voltage by the DC / DC converter 16a. Boost to value. Further, the system controller 3 closes the magnet switch 17a, supplies power from the DC / DC converter 16a to the PCS 14 or the battery charger 19 via the switch parts 17A and 17B, and starts charging / recharging the storage battery 18.
Control the stop.

As shown in FIG. 3, the air conditioner 22 has a configuration in which the outdoor units 22a to 22e are connected to the indoor units 22A to 22E by piping. In addition, each outdoor unit 22a-22
The number of indoor units 22A to 22E connected to e is one or more. In FIG. 3, four indoor units are connected in parallel to each of the outdoor units 22a to 22e. An example is shown. The plurality of air conditioners 22 can be independently operated and stopped under the control of the system controller 3. In the present embodiment, the refrigerant piping of each air conditioner 22 is independent, and the refrigerant does not mutually flow between the air conditioners 22.

The plurality of indoor units 22 </ b> A to 22 </ b> E are provided in the same conditioned space 200 and air-condition the tuned space 200. The plurality of outdoor units 22a to 22e are each independently
Based on the temperature of the intake air from the conditioned space 200 or the temperature detected by a temperature detector (not shown) provided in the conditioned space 200, the rotational speed variable compressors 130a to 130e of the outdoor units 22a to 22e. Autonomous adjustment of operation, stop, and operation speed.

Here, the rotation speed variable compressors 130a to 130 included in the outdoor units 22a to 22e are provided.
The configuration of e will be described. As shown in FIG. 4, the variable speed compressors 130a to 130e.
Are configured in the same manner, and these variable speed compressors 130a to 130e are provided with an electrical box 134 (see FIG. 5) having the same structure. Therefore, here, the variable speed compressor 130a included in the outdoor unit 22a is taken as an example. Will be described.

FIG. 5 is a block diagram showing a configuration of the variable speed compressor 130a and the electrical box 134 arranged in the outdoor unit 22a together with the variable speed compressor 130a. Electrical box 134
Includes a power terminal board 135 that receives AC power input from the commercial power supply 11, an AC / DC converter (rectifier) 136 that converts the supplied AC power into DC power, and AC power having an arbitrary frequency. The inverter circuit 137 that converts the output into the output and the main circuit 138 that controls the operation state of the variable speed compressor 130a based on the signal from the system controller 3 are housed.

The inverter circuit 137 receives a DC power input from a waveform generation circuit 139 that generates and outputs an AC waveform according to the control of the main circuit 138, and an AC / DC converter 136,
An HIC circuit (power transistor) 140 that converts these direct current power into alternating current according to the alternating current waveform output from the waveform generation circuit 139 and outputs the alternating current to a motor (not shown) that drives the variable speed compressor 130a. Have. The main circuit 138 controls the rotational speed of the variable speed compressor 130a by controlling the frequency of the AC waveform generated by the waveform generating circuit 139. In this way, the rotation speed variable compressor 130 a is driven by DC power supplied from AC power supplied from the commercial power supply 11.

As will be described later, the main circuit 138 constantly calculates the actual load power consumption rate A of the variable speed compressor 130a, and this actual load power consumption rate A is set to an overload operation value AL (see FIG. 8). ) Control so as not to drive beyond. Overload operation value AL is set to 95%, for example (
95% of the maximum number of rotations of the variable speed compressor 130a may be used as a setting value), in order to extend the service life by suppressing an excessive load on the variable speed compressor 130a. Be controlled. Further, the main circuit 138 includes the heat source side heat exchanger 13 of the outdoor unit 22a.
It is connected to a fan motor 141 that rotates a blower (not shown) attached to 1a, and controls the operation on / off of the fan motor 141 along with the operation on / off of the variable speed compressor 130a.

According to these configurations, the inverter circuit 137 provided in each of the variable speed compressors 130 a to 130 e can receive the input of DC power supplied from the commercial power supply 11 via the AC / DC converter 136. Therefore, reactive power can be reduced as much as possible, and power can be efficiently supplied to each of the variable speed compressors 130a to 130e.

Next, operation control of the electric power system 1 and each air conditioner 22 will be described. The solar power generation device 12 provided in the power system 1 generates power in response to solar radiation and outputs direct current power to the DC / DC converter 16a. The system controller 3 uses a preset time zone (for example, 7:00 am
Between 0 minutes and 17:59 in the evening, the magnet switch 17a is closed, and the power generated by the solar power generation device 12 is supplied to the battery charger 19 or the PCS.

FIG. 6 is a flowchart showing the control operation of the solar power generation device 12 of the system controller 3. As shown in FIG. 6, the system controller 3 first determines that the current time is 7:00 am
It is determined whether the time is between 17 minutes and 17:59 in the evening (step S1). The current time is 7 in the morning
If it is between 0:00 and 17:59 in the evening, it is next determined whether each air conditioner 22 is in operation (step S2). If each air conditioner 22 is in operation, it is subsequently determined whether there is solar radiation (step S3). When there is solar radiation, the magnet switch 17a is closed and the DC / DC converter 16a is driven to start power supply from the solar power generator 12 to the battery charger 19 or the PCS 14 (step S4). In the above processing, if the current time is not between 7:00 am and 17:59 in the evening (step S
1; No), when the air conditioner 22 is not in operation (step S2; No) and when there is no solar radiation (step S3; No), the system controller 3 returns to step S1 and repeats the process.

After starting the power supply from the solar power generation device 12 to the battery charger 19 or the PCS 14, the system controller 3 waits until the current time reaches 18:00 (step S5), and the current time becomes 18:00. At this point, the DC / DC converter 16a is stopped and the magnet switch 17a is opened, thereby terminating the power supply from the solar power generator 12 to the battery charger 19 or the PCS 14 (step S6).

Thus, since the system controller 3 supplies electric power from the solar power generation device 12 only when each air conditioner 22 is in operation and there is solar radiation between 7:00 and 17:59, The power is generated efficiently by the device 12, and the generated power is efficiently supplied to the battery chargers 19 to P.
It can be consumed by each air conditioner 22 via the CS 14. Therefore, the generated power is not wasted and the energy saving effect can be improved.

The storage battery 18 provided in the power system 1 is controlled by the system controller 3 in the middle of the night or at night (for example, from 23:00 to 6:59, when the power charge is reduced based on the late-night power contract or the hourly power contract. ) Is charged by the power of the commercial power supply 11 and discharged during the day when the amount of power consumption is large, thereby realizing a peak cut in the amount of power used from the commercial power supply 11 and reducing the power charge. . Charging and discharging of the storage battery 18 is performed by the system controller 3
Is controlled according to the preset time and the presence or absence of solar radiation.

Specifically, as shown in FIG. 7, the system controller 3 first sets the current time to night 23.
It is determined whether it is between 0:00 and 6:59 in the morning (step S11). The current time is night 2
When it is between 3:00 and 6:59 in the morning, the storage battery 1 is powered by the electric power of the commercial power source 11.
8 starts charging (step S12). The charging of the storage battery 18 by the power of the commercial power supply 11 is continued until 6:59 in the morning, and it is determined that the current time is 7:00 (step S13).
At that time, the charging of the storage battery 18 by the power of the commercial power supply 11 is stopped (step S14).
).

The system controller 3 determines whether each air conditioner 22 is in operation (step S15). If each air conditioner 22 is in operation, the system controller 3 determines whether there is solar radiation (step S16). If there is solar radiation, the amount of power supplied from the solar power generation device 12 is large. Therefore, the amount of power discharged from the storage battery 18 is controlled by the system controller 3 so as to compensate for the shortage of power supply from the solar power generation device 12.
On the other hand, when there is no solar radiation, power is not supplied from the solar power generation device 12 to the storage battery 18, so that the storage battery 18 is discharged in a time zone where the power consumption of each air conditioner 22 is large. It is controlled by the controller 3.

That is, when there is solar radiation (step S16; Yes), the system controller 3
As a result, the magnet switch 17d is closed and the storage battery 18 is discharged until the amount of power supplied from the solar power generation device 12 increases (for example, 9:00), and the power from the storage battery 18 to each air conditioner 22 is discharged. Supply is started (step S17). When the current time is 9:00 (step S18; Yes), the system controller 3 causes the switch unit 1 to
7A is switched to the storage battery 18 side, the magnet switch 17d is opened to stop the discharge from the storage battery 18, and the power supply from the storage battery 18 to each air conditioner 22 is temporarily terminated (step S19). Next, the system controller 3 stands by until a time (for example, 17:00) when the amount of power supplied from the solar power generation device 12 decreases (step S20), and when the time when the power amount decreases (step S20). S18; Yes), the magnet switch 17d is opened to start discharging from the storage battery 18, and each air conditioner 22 is started from the storage battery 18.
The power supply to is started (step S21). Thereafter, discharging from the storage battery 18 is continued until 22:59 (step S22), and when the current time is 22:59 (step S22).
22; Yes), the magnet switch 17d is opened, the discharge from the storage battery 18 is stopped,
Power supply from the storage battery 18 to each air conditioner 22 ends (step S23).

During the operation shown from step S17 to step S22, the system controller 3 constantly monitors the remaining amount of the storage battery 18, and determines that there is no remaining amount when the remaining amount falls below a preset lower limit value. The discharge of the storage battery 18 is terminated.

On the other hand, when there is no solar radiation (step S16; No), the system controller 3 stands by until the time when the power consumption increases (for example, 11:00), and when the corresponding time comes (step S26), the storage battery 18 The power supply to the air conditioner 22 is started (step S2).
7). Thereafter, the system controller 3 continues to discharge until the peak of power usage during the day (for example, 16:00) (step S28), and when the peak has elapsed (
Step S28; Yes), the discharge is terminated (Step S29).

The air conditioning system 100 according to the present embodiment includes the generator 13 connected to the gas engine 24, and the system controller 3 considers not only the load power of the air conditioner 22 but also the power consumption by other loads. Power from the solar power generator 12, generator 1
The power from 3 and the power from the storage battery 18 are controlled as shown below. Note that the output of the solar power generation device 12 is preferentially performed according to the control shown in FIGS. 6 and 7 depending on whether or not there is solar radiation, and further depending on the current time.

That is, when the power flowing through the load detected by the detector 32 is equal to or less than the sum of the power generated by the generator 13 and the output of the solar power generator 12, the magnet switches 17a to 17b.
Are closed and the switch parts 17A and 17B are switched to the battery charger 19 side.
Then, the generated power of the generator 13 is supplied to the battery charger 19 side via the DC / DC converter 16b, and the output of the solar power generator 12 is supplied to the battery charger 19, and a storage battery is appropriately used with each power. 18 is supplied to the DC / DC converter 16c and the PCS 14, and supplied to the load such as the air conditioner 22 through the system line 1A.

Further, when the power flowing through the load detected by the detector 32 becomes equal to or greater than the sum of the power generated by the generator 13 and the output of the solar power generation device 12, the magnet switches 17a, 17
b and 17d are closed, the magnet switch 17a is opened, and the switch units 17A and 17B are switched to the PCS 14 side. Then, the power from the generator 13 is converted into a DC / DC converter 16.
b, the power from the photovoltaic power generation device 12 is supplied to the PCS 14 via the DC / DC converter 16a, and the power of the storage battery 18 is appropriately supplied to the PCS 14 via the DC / DC converter 16c. Supply to load such as air conditioner 22.

Thus, in the electric power system 1, when the electric power supplied to the load is small, the electric power generated by the solar power generation device 12 and the electric power generated by the generator 13 are charged to the load while charging the storage battery 18. Since the power can be supplied, it is possible to save energy by suppressing the supply of power from the commercial power supply 11. Further, when the load power consumption is large, the power generated by the solar power generation device 12 and the power generated by the generator 13 are directly supplied to the load, and the power charged in the storage battery 18 is also appropriately loaded. Since the battery can be supplied directly, the utilization efficiency of the storage battery 18 is improved, the supply of electric power from the commercial power supply 11 can be further suppressed to save energy, and the storage battery 18 is effectively used throughout the day. Will be able to.

In addition, the system controller 3 provides a solar radiation sensor to detect the amount of solar radiation,
It is good also as a structure which determines the presence or absence of solar radiation. Moreover, it is good also as a structure which provides the weather information receiving means which receives the weather information which the company or various organizations which transmit weather information distributes, and determines the presence or absence of solar radiation based on the information which this weather information receiving means received. Or the solar radiation amount of the light-receiving surface of the solar power generation device 12 is estimated based on the power generation amount of the solar power generation device 12, and this solar radiation amount,
By comparing the average amount of solar radiation stored in advance by month, time zone, and weather,
The presence or absence of current solar radiation may be determined. Alternatively, by comparing the amount of solar radiation detected by the solar radiation sensor with a reference value obtained based on the installation direction, inclination angle, latitude of the installation point, solar declination, weather information, etc. The presence or absence of solar radiation may be determined.

In addition, the operation control of the air conditioning system 100 according to the present embodiment is performed by using the outdoor units 22a to 22e and the indoor unit 2 provided in each air conditioner 22 forming the air conditioning system 100.
This is performed by controlling 2A to 22E with the system controller 3. By the way, the variable speed compressors 130a to 130e provided in the outdoor units 22a to 22e are most energy when the power consumption rate with respect to the power consumption at the rated operation (100%) is operated around a predetermined value (for example, 80%). When the efficiency is improved and the operation is performed with a low power consumption rate (for example, 30%), the operation efficiency tends to decrease and the energy efficiency tends to deteriorate.

Therefore, in the present embodiment, two values of the high load operation value UL and the lower limit value LL are determined in advance and stored in the system controller 3 as indices of the power consumption rate of the variable speed compressors 130a to 130e. deep. The system controller 3 includes variable speed compressors 13.
The power consumption rate of 0a to 130e is monitored, the variable speed compressors 130a to 130e operating with the power consumption below the lower limit LL are stopped, and the other variable speed compressors 130a to 130 are stopped.
The energy efficiency is improved by operating e in a state exceeding the lower limit LL.

Further, if the operation of the variable speed compressors 130a to 130e is continued for a long time at the high load operation value UL or more, the durability of the variable speed compressors 130a to 130e may be affected. When there is a variable speed compressor that has been operated for a predetermined time or more at a high load operation value UL or more, the system controller 3 stops the corresponding variable speed compressor and stops other The rotation speed variable type compressor is started, and the rotation speed variable compressors 130a to 130e are started.
The cumulative drive time is reduced. In order to perform such control, the system controller 3 is in an operating state with the cumulative drive time of each of the variable speed compressors 130a to 130e and the power consumption rate of each of the variable speed compressors 130a to 130e being equal to or lower than the lower limit LL. Is the duration (
T1) and the time (T2) during which the variable speed compressors 130a to 130e continue to operate at the high load operation value UL or higher are monitored and recorded.

Hereinafter, a specific control operation of the rotation speed variable compressors 130a to 130e by the system controller 3 will be described. FIG. 8 is a flowchart showing operation control of the variable speed compressors 130 a to 130 e executed by the system controller 3. In addition, FIG.
Each figure of FIG. 12 is a figure which shows the example of the driving | running state of the rotation speed variable compressors 130a-130e.

As shown in FIG. 8, first, the system controller 3 determines whether each air conditioner 22 is in operation (step S31). When each air conditioner 22 is in operation, the system controller 3 calculates the actual load power consumption rate A of each of the variable rotation speed compressors 130a to 130e (step S32). The actual load power consumption rate A of each of the rotation speed variable compressors 130a to 130e is determined based on the system controller 3 with respect to the rated power when each compressor is operated at 100% operation load.
Is the ratio of the power consumption of each compressor detected.

The system controller 3 uses the actual load power consumption rate A so that all of the variable speed compressors 1
In 30a to 130e, it is determined whether the system controller 3 is less than the high load operation value UL and exceeds the lower limit value LL (less than 80% and greater than 30%) (step S33). When all the rotational speed variable compressors 130a to 130e are operating in a state where the actual load power consumption rate A is less than 80% and greater than 30% (step S33; Yes)
) The current operation state of all the variable speed compressors 130a to 130e is continued (step S34), and the process proceeds to step S44.

In the example shown in FIG. 9, all the variable speed compressors 130a to 130e are operated in a state where the actual load power consumption rate A is less than 80% and greater than 30%. In this case, the operation efficiency is too low. Since the load is not too high, the operation is continued as it is.

On the other hand, among all the variable speed compressors 130a to 130e, the actual load power consumption rate A is 8
Variable speed compressors 130a-13 operating outside the range of less than 0% and greater than 30%
When 0e is detected (step S33; No), the system controller 3 determines whether there are any variable speed compressors 130a to 130e that are operating with the actual load power consumption rate A equal to or lower than the lower limit value LL ( Step S35).

In the example shown in FIG. 10, the variable speed compressor 130a is operated at an actual load power consumption rate A = 25%, and the variable speed compressor 130c is operated at an actual load power consumption rate A of 30%. ing. The rotation speed variable compressors 130a and 130c are operating in a state where the power consumption is lower than the lower limit value LL, and the operation efficiency is low. Thus, the actual load power consumption rate A is the lower limit value LL.
When there is a variable speed compressor operating in the following (step S35; Yes), the system controller 3 determines that the corresponding variable speed compressor has become the low load operation with the lower limit LL below. The elapsed time T1 is confirmed (step S36), and it is determined whether the low-load operation elapsed time T1 is, for example, 30 minutes or longer (step S37).

When the low load operation elapsed time T1 is 30 minutes or longer (step S37; Yes), the system controller 3 forcibly stops the corresponding compressor (step S38). At this time,
The system controller 3 stops the corresponding rotation speed variable compressor, while rotating the indoor blower fans 28a to 28e in the indoor units 22A to 22E of the air conditioner 22 having the stopped rotation speed variable compressor. Let it continue.

In the example shown in FIG. 10, the system controller 3 includes the variable speed compressors 130 a and 13.
Although 0c is stopped, the indoor blower fans 24a and 24c provided in the indoor units 22A and 22C connected to the variable speed compressors 130a and 130c by the refrigerant pipes are continuously rotated.

When the rotational speed variable compressors 130a, 130c are stopped, the rotational speed variable compressors 130a,
In the indoor units 21a and 21c connected to 130c, the temperature of the indoor air is not adjusted. For this reason, the temperature of the air in the conditioned space 200 circulated by each of the indoor blower fans 28a to 28e changes, and the other rotational speed variable compressors 130b and 13 that are operating are changed.
Indoor units 22B, 2 of outdoor units 22b, 22d, 22e having 0d, 130e
In 2D and 22E, the suction temperature changes. For this reason, since the operation load of the outdoor units 22b, 22d, and 22e where the rotation speed variable compressor is not stopped increases, the power consumption rate of these outdoor units 22b, 22d, and 22e increases, and thus the conditioned space 200 air conditioning is continued. In this way, the load on each of the variable speed compressors 130b, 130d, and 130e is adjusted without integrally controlling the outdoor units 22b, 22d, and 22e.

Further, the system controller 3 stops the stopped variable speed compressors 130a, 130.
Since the indoor blowing fans 28a and 28c provided in the indoor units 22A and 22C connected to the refrigerant c by the refrigerant pipe are continuously rotated, the amount of air circulation in the conditioned space 200 does not decrease. For this reason, even if the operating number of the rotation speed variable compressors 130a to 130e decreases, temperature unevenness in the conditioned space 200 can be suppressed. Further, when the low load operation elapsed time T1 is, for example, within 30 minutes (step S37; No), each variable speed compressor 1
The monitoring of 30a to 130e is continued and the process proceeds to step S44.

Further, the variable speed compressor 130 operating with the actual load power consumption rate A equal to or lower than the lower limit LL.
When there is no a to 130e (step S35; No), the system controller 3 is operating with the variable load compressors 130a to 130a in which the actual load power consumption rate A is operating at the high load operation value UL or more.
It is determined whether there is 0e (step S39). When the actual load power consumption rate A is not higher than the high load operation value UL and there are no variable speed compressors 130a to 130e (step S3)
9; No), the system controller 3 continues to monitor each of the variable speed compressors 130a to 130e and proceeds to step S44.

In the example shown in FIG. 11, the variable speed compressor 130a has an actual load power consumption rate A of 85%.
The variable speed compressor 130a is operated at an actual load power consumption rate A of 80%. In this case, the variable speed compressors 130a and 130c are operating in a state where the power consumption is higher than the high load operation value UL.

As illustrated in FIG. 11, when there are variable speed compressors 130 a to 130 e that are operating at an actual load power consumption rate A equal to or higher than the high load operation value UL (step S <b>39; Yes), the system controller 3 The high load operation elapsed time T2 of the corresponding compressor is confirmed (step S).
40). Next, the system controller 3 determines whether or not the high load operation elapsed time T2 is 120 minutes or more (step S41). If the high load operation elapsed time T2 is 120 minutes or more, for example, each rotation speed is variable. The accumulated drive time of the mold compressors 130a to 130e is confirmed (step S42).

Here, the system controller 3 forcibly stops the variable speed compressors 130a and 130c for which the high load operation elapsed time T2 has continued for 120 minutes or more, and among the stopped variable speed compressors 130b and 130d, A compressor with a short cumulative driving time is selected and started, and operation is passed (step S43). At this time, the system controller 3 continues the rotation of the indoor blower fan provided in the indoor unit connected to the stopped compressor and the refrigerant pipe. If the high load operation elapsed time T2 is not 120 minutes or longer, the system controller 3 continues to monitor the high load operation elapsed time T2 of the variable speed compressor, and proceeds to step S44. In addition, after passing the operation at step S42, the system controller 3 performs step S42.
44.

In the example shown in FIG. 11, when the high load operation elapsed time T2 of the variable speed compressors 130a and 130c is 120 minutes or more, the system controller 3 performs the operation pass-through, as illustrated in FIG. Among the stopped variable speed compressors 130b and 130d,
A compressor with a short cumulative drive time is selected, the compressor is started, and the variable speed compressors 130a and 130c are forcibly stopped.

In step S44, the system controller 3 determines whether or not the end of the operation of each air conditioner 22 has been instructed (step S44). If each air conditioner 22 ends the operation, all the rotation speed variable compressions are performed. All the outdoor units 22a-22e including a machine are stopped (step S45), and this process is complete | finished. Moreover, when not stopping each air conditioner 22, step S3
Return to 1.

According to these configurations, the actual load power consumption rate A becomes equal to or lower than the lower limit value LL, and the other variable rotation speed compressor is stopped by stopping the variable speed rotation compressor that is operating in a low operating efficiency state. Since the operation load is concentrated on the compressor and these variable speed compressors can be operated in an energy efficient state, the energy efficiency of the air conditioning system 100 can be improved.

Further, when there is a variable speed compressor that has been operating for a predetermined time or more with the actual load power consumption rate A exceeding the high load operation value UL, the corresponding variable speed compressors 130a to 130a-1 are provided.
30e is stopped, and among the already stopped variable speed compressors, the variable speed compressors with a short cumulative drive time are started to perform the pass-through operation. Therefore, the individual variable speed compressors 130a to 130a
It is possible to average the operation time of 130e and prevent the uneven operation of the rotation speed variable compressors 130a to 130e.

Furthermore, even when any of the variable speed compressors 130a to 130e is stopped, the system controller 3 causes the outdoor unit 2 on which the stopped variable speed compressor is mounted.
Since the indoor blow fans 28a to 28e of the indoor units 22A to 22E connected to the refrigerant units 2a to 22e are continuously rotated, the circulating air volume of the air in the conditioned space 200 does not decrease, and the conditioned space 200 It is possible to prevent temperature deviation in the interior. Accordingly, one or a plurality of variable number of rotation compressors 130a to 130e can be stopped to improve energy efficiency, and air conditioning in the conditioned space 200 can be performed efficiently.

As described above, according to the air conditioning system 100 of the present embodiment, the system controller 3 has the actual load power consumption rate A of any one of the variable speed compressors 130a to 130e as the lower limit value LL, for example, 30%. , The indoor blower fans 28a to 28e included in the indoor units 22A to 22E connected to the corresponding variable rotation speed compressors are rotated,
Since the corresponding variable rotation speed compressor is stopped, the low energy efficiency variable speed compressor operating in a low load state is stopped to improve the overall operation efficiency of the air conditioning system 100. Can be made.

Further, even when any of the variable speed compressors 130a to 130e is stopped,
Since the indoor blow fans 28a to 28e continue to rotate, the conditioned air supplied from the indoor units 22A to 22E connected to the operating variable speed compressor is covered by the indoor blow fans 28a to 28e. Since it can be circulated in the harmonious space 200, the tuned space 20
There is no bias in the temperature within 0, and air conditioning in the conditioned space 200 can be performed efficiently. Further, since each variable speed compressor operating in a low load state is stopped, the cumulative drive time of each variable speed compressor 130a-130e can be shortened, and each variable speed compressor The durability of the machines 130a to 130e can be improved.

Moreover, according to the air conditioning system 100 of this embodiment, each rotation speed variable compressor 130a.
To 130e, such as low load operation or high load operation, the system controller 3
As a result, the system controller 3 causes each of the variable speed compressors 13 to be controlled.
By controlling the forced stop of the operation of 0a to 130e or the start of operation, the operation efficiency of each of the variable speed compressors 130a to 130e is improved, and as a result, the operation efficiency of the air conditioning system 100 can be improved. it can.

Moreover, according to the air conditioning system 100 of the present embodiment, the system controller 3 determines that the actual load power consumption rate A of the variable speed compressors 130a to 130e of any of the outdoor units 22a to 22e is the lower limit value LL, for example, When the state below 30% continues for a preset time, for example, 30 minutes, the indoor units 22A to 22E connected to the corresponding variable speed compressors 130a to 130e by the refrigerant supply pipe Indoor fan 2
Since the corresponding rotation speed variable compressors 130a to 130e are stopped while rotating 8a to 28e, the rotation speed variable compressor 130a that has been operated for a predetermined time or more in a low load state with poor operation efficiency. -130e can be stopped and the energy efficiency of the air conditioning system 100 can be improved.

At this time, since the indoor blower fans 28a to 28e remain rotating, the air in the conditioned space 200 is circulated. As a result, the operating variable speed compressors 130a to 130e are operating.
Are the indoor units 22 connected to the corresponding variable speed compressors 130a to 130e.
The load increases according to the temperature change of the intake air of A to 22E, and as a result, the operating variable speed compressors 130a to 130e are operated at the power consumption rate around the high load operation value UL with the best operation efficiency. can do.

Further, according to the present embodiment, the system controller 3 determines that the actual load power consumption rate A of the variable speed compressors 130a to 130e of the outdoor units 22a to 22e of the air conditioner 22 is the high load operation value UL. For example, when the state exceeding 80% continues for 120 minutes or more, for example, the indoor air blow fans 28a to 28e included in the indoor units 22A to 22E connected to the corresponding variable speed compressors by the refrigerant supply pipe The specific rotation speed variable compressors 130a to 130e are in a high load state in order to stop the corresponding rotation speed variable compressor while rotating and start other rotation speed variable compressors that are stopped. The operation of the compressor is not continued for a long time, and the durability of each compressor can be improved.

In addition, according to the present embodiment, the system controller 3 selects and starts a variable speed compressor of a short cumulative drive time from among the other variable speed compressors 130a to 130e that are stopped. It is possible to average the operation time of the variable speed compressors 130a to 130e, and it is possible to prevent the operation from being biased toward the specific variable speed compressors 130a to 130e. Therefore, the durability of the individual variable rotation speed compressors 130a to 130e can be enhanced.

As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to this. In the present embodiment, the solar power generation device 12 is configured to operate from 7:00 to 17:59 in the morning. However, the present invention is not limited to this, and a time period in which solar radiation can be detected by the solar radiation sensor provided in the system controller 3. May be configured to continue the operation of the solar power generation device 12, or when the amount of power generated by the solar power generation device 12 exceeds a threshold value, the magnet switch 17a.
It is good also as a structure which closes and supplies electric power. Moreover, in this embodiment, on the day without solar radiation,
Although it was set as the structure which complete | finishes the discharge from the storage battery 18 at 16:00, it is good also as a structure which continues the discharge from the storage battery 18 as long as there is the remaining capacity of the storage battery 18 not only in this.

In the present embodiment, the actual load power consumption rate A is lower than the lower limit value LL or the high load operation value U.
Although it was set as the structure which stops the rotation speed variable type compressor which has been drive | operated more than L for more than predetermined time, it is not restricted to this, The accumulation drive time of each rotation speed variable compressor is another rotation speed variable type. When it becomes longer than a predetermined time when compared with the compressor, the system controller 3 may stop the corresponding compressor and pass the operation to another variable speed compressor. Any other detailed configuration can be arbitrarily changed.

DESCRIPTION OF SYMBOLS 1 ... Electric power system 1A ... System line 2 ... Warm water system 3 ... System controller 11 ...
Commercial power supply 12 ... Solar power generation device 13 ... Generator 14 ... PCS (system linkage device) 15
... Power conversion units 17a to 17d ... Magnet switches 17A, 17B ... Switch unit 18 ... Storage battery 19 ... Battery charger 20 ... Cogeneration system 21 ... Outdoor unit of cogeneration system 22 ... Air conditioner 22a-22e ... Outdoor unit 22A ~ 22E ... Indoor unit 23 ... Compressor 24 ... Gas engine 31 ... Main circuit breaker 32 ... Detector 34 ... System interconnection point 130a-130e ... Variable speed compressor 131a-131e ... Heat source side heat exchanger 132A-132E ... Use side heat exchanger 13
3A to 133E ... Blower 134 ... Electrical box 135 ... Power supply terminal board 136 ... AC / DC converter 137 ... Inverter circuit 138 ... Main circuit 139 ... Waveform generating circuit 1
40 ... HIC circuit (power transistor) 141 ... fan motor 200 ... conditioned space A actual load power consumption LL ... lower limit value UL ... high load operation value T1 ... low load operation elapsed time T2 ... high load operation elapsed time

Claims (7)

In an air conditioning system having a compressor, a condenser, a decompression device, a refrigeration cycle using an evaporator, and a generator driven by a power source that drives the compressor,
Wiring connected from the commercial power system and supplied with commercial power,
A storage battery,
A charging unit that controls charging of the storage battery; and
After converting DC power to AC power, a system linkage device that supplies the wiring,
A circuit for guiding the power of the storage battery to the grid linking device;
A circuit for guiding the power generated by the generator to the charging unit;
After converting the power generated by the generator into DC power, a circuit that leads to the system linkage device;
A DC power generator that outputs DC power, such as a solar power generator;
A circuit for guiding the output of the DC power generator to the charging unit;
A circuit for guiding the output of the DC power generator to the grid linking device;
A load for obtaining power through the wiring;
A detector for detecting power supplied to the load;
A control unit,
The load includes a plurality of air conditioners with a refrigeration cycle having a compressor, a condenser, a decompression device, and an evaporator driven by AC power obtained through the wiring,
The controller is
When the power detected by the detector is equal to or less than the sum of the power generated by the generator and the output of the DC power generator, the power generated by the generator and the output of the DC power generator are guided to the charging unit. Enable the circuit and enable the circuit that directs the power of the storage battery to the grid linking device,
When the power detected by the detector is equal to or greater than the sum of the power generated by the generator and the output of the DC power generator, a circuit that guides the power generated by the generator to the grid linking device is enabled. And enabling a circuit for guiding the output of the DC power generation device to the system linkage device,
When the power consumption of the compressor of the air conditioner is lower than a predetermined value, the air conditioner is operated while the operation of the blower for blowing air to the conditioned room arranged in the refrigeration cycle of the air conditioner is continued. The air conditioning system characterized by stopping the operation of the compressor of the machine. When the state where the power consumption of the compressor of the air conditioner is lower than a predetermined value continues for a predetermined time, the control unit stops the operation of the corresponding compressor of the air conditioner. The air conditioning system according to claim 1. The load includes a plurality of the air conditioners, and a blower for blowing air to the conditioned rooms arranged in each refrigeration cycle of the plurality of air conditioners is arranged in the same conditioned room,
When the power consumption of the compressor of any one of the air conditioners is lower than a predetermined value, the control unit continues the operation of the blower arranged in the refrigeration cycle of the corresponding air conditioner, The air conditioning system according to claim 1, wherein the operation of the compressor of the air conditioner whose power consumption is less than a predetermined value is stopped. When the state where the power consumption of the compressor of the air conditioner is lower than a predetermined value continues for a predetermined time, the control unit stops the operation of the corresponding compressor of the air conditioner. The air conditioning system according to claim 3. When the state where the power consumption of the compressor of any one of the air conditioners exceeds the high load operation value is continued, the control device is configured so that all the blowers arranged in the corresponding refrigeration cycle of the air conditioner The operation of the compressor of the corresponding air conditioner is stopped while the operation of the air conditioner is continued, and the compressor of the other air conditioner that is stopped is started.
Air conditioning system as described in. The air conditioner according to any one of claims 3 to 5, wherein the control device selects and starts a compressor having a short cumulative drive time from among the compressors of the air conditioner that is not in operation. system. In the control device, a circuit for guiding the generated power of the generator to the grid linkage device and a circuit for guiding the output of the DC power generation device to the grid linkage device are enabled, and the power consumption of the load has a set value. In the case of exceeding, the operation of some compressors of the plurality of air conditioners is stopped while continuing the operation of all the blowers, and then the state in which the power consumption of the load exceeds the set value continues. The air-conditioning system according to claim 2, wherein the compressor to be stopped is changed when the engine is stopped.

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