JP6994218B2 - Load-responsive air conditioning control system and method - Google Patents

Description

The present invention relates to an air conditioning control system, and particularly an air conditioning control system and a method using a variable water amount control for controlling the flow rate of cold / hot water to an air conditioner and a variable water transfer temperature control for controlling the water supply temperature of the heat source machine as a method for controlling the heat source. It is about.

Conventionally, as a control method for an air-conditioning heat source system, variable water volume control (VWV: Variable Water Volume) that controls a cold / hot water circulation pump and variable water temperature control (VWT: Variable Water Temperature) that controls the water supply temperature of a heat source device have been known. (See Patent Document 1).

FIG. 7 is a block diagram showing a configuration of a conventional air conditioning control system that employs VWV control as a heat source control method. The air conditioning control system shown in FIG. 7 includes heat source machines 1-1, 1-2 that generate hot and cold water, and primary pumps 2-1 and 2-2 as auxiliary machines for these heat source machines 1-1, 1-2. , Outbound headers 3-1 and 3-2 that mix cold and hot water (water supply) from multiple heat source machines 1-1, 1-2, water supply pipeline 4, and AHU (Air Handling Unit) 5 that is a load device. -1, FCU (Fan Coil Unit) 5-2, which is also a load device, return water pipeline 6, and cold / hot water that is heat-exchanged in AHU5-1 and FCU5-2 and sent through the return water pipeline 6. The return path header 7 through which (return water) is returned, the secondary pumps 8-1 to 8-3 provided between the outward path headers 3-1 and 3-2, and the outward path headers 3-1 and 3-2. A bypass valve 9 provided between the two, a discharge pressure sensor 10 for measuring the water supply pressure, an forward temperature sensor 11 for measuring the water supply temperature, a return temperature sensor 12 for measuring the return water temperature, and a return water flow rate. It is composed of a flow meter 13 for measuring. The secondary pumps 8-1 to 8-3 have inverters 14-1 to 14-3 and control valves 15-1 and 15-2 for adjusting the flow rate of cold and hot water flowing through AHU5-1 and FCU5-2, respectively. I have.

The cold / hot water (water supply) pumped by the primary pumps 2-1 and 2-2 and added with heat by the heat source machines 1-1 and 1-2 is sent to the outbound header 3-1 and is sent to the secondary pump 8-1. It is pumped by 8-3 and supplied to the water pipe 4 via the outbound header 3-2. Then, the cold / hot water passes through AHU5-1 and FCU5-2, reaches the return header 7 as return water by the return water pipe 6, and is pumped again by the pumps 2-1 and 2-2. In this way, the cold and hot water circulates in the above path.

The control device (not shown) determines the overall control state (total control state) from the respective control states determined by the control valve 15-1 of the AHU5-1 and the control valve 15-2 of the FCU5-2. The pressure settings of the secondary pumps 8-1 to 8-3 are changed according to this total control state as shown in Table 1.

The control device raises the water supply pressure set value when it is determined to be in the "insufficient capacity" state, maintains the current water supply pressure set value when it is determined to be in the "appropriate capacity" state, and is "excessive capacity". If it is determined that the condition is, the water supply pressure set value is lowered. Then, the control device controls the frequency of the inverters 14-1 to 14-3 of the secondary pumps 8-1 to 8-3 and the opening degree of the bypass valve 9 based on the water supply pressure set value.

Here, the "insufficient capacity" state means that the opening degree of each control valve (not shown) for controlling the flow rate of the cold / hot water flowing through the AHU5-1 and FCU5-2 is almost fully opened, and the AHU5-1 and FCU5 are in the state of "insufficient capacity". A state in which the temperature of the air (supply air) cooled or heated by -2 and the supply air temperature set value SP are separated from each other. The "appropriate capacity" state means that the opening degree of the control valves of AHU5-1 and FCU5-2 is almost fully opened, and the supply air temperature and the supply air temperature set value SP are almost the same. The "excessive capacity" state means a state in which the opening degree of the control valve of the AHU5-1 and FCU5-2 is equal to or less than a certain opening degree.

As described above, when the air conditioning load is small, the control valves of AHU5-1 and FCU5-2 are closed and the operation is slightly performed. When the control valves of AHU5-1 and FCU5-2 are closed, the transfer power of the secondary pumps 8-1 to 8-3 is wasted by the amount of the pressure loss of the control valves. Therefore, in VWV control, the transfer power of the secondary pumps 8-1 to 8-3 is reduced by relaxing the water supply pressure set value so that the control valves of AHU5-1 and FCU5-2 are opened as much as possible. At this time, in order to change the water supply pressure set value according to the control state of AHU5-1 and FCU5-2 to relax the water supply pressure set value and to prevent the water supply pressure set value from being lowered too much, AHU5-1 , Monitor the control status of FCU5-2.

Even when VWT control is adopted as the heat source control method, the configuration of the air conditioning control system is the same as in the case of VWV control shown in FIG. In the case of VWT control, the control device (not shown) determines the total control state from the control states of the control valve 15-1 of the load device AHU5-1 and the control valve 15-2 of the FCU5-2, and determines the total control state. As shown in Table 2, the water supply temperature setting of the heat source is changed according to the control state.

During the cooling operation, the control device lowers the water supply temperature set value when it is determined to be in the "insufficient capacity" state, and maintains the current water supply temperature set value when it is determined to be in the "capacity appropriate" state. If it is determined that the capacity is excessive, the water supply temperature set value is increased. Then, the control device controls the temperature of the water supply from the heat source machines 1-1 and 1-2 based on the water supply temperature set value.

In VWT control, the primary energy of the heat source machines 1-1 and 1-2 can be reduced by changing the water supply temperature setting according to the control state of AHU5-1 and FCU5-2. However, if the water supply temperature of the heat source machines 1-1 and 1-2 is raised too much during the cooling operation, the air conditioning load cannot be processed. Therefore, if the air conditioning load is small, the water supply temperature is raised, and when the air conditioning load is large, the water supply temperature is lowered, so that the primary heat source machines 1-1 and 1-2 follow the load. I try to reduce energy.

Japanese Patent Application Laid-Open No. 2003-262384

In the air conditioning control system disclosed in Patent Document 1, in order to realize energy saving of the pump and the heat source machine at the same time, VWV control and VWT control are executed at the same time.
However, when VWV control and VWT control are executed at the same time, there is a possibility that the controls interfere with each other. As an example of interference, for example, when the water supply temperature set value rises due to VWT control and the required water amount increases, the VWV control side receives a request to raise the water supply pressure set value, and the transfer power of the secondary pump increases. There is an example.

In order to avoid such control interference, it was necessary for the operator to take measures such as manually switching between VWV control and VWT control.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a load response type air conditioning control system and method capable of suppressing interference between VWV control and VWT control.

The load-responsive air conditioning control system of the present invention includes an air conditioner, a heat source machine configured to generate cold / hot water, a pump configured to supply the cold / hot water to the air conditioner, and the air conditioner. The first control state determination unit configured to determine the control state of, and the hot and cold water supply pressure set value are set according to the air conditioning load represented by the control state in the priority execution mode of water change amount control. The water supply pressure setting unit configured to fix the water supply pressure set value in the non-priority execution mode of the water change amount control, and the pump is controlled so that the water supply pressure of the cold / hot water matches the water supply pressure set value. In the non-priority execution mode of the variable water temperature control, the water supply pressure control unit is configured to set the water supply temperature set value of the cold / hot water according to the air conditioning load in the priority execution mode of the variable water temperature control. The water supply temperature setting unit configured to fix the water supply temperature set value and the water supply temperature control configured to control the heat source machine so that the water supply temperature of the cold / hot water matches the water supply temperature set value. When the water supply pressure set value reaches the limit value in the priority execution mode of the water change amount control, the water supply temperature is switched to the priority execution mode of the water change water temperature control, and the water supply temperature is switched in the priority execution mode of the water change water temperature control. It is characterized by including a control switching unit configured to switch to the priority execution mode of the water change amount control when the set value reaches the limit value.

Further, one configuration example of the load response type air conditioning control system of the present invention includes a control valve configured to adjust the flow rate of cold and hot water passing through the air conditioner, and the temperature of the supply air supplied from the air conditioner. A valve opening control unit configured to control the opening degree of the control valve so as to match the supply air temperature set value is further provided, and the first control state determination unit is the control valve. It is characterized in that the control state of the air conditioner is determined based on the opening degree and the temperature of the supply air.
Further, in one configuration example of the load response type air conditioning control system of the present invention, a plurality of the air conditioners are provided, and the control states determined for each air conditioner by the first control state determination unit are integrated into one. A second control state determination unit configured to determine the total control state is further provided, and the water supply pressure setting unit is described according to the air conditioning load represented by the total control state in the priority execution mode of the water change amount control. The water supply pressure setting value of the cold / hot water is set, and the water supply temperature setting unit sets the water supply temperature setting value of the cold / hot water according to the air conditioning load represented by the total control state in the priority execution mode of the variable water supply temperature control. It is characterized by that.
Further, in one configuration example of the load response type air conditioning control system of the present invention, the second control state determination unit is subjected to a majority voting process of the control state determined for each air conditioner by the first control state determination unit. It is characterized in that the total control state is determined.

Further, in one configuration example of the load response type air conditioning control system of the present invention, the control switching unit controls the variable water transfer temperature when the water supply pressure set value reaches the lower limit value in the priority execution mode of the variable water amount control. When the water supply temperature set value in the case of cooling operation reaches the lower limit value in cooling operation in the priority execution mode of the variable water supply temperature control, or in the case of heating operation, the water supply temperature set value is It is characterized in that when the upper limit value during heating operation is reached, the mode is switched to the priority execution mode of the water change amount control.
Further, in one configuration example of the load response type air conditioning control system of the present invention, the water supply pressure setting unit sets the water supply pressure set value to the lower limit value when the priority execution mode of the water change amount control is switched to the non-priority execution mode. The water supply temperature setting unit fixes the water supply temperature setting value to the lower limit value during cooling operation or the upper limit value during heating operation when the priority execution mode of the variable water supply temperature control is switched to the non-priority execution mode. It is characterized by that.

Further, in the load response type air conditioning control method of the present invention, the first step of determining the control state of the air conditioner and the air conditioning load represented by the control state in the priority execution mode of the water change amount control are sent to the air conditioner. The second step of setting the water supply pressure set value of the supplied cold / hot water, the third step of fixing the water supply pressure set value in the non-priority execution mode of the water change amount control, and the air conditioner for the cold / hot water. The fourth step of controlling the pump to supply the cold / hot water so that the water supply pressure matches the water supply pressure set value, and the cold / hot water according to the air conditioning load in the priority execution mode of the variable water temperature control. The fifth step of setting the water supply temperature set value, the sixth step of fixing the water supply temperature set value in the non-priority execution mode of the variable water supply temperature control, and the water supply temperature of the cold / hot water are the water supply temperature set values. The seventh step of controlling the heat source machine from which the cold / hot water is generated so as to coincide with, and the variable water temperature when the water supply pressure set value reaches the limit value in the priority execution mode of the water change amount control. The eighth step of switching to the priority execution mode of control and the ninth step of switching to the priority execution mode of water change amount control when the water supply temperature set value reaches the limit value in the priority execution mode of the variable water temperature control. It is characterized by including and.

According to the present invention, the water supply pressure setting unit, the water supply pressure control unit, the water supply temperature setting unit, the water supply temperature control unit, and the control switching unit are provided, and the water supply pressure set value reaches the limit value in the priority execution mode of the water change amount control. Water change amount control by switching to the priority execution mode of variable water temperature control and switching to the priority execution mode of water change amount control when the water supply temperature set value reaches the limit value in the priority execution mode of variable water temperature control. And variable water temperature control can be switched automatically. In the present invention, it is possible to suppress the interference between the variable water amount control and the variable water temperature control by prioritizing the control without executing the variable water amount control and the variable water transfer temperature control at the same time.

FIG. 1 is a block diagram showing a configuration of a load response type air conditioning control system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of an air conditioning controller of the load response type air conditioning control system according to the embodiment of the present invention. FIG. 3 is a block diagram showing a configuration of a heat source controller of the load response type air conditioning control system according to the embodiment of the present invention. FIG. 4 is a flowchart illustrating the operation of the air conditioning controller of the load response type air conditioning control system according to the embodiment of the present invention. FIG. 5 is a flowchart illustrating the operation of the heat source controller of the load response type air conditioning control system according to the embodiment of the present invention. FIG. 6 is a diagram illustrating the operation of the load response type air conditioning control system according to the embodiment of the present invention. FIG. 7 is a block diagram showing a configuration of a conventional air conditioning control system.

Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a load response type air conditioning control system according to an embodiment of the present invention, and the same configuration as that of FIG. 7 is designated by the same reference numeral. The air conditioning control system of this embodiment includes heat source machines 1-1, 1-2, primary pumps 2-1, 2-2, outbound headers 3-1, 3-2, water supply line 4, and AHU5. -1, FCU5-2, return water pipeline 6, return path header 7, secondary pumps 8-1 to 8-3, bypass valve 9, discharge pressure sensor 10, forward temperature sensor 11, and so on. The return temperature sensor 12, the flow meter 13, the inverters 14-1 to 14-3 provided for each of the secondary pumps 8-1 to 8-3, and the flow rate of the cold and hot water flowing through the AHU5-1 and FCU5-2. Control valves 15-1 and 15-2 to adjust, and supply air temperature sensors 16-1 and 16-2 to measure the temperature of air (supply air) cooled or heated by AHU5-1 and FCU5-2. It consists of an air conditioning controller 17 that controls valves 15-1 and 15-2, a heat source controller 18 that controls secondary pumps 8-1 to 8-3, a bypass valve 9, and heat source machines 1-1 and 1-2. Will be done.

As in the conventional case, the cold / hot water (water supply) pumped by the primary pumps 2-1 and 2-2 and added with heat by the heat source machines 1-1 and 1-2 is sent to the outbound header 3-1 and 2 It is pumped by the next pumps 8-1 to 8-3, supplied to the water pipe line 4 via the outbound header 3-2, and supplied to the AHU5-1 and the FCU5-2. Then, the hot and cold water is heat exchanged in AHU5-1 and FCU5-2, and the primary pumps 2-1 and 2-2 are exchanged via the control valves 15-1, 15-2, the return water pipe 6, and the return header 7. It is returned to and pumped again by the primary pumps 2-1 and 2-2.

FIG. 2 is a block diagram showing the configuration of the air conditioning controller 17, and FIG. 3 is a block diagram showing the configuration of the heat source controller 18.
The air conditioner controller 17 includes a valve opening control unit 171 that controls the opening degree of the control valves 15-1 and 15-2 so that the supply air temperature and the supply air temperature set value match, and an air conditioner (AHU5-1, The total control state determination unit 173 that integrates the control state determination unit 172 that determines the control state of the FCU5-2) and the control state determined for each air conditioner by the control state determination unit 172 into one. And have.

The heat source controller 18 sets the water supply pressure setting value of cold / hot water according to the air conditioning load in the priority execution mode of VWV control, and fixes the water supply pressure setting value in the non-priority execution mode of VWV control. The water supply pressure control unit 181 that controls the secondary pumps 8-1 to 8-3 and the bypass valve 9 so that the water supply pressure of cold and hot water matches the water supply pressure set value, and according to the air conditioning load in the priority execution mode of VWT control. The water supply temperature setting unit 182 that sets the water supply temperature set value for cold and hot water and fixes the water supply temperature set value in the non-priority execution mode of VWT control, and the heat source so that the water supply temperature for cold and hot water matches the water supply temperature set value. The water supply temperature control unit 183 that controls the machines 1-1 and 1-2 switches to the priority execution mode of VWT control when the water supply pressure set value reaches the limit value in the priority execution mode of VWV control, and the priority of VWT control. It is provided with a control switching unit 184 for switching to the priority execution mode of VWV control when the water supply temperature set value reaches the limit value in the execution mode.

Hereinafter, the operation of the load response type air conditioning control system of this embodiment will be described. FIG. 4 is a flowchart illustrating the operation of the air conditioning controller 17, and FIG. 5 is a flowchart illustrating the operation of the heat source controller 18.

The supply air temperature sensors 16-1 and 16-2 measure the temperatures T1 and T2 of the air (supply air) that is cooled or heated by AHU5-1 and FCU5-2 and supplied to the air conditioning zone (not shown), respectively. ..

The control valves 15-1 and 15-2 are provided for each air conditioner (AHU5-1, FCU5-2). When the air conditioning control is started, the valve opening control unit 171 of the air conditioning controller 17 controls the valve so that the supply air temperature T1 measured by the supply air temperature sensor 16-1 and the supply air temperature set value SP match. The opening degree φ1 of 15-1 is controlled. Similarly, the valve opening degree control unit 171 controls the opening degree φ2 of the control valve 15-2 so that the supply air temperature T2 measured by the supply air temperature sensor 16-2 and the supply air temperature set value SP match. (FIG. 4, step S100). The supply air temperature set value SP is preset, for example, by an operator.

The control state determination unit 172 of the air conditioning controller 17 determines the current control state (air conditioning load) of the AHU5-1 (step S101 in FIG. 4). Specifically, in the control state determination unit 172, when the opening degree φ1 of the control valve 15-1 of the AHU5-1 is equal to or higher than the threshold value TH1 (TH1 is a predetermined value close to fully open (100%)) during the cooling operation of the air conditioner. If the relationship between the supply air temperature T1 and the supply air temperature set value SP is T1> SP + α (α is a predetermined deviation), it is determined that the state is “insufficient capacity” during the cooling operation.

Further, in the control state determination unit 172, the opening degree φ1 of the control valve 15-1 is equal to or higher than the threshold value TH1 during the heating operation of the air conditioner, and the relationship between the supply air temperature T1 and the supply air temperature set value SP is T1 <SP-. If it is α, it is determined that the state is “insufficient capacity” during heating operation. That is, when the control valve 15-1 is almost fully opened and the supply air temperature T1 and the supply air temperature set value SP are separated from each other, the control state determination unit 172 determines that the state is "insufficient capacity".

Further, in the control state determination unit 172, the opening degree φ1 of the control valve 15-1 is equal to or higher than the threshold value TH1 during the heating / cooling operation, and the relationship between the supply air temperature T1 and the supply air temperature set value SP is SP −α ≦ T1 ≦ SP + α. If so, it is determined that the state is “appropriate in capacity” during the heating / cooling operation. That is, when the control valve 15-1 is almost fully opened and the supply air temperature T1 and the supply air temperature set value SP are substantially the same, the control state determination unit 172 determines that the state is “appropriate capacity”.

Further, if the opening degree φ1 of the control valve 15-1 is equal to or less than the threshold value TH2 (TH2 <TH1) during the heating / cooling operation, the control state determination unit 172 determines that the state is “excessive capacity” during the heating / cooling operation. That is, when the opening degree of the control valve 15-1 is equal to or less than a certain opening degree, the control state determination unit 172 determines that the state is "excessive capacity".
The control state determination unit 172 also determines the current control state of the FCU 5-2 in the same manner as the AHU 5-1 (step S101).

Next, the total control state determination unit 173 of the air conditioning controller 17 determines the total control state of the entire air conditioning control system from the control states of AHU5-1 and FCU5-2 (step S102 in FIG. 4).

In this embodiment, a majority voting method is used in which the most control state among the control states of a plurality of air conditioners (AHU5-1, FCU5-2) is adopted as the total control state. The total control state determination unit 173 determines that the entire air conditioning control system is in the "insufficient capacity" state when the "insufficient capacity" state is the most, and the air conditioning control system when the "appropriate capacity" state is the most. It is determined that the whole is in the "appropriate capacity" state, and when the "excessive capacity" state is the most, the entire air conditioning control system is determined to be in the "excessive capacity" state.

When one or more units of the total control calculation unit 173 are in the "insufficient capacity" state, the total control calculation unit 173 is "insufficient in capacity" as a whole of the air conditioning control system regardless of the number of "excessive capacity" and "appropriate capacity". Judged as the state of. Further, the total control calculation unit 173 determines that the air conditioning control system as a whole is in the "excessive capacity" state when there is no "insufficient capacity" state and only the "excessive capacity" state exists. do. Further, when the total control state determination unit 173 has a mixture of "capacity excess" and "capacity suitability" states, the total control state determination unit 173 determines that the air conditioning control system as a whole is in the "capacity suitability" state.

Then, the total control state determination unit 173 sends out control state information indicating the determined total control state to the heat source controller 18 (step S103 in FIG. 4).
The air conditioning controller 17 performs the above processes of steps S100 to S103 at regular time intervals until the air conditioning is stopped (YES in step S104 of FIG. 4).

Next, the operation of the heat source controller 18 will be described. First, the operator selects whether to preferentially execute VWV control or VWT control before starting the air conditioning operation, and specifies whether to preferentially execute VWV control or VWT control for the heat source controller 18. Perform the designation operation in advance (step S200 in FIG. 5). In this embodiment, an example will be described in which the operation is first started by VWV control and automatically shifts to VWT control when the lower limit set value of VWV is reached.

The control switching unit 184 of the heat source controller 18 receives a priority designation operation from the operator and outputs a priority execution mode signal that sets the execution mode of the water supply pressure setting unit 180 for VWV control to the priority execution mode (FIG. 5). Step S201), a non-priority execution mode signal for setting the execution mode of the water supply temperature setting unit 182 for VWT control to the non-priority execution mode is output (FIG. 5, step S202).

The water supply pressure setting unit 180 of the heat source controller 18 that has received the priority execution mode signal sets the water supply pressure set value WPSP by the normal VWV control process (FIG. 5, step S203). Specifically, when the total control state indicated by the control state information from the air conditioning controller 17 indicates a state of "insufficient capacity", the water supply pressure setting unit 180 sets the current water supply pressure set value WPSP within a predetermined width. If the total control state indicates the "appropriate capacity" state, the current water supply pressure set value WPSP is maintained, and if the total control state indicates the "excessive capacity" state. , The current water supply pressure set value WPSP is lowered by a predetermined width.

When the water supply pressure set value WPSP has already reached a predetermined upper limit value WPH and the total control state indicates a state of "insufficient capacity", the water supply pressure setting unit 180 sets the water supply pressure set value WPSP. The upper limit value WPH is left as it is. Further, when the water supply pressure setting value WPSP has already reached a predetermined lower limit value WPL (WPL <WPH) and the total control state indicates a state of "excessive capacity", the water supply pressure setting unit 180 sends water. The pressure set value WPSP is left as the lower limit value WPL.

The discharge pressure sensor 10 provided in the outbound header 3-2 measures the water supply pressure WP. The water supply pressure control unit 181 of the heat source controller 18 has the secondary pumps 8-1 to 8-1 so that the water supply pressure WP measured by the discharge pressure sensor 10 and the water supply pressure set value WPSP set by the water supply pressure setting unit 180 match. The frequency of the inverters 14-1 to 14-3 of 8-3 (the number of rotations of the secondary pumps 8-1 to 8-3) and the opening degree of the bypass valve 9 are controlled (FIG. 5, step S204).

Next, when the water supply pressure setting value WPSP reaches a predetermined upper limit value WPH (YES in step S205 of FIG. 5), the water supply pressure setting unit 180 outputs an improvement limit notification signal (step S206 of FIG. 5). Further, when the water supply pressure setting value WPSP reaches a predetermined lower limit value WPL (YES in step S207 of FIG. 5), the water supply pressure setting unit 180 outputs a relaxation limit notification signal to the control switching unit 184 (FIG. 5). Step S208).

The water supply pressure setting unit 180 and the water supply pressure control unit 181 output a relaxation limit notification signal from the water supply pressure setting unit 180, and the execution mode of the water supply pressure setting unit 180 is set to a non-priority execution mode from the control switching unit 184 as described later. The processing of steps S203 to S207 is performed at regular intervals until the non-priority execution mode signal is output.

On the other hand, unlike the normal VWT control, the water supply temperature setting unit 182 of the heat source controller 18 that has received the non-priority execution mode signal sets the water supply temperature set value WTSP to a fixed value (rated value) (FIG. 5, step S209). The rated value of the water supply temperature set value WTSP at this time may be determined in advance so that, for example, the energy consumption of the heat source machines 1-1 and 1-2 becomes an appropriate value.

The outbound temperature sensor 11 provided in the outbound header 3-2 measures the water supply temperature WT. The water supply temperature control unit 183 of the heat source controller 18 is a heat source machine 1-1, 1 so that the water supply temperature WT measured by the forward temperature sensor 11 and the water supply temperature set value WTSP set by the water supply temperature setting unit 182 match. -2 is controlled (FIG. 5, step S210).

The water supply temperature setting unit 182 and the water supply temperature control unit 183 output a relaxation limit notification signal from the water supply pressure setting unit 180, and the execution mode of the water supply temperature setting unit 182 is set to the priority execution mode from the control switching unit 184 as described later. The processing of steps S209 and S210 is performed at regular time intervals until the priority execution mode signal is output.

When the air conditioning load continues to decrease, the water supply pressure set value WPSP gradually decreases and finally reaches the lower limit value WPL, and the relaxation limit notification signal is output from the water supply pressure setting unit 180 as described above.

When the relaxation limit notification signal is output from the water supply pressure setting unit 180, the control switching unit 184 of the heat source controller 18 sets the execution mode of the water supply pressure setting unit 180 for VWV control to the non-priority execution mode. Along with outputting a signal, a priority execution mode signal for setting the execution mode of the water supply temperature setting unit 182 for VWT control to the priority execution mode is output (step S211 in FIG. 5).

When the water supply temperature setting unit 182 receives the priority execution mode signal from the control switching unit 184 (YES in step S212 of FIG. 5), the water supply temperature setting unit 182 sets the water supply temperature set value WTSP by normal VWT control (step S213 of FIG. 5). Specifically, the water supply temperature setting unit 182 is the current water supply temperature when the total control state indicated by the control state information from the air conditioning controller 17 indicates a "insufficient capacity" state during the cooling operation of the air conditioner. If the set value WTSP is lowered by a predetermined width and the total control state indicates the "appropriate capacity" state during the cooling / heating operation, the current water supply temperature set value WTSP is maintained and the total control state becomes "" during the cooling operation. When the state of "excessive capacity" is shown, the current water supply temperature set value WTSP is increased by a predetermined range.

Further, when the total control state indicates the state of "insufficient capacity" during the heating operation of the air conditioner, the water supply temperature setting unit 182 raises the current water supply temperature set value WTSP by a predetermined range during the heating operation. When the total control state indicates the "appropriate capacity" state, the current water supply temperature set value WTSP is maintained, and when the total control state indicates the "excessive capacity" state during the heating operation, the current water supply temperature set value WTSP is maintained. The current water supply temperature set value WTSP is lowered by a predetermined width.

If the water supply temperature setting value WTSP has already reached the predetermined lower limit value WTCL during cooling operation during the cooling operation, and the total control state indicates "insufficient capacity", the water supply temperature setting unit 182 indicates that the capacity is insufficient. The water supply temperature set value WTSP is left as the lower limit value WTCL, the water supply temperature set value WTSP has already reached the predetermined upper limit value WTCH during cooling operation during cooling operation, and the total control state indicates a state of "excessive capacity". In this case, the water supply temperature set value WTSP is left as the upper limit value WTCH.

Further, when the water supply temperature setting value WTSP has already reached the predetermined upper limit value WTHH during the heating operation during the heating operation, the water supply temperature setting unit 182 indicates that the total control state is "insufficient capacity". The water supply temperature set value WTSP is left as the upper limit value WTHH, the water supply temperature set value WTSP has already reached the predetermined lower limit value WTHL (WTCL <WTCH <WTHL <WTHH) during the heating operation, and the total control state is ". When the state of "excessive capacity" is shown, the water supply temperature set value WTSP is left as the lower limit value WTHL.

Since the operation of the water supply temperature control unit 183 in step S214 of FIG. 5 is the same as that of step S210, the description thereof will be omitted.
Next, in the water supply temperature setting unit 182, when the water supply temperature set value WTSP reaches the predetermined cooling operation upper limit value WTCH during the cooling operation, or when the water supply temperature set value WTSP reaches the predetermined heating operation lower limit value WTHL during the heating operation. (YES in step S215 of FIG. 5), the relaxation limit notification signal is output (step S216 of FIG. 5).

Further, the water supply temperature setting unit 182 sets the water supply temperature set value WTSP to the predetermined upper limit value WTHH during the heating operation when the water supply temperature set value WTSP reaches the predetermined lower limit value WTCL during the cooling operation or during the heating operation. When the temperature is reached (YES in step S217 of FIG. 5), an improvement limit notification signal is output to the control switching unit 184 (step S218 of FIG. 5).

The water supply temperature setting unit 182 and the water supply temperature control unit 183 output an improvement limit notification signal from the water supply temperature setting unit 182, and the execution mode of the water supply temperature setting unit 182 is set to the non-priority execution mode from the control switching unit 184 as described later. The processing of steps S213 to S217 is performed at regular time intervals until the non-priority execution mode signal is output.

On the other hand, unlike the normal VWV control, the water supply pressure setting unit 180 that has received the non-priority execution mode signal sets the water supply pressure set value WPSP as a fixed value (step S219 in FIG. 5). At this time, since the water supply pressure set value WPSP is the lower limit value WPL, the water supply pressure setting unit 180 fixes the water supply pressure set value WPSP with the current lower limit value WPL.

Since the operation of the water supply pressure control unit 181 in step S220 of FIG. 5 is the same as that of step S204, the description thereof will be omitted.
The water supply pressure setting unit 180 and the water supply pressure control unit 181 output an improvement limit notification signal from the water supply temperature setting unit 182, and the execution mode of the water supply pressure setting unit 180 is set to the priority execution mode from the control switching unit 184 as described later. The processing of steps S219 and S220 is performed at regular time intervals until the priority execution mode signal is output.

If the air conditioning load continues to rise, the water supply temperature set value WTSP gradually decreases during cooling operation and reaches the lower limit value WTCL during cooling operation, or the water supply temperature set value WTSP gradually increases during heating operation and the upper limit during heating operation. When the value WTHH is reached, the improvement limit notification signal is output from the water supply temperature setting unit 182.

When the improvement limit notification signal is output from the water supply temperature setting unit 182, the control switching unit 184 outputs a priority execution mode signal that sets the execution mode of the water supply pressure setting unit 180 for VWV control to the priority execution mode. A non-priority execution mode signal for setting the execution mode of the water supply temperature setting unit 182 for VWT control to the non-priority execution mode is output (step S221 in FIG. 5).

When the water supply pressure setting unit 180 receives the priority execution mode signal from the control switching unit 184 (YES in step S222 of FIG. 5), the water supply pressure setting unit 180 returns to step S203.
Further, when the water supply temperature setting unit 182 receives the non-priority execution mode signal from the control switching unit 184, the water supply temperature setting unit 182 returns to step S209. At this time, the water supply temperature set value WTSP is set to the lower limit value WTCL during cooling operation during the cooling operation, and the water supply temperature set value WTSP is set to the upper limit value WTHH during the heating operation during the heating operation. The water supply temperature setting unit 182 fixes the water supply temperature set value WTSP with the current lower limit value WTCL or upper limit value WTHH (step S209).

FIG. 6 is a diagram illustrating the operation of the load response type air conditioning control system. Note that FIG. 6 describes the case of cooling operation. From time t1 to t2 in FIG. 6, VWV control is in the priority execution mode and VWT control is in the non-priority execution mode.
As described above, when the air conditioning load continues to decrease in the VWV control, the water supply pressure set value WPSP gradually decreases and finally reaches the lower limit value WPL, and the relaxation limit notification signal is output from the water supply pressure setting unit 180.

When the VWT control is in the non-priority execution mode, the water supply temperature set value WTSP is a fixed value (rated value), but at time t2, the relaxation limit notification signal is output from the water supply pressure setting unit 180, and the control switching unit 184 outputs the relaxation limit notification signal. When the priority execution mode signal is output to the water supply temperature setting unit 182, the VWT control is switched to the priority execution mode.

When the VWV control is switched to the non-priority execution mode, the water supply pressure set value WPSP is fixed at the lower limit value WPL.
When the air conditioning load continues to decrease in the VWT control during cooling operation, the water supply temperature set value WTSP gradually rises and finally reaches the cooling operation upper limit value WTCH, and at time t3, the relaxation limit notification signal is sent from the water supply temperature setting unit 182. It is output. When the relaxation limit notification signal is output from the water supply temperature setting unit 182, the VWV control does not shift to the priority execution mode.

If the air conditioning load continues to rise in VWT control during cooling operation, the water supply temperature set value WTSP gradually decreases and finally reaches the lower limit value WTCL during cooling operation, and an improvement limit notification signal is output from the water supply temperature setting unit 182. ..

When the VWV control is in the non-priority execution mode, the water supply pressure set value WPSP is a fixed value as described above, but at time t4, the water supply temperature setting unit 182 outputs an improvement limit notification signal, and the control switching unit 184 sends water. When the priority execution mode signal is output to the pressure setting unit 180, the VWV control is switched to the priority execution mode.

If the air conditioning load continues to rise in VWV control during cooling operation, the water supply pressure set value WPSP gradually increases and finally reaches the upper limit value WPH, and an improvement limit notification signal is output from the water supply pressure setting unit 180 at time t5. .. When the improvement limit notification signal is output from the water supply pressure setting unit 180, the VWT control does not shift to the priority execution mode.

As described above, in this embodiment, the interference between the VWV control and the VWT control can be suppressed by performing the control by prioritizing the VWV control and the VWT control without executing them at the same time.
In this embodiment, when the improvement limit notification signal is output from the water supply pressure setting unit 180, or when the relaxation limit notification signal is output from the water supply temperature setting unit 182, the heat source control execution mode is switched as described above. There is no such thing. However, by outputting these signals, it is possible to inform the operator that the equipment needs improvement.

Further, in this embodiment, an example in which the VWV control is first set to the priority execution mode and the operation is started has been described, but the VWT control may be set to the priority execution mode to start the operation first. When the operation is started with the VWT control set to the priority execution mode, the water supply pressure setting unit 180 in the non-priority execution mode sets the water supply pressure set value WPSP to a fixed value (rated value). The rated value of the water supply pressure set value WPSP at this time may be determined in advance so that, for example, the energy consumption of the secondary pumps 8-1 to 8-3 becomes an appropriate value.

Even when the operation is started with the VWT control set to the priority execution mode, the control switching unit 184 preferentially executes the VWV control when the relaxation limit notification signal is output from the water supply temperature setting unit 182 of the VWT control as described above. The mode may be switched, and the VWT control may be switched to the priority execution mode when the improvement limit notification signal is output from the water supply pressure setting unit 180 of the VWV control.

Further, in this embodiment, the number of air conditioners is two, AHU5-1 and FCU5-2, but the present invention is not limited to this, and it goes without saying that there may be three or more air conditioners.
Further, although the number of heat source machines is two, it goes without saying that there may be one or three or more heat source machines.

The air conditioning controller 17 described in this embodiment can be realized by a computer including a CPU (Central Processing Unit), a storage device, and an interface, and a program for controlling these hardware resources. Similarly, the heat source controller 18 can be realized by a computer and a program. The CPU of each device executes the process described in this embodiment according to the program stored in each storage device. Thereby, the load response type air conditioning control method of this embodiment can be realized.

The present invention can be applied to an air conditioning control system.

1-1, 1-2 ... heat source machine, 2-1, 2-2 ... primary pump, 3-1, 3-2 ... outbound header, 4 ... water supply pipeline, 5-1 ... AHU, 5-2 ... FCU, 6 ... Return water pipeline, 7 ... Return path header, 8-1 to 8-3 ... Secondary pump, 9 ... Bypass valve, 10 ... Discharge pressure sensor, 11 ... Outward temperature sensor, 12 ... Return temperature sensor, 13 ... Flow meter, 14-1 to 14-3 ... Inverter, 15-1, 15-2 ... Control valve, 16-1, 16-2 ... Supply air temperature sensor, 17 ... Air conditioning controller, 18 ... Heat source controller, 171 ... Valve opening control unit, 172 ... control state determination unit, 173 ... total control state determination unit, 180 ... water supply pressure setting unit, 181 ... water supply pressure control unit, 182 ... water supply temperature setting unit, 183 ... water supply temperature control unit, 184 … Control switching unit.

Claims (12)

With an air conditioner
A heat source machine configured to generate hot and cold water,
A pump configured to supply the hot and cold water to the air conditioner,
A first control state determination unit configured to determine the control state of the air conditioner,
The water supply pressure set value of the cold / hot water is set according to the air conditioning load represented by the control state in the priority execution mode of the water change amount control, and the water supply pressure set value is fixed in the non-priority execution mode of the water change amount control. The configured water supply pressure setting unit and
A water supply pressure control unit configured to control the pump so that the water supply pressure of the cold / hot water matches the water supply pressure set value.
It is configured to set the water supply temperature set value of the cold / hot water according to the air conditioning load in the priority execution mode of the variable water supply temperature control, and fix the water supply temperature set value in the non-priority execution mode of the variable water supply temperature control. Water supply temperature setting unit and
A water supply temperature control unit configured to control the heat source machine so that the water supply temperature of the cold / hot water matches the water supply temperature set value.
When the water supply pressure set value reaches the limit value in the priority execution mode of the variable water amount control, the switch is switched to the priority execution mode of the variable water supply temperature control, and the water supply temperature set value is changed in the priority execution mode of the variable water supply temperature control. A load-responsive air-conditioning control system comprising a control switching unit configured to switch to the priority execution mode of the water change amount control when the limit value is reached. In the load response type air conditioning control system according to claim 1,
A control valve configured to regulate the flow rate of cold and hot water passing through the air conditioner,
Further, a valve opening degree control unit configured to control the opening degree of the control valve so that the temperature of the supply air supplied from the air conditioner and the supply air temperature set value match is further provided.
The first control state determination unit is a load response type air conditioning control system characterized in that the control state of the air conditioner is determined based on the opening degree of the control valve and the temperature of the supply air. In the load response type air conditioning control system according to claim 1 or 2.
A plurality of the air conditioners are provided,
Further, a second control state determination unit configured to determine a total control state in which the control states determined for each air conditioner by the first control state determination unit are integrated into one is further provided.
The water supply pressure setting unit sets the water supply pressure set value of the cold / hot water according to the air conditioning load represented by the total control state in the priority execution mode of the water change amount control.
The load response type air conditioning control system is characterized in that the water supply temperature setting unit sets a water supply temperature setting value of the cold / hot water according to the air conditioning load represented by the total control state in the priority execution mode of the variable water supply temperature control. .. In the load response type air conditioning control system according to claim 3,
The load response type air conditioning control characterized in that the second control state determination unit determines the total control state by a majority determination process of the control state determined for each air conditioner by the first control state determination unit. system. In the load response type air conditioning control system according to any one of claims 1 to 4.
The control switching unit switches to the priority execution mode of the variable water temperature control when the water supply pressure set value reaches the lower limit value in the priority execution mode of the variable water amount control, and in the priority execution mode of the variable water temperature control. When the water supply temperature set value in the cooling operation reaches the lower limit value during the cooling operation, or when the water supply temperature set value in the heating operation reaches the upper limit value during the heating operation, priority is given to the water change amount control. A load-responsive air-conditioning control system characterized by switching to execution mode. In the load response type air conditioning control system according to claim 5.
The water supply pressure setting unit fixes the water supply pressure set value to the lower limit value when the priority execution mode of the water change amount control is switched to the non-priority execution mode.
The water supply temperature setting unit is characterized in that when the priority execution mode of the variable water supply temperature control is switched to the non-priority execution mode, the water supply temperature setting value is fixed to the lower limit value during cooling operation or the upper limit value during heating operation. Load-responsive air conditioning control system. The first step of determining the control status of the air conditioner and
The second step of setting the feed pressure set value of the cold / hot water supplied to the air conditioner according to the air conditioning load represented by the control state in the priority execution mode of the water change amount control, and
The third step of fixing the water supply pressure set value in the non-priority execution mode of the water change amount control, and
A fourth step of controlling the pump for supplying the cold / hot water to the air conditioner so that the water supply pressure of the cold / hot water matches the water supply pressure set value.
The fifth step of setting the water supply temperature setting value of the cold / hot water according to the air conditioning load in the priority execution mode of the variable water supply temperature control, and
The sixth step of fixing the water supply temperature set value in the non-priority execution mode of the variable water supply temperature control, and
A seventh step of controlling the heat source machine from which the cold / hot water is generated so that the water supply temperature of the cold / hot water matches the water supply temperature set value.
The eighth step of switching to the priority execution mode of the variable water temperature control when the water supply pressure set value reaches the limit value in the priority execution mode of the variable water amount control, and
A load response type air conditioning control including a ninth step of switching to the priority execution mode of the water change amount control when the water supply temperature set value reaches the limit value in the priority execution mode of the variable water temperature control. Method. In the load response type air conditioning control method according to claim 7.
The tenth step of controlling the opening degree of the control valve for adjusting the flow rate of the cold / hot water passing through the air conditioner so that the temperature of the supply air supplied from the air conditioner and the supply air temperature set value match. Including more
The first step is a load response type air conditioning control method including a step of determining a control state of the air conditioner based on an opening degree of the control valve and a temperature of the supply air. In the load response type air conditioning control method according to claim 7 or 8.
The eleventh step of determining the total control state in which the control states determined for each air conditioner by the first step are integrated into one is further provided.
The second step includes a step of setting a water supply pressure set value of the cold / hot water according to the air conditioning load represented by the total control state in the priority execution mode of the water change amount control.
The fifth step is a load response type including a step of setting a water supply temperature set value of the cold / hot water according to the air conditioning load represented by the total control state in the priority execution mode of the variable water supply temperature control. Air conditioning control method. In the load response type air conditioning control method according to claim 9,
The eleventh step is a load response type air conditioning control method comprising a step of determining the total control state by a majority determination process of the control state determined for each air conditioner by the first step. In the load response type air conditioning control method according to any one of claims 7 to 10.
The eighth step includes a step of switching to the priority execution mode of the variable water temperature control when the water supply pressure set value reaches the lower limit value in the priority execution mode of the water change amount control.
In the ninth step, when the water supply temperature set value in the cooling operation reaches the lower limit value in the cooling operation in the priority execution mode of the variable water supply temperature control, or when the water supply temperature set value in the heating operation is set. A load-responsive air-conditioning control method comprising a step of switching to the priority execution mode of the water change amount control when the upper limit value during heating operation is reached. In the load response type air conditioning control method according to claim 11,
The third step includes a step of fixing the water supply pressure set value to a lower limit value when the priority execution mode of the water change amount control is switched to the non-priority execution mode.
The sixth step includes a step of fixing the water supply temperature set value to the lower limit value during cooling operation or the upper limit value during heating operation when the priority execution mode of the variable water supply temperature control is switched to the non-priority execution mode. A load-responsive air conditioning control method characterized by.

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