JP2016102635A - Air conditioner system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system showing a superior energy saving characteristic in which cold heat and/or hot heat is supplied from a circulating fluid circulated by a pump to a heat source machine of an air conditioner.SOLUTION: An air conditioning system 100 comprises a variable capacity pump 20; a cooling tower 80 and a boiler 90; a plurality of air conditioner devices 30; a plurality of flow rate adjuster valves 35; and a controller 70. The pump circulates the circulating fluid. The cooling tower cools the circulating fluid. The boiler heats the circulating fluid. Each of a plurality of air conditioner devices has a refrigerant circuit including heat source machines 40 for receiving cold heat and hot heat from the circulating fluid. The flow rate adjuster valve is arranged in correspondence with each of the heat source machines to cause an amount of circulating fluid flowing in its corresponding heat source machine to be variable. The controller adjusts a capacity of pump on the basis of the state of the flow rate adjuster valve.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioning system, and more specifically, to an air conditioning system in which cold and / or warm heat is supplied from a circulating fluid circulated by a pump to a heat source device of an air conditioner.

  Conventionally, a circulating fluid cooled / heated by a cooling tower / boiler is circulated by a pump as in Patent Document 1 (Japanese Patent Laid-Open No. Hei 8-210667), and the cooling fluid and / or the thermal energy from the circulating fluid to the heat source unit of the air conditioner. Air conditioning systems are known.

  The present inventor has found that in such an air conditioning system, conventionally, the flow rate of the circulating fluid cooled / heated by the cooling tower / boiler has not been controlled, and energy may be wasted depending on the air conditioning load. I found it.

  An object of the present invention is to provide an air conditioning system that is provided with cold energy and / or warm heat from a circulating fluid that is circulated by a pump to a heat source device of an air conditioner, and that is excellent in energy saving.

  An air conditioning system according to a first aspect of the present invention includes a variable capacity pump, at least one of a cooling tower and a boiler, a plurality of air conditioners, a plurality of flow rate variable mechanisms, and a pump adjustment unit. The pump circulates the circulating fluid. The cooling tower cools the circulating fluid. The boiler heats the circulating fluid. Each of the plurality of air conditioners has a refrigerant circuit including a heat source device that receives cold and / or warm heat from the circulating fluid. The flow rate variable mechanism is provided corresponding to each heat source device, and makes the amount of circulating fluid flowing to the corresponding heat source device variable. The pump adjustment unit adjusts the capacity of the pump based on the state of the flow rate variable mechanism.

  In the air conditioning system according to the first aspect of the present invention, since a variable flow rate mechanism is provided that makes the amount of circulating fluid flowing through the heat source unit variable, the amount of circulating fluid flowing through the heat source unit can be controlled according to the air conditioning load. is there. Here, the capacity of the pump that circulates the circulating fluid is adjusted according to the state of the flow rate variable mechanism. That is, here, according to the air conditioning load, the capacity of the pump, that is, the power of the pump can be appropriately controlled. Therefore, it is possible to realize an air conditioning system with excellent energy saving performance as compared with a conventional air conditioning system in which the amount of circulating fluid is not adjusted according to the air conditioning load.

  The air conditioning system which concerns on the 2nd viewpoint of this invention is an air conditioning system which concerns on a 1st viewpoint, Comprising: Each air conditioner respond | corresponds to the heat source apparatus which this air conditioner has, The flow rate variable mechanism and the circulating fluid which flows into a heat source apparatus It further has a flow rate variable mechanism adjustment unit for instructing the change of the amount.

  In the air conditioning system according to the second aspect of the present invention, each air conditioner directly instructs the flow rate variable mechanism corresponding to the heat source unit included in the air conditioner to change the amount of the circulating fluid flowing to the heat source unit. The amount of circulating fluid flowing to the machine can be adjusted with good responsiveness.

  An air conditioning system according to a third aspect of the present invention is the air conditioning system according to the second aspect, wherein the flow rate variable mechanism adjustment unit is configured to control high pressure and / or low pressure in a refrigerant circuit of an air conditioner having the flow rate variable mechanism adjustment unit. Based on the value, the variable flow mechanism is instructed to change the amount of circulating fluid flowing to the heat source unit.

  In the air conditioning system according to the third aspect of the present invention, since the flow variable mechanism is instructed based on the high pressure and / or low pressure values in the refrigerant circuit of the air conditioner, the amount of circulating fluid flowing through the heat source unit is used as the air conditioning load. It is easy to change appropriately.

  The air conditioning system which concerns on the 4th viewpoint of this invention is an air conditioning system which concerns on either of the 1st viewpoint to the 3rd viewpoint, Comprising: A flow variable mechanism has a valve body, and changes the opening degree of a valve body. The amount of circulating fluid flowing to the heat source machine is variable. The pump adjustment unit is a flow rate variable mechanism corresponding to the heat source apparatus in operation, and adjusts to reduce the pump capacity when the flow rate variable mechanism having a valve element opening degree smaller than the first predetermined value exists. .

  In the air conditioning system according to the fourth aspect of the present invention, the pump capacity is reduced when the opening degree of the valve body of the flow rate variable mechanism corresponding to the heat source device in operation is below a predetermined value, so that the power of the pump is unnecessary. Therefore, it is possible to realize an air conditioning system that is excellent in energy saving.

  An air conditioning system according to a fifth aspect of the present invention is the air conditioning system according to the fourth aspect, and at the time of starting each heat source machine that has been stopped, the opening degree of the valve body of the flow rate variable mechanism corresponding to the heat source machine is The pump adjustment unit increases the pump capacity by a predetermined amount and maintains the increased pump capacity for a predetermined period.

  In the air conditioning system according to the fifth aspect of the present invention, when the heat source unit is started, the opening degree of the valve body of the flow rate variable mechanism corresponding to the heat source unit is set to 100%, and the capacity of the pump corresponds to the start of the heat source unit. Therefore, it is easy to stabilize the operation of the air conditioning system when the heat source unit is started up.

  An air conditioning system according to a sixth aspect of the present invention is the air conditioning system according to the fourth aspect, and when each heat source machine that has been operating is stopped, the opening degree of the valve body of the flow rate variable mechanism corresponding to the heat source machine is The pump adjusting unit reduces the pump capacity by a predetermined amount.

  In the air conditioning system according to the sixth aspect of the present invention, when the heat source unit is stopped, the opening degree of the valve body of the flow rate variable mechanism corresponding to the heat source unit is set to 0%, and the capacity of the pump corresponds to the stop of the heat source unit. Therefore, the energy saving performance of the air conditioning system can be improved.

  An air conditioning system according to a seventh aspect of the present invention is the air conditioning system according to any one of the first to sixth aspects, wherein the refrigerant circuit exchanges heat between the refrigerant cooled or heated by the heat source unit and the air. It further includes a use side heat exchanger.

  In the air conditioning system according to the seventh aspect of the present invention, the amount of circulating fluid flowing to the heat source unit of the air conditioner is used even when an air conditioner of the type that directly exchanges heat between the refrigerant and the air in the air conditioning target space is used. It is possible to realize an air-conditioning system with excellent energy saving while adjusting properly.

  In the air conditioning system according to the first aspect, since a variable flow rate mechanism is provided that makes the amount of circulating fluid flowing through the heat source device variable, the amount of circulating fluid flowing through the heat source device can be controlled according to the air conditioning load. Here, the capacity of the pump that circulates the circulating fluid is adjusted according to the state of the flow rate variable mechanism. That is, here, according to the air conditioning load, the capacity of the pump, that is, the power of the pump can be appropriately controlled. Therefore, it is possible to realize an air conditioning system with excellent energy saving performance as compared with a conventional air conditioning system in which the amount of circulating fluid is not adjusted according to the air conditioning load.

  In the air conditioning system according to the second aspect, the amount of circulating fluid flowing through the heat source unit of the air conditioner can be adjusted with good responsiveness.

  In the air conditioning system according to the third aspect, it is easy to appropriately change the amount of the circulating fluid flowing through the heat source unit of the air conditioner according to the air conditioning load.

  In the air conditioning system according to the fourth aspect, an air conditioning system excellent in energy saving can be realized.

  In the air conditioning system according to the fifth aspect, it is easy to stabilize the operation of the air conditioning system when the heat source device is started.

  In the air conditioning system according to the sixth aspect, the energy saving performance of the air conditioning system can be improved.

  In the air conditioning system according to the seventh aspect, even if a type of air conditioner that directly exchanges heat between the refrigerant and the air in the air conditioning target space is used, the amount of circulating fluid flowing through the heat source unit of the air conditioner is appropriately set. Adjustable and energy-saving air conditioning system can be realized.

It is a schematic block diagram of the air conditioning system which concerns on this embodiment. It is a schematic block diagram of the air conditioner which the air conditioning system of FIG. 1 has. It is a flowchart explaining the control (at the time of air_conditionaing | cooling operation) of the opening degree of the valve body of the flow regulating valve at the time of normal operation in the air conditioner which the air conditioning system of FIG. 1 has. It is a flowchart explaining the control (at the time of heating operation) of the opening degree of the valve body of the flow regulating valve at the time of normal operation in the air conditioner included in the air conditioning system of FIG. It is a flowchart explaining the capacity | capacitance adjustment control of the pump at the time of starting of any heat source machine in the air conditioning system of FIG. 2 is a flowchart illustrating pump capacity adjustment control during normal operation in the air conditioning system of FIG. 1.

  An air conditioning system 100 according to an embodiment of the present invention will be described with reference to the drawings.

  The following embodiments are merely examples, and can be appropriately changed without departing from the gist of the present invention.

(1) Overall Configuration The air conditioning system 100 according to the present embodiment is an air conditioning system installed in a building or the like. The air conditioning system 100 is used for cooling and heating of a building or the like in which the air conditioning system 100 is installed. However, the present invention is not limited to this, and the air conditioning system 100 may be used only for cooling or heating of a building or the like in which the air conditioning system 100 is installed.

  The air conditioning system 100 mainly includes a pipe 21, a cooling tower 80, a boiler 90, a pump 20, a plurality of air conditioners 30, and a controller 70 (see FIG. 1). In FIG. 1, the number of air conditioners 30 is three, but the number of air conditioners 30 is not limited to this, and may be two or four or more.

  The cooling tower 80 is installed on the rooftop of a building or the like where the air conditioning system 100 is installed, for example. The boiler 90 is installed in a machine room such as a building where the air conditioning system 100 is installed, for example. The pipe 21 is a pipe for carrying the circulating fluid cooled to a predetermined temperature by the cooling tower 80 or the circulating fluid heated to the predetermined temperature by the boiler 90 to the heat source unit 40 of the air conditioner 30 described later. . The pipe 20 is provided with a pump 20. The pump 20 circulates the circulating fluid in the fluid circuit 22 configured by the cooling tower 80 or the boiler 90, the pipe 21, and the heat source device 40 of the air conditioner 30. Here, water is used as the circulating fluid, but is not limited thereto. For example, instead of water, brine or the like may be used as the circulating fluid.

  Each air conditioner 30 includes a heat source device 40, a plurality of indoor units 50, and a flow rate adjustment valve 35 (see FIG. 1). The heat source device 40 is installed, for example, in a machine room on each floor such as a building where the air conditioning system 100 is installed. The indoor unit 50 is installed in an air-conditioning target space to be air-conditioned. As will be described later, the heat source unit 40 and the indoor unit 50 are connected by a refrigerant pipe to form a refrigerant circuit 31 (see FIG. 2). In the air conditioner 30, the refrigerant flows through the refrigerant circuit 31, and the vapor compression refrigeration cycle is performed, whereby the air-conditioning target space is cooled or heated. The heat source device 40 is connected to the pipe 21. In the heat source unit 40, heat exchange is performed between the refrigerant flowing through the refrigerant circuit 31 and the circulating fluid flowing through the pipe 21 to the heat source unit 40, and the refrigerant is cooled or heated by the circulating fluid. The flow rate adjustment valve 35 is provided in the pipe 21. The flow rate adjustment valve 35 is provided corresponding to the heat source device 40 and adjusts the amount of circulating fluid flowing through the heat source device 40.

  The controller 70 mainly controls the cooling tower 80, the boiler 90, and the pump 20.

(2) Detailed configuration The pipe 21, the pump 20, the air conditioner 30, and the controller 70 will be described in detail.

(2-1) Piping The piping 21 is connected to the cooling tower 80 and the boiler 90 (see FIG. 1). Moreover, the piping 21 is connected with the heat-source equipment 40 which each of the some air conditioner 30 has (refer FIG. 1). More specifically, the pipe 21 is connected to the heat source side heat exchanger 43 of each heat source unit 40 so that the circulating fluid passes through the heat source side heat exchanger 43 of each heat source unit 40 (see FIG. 2). ).

  The pipe 21 is provided with a pump 20 for transporting the circulating fluid cooled by the cooling tower 80 or the circulating fluid heated by the boiler 90 to the heat source unit 40 (see FIG. 1). Moreover, the flow rate adjustment valve 35 which each air conditioner 30 has is provided in the piping 21 in the upstream of the circulation fluid inlet_port | entrance of each heat-source equipment 40 (refer FIG. 1).

(2-2) Pump The pump 20 is provided in the pipe 21, and circulates fluid in the fluid circuit 22 including the cooling tower 80 or the boiler 90, the pipe 21, and the heat source unit 40 of the air conditioner 30. Circulate. The pump 20 carries the circulating fluid cooled by the cooling tower 80 to the heat source unit 40 and returns it to the cooling tower 80 again, or carries the circulating fluid heated by the boiler 90 to the heat source unit 40 and returns to the boiler 90 again. It works to bring it back.

  The pump 20 is a variable capacity inverter pump. The pump 20 is configured to change the capacity (liquid feeding amount) by changing the rotation speed of a motor (not shown). The capacity of the pump 20, in other words, the rotational speed of the motor is controlled by the controller 70.

(2-3) Air Conditioner The air conditioner 30 is a device that cools or heats the air conditioning target space.

  The air conditioner 30 mainly includes a heat source device 40, a plurality of indoor units 50, a flow rate adjustment valve 35, and an air conditioning controller 49 (see FIG. 2). In FIG. 2, the number of indoor units 50 is two, but the number of indoor units 50 is not limited to this, and may be three or more. The number of indoor units 50 may not be plural.

  In the air conditioner 30, the heat source unit 40 and the indoor unit 50 are connected by a liquid refrigerant communication pipe 33 and a gas refrigerant communication pipe 32 to constitute a refrigerant circuit 31 (see FIG. 2). More specifically, in the air conditioner 30, the compressor 41 of the heat source unit 40, the heat source side heat exchanger 43, and the heat source side expansion valve 44, which will be described later, by the liquid refrigerant communication pipe 33 and the gas refrigerant communication pipe 32, A use side heat exchanger 51 and an indoor side expansion valve 53 of the indoor unit 50 to be described later are connected to constitute the refrigerant circuit 31.

(2-3-1) Indoor Units Each indoor unit 50 is installed in a space (for example, each room of a building or the like in which the air conditioning system 100 is installed) targeted by the indoor unit 50.

  The indoor unit 50 mainly includes a use-side heat exchanger 51, a fan 52, and an indoor-side expansion valve 53.

  The use side heat exchanger 51 exchanges heat between the refrigerant cooled or heated by the heat source device 40 and the room air. The use-side heat exchanger 51 functions as an evaporator that evaporates the refrigerant during the cooling operation of the air conditioner 30 and cools indoor air. The use-side heat exchanger 51 functions as a condenser that condenses the refrigerant during the heating operation of the air conditioner 30, and heats indoor air. The liquid side of the use side heat exchanger 51 is connected to the liquid refrigerant communication pipe 33, and the gas side of the use side heat exchanger 51 is connected to the gas refrigerant communication pipe 32.

  The fan 52 is rotated by a fan motor (not shown), thereby taking in indoor air and blowing it to the use side heat exchanger 51. The fan 52 promotes heat exchange between the refrigerant flowing through the use side heat exchanger 51 and room air.

  The indoor side expansion valve 53 is provided in a refrigerant pipe connecting the liquid side of the use side heat exchanger 51 and the liquid refrigerant communication pipe 33. The indoor side expansion valve 53 is an example of an expansion mechanism, and is an electric expansion valve with a variable opening provided for adjusting the flow rate of the refrigerant flowing through the use side heat exchanger 51.

(2-3-2) Heat source machine The heat source machine 40 mainly has a compressor 41, a four-way switching valve 42, a heat source side heat exchanger 43, and a heat source side expansion valve 44 as shown in FIG.

  The compressor 41, the four-way switching valve 42, the heat source side heat exchanger 43, and the heat source side expansion valve 44 are connected by a refrigerant pipe. Specifically, the suction port of the compressor 41 and the four-way switching valve 42 are connected by a suction pipe 45a (see FIG. 2). The discharge port of the compressor 41 and the four-way switching valve 42 are connected by a discharge pipe 45b (see FIG. 2). The four-way switching valve 42 and the gas side of the heat source side heat exchanger 43 are connected by a first gas refrigerant pipe 45c (see FIG. 2). The heat source side heat exchanger 43 and the liquid refrigerant communication pipe 33 are connected by a liquid refrigerant pipe 45d (see FIG. 2). The liquid refrigerant pipe 45d is provided with a heat source side expansion valve 44 (see FIG. 2). The four-way switching valve 42 and the gas refrigerant communication pipe 32 are connected by a second gas refrigerant pipe 45e (see FIG. 2).

  The compressor 41 drives a compression mechanism with a motor (not shown), thereby sucking low-pressure gas refrigerant from the suction pipe 45a and discharging high-pressure gas refrigerant compressed by the compression mechanism to the discharge pipe 45b. The compressor 41 is a variable capacity inverter type compressor. Although the compressor 41 is a rotary compressor, it is not limited to this, For example, a scroll compressor may be sufficient.

  The four-way switching valve 42 switches the flow direction of the refrigerant when the air conditioner 30 is switched between the cooling operation and the heating operation. During the cooling operation, the discharge pipe 45b and the first gas refrigerant pipe 45c are connected, and the suction pipe 45a and the second gas refrigerant pipe 45e are connected (see the solid line in FIG. 2). On the other hand, during the heating operation, the discharge pipe 45b and the second gas refrigerant pipe 45e are connected, and the suction pipe 45a and the first gas refrigerant pipe 45c are connected (see the broken line in FIG. 2).

  The heat source side heat exchanger 43 performs heat exchange between the refrigerant flowing in the refrigerant circuit 31 and the circulating fluid flowing in the fluid circuit 22. In the heat source side heat exchanger 43, the liquid refrigerant pipe 45d is connected to the liquid side of the flow path through which the refrigerant flows, and the first gas refrigerant pipe 45c is connected to the gas side of the flow path through which the refrigerant flows (see FIG. 2). . Moreover, the piping 21 is connected to the heat source side heat exchanger 43 (refer FIG. 2). A flow rate adjustment valve 35 is provided on the upstream side of the heat source side heat exchanger 43 in the flow direction of the circulating fluid in the pipe 21. The heat source side heat exchanger 43 functions as a condenser that condenses the refrigerant by receiving cold heat from the circulating fluid during the cooling operation. The heat source side heat exchanger 43 functions as an evaporator that evaporates the refrigerant by receiving the supply of warm heat from the circulating fluid during the heating operation.

  The heat source side expansion valve 44 is an expansion mechanism for decompressing the refrigerant. The heat source side expansion valve 44 is an electric expansion valve with variable opening.

(2-3-3) Flow Control Valve The flow control valve 35 is an example of a flow rate variable mechanism. The flow rate adjustment valve 35 is provided corresponding to the heat source device 40 (see FIG. 1). Specifically, the flow rate adjustment valve 35 is provided on the upstream side of the inlet of the circulating fluid of each heat source device 40, in other words, on the upstream side of the heat source side heat exchanger 43 in the flow direction of the circulating fluid (FIG. 2). reference). The flow rate adjusting valve 35 is an electric valve with a variable opening that makes the amount of circulating fluid flowing to the heat source device 40, specifically, the amount of circulating fluid flowing to the heat source side heat exchanger 43 variable. The flow rate adjusting valve 35 changes the amount of circulating fluid flowing through the heat source side heat exchanger 43 by changing the opening degree Op of the valve body 35a (see FIG. 2). The opening degree Op of the valve body 35a is controlled by an air conditioning controller 49 described later.

(2-3-4) Air-conditioning controller The air-conditioning controller 49 includes a CPU, a memory such as a RAM and a ROM, and the like. The air conditioning controller 49 is electrically connected to each component of the air conditioner 30, for example, the fan 52, the indoor side expansion valve 53, the compressor 41, the four-way switching valve 42, the heat source side expansion valve 44, and the flow rate adjustment valve 35. Yes. The air conditioning controller 49 is configured to be able to communicate with the controller 70 (see FIG. 1).

  The air conditioner controller 49 controls the air conditioner 30 by the CPU reading and executing the program stored in the memory. The air conditioning controller 49 exchanges control signals with a remote controller (not shown) for operating the indoor unit 50. The air conditioning controller 49 is based on commands (for example, operation / stop of the indoor unit 50, operation mode (cooling / heating), set temperature, etc.) input to the remote controller, measurement values of various sensors of the air conditioner 30 (not shown), and the like. Thus, various configurations of the air conditioner 30 such as the fan 52, the indoor side expansion valve 53, the compressor 41, the four-way switching valve 42, the heat source side expansion valve 44, and the flow rate adjustment valve 35 are controlled.

  The air conditioning controller 49 controls various configurations of the air conditioner 30 according to the air conditioning load of the air conditioner 30 (total capacity required for cooling / heating the air conditioning target space).

  For example, during the cooling operation of the air conditioner 30, the air conditioning controller 49 determines the optimum high pressure P1 at which the COP (coefficient of performance) of the refrigeration cycle in the refrigerant circuit 31 is highest according to the air conditioning load. Note that the air conditioning controller 49 actually determines the optimum condensation temperature Tc1 corresponding to the optimum high pressure P1. The air conditioning controller 49 adjusts the opening degree Op of the flow rate adjustment valve 35 and controls the amount of circulating fluid flowing to the heat source side heat exchanger 43, so that the condensation temperature Tc (the refrigerant temperature in the heat source side heat exchanger 43) is increased. Control is performed to achieve the optimum condensation temperature Tc1. In addition, during the heating operation of the air conditioner 30, the air conditioning controller 49 determines the optimum low pressure P2 at which the COP of the refrigeration cycle in the refrigerant circuit 31 is highest according to the air conditioning load. Note that the air conditioning controller 49 actually determines the optimum evaporating temperature Te1 corresponding to the optimum low pressure P2. The air conditioning controller 49 adjusts the opening degree Op of the flow rate adjustment valve 35 and controls the amount of circulating fluid flowing to the heat source side heat exchanger 43, whereby the evaporation temperature Te (refrigerant temperature in the heat source side heat exchanger 43) is set. Control is performed so that the optimum evaporation temperature Te1 is reached. The control of the flow rate adjustment valve 35 by the air conditioning controller 49 will be described in detail later.

(2-4) Controller The controller 70 includes a CPU, a memory such as a RAM and a ROM, and the like. The controller 70 is electrically connected to the cooling tower 80, the boiler 90, and the pump 20. The controller 70 is configured to be able to communicate with each air conditioning controller 49. The controller 70 receives information regarding the operating status of each air conditioner 30 from each air conditioner controller 49. Examples of information related to the operating status of the air conditioner 30 include information relating to operation / stop of the heat source device 40, information relating to the air conditioning load of the air conditioner 30, information relating to the operation mode (heating / cooling mode) of the air conditioner 30, and a flow rate adjustment valve. The information regarding the state of 35 (information regarding the opening degree Op of the valve body 35a of the flow regulating valve 35) and the like are included.

  The controller 70 controls the cooling tower 80, the boiler 90, and the pump 20 by the CPU reading and executing the program stored in the memory. The controller 70 controls the cooling tower 80, the boiler 90, and the pump 20 based on the information regarding the operation status of the air conditioner 30 received from the air conditioning controller 49.

  For example, the controller 70 instructs the cooling tower 80 to operate when it is necessary to provide cold heat to the heat source unit 40 based on information on the operation mode of the air conditioner 30 or information on the air conditioning load of the air conditioner 30. When it is necessary to provide heat to the heat source device 40, the boiler 90 is instructed to operate. Further, the controller 70 determines the capacity of the pump 20 (the number of rotations of the motor of the pump 20) based on information related to the start / stop of the heat source device 40, information related to the opening Op of the valve body 35a of the flow rate adjustment valve 35, and the like. Execute the control to be adjusted. The capacity adjustment control of the pump 20 by the controller 70 will be described in detail later.

(3) Control of Flow Control Valve and Pump Hereinafter, control of the opening Op of the valve body 35a of the flow control valve 35 executed by the air conditioning controller 49 and capacity adjustment control of the pump 20 executed by the controller 70 will be described. .

(3-1) Control of Opening of Valve Body of Flow Control Valve The control of the opening Op of the valve body 35a of the flow control valve 35 executed by the air conditioning controller 49 will be described. In other words, the function of the air conditioning controller 49 as the flow rate variable mechanism adjustment unit that instructs the flow rate adjustment valve 35 to change the amount of circulating fluid flowing to the heat source device 40 will be described.

  Regarding the control of the opening degree Op of the valve element 35a of the flow rate adjustment valve 35 executed by the air conditioning controller 49, (a) when the heat source device 40 is started, (b) when the heat source device 40 is stopped, and (c) the heat source device 40. The normal operation (except when the heat source device 40 is started / stopped) will be described separately.

(A) At the time of starting the heat source unit The air conditioning controller 49 is a valve element of the flow rate adjusting valve 35 corresponding to the heat source unit 40 when the heat source unit 40 is started, more specifically, when the compressor 41 of the heat source unit 40 is started. The opening Op of 35a is controlled to 100%. In other words, the air conditioning controller 49 fully opens the valve body 35a of the flow rate adjustment valve 35 corresponding to the heat source device 40 when the heat source device 40 is started.

(B) When the heat source unit is stopped The air conditioner controller 49 is configured such that when the heat source unit 40 is stopped, more specifically, when the compressor 41 of the heat source unit 40 is stopped, the valve body of the flow rate adjusting valve 35 corresponding to the heat source unit 40. The opening Op of 35a is controlled to 0%. In other words, the air conditioning controller 49 fully closes the valve body 35a of the flow rate adjustment valve 35 corresponding to the heat source device 40 when the heat source device 40 is stopped.

(C) During normal operation of the heat source unit Flow rate during normal operation of the air conditioning controller 49 (from the end of the control in (a) until the heat source unit 40 is stopped and the control in (b) is executed) Control of the opening degree Op of the valve body 35a of the regulating valve 35 will be described with reference to FIGS. 3A and 3B.

  First, the control of the opening degree Op of the valve body 35a of the flow rate adjustment valve 35 during the normal operation during the cooling operation of the air conditioner 30 will be described based on FIG. 3A.

  First, in step S1, the air conditioning controller 49 determines the air conditioning load of the air conditioner 30 based on the set temperature of each indoor unit 50, the temperature of the air conditioning target space of each indoor unit 50 detected by a temperature sensor (not shown), and the like. The capacity required in the indoor unit 50 is calculated. In addition, the air conditioning controller 49 acquires the temperature of the circulating fluid flowing into the heat source device 40. Then, the air conditioning controller 49 determines the optimum high pressure P1 (high pressure in the refrigeration cycle) at which the COP (coefficient of performance) of the refrigeration cycle in the refrigerant circuit 31 is the highest. Note that the air conditioning controller 49 actually determines the optimum condensation temperature Tc1 corresponding to the optimum high pressure P1.

  Next, in step S2, the air conditioning controller 49 determines whether or not the high pressure in the current refrigeration cycle is greater than the optimum high pressure P1. The air conditioning controller 49 actually determines whether the refrigerant temperature (actual condensation temperature Tc) in the heat source side heat exchanger 43 detected by a temperature sensor (not shown) is higher than the optimum condensation temperature Tc1 corresponding to the optimum high pressure P1. Determine whether. The air-conditioning controller 49 proceeds to step S3 when it is determined that the condensation temperature Tc> the optimum condensation temperature Tc1, and proceeds to step S4 when it is determined that the actual condensation temperature Tc ≦ the optimum condensation temperature Tc1.

  In step S <b> 3, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to increase the amount of circulating fluid flowing to the heat source device 40. Specifically, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to increase the opening degree Op of the valve body 35a. For example, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to increase the opening Op of the valve body 35a by a predetermined amount (for example, 10%). However, the present invention is not limited to this, and the air conditioning controller 49 causes the flow rate adjustment valve 35 to increase the opening Op of the valve body 35a to an appropriate opening calculated based on the air conditioning load of the indoor unit 50. You may instruct. After step S3, the process proceeds to step S6.

  In step S4, the air conditioning controller 49 determines whether or not the high pressure in the current refrigeration cycle is smaller than the optimum high pressure P1. The air conditioning controller 49 actually determines whether or not the refrigerant temperature (condensation temperature Tc) in the heat source side heat exchanger 43 is lower than the optimum condensation temperature Tc1 corresponding to the optimum high pressure P1. If the air conditioning controller 49 determines that the condensation temperature Tc <the optimum condensation temperature Tc1, the process proceeds to step S5. On the other hand, if it is determined that the condensation temperature Tc = the optimum condensation temperature Tc1, the process proceeds to step S6.

  In step S <b> 5, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to reduce the amount of circulating fluid flowing to the heat source device 40. Specifically, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to reduce the opening degree Op of the valve body 35a. As in step S3, the air conditioning controller 49 may instruct the flow rate adjustment valve 35 to decrease the opening Op of the valve body 35a by a predetermined amount, for example. The air conditioning controller 49 may instruct the flow rate adjustment valve 35 to reduce the opening Op of the valve body 35a to an appropriate opening calculated based on the air conditioning load of the indoor unit 50. After step S5 ends, the process proceeds to step S6.

  In step S <b> 6, the air conditioning controller 49 transmits the opening degree Op of the valve body 35 a of the flow rate adjustment valve 35 to the controller 70. Here, the opening Op transmitted to the controller 70 is the opening Op of the valve body 35a after the change when the opening Op of the valve body 35a is changed in Step S3 or Step S5. is there.

  After step S6 ends, the process returns to step S1. This series of steps is repeated until the heat source device 40 is stopped.

  Next, control of the opening degree Op of the valve body 35a of the flow rate adjustment valve 35 during normal operation during the heating operation of the air conditioner 30 will be described based on FIG. 3B.

  In step S <b> 11, the air conditioning controller 49 calculates the air conditioning load of the air conditioner 30 as in step S <b> 1. In addition, the air conditioning controller 49 acquires the temperature of the circulating fluid flowing into the heat source device 40. Then, the air conditioning controller 49 determines the optimum low pressure P2 (low pressure in the refrigeration cycle) at which the COP of the refrigeration cycle in the refrigerant circuit 31 is the highest. Note that the air conditioning controller 49 actually determines the optimum evaporating temperature Te1 corresponding to the optimum low pressure P2.

  Next, in step S12, the air conditioning controller 49 determines whether or not the low pressure in the current refrigeration cycle is greater than the optimum low pressure P2. In actuality, the air conditioning controller 49 determines whether or not the refrigerant temperature (actual evaporation temperature Te) in the heat source side heat exchanger 43 detected by a temperature sensor (not shown) is higher than the optimum evaporation temperature Te1 corresponding to the optimum low pressure P2. Determine whether. The air conditioning controller 49 proceeds to step S13 when determining that the evaporation temperature Te> optimum evaporation temperature Te1, and proceeds to step S14 when determining that the actual evaporation temperature Te ≦ optimum evaporation temperature Te1.

  In step S <b> 13, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to reduce the amount of circulating fluid flowing to the heat source device 40. Specifically, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to reduce the opening degree Op of the valve body 35a. Since the contents of the instruction are the same as in step S5 during the cooling operation, the description thereof is omitted. After step S13 ends, the process proceeds to step S16.

  In step S14, the air conditioning controller 49 determines whether or not the low pressure in the current refrigeration cycle is smaller than the optimum low pressure P2. The air conditioning controller 49 actually determines whether the refrigerant temperature (evaporation temperature Te) in the heat source side heat exchanger 43 is lower than the optimum evaporation temperature Te1 corresponding to the optimum low pressure P2. If the air conditioning controller 49 determines that the evaporation temperature Te <the optimum evaporation temperature Te1, the process proceeds to step S15. On the other hand, if it is determined that the evaporation temperature Te = optimum evaporation temperature Te1, the process proceeds to step S16.

  In step S <b> 15, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to increase the amount of circulating fluid flowing to the heat source device 40. Specifically, the air conditioning controller 49 instructs the flow rate adjustment valve 35 to increase the opening degree Op of the valve body 35a. Since the contents of the instruction are the same as those in step S3 during the cooling operation, description thereof will be omitted. After step S15 ends, the process proceeds to step S16.

  In step S16, the air-conditioning controller 49 opens the opening degree Op of the valve body 35a of the flow rate adjustment valve 35 (if the opening degree Op of the valve body 35a has been changed in step S13 or step S15, the changed valve body 35a. Is transmitted to the controller 70.

  After step S16 ends, the process returns to step S11. This series of steps is repeated until the heat source device 40 is stopped.

(3-2) Capacity Adjustment Control of Pump The capacity adjustment control of the pump 20 executed by the controller 70 will be described. In other words, the function of the controller 70 as a pump adjustment unit that adjusts the capacity of the pump 20 based on the state of the flow rate adjustment valve 35 will be described.

  Regarding the capacity adjustment control of the pump 20 executed by the controller 70, (a) when any one of the heat source devices 40 is started, (b) when any one of the heat source devices 40 is stopped, and (c) normal operation of the heat source device 40. The explanation will be divided into cases.

(A) When any one of the heat source devices 40 is activated The controller 70 receives a signal from any one of the air conditioning controllers 49 that the stopped heat source device 40 has been activated (more specifically, the heat source device that has been deactivated). The capacity adjustment control of the pump 20 when a signal indicating that the 40 compressors 41 are activated will be described with reference to FIG. 4A.

  When the controller 70 receives a signal indicating that the heat source unit 40 that has been stopped has been started from any of the air conditioning controllers 49, the controller 70 instructs the pump 20 to increase the capacity of the pump 20 by a predetermined amount (step S21). . Specifically, the controller 70 instructs the pump 20 to increase the rotational speed of a motor (not shown) of the pump 20 by a predetermined rotational speed. The predetermined number of rotations is a value determined based on the number of heat source units 40 included in the air conditioning system 100, for example.

  Next, in step S22, the controller 70 determines whether or not a predetermined time has elapsed since the pump 20 was instructed to increase the capacity. Step S22 is repeated until it is determined that a predetermined time has elapsed. When it is determined that the predetermined time has elapsed, the controller 70 starts control during normal operation (control (c) described later).

  Here, since the rotation speed of the pump 20 is maintained without being changed for a certain period from the start of the heat source device 40 by the control in step S22, the operation of the air conditioning system 100 can be stabilized when the heat source device 40 is started. Easy.

(B) When one of the heat source devices 40 is started up The controller 70 sends a signal from one of the air conditioning controllers 49 to the effect that the heat source device 40 that has been operating has stopped (more specifically, the heat source device that has been operating. 40), the pump 20 is instructed to decrease the capacity of the pump 20 by a predetermined amount. Specifically, the controller 70 instructs the pump 20 to increase the rotational speed of a motor (not shown) of the pump 20 by a predetermined rotational speed. The predetermined number of rotations is a value determined based on the number of heat source units 40 included in the air conditioning system 100, for example.

(C) During normal operation Pump during normal operation of the controller 70 (when the signal indicating that the heat source unit 40 has been started / stopped has not been received and the process of step S22 of (a) above has not been performed) The capacity adjustment control 20 will be described with reference to FIG. 4B.

  The controller 70 performs capacity adjustment control of the pump 20 based on the opening degree Op of the valve body 35a of the flow rate adjustment valve 35 transmitted from the air conditioning controller 49 of the air conditioner 30 that is operating the heat source device 40.

  First, the controller 70 grasps the maximum opening degree (maximum opening degree Opmax) based on the received opening degree Op of the valve body 35a of the flow rate adjustment valve 35 corresponding to the operating heat source device 40 (step S31). ). There may be a plurality of valve bodies 35a of the flow rate adjustment valve 35 having the maximum opening Opmax.

  Next, in step S32, the controller 70 determines whether or not the maximum opening Opmax is smaller than a predetermined value, here 80%. If it is determined that the maximum opening Opmax <80%, the process proceeds to step S33. On the other hand, if it is determined that the maximum opening Opmax ≧ 80% or more, the process proceeds to step S34.

  When the maximum opening Opmax is smaller than 80% (when the maximum opening Opmax <80%), the opening Op of the valve body 35a of the flow rate adjustment valve 35 corresponding to the heat source device 40 in operation is all from 80%. It means that it is adjusted small. That is, when the maximum opening Opmax <80%, the capacity of the pump 20 is excessive. Therefore, the controller 70 performs control to reduce the capacity of the pump 20 in step S33. Specifically, the controller 70 instructs the pump 20 to reduce the rotational speed of the motor. More specifically, the controller 70 instructs the pump 20 to reduce the rotational speed of the motor by a predetermined rotational speed (a constant value). However, the instruction | indication with respect to the pump 20 of the controller 70 is not limited to this. For example, the controller 70 may grasp the degree of divergence between the maximum opening Opmax and a predetermined value (80%) to be compared, and may instruct to increase the degree of decrease in the motor rotation speed as the degree of divergence increases. .

  Note that the capacity of the pump 20 is reduced by reducing the capacity of the pump 20 so that the amount of circulating fluid flowing to the heat source device 40 is appropriate even if the opening Op of the valve body 35a of the flow rate adjusting valve 35 is increased. This is performed in order to prevent the waste of energy due to pressure loss in the valve body 35a. From such a viewpoint, the predetermined value with which the maximum opening Opmax is compared may be 100%. However, if the predetermined value to be compared of the maximum opening Opmax is 100%, the amount of circulating fluid flowing through the heat source device 40 cannot be increased even if the opening Op of the valve body 35a of the flow rate adjustment valve 35 is changed. A state may arise, and the responsiveness of the flow control of the circulating fluid flowing through the heat source unit 40 may be deteriorated. Therefore, the predetermined value to be compared with the maximum opening Opmax is preferably a number smaller than 100% (here, 80%).

  After step S33 ends, the process returns to step S31.

  In step S34, the controller 70 determines whether or not the maximum opening Opmax is greater than a predetermined value (80%). If it is determined that the maximum opening Opmax> 80%, the process proceeds to step S35. On the other hand, if it is determined that the maximum opening Opmax = 80%, the process returns to step S31.

  If the maximum opening Opmax> 80%, it means that there is a flow rate adjustment valve 35 in which the opening Op of the valve body 35a is too large. Therefore, the controller 70 increases the capacity of the pump 20 in step S35. To control. Specifically, the controller 70 instructs the pump 20 to increase the rotational speed of the motor. Similarly to step S33, the controller 70 may instruct the pump 20 to increase the number of rotations of the motor by a predetermined number of rotations (a constant value), or the maximum opening Opmax and a predetermined value (80 to be compared). %)), And the degree of increase in the number of rotations of the motor may be instructed to increase as the degree of deviation increases.

  After step S35 ends, the process returns to step S31.

(4) Features The air conditioning system 100 of the present embodiment has the following features.

(4-1)
The air conditioning system 100 according to the present embodiment includes a variable capacity pump 20, a cooling tower 80 and a boiler 90, a plurality of air conditioners 30, a plurality of flow rate adjustment valves 35, and a controller 70. The flow rate adjustment valve 35 is an example of a flow rate variable mechanism. The controller 70 is an example of a pump adjustment unit. The pump 20 circulates a circulating fluid (water in this embodiment). The cooling tower 80 cools the circulating fluid. The boiler 90 heats the circulating fluid. Each of the plurality of air conditioners 30 includes a refrigerant circuit 31 including a heat source device 40 that receives supply of cold and hot heat from the circulating fluid. The flow rate adjustment valve 35 is provided corresponding to each heat source device 40 and makes the amount of circulating fluid flowing through the corresponding heat source device 40 variable. The controller 70 adjusts the capacity of the pump 20 based on the state of the flow rate adjustment valve 35.

  Here, since the flow rate adjustment valve 35 which makes variable the quantity of the circulating fluid which flows into the heat source machine 40 is provided, the quantity of the circulating fluid which flows into the heat source machine 40 can be controlled according to the air conditioning load. Here, the capacity of the pump 20 that circulates the circulating fluid is adjusted according to the state of the flow rate adjustment valve 35. That is, here, according to the air conditioning load, the capacity of the pump 20, that is, the power of the pump 20 can be appropriately controlled. Therefore, compared with the conventional air conditioning system in which the amount of circulating fluid is not adjusted according to the air conditioning load, it is possible to realize the air conditioning system 100 excellent in energy saving performance.

(4-2)
In the air conditioning system 100 of the present embodiment, each air conditioner 30 instructs the flow rate adjustment valve 35 corresponding to the heat source unit 40 included in the air conditioner 30 to change the amount of circulating fluid flowing in the heat source unit 40. 49. The air conditioning controller 49 is an example of a flow rate variable mechanism adjustment unit.

  Here, each air conditioner 30 flows to the heat source unit 40 in order to directly instruct the flow rate adjustment valve 35 corresponding to the heat source unit 40 included in the air conditioner 30 to change the amount of the circulating fluid flowing to the heat source unit 40. The amount of circulating fluid can be adjusted with good responsiveness.

(4-3)
In the air conditioning system 100 according to the present embodiment, the air conditioning controller 49 supplies the heat source device to the flow rate adjustment valve 35 based on the high pressure value in the refrigerant circuit 31 of the air conditioning device 30 during the cooling operation of the air conditioning device 30 having the air conditioning controller 49. Instruct to change the amount of circulating fluid flowing to 40. The air conditioning controller 49 also determines the amount of circulating fluid that flows to the heat source device 40 through the flow rate adjustment valve 35 based on the low pressure value in the refrigerant circuit 31 of the air conditioning device 30 during the heating operation of the air conditioning device 30 having the air conditioning controller 49. Instruct to change.

  Here, since the instruction | indication with respect to the flow regulating valve 35 is performed based on the value of the high voltage | pressure in the refrigerant circuit 31 of the air conditioner 30, and the quantity of the circulating fluid which flows through the heat-source equipment 40 is changed appropriately according to an air-conditioning load. Is easy.

(4-4)
In the air conditioning system 100 of the present embodiment, the flow rate adjustment valve 35 includes a valve body 35a, and changes the amount of circulating fluid flowing through the heat source device 40 by changing the opening Op of the valve body 35a. The controller 70 is a flow rate adjustment valve 35 corresponding to the heat source device 40 in operation, and there is a flow rate adjustment valve 35 in which the opening Op of the valve body 35a is smaller than a predetermined value (80% in the present embodiment). The pump 20 is adjusted so as to reduce the capacity.

  More specifically, in the controller 70, the maximum value (maximum opening Opmax) of the valve body 35a of the flow rate adjustment valve 35 corresponding to the operating heat source device 40 is a predetermined value (80% in this embodiment). If it is smaller, adjust the capacity of the pump 20 to be reduced. In other words, the controller 70 increases the capacity of the pump 20 when the opening Op of the valve body 35a of the flow rate adjustment valve 35 corresponding to the operating heat source device 40 is less than a predetermined value (80% in the present embodiment). Adjust to lower.

  Here, since the capacity of the pump 20 is reduced when the opening Op of the valve body 35a of the flow rate adjustment valve 35 corresponding to the heat source device 40 in operation is below a predetermined value, the power of the pump 20 is unnecessarily large. Therefore, the air conditioning system 100 excellent in energy saving can be realized.

(4-5)
In the air conditioning system 100 of the present embodiment, when each heat source device 40 that has been stopped is started, the opening Op of the valve body 35a of the flow rate adjustment valve 35 corresponding to the heat source device 40 is set to 100%. Moreover, at the time of starting each heat source apparatus 40 that has been stopped, the controller 70 increases the capacity of the pump 20 (the number of rotations of the motor) by a predetermined amount, and maintains the increased capacity of the pump 20 for a predetermined period.

  Here, when the heat source device 40 is started, the opening Op of the valve body 35a of the flow rate adjustment valve 35 corresponding to the heat source device 40 is set to 100%, and the capacity of the pump 20 increases corresponding to the start of the heat source device 40. Since it is maintained for a predetermined period after being made, it is easy to stabilize the operation of the air conditioning system 100 when the heat source device 40 is activated.

(4-6)
In the air conditioning system 100 of the present embodiment, when each heat source device 40 that has been operating is stopped, the opening Op of the valve body 35a of the flow rate adjustment valve 35 corresponding to the heat source device 40 is set to 0%. In addition, when each heat source device 40 that has been operating is stopped, the controller 70 reduces the capacity of the pump 20 by a predetermined amount.

  Here, when the heat source device 40 is stopped, the opening Op of the valve body 35a of the flow rate adjustment valve 35 corresponding to the heat source device 40 is set to 0%, and the capacity of the pump 20 is reduced corresponding to the stop of the heat source device 40. Therefore, the energy saving performance of the air conditioning system 100 can be improved.

(4-7)
In the air conditioning system 100 of the present embodiment, the refrigerant circuit 31 of the air conditioner 30 further includes a use-side heat exchanger 51 that exchanges heat between the refrigerant cooled or heated by the heat source device 40 and the air.

  In this air conditioning system 100, even if the type of air conditioner 30 that directly exchanges heat between the refrigerant and the air in the air-conditioning target space where stability of the air conditioning system 100 is particularly required is used. The air conditioning system 100 excellent in energy saving performance can be realized while appropriately adjusting the amount of the circulating fluid flowing through 40.

(5) Modifications Modifications of the above embodiment are shown below. Note that the modified examples may be combined as appropriate within a range that does not contradict each other.

(5-1) Modification A
Although the air conditioning system 100 of the said embodiment has the cooling tower 80 and the boiler 90, it is not limited to this, You may have only any one. For example, when the air conditioner 30 performs only the cooling operation, the air conditioning system 100 may include only the cooling tower 80.

(5-2) Modification B
In the air conditioning system 100 of the above-described embodiment, the use-side heat exchanger 51 directly exchanges heat between the refrigerant and the air in the air-conditioning target space, but is not limited thereto. For example, in the air conditioning system 100, heat is exchanged between the refrigerant and the second circulating fluid (for example, water) in the use-side heat exchanger 51, and the second circulating fluid is transferred to the air-conditioning target space. You may be comprised so that the air of space may be heat-exchanged.

(5-3) Modification C
In the air conditioning system 100 of the above-described embodiment, the air conditioner 30 has the flow rate adjustment valve 35, but is not limited thereto, and the pipe 21 may be configured to have the flow rate adjustment valve 35.

  Moreover, in the air conditioning system 100 of the said embodiment, although the instruction | indication with respect to the flow regulating valve 35 is performed by the air conditioning controller 49, it is not limited to this. For example, the controller 70 may be configured to adjust the opening degree Op of the valve body 35a of the flow rate adjustment valve 35 based on the information regarding the air conditioning load of the air conditioner 30 transmitted from the air conditioning controller 49. However, in order to adjust the opening degree Op of the valve body 35a of the flow rate adjustment valve 35 with high responsiveness, it is preferable that the air conditioning controller 49 adjusts the opening degree Op of the valve body 35a of the flow rate adjustment valve 35.

  Moreover, in the air conditioning system 100 of the said embodiment, although the opening degree Op of the valve body 35a of the flow regulating valve 35 is transmitted to the controller 70 from the air conditioning controller 49, it is not limited to this. For example, the flow rate adjustment valve 35 and the controller 70 may be configured to communicate with each other, and the opening degree Op of the valve body 35 a may be transmitted from the flow rate adjustment valve 35 to the controller 70.

(5-4) Modification D
In the air conditioning system 100 of the above embodiment, the capacity adjustment control of the pump 20 is performed so that the maximum opening Opmax becomes a predetermined value, but the present invention is not limited to this. For example, in the air conditioning system 100, the capacity adjustment control of the pump 20 may be performed so that the maximum opening Opmax is within a predetermined range (for example, from 80% to 90%).

(5-5) Modification E
In the above embodiment, the opening degree Op of the valve body 35a of the flow rate adjustment valve 35 is controlled based on the comparison result between the actual condensation temperature and the optimum condensation temperature, or the actual evaporation temperature and the optimum evaporation temperature. However, the present invention is not limited to this. For example, when the refrigerant circuit 31 is provided with a pressure sensor that measures high pressure and low pressure, the valve body of the flow rate adjustment valve 35 based on the comparison result between the actual high pressure and the optimum high pressure, or the actual low pressure and the optimum low pressure. Control of the opening Op of 35a may be performed.

  INDUSTRIAL APPLICABILITY By using the present invention, an air conditioning system in which cold heat and / or heat is supplied from a circulating fluid circulated by a pump to a heat source device of an air conditioner, and it is possible to provide an air conditioning system that is excellent in energy saving and useful. It is.

20 Pump 30 Air conditioner 31 Refrigerant circuit 35 Flow rate adjusting valve (flow rate variable mechanism)
35a Valve body 40 Heat source unit 49 Air conditioning controller (flow rate variable mechanism adjustment unit)
51 User-side heat exchanger 70 Controller (pump adjustment part)
80 Cooling tower 90 Boiler 100 Air conditioning system Op Opening

JP-A-8-210667

Claims (7)

A variable capacity pump (20) for circulating the circulating fluid;
At least one of a cooling tower (80) for cooling the circulating fluid and a boiler (90) for heating the circulating fluid;
A plurality of air conditioners (30) each having a refrigerant circuit (31) including a heat source unit (40) that receives supply of cold and / or heat from the circulating fluid;
A plurality of flow rate variable mechanisms (35) provided corresponding to each of the heat source units, wherein the amount of the circulating fluid flowing through the corresponding heat source unit is variable;
A pump adjustment unit (70) for adjusting the capacity of the pump based on the state of the flow rate variable mechanism;
An air conditioning system (100) comprising: Each of the air conditioners further includes a flow rate variable mechanism adjustment unit (49) that instructs the flow rate variable mechanism corresponding to the heat source unit included in the air conditioner to change the amount of the circulating fluid flowing to the heat source unit. ,
The air conditioning system according to claim 1. The flow rate variable mechanism adjustment unit is configured to control the circulation fluid flowing through the heat source unit to the flow rate variable mechanism based on the high pressure and / or low pressure values in the refrigerant circuit of the air conditioner having the flow rate variable mechanism adjustment unit. Instruct to change the quantity,
The air conditioning system according to claim 2. The flow rate variable mechanism has a valve body (35a), and changes the amount of the circulating fluid flowing to the heat source machine by changing the opening (Op) of the valve body,
The pump adjustment unit is the flow rate variable mechanism corresponding to the heat source device in operation, and the pump capacity is reduced when the flow rate variable mechanism has an opening degree of the valve body smaller than a first predetermined value. Adjust to lower,
The air conditioning system according to any one of claims 1 to 3. At the start of each heat source machine that was stopped,
The opening degree of the valve body of the flow rate variable mechanism corresponding to the heat source machine is 100%,
And,
The pump adjustment unit increases the capacity of the pump by a predetermined amount, and maintains the capacity of the pump after the increase for a predetermined period.
The air conditioning system according to claim 4. At the time of stopping each heat source machine that was operating,
The opening of the valve body of the flow rate variable mechanism corresponding to the heat source machine is 0%,
And,
The pump adjusting unit reduces the capacity of the pump by a predetermined amount;
The air conditioning system according to claim 4. The refrigerant circuit further includes a use side heat exchanger (51) for exchanging heat between the refrigerant cooled or heated by the heat source unit and air.
The air conditioning system according to any one of claims 1 to 6.

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