JPWO2019012582A1 - Refrigeration and air conditioning system - Google Patents

Abstract

The refrigeration / air-conditioning system includes a compressor, a condenser, an expansion mechanism, and an evaporator, and includes three refrigerant circuits configured to circulate refrigerant, a heating-side load circuit, and a cooling-side load circuit. The three refrigerant circuits are a heating-side refrigerant circuit, a cooling-side refrigerant circuit, and a waste heat reduction circuit. The cooling side load circuit circulates the evaporator of the cooling side refrigerant circuit, the cooling load, and the evaporator of the exhaust heat reduction circuit. Circuit.

Description

  The present invention relates to a refrigeration and air conditioning system, and more particularly, to a refrigeration and air conditioning system that can perform both heating and cooling simultaneously.

  BACKGROUND ART Conventionally, there is a system that enables both cooling and heating at the same time in one facility (for example, see Patent Document 1). In Patent Literature 1, a compressor, a condenser, an expansion mechanism, and an evaporator are connected in a ring shape, and a refrigerant circuit for circulating a refrigerant therein is provided. Further, in this system, the condenser further heats the water to generate hot water and supplies the hot water to a heating load, and a heating-side load circuit, and cools the water with an evaporator to generate cold water. And a cooling-side load circuit that supplies the cooling load to the cooling load. With such a configuration, both heating and cooling can be simultaneously performed.

  In this type of system that can perform both heating and cooling at the same time, if the balance between the heating load and the cooling load is lost, the amount of heat will be surplus on the other hand, and the surplus heat will be discarded without being used, resulting in lower efficiency. Invite. For this reason, in Patent Literature 1, the efficiency is improved by recovering and using the excess heat amount without discarding it using an absorption refrigerator.

  In Patent Document 1, there is one refrigerant circuit, but two refrigerant circuits are provided, and a heating-side refrigerant circuit dedicated to heating and a cooling-side refrigerant circuit dedicated to cooling are configured, and both heating and cooling can be performed simultaneously. Some systems use it. In this system, the heating-side refrigerant circuit and the cooling-side refrigerant circuit are installed independently of each other, so that the amounts of heat required for heating and cooling can be independently secured.

JP 2012-141097 A

  Patent Literature 1 discloses a technique for improving efficiency by recovering an excess amount of heat based on a difference between a heating load and a cooling load in a configuration having one refrigerant circuit. The refrigerant circuit is applied to two configurations. Has not been considered. Further, in the configuration having two refrigerant circuits, the cooling load and the heating load are each processed by the dedicated refrigerant circuit, so that no surplus heat amount based on the difference between the heating load and the cooling load is generated. For this reason, it is considered effective to reduce the exhaust heat itself, but Patent Document 1 does not mention this point at all.

  The present invention has been made to solve such a problem, and to provide a refrigeration / air-conditioning system capable of reducing exhaust heat in a configuration in which respective refrigerant circuits dedicated to heating and cooling are independently provided. With the goal.

  The refrigeration / air-conditioning system according to the present invention includes a compressor, a condenser, an expansion mechanism, and an evaporator, and includes three refrigerant circuits configured to circulate refrigerant, a heating-side load circuit, and a cooling-side load circuit. The three refrigerant circuits include a heating-side refrigerant circuit, a cooling-side refrigerant circuit, and an exhaust heat reduction circuit. The heating-side load circuit includes a condenser of the heating-side refrigerant circuit, a heating load, and a condensation of the exhaust heat reduction circuit. The cooling-side load circuit circulates the cooling-side heat medium through the evaporator of the cooling-side refrigerant circuit, the cooling load, and the evaporator of the exhaust-heat reduction circuit. Circuit.

  ADVANTAGE OF THE INVENTION According to this invention, in the structure provided with each refrigerant circuit only for heating and only for cooling independently, reduction of exhaust heat is possible.

FIG. 2 is a refrigerant circuit diagram of the refrigeration and air conditioning system according to Embodiment 1 of the present invention. It is a control flowchart in the refrigerating air conditioning system according to Embodiment 1 of the present invention. FIG. 4 is an explanatory diagram of a reduction in exhaust heat of Operation Example 1 in the refrigeration / air-conditioning system according to Embodiment 1 of the present invention. FIG. 4 is an explanatory diagram of reduction of exhaust heat in Operation Example 2 in the refrigeration / air-conditioning system according to Embodiment 1 of the present invention. FIG. 6 is an explanatory diagram of a reduction in exhaust heat of Operation Example 3 in the refrigeration / air-conditioning system according to Embodiment 1 of the present invention.

Embodiment 1 FIG.
FIG. 1 is a refrigerant circuit diagram of a refrigeration / air-conditioning system according to Embodiment 1 of the present invention.
The refrigeration / air-conditioning system is a system that independently includes the heating-side refrigerant circuit 10 and the cooling-side refrigerant circuit 20, and can simultaneously perform heating and cooling. The refrigeration / air-conditioning system further includes a heating-side load circuit 15, a cooling-side load circuit 25, and an exhaust heat reduction circuit 30.

  The heating-side refrigerant circuit 10 includes a compressor 11, a condenser 12, an expansion mechanism 13, and an evaporator 14, and is a circuit in which the refrigerant circulates. The air from the fan 14a is sent to the evaporator 14.

  The heating-side load circuit 15 is a circuit in which a heating-side heat medium circulates through the condenser 12 of the heating-side refrigerant circuit 10, the heating load 100, and a condenser 32 of the exhaust heat reduction circuit 30, which will be described later. The heating load 100 corresponds to, for example, an indoor unit that performs heating, a floor heating panel, a bathroom heating device, or the like. In addition, the heating side heat medium corresponds to water, brine, or the like. Hereinafter, the description will be made on the assumption that the heating-side heat medium is water. In the heating-side load circuit 15, the hot water heated by the condenser 12 of the heating-side refrigerant circuit 10 is supplied to the heating load 100, and then passes through the condenser 32 of the exhaust heat reduction circuit 30. It returns to the condenser 12 of 10.

  The cooling-side refrigerant circuit 20 includes a compressor 21, a condenser 22, an expansion mechanism 23, and an evaporator 24, and is a circuit in which the refrigerant circulates. The air from the fan 24a is sent to the evaporator 24.

  The cooling-side load circuit 25 is a circuit in which a cooling-side heat medium circulates through the evaporator 24 of the cooling-side refrigerant circuit 20, the cooling load 200, and an evaporator 34 described later of the exhaust heat reduction circuit 30. The cooling load 200 corresponds to, for example, an indoor unit that performs cooling. In addition, the cooling-side heat medium corresponds to water, brine, or the like. Hereinafter, description will be made on the assumption that the cooling-side heat medium is water. In the cooling side load circuit 25, the chilled water cooled by the evaporator 24 of the cooling side refrigerant circuit 20 is supplied to the cooling load 200 side, and then passes through the evaporator 34 of the exhaust heat reduction circuit 30. It returns to the evaporator 24 of the refrigerant circuit 20.

  The exhaust heat reduction circuit 30 includes a compressor 31, a condenser 32, an expansion mechanism 33, and an evaporator 34, and is a circuit in which the refrigerant circulates. The exhaust heat reduction circuit 30 processes part or all of the heating-side or cooling-side load in place of the heating-side refrigerant circuit 10 or the cooling-side refrigerant circuit 20. Then, the exhaust heat reduction circuit 30 provides the cooling side or the heating side with an amount of heat balanced with the amount of heat necessary for processing the burdened load. In this way, the exhaust heat from the heating side load circuit 15 and the cooling side load circuit 25 is reduced. In addition, the exhaust heat reduction circuit 30 may be a refrigeration cycle including components provided for adjusting the state of the refrigeration cycle. For example, a refrigeration cycle including components such as an oil separator, a liquid receiver, and an accumulator may be used.

  2. Description of the Related Art Conventionally, there is a system that includes a heating-side refrigerant circuit 10 and a cooling-side refrigerant circuit 20 independently and includes a heating-side load circuit 15 and a cooling-side load circuit 25, and can simultaneously perform heating and cooling. The refrigeration / air-conditioning system according to the first embodiment further includes an exhaust heat reduction circuit 30 in the existing system, and connects a condenser 32 of the exhaust heat reduction circuit 30 to the heating side load circuit 15 by piping. It can be said that the evaporator 34 is connected to the cooling-side load circuit 25 by piping.

  Here, the compressor, the condenser, the expansion mechanism, and the evaporator that constitute each of the heating-side refrigerant circuit 10, the cooling-side refrigerant circuit 20, and the exhaust heat reduction circuit 30 will be briefly described.

  The compressor draws refrigerant and compresses the refrigerant to a high temperature and high pressure state. The compressor is constituted by a positive displacement compressor whose operating capacity can be varied. As a control method for varying the operation capacity, for example, there is a method by driving a motor controlled by an inverter.

  The condenser exchanges heat between the high-temperature and high-pressure refrigerant discharged from the compressor and air supplied from a fan as a heat source from the surroundings, and radiates heat of the refrigerant. The condenser 12 of the heating-side refrigerant circuit 10 and the condenser 32 of the exhaust heat reduction circuit 30 are configured by, for example, a plate heat exchanger. The condenser 22 of the cooling-side refrigerant circuit 20 is constituted by, for example, a fin tube type heat exchanger.

  The expansion mechanism decompresses and expands the refrigerant. The expansion mechanism may be constituted by an electronic expansion valve capable of variably adjusting the opening of the throttle by a stepping motor (not shown). In addition, besides the electronic expansion valve, any other type of mechanical expansion valve employing a diaphragm in the pressure receiving portion, or a temperature expansion valve, a capillary tube, or the like may be used as long as it plays a similar role. Good.

  The evaporator exchanges heat between the low-temperature and low-pressure refrigerant depressurized by the expansion mechanism and the heat medium of the heating-side load circuit 15. The evaporator 14 of the heating-side refrigerant circuit 10 is configured by, for example, a fin tube heat exchanger, and the evaporator 24 of the cooling-side refrigerant circuit 20 and the evaporator 34 of the exhaust heat reduction unit are configured by, for example, a plate-type heat exchanger. .

  As the refrigerant, for example, an HFC refrigerant such as R410A, R407C or R404A, or an HCFC refrigerant such as R22 or R134a can be used. Note that the refrigerant is not limited to these, and any refrigerant other than the above may be used as long as it performs the same refrigerant operation.

  The refrigeration and air conditioning system further includes a temperature sensor t1 and a temperature sensor t2, and a control device 40 that controls the entire refrigeration and air conditioning system. The temperature sensor t1 measures the temperature of the hot water flowing into the heating load 100. The temperature sensor t2 measures the temperature of the cold water flowing into the cooling load 200.

  The control device 40 controls the heating-side refrigerant circuit 10, the cooling-side refrigerant circuit 20, and the exhaust heat reduction so that the temperatures measured by the temperature sensors t1 and t2 become the temperatures requested by the heating load 100 and the cooling load 200. The circuit 30 is controlled. The control device 40 is configured by, for example, a microcomputer or a DSP, and includes a CPU, a RAM, a ROM, and the like. The control device 40 controls only the heating operation, only the cooling operation, or the simultaneous operation of performing both the heating operation and the cooling operation. The simultaneous operation includes a cooling main operation in which the load on the cooling side is larger than the load on the heating side, and a heating main operation in which the load on the heating side is larger than the load on the cooling side.

  In the first embodiment, the exhaust heat reduction circuit 30 that processes the loads on the heating side and the cooling side is provided, so that the exhaust heat in each of the heating side refrigerant circuit 10 and the cooling side refrigerant circuit 20 is reduced. Is possible.

Here, the exhaust heat reduction using the exhaust heat reduction circuit 30 will be described.
In the refrigeration / air-conditioning system, the heating-side refrigerant circuit 10, the cooling-side refrigerant circuit 20, and the exhaust heat reduction circuit 30 are controlled so that the temperatures required by the heating load 100 and the cooling load 200 are attained. Here, the cooling and heating loads are described by the following expressions for convenience of explanation. The cooling / heating capacity obtained when the compressor 31 of the exhaust heat reduction circuit 3 is operated at 100% without operating the heating-side refrigerant circuit 10 and the cooling-side refrigerant circuit 20 is assumed to be 100%, and the heating load 100 at that time is required. The hot water temperature to be set is T1. On the other hand, when the temperature required by the heating load 100 is reduced from T1, the required capacity at the heating load 100 is reduced. Is referred to as “heating X% load”. The same applies to the cooling side and is referred to as “cooling Y% load”.

  In processing the heating X% load and the cooling Y% load, the amount of heat for each load may be obtained only by operating the heating-side refrigerant circuit 10 and the cooling-side refrigerant circuit 20 without using the exhaust heat reduction circuit 30. Exhausted heat in this case is as follows. First, in the heating-side refrigerant circuit 10, exhaust heat corresponding to heating X% is generated in the evaporator 14. Specifically, in the condenser 12 of the heating-side refrigerant circuit 10, the heat amount corresponding to the heating X% is given to the heating-side load circuit 15, whereas in the evaporator 14, the heat amount is given from the condenser 12 to the heating-side load circuit 15. An amount of heat equivalent to the amount of heat is absorbed from the air blown from the fan 14a. That is, the heat quantity of the heat absorption is exhausted to the air. Therefore, on the side of the evaporator 14 of the heating-side refrigerant circuit 10, exhaust heat corresponding to heating X% is generated. Further, the same applies to the cooling-side refrigerant circuit 20 side, and exhaust heat corresponding to the cooling X% is generated on the condenser 12 side of the cooling-side refrigerant circuit 20.

  As described above, when the respective loads of the heating and the cooling are to be processed only by the operation of the heating-side refrigerant circuit 10 and the operation of the cooling-side refrigerant circuit 20, the refrigeration and air conditioning is performed by the amount of the exhaust heat as described above. System efficiency is reduced.

On the other hand, by performing the following operation using the exhaust heat reduction circuit 30, the exhaust heat is reduced and the decrease in efficiency is suppressed.
When there is an operation request for the heating X% load and the cooling Y% load, first, the smaller one of X% and Y% is processed by the exhaust heat reduction circuit 30. That is, here, if X <Y, the compressor 31 of the exhaust heat reduction circuit 30 is operated with an operation capacity that can handle the heating X% load.

  By operating the compressor 31 of the exhaust heat reduction circuit 30 with this operating capacity, the exhaust heat reduction circuit 30 can process the heating X% load, and the capacity required on the heating load 100 side becomes the capacity of the exhaust heat reduction circuit 30. It can be obtained only by driving. Therefore, the heating-side refrigerant circuit 10 does not need to be operated, and the heating-side refrigerant circuit 10 is not operated. Thus, the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 becomes 0%.

  Here, in the exhaust heat reduction circuit 30, since the operation for processing the heating X% load is performed, the heat amount balanced with the heating X% operation can be provided from the evaporator 34 to the cooling-side refrigerant circuit 20. The amount of heat to be balanced varies depending on the capacity of the exhaust heat reduction circuit 30. Here, the balanced amount of heat will be described as the amount of cooling X% that is the same as the amount of heat X% that can be processed on the heating side. The same applies to the following description of the operation example.

  As described above, since the cooling-side refrigerant circuit 20 can obtain the heat amount corresponding to the cooling X% from the exhaust heat reduction circuit 30, the X% load of the cooling Y% load required by the cooling load 200 is It can be covered by the exhaust heat reduction circuit 30. Therefore, the cooling-side refrigerant circuit 20 only needs to compensate for the insufficient Y% -X% load by operation. That is, the cooling-side refrigerant circuit 20 may be operated so as to satisfy the Y% -X% load, and the exhaust heat on the cooling-side refrigerant circuit 20 side is Y% -X%.

  As described above, the exhaust heat of the entire refrigeration / air-conditioning system is 0% on the heating-side refrigerant circuit 10 side and Y% -X% on the cooling-side refrigerant circuit 20 side.

  Comparing before and after the installation of the exhaust heat reduction circuit 30, before installation of the exhaust heat reduction circuit 30, it is X% on the heating side refrigerant circuit 10 side and Y% on the cooling side refrigerant circuit 20 side. On the other hand, after installation, it becomes 0% on the heating-side refrigerant circuit 10 side and Y% -X% on the cooling-side refrigerant circuit 20 side, so that exhaust heat can be reduced before and after installation.

FIG. 2 is a control flowchart in the refrigeration / air-conditioning system according to Embodiment 1 of the present invention.
When there is an operation request for the heating load 100 and the cooling load 200 (step S1), the control device 40 compares the respective required loads. That is, here, the control device 40 compares the heating X% load with the cooling Y% load (step S2). If X% and Y% are not equal, control device 40 performs control for processing the smaller load by exhaust heat reduction circuit 30. Here, assuming that X <Y, the control device 40 operates the compressor 31 of the exhaust heat reduction circuit 30 with an operation capacity capable of processing the X% load (step S3). In the following, the one with a smaller load may be referred to as a “small required load” and the one with a larger load may be referred to as a “large required load”.

  Then, the control device 40 determines whether or not the processing of the required small load X% load has been completed in the operation of the exhaust heat reduction circuit 30 (step S4). Specifically, the control device 40 may determine whether the required temperature has been achieved with the required small load. Therefore, control device 40 compares hot water temperature t_1 at the entrance of heating load 100 measured by temperature sensor t1 with hot water temperature t_0 required on the heating load 100 side. Then, when t_1 ≧ t_0, the control device 40 determines that the heating X% load has been processed by the operation of the exhaust heat reduction circuit 30. On the other hand, if t_1 <t_0, the control device 40 determines that the heating X% load has not been processed yet by the operation of the exhaust heat reduction circuit 30.

  Here, the case where the required small load is the heating load 100 has been described as an example. However, when the required small load is the cooling load 200, the control device 40 performs the operation of the exhaust heat reduction circuit 30 to reduce the required small load to Y. It is determined whether the processing of the% load has been completed. Specifically, control device 40 compares chilled water temperature t_2 at the inlet of cooling load 200 and chilled water temperature t_3 required on cooling load 200 side, measured by temperature sensor t2. If t_2 ≦ t_3, the control device 40 determines that the cooling X% load has been processed by the operation of the exhaust heat reduction circuit 30. On the other hand, when t_2> t_3, the control device 40 determines that the cooling X% load has not been processed by the operation of the exhaust heat reduction circuit 30 yet.

  Then, when the load processing of the required small load is completed, the control device 40 processes the refrigerant circuit connected to the required large load, here, the compressor 21 of the cooling-side refrigerant circuit 20, for the load of | X−Y |%. The operation is performed with a possible operation capacity (step S5).

  If X% and Y% are equal in the determination of step S2, control device 40 operates exhaust heat reduction circuit 30 with an operation capacity that can handle the X% load (step S6).

  The "operation capacity capable of processing the X% load" may be obtained in advance by determining the relationship between the load and the operation capacity, and when the load is determined, the operation capacity may be uniquely determined, or as follows. Good. That is, the operating capacity is increased by the set capacity, for example, at each set control interval, and when the requested temperature is achieved, the increase in the operating capacity is stopped, and the operation is continued at the operating capacity at the time of the stop. You may. In the case where X% and Y% are equal, when the operating capacity is increased by the set capacity at every set control interval, for example, the following control may be performed. That is, it is checked whether both t_1 ≧ t_0 and t_2 ≦ t_3 are satisfied so that the exhaust heat reduction circuit 30 can process both the heating X% load and the cooling Y% load. Operation may be continued at the operation capacity.

  Hereinafter, a specific operation example will be described.

<Operation example 1>
Next, the exhaust heat reduction operation in the cooling main operation will be described. Here, a case of a heating 20% load and a cooling 100% load will be described as an example.

FIG. 3 is an explanatory diagram of reduction of exhaust heat in Operation Example 1 in the refrigeration / air-conditioning system according to Embodiment 1 of the present invention.
In this case, the exhaust heat reduction circuit 30 is operated to process a heating 20% load with a small load among heating and cooling. That is, the exhaust heat reduction circuit 30 operates the compressor 31 with an operation capacity that can handle the heating 20% load.

  By operating the exhaust heat reduction circuit 30 to process the heating 20% load, the operation of the heating-side refrigerant circuit 10 is stopped, whereby the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is reduced to 0%. Become.

  Since the exhaust heat reduction circuit 30 performs an operation of processing a heating 20% load, a heat amount of 20% balanced with the heating 20% operation is provided from the exhaust heat reduction circuit 30 to the cooling-side load circuit 25. You. Thus, of the 100% load required by the cooling load 200, a 20% load can be covered by the operation of the exhaust heat reduction circuit 30. Therefore, the cooling-side refrigerant circuit 20 may be operated to process the shortage of the 80% load. That is, the cooling-side refrigerant circuit 20 only needs to operate the compressor 21 with an operation capacity that can handle the cooling 80% load. As a result, the heat exhausted from the condenser 22 of the cooling-side refrigerant circuit 20 is equivalent to 80%.

  Here, comparing the amount of exhaust heat between the case where the exhaust heat reduction circuit 30 is not installed and the case where the exhaust heat reduction circuit 30 is installed, the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is 20% and the cooling-side refrigerant circuit is not installed. The exhaust heat from the 20 condensers 22 is 100%. On the other hand, by installing the exhaust heat reduction circuit 30, as described above, the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is 0%, and the exhaust heat from the condenser 22 of the cooling-side refrigerant circuit 20. Is equivalent to 80%, and the amount of exhaust heat can be reduced as compared with the case where the exhaust heat reduction circuit 30 is not installed.

<Operation example 2>
Next, the exhaust heat reduction operation in the heating main operation will be described. Here, a case of a 100% load for heating and a 20% load for cooling will be described as an example.

FIG. 4 is an explanatory diagram of reduction of exhaust heat in Operation Example 2 in the refrigeration / air-conditioning system according to Embodiment 1 of the present invention.
First, the exhaust heat reduction circuit 30 is operated so as to process a cooling 20% load with a small load. That is, the exhaust heat reduction circuit 30 operates the compressor 31 with an operation capacity that can handle the cooling 20% load.

  By operating the exhaust heat reduction circuit 30 to process the cooling 20% load, the operation of the cooling refrigerant circuit 20 is stopped, whereby the exhaust heat from the condenser 12 of the cooling refrigerant circuit 20 is reduced to 0%. Become.

  In the exhaust heat reduction circuit 30, the operation for processing the cooling 20% load is performed. Therefore, a heat amount of 20% balanced with the cooling 20% operation is provided from the exhaust heat reduction circuit 30 to the heating side load circuit 15. You. Thus, of the 100% load required by the heating load 100, a 20% load can be covered by the operation of the exhaust heat reduction circuit 30. Therefore, the heating-side refrigerant circuit 10 may be operated to process the shortage of the 80% load. That is, the heating-side refrigerant circuit 10 only needs to operate the compressor 11 with an operation capacity that can handle a heating 80% load. As a result, the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is equivalent to 80%.

  Here, comparing the amount of exhaust heat between the case where the exhaust heat reduction circuit 30 is not installed and the case where the exhaust heat reduction circuit 30 is installed, the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is 100% and the cooling-side refrigerant circuit is not installed. The exhaust heat from the 20 condensers is equivalent to 20%. On the other hand, by installing the exhaust heat reduction circuit 30, as described above, the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is reduced by 80%, and the exhaust heat from the condenser of the cooling-side refrigerant circuit 20 is reduced. Is 0%, and the amount of exhaust heat can be reduced as compared with the case where the exhaust heat reduction circuit 30 is not installed.

<Operation example 3>
Next, an operation example 3 in which exhaust heat is set to 0% in the entire refrigeration / air-conditioning system will be described. Here, the case of a heating 100% load and a cooling 100% load will be described.

FIG. 5 is an explanatory diagram of reduction of exhaust heat in Operation Example 3 in the refrigeration / air-conditioning system according to Embodiment 1 of the present invention.
Here, since the required load on the heating load 100 side and the cooling load 200 side is the same 100%, the exhaust heat reduction circuit 30 operates the compressor 31 with an operation capacity that can handle the heating 100% load. .

  By operating the exhaust heat reduction circuit 30 so as to be able to process the heating 100% load, the operation of the heating-side refrigerant circuit 10 is stopped, whereby the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is reduced to 0%. Become.

  Since the exhaust heat reduction circuit 30 performs an operation for processing a 100% heating load, a heat amount of 100% balanced with the 100% heating operation is provided from the exhaust heat reduction circuit 30 to the cooling-side load circuit 25. You. Accordingly, all of the 100% cooling load required by the cooling load 200 can be covered by the operation of the exhaust heat reduction circuit 30. Therefore, the operation of the cooling-side refrigerant circuit 20 can also be stopped. As a result, the heat exhausted from the condenser 22 of the cooling-side refrigerant circuit 20 also becomes 0%.

  Here, comparing the amount of exhaust heat between the case where the exhaust heat reduction circuit 30 is not installed and the case where the exhaust heat reduction circuit 30 is installed, the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is 100% and the cooling-side refrigerant circuit is not installed. The exhaust heat from the 20 condensers 22 is also 100%. On the other hand, by installing the exhaust heat reduction circuit 30, as described above, the exhaust heat from the evaporator 14 of the heating-side refrigerant circuit 10 is 0%, and the exhaust heat from the condenser 22 of the cooling-side refrigerant circuit 20. Is also 0%, and the amount of heat exhausted can be reduced as compared with the case where the exhaust heat reduction circuit 30 is not installed.

  As described above, according to the first embodiment, the exhaust heat reduction circuit 30 is further provided in addition to the dedicated refrigerant circuits for heating and cooling, and the condenser 32 is connected to the heating-side load circuit 15. The evaporator 34 was connected to the cooling load circuit 25. Thus, while one of the two heat exchangers of the exhaust heat reduction circuit 30 processes one of the loads on the heating side and the cooling side, the other heat amount of the two heat exchangers of the exhaust heat reduction circuit 30 is exhausted. Instead, it can be used for the other processing of the loads on the heating side and the cooling side. As a result, exhaust heat in the heating-side refrigerant circuit 10 and the cooling-side refrigerant circuit 20 can be reduced.

  Further, when the load on one of the heating load 100 and the cooling load 200 is X% and the load on the other is Y%, which is larger than X%, the control device 40 reduces the exhaust heat with the operating capacity for processing the load of X%. The compressor 31 of the circuit 30 is operated. Thus, the operation of the load circuit having the load of X% is stopped. Then, the compressor of the load circuit having the load of Y% is operated with the operating capacity for processing the load of Y% -X%. Thus, the exhaust heat of the entire refrigeration / air-conditioning system can be reduced from X% + Y% to Y% -X% before and after the installation of the exhaust heat reduction circuit 30.

  When the loads for both the heating load 100 and the cooling load 200 are both X%, the control device 40 operates the compressor 31 of the exhaust heat reduction circuit 30 with the operation capacity for processing the X% load, and supplies the heating-side refrigerant. The operation of both the circuit 10 and the cooling-side refrigerant circuit 20 is stopped. Thus, the exhaust heat of the entire refrigeration / air-conditioning system can be reduced from X% + X% to 0%.

  In addition, the refrigeration / air-conditioning system according to the first embodiment can be easily constructed because the exhaust heat reduction circuit 30 is simply newly connected to an existing system that can simultaneously perform heating and cooling.

  It should be noted that the specific numerical values of the load in each operation example of the above embodiment are merely examples for ease of explanation, and do not limit the scope of the claims.

  Reference Signs List 10 heating side refrigerant circuit, 11 compressor, 12 condenser, 13 expansion mechanism, 14 evaporator, 14a fan, 15 heating side load circuit, 20 cooling side refrigerant circuit, 21 compressor, 22 condenser, 23 expansion mechanism, 24 Evaporator, 24a fan, 25 cooling side load circuit, 30 exhaust heat reduction circuit, 31 compressor, 32 condenser, 33 expansion mechanism, 34 evaporator, 40 control device, 100 heating load, 200 cooling load, t1 temperature sensor, t2 Temperature sensor.

Claims (3)

Three refrigerant circuits comprising a compressor, a condenser, an expansion mechanism and an evaporator, and configured to circulate the refrigerant,
Heating side load circuit,
A cooling-side load circuit,
The three refrigerant circuits are a heating-side refrigerant circuit, a cooling-side refrigerant circuit, and a waste heat reduction circuit,
The heating-side load circuit is a circuit in which a heating-side heat medium circulates through the condenser of the heating-side refrigerant circuit, a heating load, and the condenser of the exhaust heat reduction circuit.
The refrigeration / air-conditioning system, wherein the cooling-side load circuit is a circuit in which a cooling-side heat medium circulates through the evaporator of the cooling-side refrigerant circuit, the cooling load, and the evaporator of the exhaust heat reduction circuit. Equipped with a control device,
When the load on one of the heating load and the cooling load is X%, and the load on the other is Y%, which is larger than X%,
The control device operates the compressor of the exhaust heat reduction circuit with an operation capacity for processing the load of X%, while controlling the load of X% among the heating-side load circuit and the cooling-side load circuit. Stopping the operation of the load circuit having
2. The refrigeration system according to claim 1, wherein the compressor of the load circuit having the load of Y% of the heating-side load circuit and the cooling-side load circuit is operated at an operating capacity for processing a load of Y% −X%. 3. Air conditioning system. When the loads for both the heating load and the cooling load are both X%,
3. The control device according to claim 2, wherein the controller operates the compressor of the exhaust heat reduction circuit with an operation capacity for processing the X% load, and stops the operations of the heating-side load circuit and the cooling-side load circuit. 4. Refrigeration and air conditioning system.

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