JP2005282869A - Combined refrigeration cycle equipment and operation method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-efficiency combined refrigeration cycle facility in which the COP of the entire facility is improved.
In an air conditioner / refrigerator / refrigeration facility 1 (combined refrigeration cycle facility) including an air conditioner 2, a refrigerator 3 and a refrigerator 4, a refrigerant circuit 12 of the air conditioner 2 is replaced with an indoor heat exchanger 13. The compressor 14, the outdoor heat exchanger 15 for air conditioning (first outdoor heat exchanger), and the electronic expansion valve 16 are provided in this order. The refrigerant circuit 12 is provided with a bypass channel 51 that supplies a part of the refrigerant that has passed through the air conditioning outdoor heat exchanger 15 to the compressor 14 when the refrigeration cycle is formed. The bypass channel 51 is provided with the supercooling expansion valve 52 and the first heat exchange unit 53 in this order from the upstream side. Passes through the first heat exchange section 53 for refrigeration, refrigeration of the refrigerant circuits 22 and 32 (second refrigerant circuit) of the refrigeration apparatuses 3 and 4, and the refrigeration outdoor heat exchangers 25 and 35 (second outdoor heat exchanger). It is set as the structure which performs heat exchange between the made refrigerant | coolants.
[Selection] Figure 2

Description

  The present invention relates to a combined refrigeration cycle facility and an operation method thereof.

For example, in large stores and convenience stores, in addition to air conditioning devices that heat or cool the stores, refrigeration devices that store or display drinking water, food, etc. in a refrigerated state, ice, ice cream, frozen food And the like are stored or displayed in a frozen state.
As described above, for example, a store refrigeration air conditioner described in Patent Document 1 is used in a store including an air conditioner, a refrigerator, and a refrigeration apparatus.
This store refrigeration air conditioner has an air conditioning side refrigeration cycle and a refrigeration side refrigeration cycle.

Japanese Patent Laying-Open No. 2000-179961 (paragraph [0021] and FIG. 1)

However, since the temperature of the ambient atmosphere of the indoor heat exchanger (evaporator) is low, the refrigeration apparatus and the refrigeration apparatus have a low evaporation temperature, a low pressure, and a large pressure difference. Therefore, the efficiency is lower than that of the air conditioner. . For this reason, COP of the whole installation is influenced by the efficiency of a refrigeration apparatus and a freezing apparatus.
In addition, the air conditioning apparatus, the refrigeration apparatus, and the refrigeration apparatus have independent refrigerant circuits, and even when the load on one of the apparatuses is large, the load on the other apparatus may be low and the remaining power may be generated. . In this case, the capability of each device could not be fully utilized, and the COP as the entire facility was low.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the highly efficient composite type | mold refrigerating-cycle installation which improved COP of the whole installation.

In order to solve the above-described problems, the combined refrigeration cycle facility and the operation method thereof of the present invention employ the following means.
That is, the combined refrigeration cycle facility according to the present invention is a combined refrigeration cycle facility having a plurality of independent refrigerant circuits, and includes a compressor, a first outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. The first refrigerant circuit has at least one each of a first refrigerant circuit arranged in order and a second refrigerant circuit having a second outdoor heat exchanger that acts as a condenser when forming a refrigeration cycle. Is provided with a bypass flow path for supplying a part of the refrigerant that has passed through the first outdoor heat exchanger to the compressor when the refrigeration cycle is formed. A first heat exchanging unit that performs heat exchange between the refrigerant flowing through the bypass flow path and the refrigerant that has passed through the second outdoor heat exchanger of the second refrigerant circuit in this order from the upstream side. It is provided.

  In the combined refrigeration cycle equipment configured as described above, the refrigerant circulating in the first refrigerant circuit is condensed and liquefied by heat exchange with the outdoor atmosphere by the first outdoor heat exchanger when the refrigeration cycle is formed. Thereafter, most of the refrigerant is sent to the expansion valve and decompressed / expanded into a low-temperature / low-pressure refrigerant. This low-temperature and low-pressure refrigerant is sent to the indoor heat exchanger and exchanges heat with the indoor atmosphere and contributes to the cooling of the indoor atmosphere. Then, the refrigerant is pressurized by the compressor to become high-temperature and high-pressure, and is sent to the outdoor heat exchanger again. .

On the other hand, in the first refrigerant circuit, a part of the refrigerant heat-exchanged by the first outdoor heat exchanger when the refrigeration cycle is formed is supplied into the bypass flow path. The refrigerant supplied into the bypass flow path is sent to the supercooling expansion valve and decompressed / expanded to be a low temperature / low pressure refrigerant. The low-temperature and low-pressure refrigerant is heat-exchanged with the refrigerant that has passed through the second outdoor heat exchanger of the second refrigerant circuit by the first heat exchange unit, and contributes to further cooling of the refrigerant in the second refrigerant circuit. Thereafter, the refrigerant is sent to the compressor of the first refrigerant circuit, becomes high temperature and pressure by pressurization by the compressor, and is sent again to the outdoor heat exchanger of the first refrigerant circuit.
That is, in the combined refrigeration cycle equipment configured as described above, the refrigerant condensed and liquefied by the second outdoor heat exchanger in the second refrigerant circuit uses a part of the refrigerant circulating in the first refrigerant circuit. And since it cools further, COP at the time of refrigeration cycle formation of a 2nd refrigerant circuit improves.

For example, when the first refrigerant circuit is used as an air conditioner having a high COP and the second refrigerant circuit is used as a refrigeration apparatus or a refrigeration apparatus having a COP lower than that of the air conditioner, the entire combined refrigeration cycle facility COP is improved.
In addition, since this combined refrigeration cycle facility uses the excessive cold heat of the first refrigerant circuit for further cooling of the refrigerant of the second refrigerant circuit, a cold heat source is used for further cooling of the refrigerant of the second refrigerant circuit. The manufacturing cost and installation space can be reduced as compared with the case where these are provided separately.

In this combined refrigeration cycle facility, when the first and second refrigerant circuits each form a refrigeration cycle, the refrigerant flow to the bypass channel is controlled by operating the supercooling expansion valve. By doing so, an appropriate operation can be performed according to the respective loads of the first refrigerant circuit and the second refrigerant circuit.
For example, when the load on the first refrigerant circuit is large, the supercooling expansion valve is closed to stop the refrigerant flow to the bypass flow path. Thereby, all the refrigerant | coolants in a 1st refrigerant circuit will be used for the refrigerating cycle of a 1st refrigerant circuit, and the refrigerating capacity of a 1st refrigerant circuit can be exhibited to the maximum.
Further, when the load on the first refrigerant circuit is small and the load on the second refrigerant circuit is also small and further cooling of the refrigerant in the second refrigerant circuit is unnecessary, the subcooling expansion valve is closed and the first refrigerant circuit is closed. By using all the refrigerant in the refrigeration cycle, it is possible to reduce the amount of refrigerant circulating in the first refrigerant circuit and lighten the burden on the compressor, and to improve the efficiency of the first refrigerant circuit.

Further, not only simply opening and closing the supercooling expansion valve, but also controlling the opening degree of the supercooling expansion valve, it is possible to control the operation more finely.
For example, if the degree of opening of the supercooling expansion valve is increased to increase the amount of refrigerant flowing into the bypass flow path, the amount of heat exchange by the first heat exchanging unit increases, and the refrigerant in the second refrigerant circuit is cooled. Since it is promoted, the COP of the second refrigerant circuit can be improved.
Also, if the amount of refrigerant used in the refrigeration cycle is increased in the first refrigerant circuit by reducing the opening of the supercooling expansion valve to reduce the amount of refrigerant flowing to the bypass flow path, It is possible to improve the efficiency of the first refrigerant circuit and the cooling capacity of the indoor atmosphere.

  Further, in this combined refrigeration cycle facility, a pressure measuring device that measures the pressure of the refrigerant in at least one of the upstream side and the downstream side of the indoor heat exchanger of the first refrigerant circuit, and the pressure measurement A control device is provided for controlling the operation of the supercooling expansion valve based on the measured value of the device, and the control device has a refrigerant pressure on the upstream side of the indoor heat exchanger equal to or higher than a first reference value. If the refrigerant pressure on the downstream side of the indoor heat exchanger becomes equal to or lower than the second reference value, the supercooling expansion valve may be opened.

  Here, the indoor heat exchanger of the refrigerant circuit is incorporated in a device such as an indoor air conditioning unit (indoor unit) or a refrigerator, and used as a cold heat source for cooling the indoor atmosphere or the internal atmosphere. In general, for devices such as indoor air conditioning units and refrigerators, it is desirable to stop heat exchange by the indoor heat exchanger, such as when the indoor atmosphere or internal atmosphere reaches a target temperature, or when the indoor heat exchanger is defrosted. A mechanism is provided to stop or reduce the supply of the refrigerant to the indoor heat exchanger when the conditions are met.

On the other hand, in the refrigerant circuit, since the refrigerant is pumped by the compressor, when the supply of the refrigerant to the indoor heat exchanger is stopped or rapidly reduced, the refrigerant pressure on the upstream side of the indoor heat exchanger is reduced. The temperature rapidly rises and a load is applied to each member constituting the refrigerant circuit (at this time, the refrigerant pressure rapidly decreases on the downstream side of the indoor heat exchanger).
Since it is difficult to control the refrigerant delivery amount of the compressor by following such a rapid pressure fluctuation, conventionally, a sudden rise in the refrigerant pressure upstream of the indoor heat exchanger in the refrigerant circuit is prevented. It was difficult.

In contrast, in the combined refrigeration cycle facility according to the present invention, when the refrigerant pressure upstream of the indoor heat exchanger is equal to or higher than a predetermined first reference value, or downstream of the indoor heat exchanger When the refrigerant pressure becomes equal to or lower than a predetermined second reference value, the supercooling expansion valve is opened by the control device.
That is, when the supply of refrigerant to the indoor heat exchanger is stopped or rapidly reduced, the refrigerant on the upstream side of the indoor heat exchanger is released to the downstream side of the indoor heat exchanger through the bypass flow path. Even if the amount of refrigerant delivered by the compressor is not reduced, an abnormal increase in the refrigerant pressure in the refrigerant circuit is prevented, and each member constituting the refrigerant circuit is protected. Further, by allowing the refrigerant to flow into the bypass flow path as described above, heat exchange with the refrigerant in the second refrigerant circuit is performed as described above, and cold heat can be recovered.

  Further, in this combined refrigeration cycle facility, the second refrigerant circuit has a receiver that temporarily stores the refrigerant that has passed through the second outdoor heat exchanger, and the bypass flow path of the first refrigerant circuit is In addition, a part may be inserted into the refrigerant storage range in the receiver, and the insertion part may be the first heat exchange unit.

  In the combined refrigeration cycle equipment configured as described above, the insertion portion inserted into the receiver of the second refrigerant circuit in the bypass flow path of the first refrigerant circuit constitutes the first heat exchange portion. For this reason, in this combined refrigeration cycle facility, there is no need to newly provide a heat exchanger for cooling the refrigerant in the second refrigerant circuit, so that the manufacturing cost and installation space can be reduced.

  Moreover, this composite refrigeration cycle facility may include a heat storage body that performs heat exchange with the refrigerant supplied to the first heat exchange unit.

In the combined refrigeration cycle equipment configured as described above, among the refrigerant circulating in the first refrigerant circuit, the cold heat of the refrigerant supplied to the first heat exchange unit is temporarily stored in the heat storage body, Used to cool the refrigerant in the two refrigerant circuit.
For example, the load on the second refrigerant circuit temporarily increases to increase the refrigerant flow rate, or the load on the first refrigerant circuit temporarily increases to stop the supply of refrigerant to the bypass flow path or to reduce the supply amount In the case where the heat is stored, the cold stored in the heat storage body is used for cooling the refrigerant in the second refrigerant circuit in addition to the cold of the refrigerant supplied to the first heat exchange unit.
Thereby, even if the load of a 1st refrigerant circuit fluctuates, cooling of the refrigerant | coolant of a 2nd refrigerant circuit can be performed stably.

  Here, since this heat storage body should just be able to store only the cold heat necessary to make up for the cold heat temporarily insufficient due to the load fluctuation of the first and second refrigerant circuits, the heat storage body needs only a small amount, Further, since it is not necessary to provide a special heat retaining structure for keeping warm for a long time, even if this structure is adopted, it is not necessary to enlarge the combined refrigeration cycle equipment.

  Further, in this combined refrigeration cycle facility, the first refrigerant circuit is between a refrigerant supplied to the indoor heat exchanger when the refrigeration cycle is formed and a refrigerant flowing in the bypass flow path of the first refrigerant circuit. You may have the 2nd heat exchange part which performs heat exchange by.

In the combined refrigeration cycle equipment configured as described above, the refrigerant supplied to the indoor heat exchanger in the first refrigerant circuit by the second heat exchange unit is circulated in the bypass passage of the first refrigerant circuit. Heat exchange between. Thereby, the cold heat of the refrigerant | coolant which distribute | circulates the inside of a bypass flow path can be collect | recovered, and it can utilize as cold heat of a 1st refrigerant circuit, and the efficiency of a 1st refrigerant circuit improves.
In addition, when the combined refrigeration cycle facility has the heat storage body that performs heat exchange with the refrigerant supplied into the first heat exchange unit, the indoor heat exchanger is provided in the first refrigerant circuit. The supplied refrigerant is further cooled by the cold heat stored in the heat storage body.
In other words, the first refrigerant circuit stabilizes the cooling of the indoor atmosphere because even if the load of the refrigeration cycle suddenly increases and the necessary amount of cooling heat rapidly increases, the cold heat generated by itself compensates for the insufficient cooling heat. It can be carried out.

  In the combined refrigeration cycle facility, the first refrigerant circuit may change the flow direction of at least a part of the refrigerant that has passed through the indoor heat exchanger during the heating cycle from the first outdoor heat exchanger. You may have the switching apparatus switched to a bypass flow path.

  In the first refrigerant circuit, when the heating cycle is formed, the refrigerant circulating in the first refrigerant circuit is circulated in the direction opposite to that when the refrigeration cycle is formed. Specifically, at the time of forming a heating cycle, the refrigerant in the first refrigerant circuit is pressurized by a compressor to become high temperature and high pressure, and then heat exchanged with the indoor atmosphere by the indoor heat exchanger to heat the indoor atmosphere. Contribute to. Thereafter, the refrigerant is sent to an expansion valve and decompressed / expanded to be a low-temperature and low-pressure refrigerant. This low-temperature and low-pressure refrigerant is sent to the first outdoor heat exchanger, exchanges heat with the outdoor atmosphere, evaporates and vaporizes, and then is sent again to the compressor.

In the combined refrigeration cycle facility according to the present invention, by operating a switching device provided in the first refrigerant circuit, a part of the refrigerant heat-exchanged by the indoor heat exchanger is converted into the first outdoor heat exchanger. Instead, it is supplied into the bypass channel.
The refrigerant supplied into the bypass flow path is sent to the subcooling expansion valve and decompressed / expanded to be a low-temperature / low-pressure refrigerant, and the second heat exchanger is connected to the second outdoor heat exchanger of the second refrigerant circuit. Heat exchange with the passed refrigerant contributes to further cooling of the refrigerant in the second refrigerant circuit. At this time, the refrigerant flowing through the bypass flow path absorbs the heat of the refrigerant in the second refrigerant circuit and evaporates and vaporizes. That is, the first heat exchange unit acts as an evaporator of the first refrigerant circuit.
And the refrigerant | coolant which passed the 1st heat exchange part is sent to the compressor of a 1st refrigerant circuit, becomes high temperature high pressure by the pressurization by a compressor, and is again sent to the indoor heat exchanger of a 1st refrigerant circuit.

Thus, in this combined refrigeration cycle facility, it is possible to further cool the refrigerant in the second refrigerant circuit even when the first refrigerant circuit forms a heating cycle.
Moreover, since a 1st heat exchange part acts as an evaporator, the flow volume of the refrigerant | coolant supplied to a 1st outdoor heat exchanger can be reduced, or supply can be stopped. As a result, the temperature of the first outdoor heat exchanger is unlikely to decrease, and the temperature of the outdoor outdoor air exchanger becomes close to the outdoor ambient temperature, so that frosting of the first outdoor heat exchanger can be prevented, reducing maintenance work and the number of defrosts. can do.

A method for operating a combined refrigeration cycle facility according to the present invention includes a first refrigerant circuit in which a compressor, a first outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are arranged in this order, and condensation when a refrigeration cycle is formed. A second refrigerant circuit having a second outdoor heat exchanger acting as a storage unit, and a method for operating a combined refrigeration cycle facility having at least one each,
In a state where the first and second refrigerant circuits each form a refrigeration cycle, a part of the refrigerant that has passed through the first outdoor heat exchanger is decompressed and expanded to form a low-temperature and low-pressure refrigerant, Heat exchange is performed between the refrigerant and the refrigerant that has passed through the second outdoor heat exchanger of the second refrigerant circuit.

  In this combined refrigeration cycle facility operation method, the refrigerant circulating in the first refrigerant circuit is condensed and liquefied by heat exchange with the outdoor atmosphere by the first outdoor heat exchanger when the refrigeration cycle is formed. Thereafter, most of the refrigerant is sent to the expansion valve and decompressed / expanded into a low-temperature / low-pressure refrigerant. This low-temperature and low-pressure refrigerant is sent to the indoor heat exchanger and exchanges heat with the indoor atmosphere and contributes to the cooling of the indoor atmosphere. Then, the refrigerant is pressurized by the compressor to become high-temperature and high-pressure, and is sent to the outdoor heat exchanger again. .

In the operation method of the combined refrigeration cycle facility according to the present invention, a low-temperature and low-pressure refrigerant is obtained by decompressing and expanding a part of the refrigerant heat-exchanged by the first outdoor heat exchanger when the refrigeration cycle of the first refrigerant circuit is formed. And
Furthermore, the refrigerant of the second refrigerant circuit is further cooled by exchanging heat between the low-temperature and low-pressure refrigerant and the refrigerant that has passed through the second outdoor heat exchanger of the second refrigerant circuit.
That is, in the operation method of the combined refrigeration cycle facility, the refrigerant condensed and liquefied by the second outdoor heat exchanger in the second refrigerant circuit uses a part of the refrigerant circulating in the first refrigerant circuit. Furthermore, since it cools, COP at the time of refrigeration cycle formation of a 2nd refrigerant circuit improves.
This effect increases as the amount of refrigerant used for heat exchange with the refrigerant in the second refrigerant circuit increases in the refrigerant in the first refrigerant circuit.

For example, when the first refrigerant circuit is used as an air conditioner having a high COP and the second refrigerant circuit is used as a refrigeration apparatus or a refrigeration apparatus having a COP lower than that of the air conditioner, the entire combined refrigeration cycle facility COP is improved.
Further, in this method of operating the combined refrigeration cycle facility, the extra cooling heat of the first refrigerant circuit is used for further cooling of the refrigerant in the second refrigerant circuit, and further cooling of the refrigerant in the second refrigerant circuit is performed. Since it is not necessary to provide a separate cold heat source, the manufacturing cost and installation space of the combined refrigeration cycle facility can be reduced.

  In the operation method of the combined refrigeration cycle facility, when the load of the first refrigerant circuit is large, or the load of the first refrigerant circuit is small and the load of the second refrigerant circuit is small, When further cooling of the refrigerant is unnecessary, heat exchange between the refrigerant in the first refrigerant circuit and the refrigerant in the second refrigerant circuit may be stopped or reduced.

In this operation method, when the load of the first refrigerant circuit is large in a state where the first and second refrigerant circuits respectively form a refrigeration cycle, heat exchange between the refrigerants is stopped or reduced. The cold heat of the refrigerant in the refrigerant circuit is used more in the refrigeration cycle of the first refrigerant circuit, and the refrigeration capacity of the first refrigerant circuit can be further exhibited.
In addition, when the load of the first refrigerant circuit is small, the load of the second refrigerant circuit is also small and further cooling of the refrigerant of the second refrigerant circuit is unnecessary, the heat exchange between the refrigerants is stopped or reduced, Since the cold heat of the refrigerant in the first refrigerant circuit is used more in the refrigeration cycle of the first refrigerant circuit, the amount of refrigerant circulating in the first refrigerant circuit can be reduced and the burden on the compressor can be reduced. The efficiency of the circuit can be improved.

  In the operation method of the combined refrigeration cycle apparatus, when the refrigeration cycle of the first refrigerant circuit is formed, the refrigerant in at least one of the upstream side and the downstream side of the indoor heat exchanger of the first refrigerant circuit is When the pressure is measured and the refrigerant pressure upstream of the indoor heat exchanger is equal to or higher than the first reference value, or when the refrigerant pressure downstream of the indoor heat exchanger is equal to or lower than the second reference value. A part of the refrigerant that has passed through the first outdoor heat exchanger may be supplied to the compressor.

  That is, when the supply of the refrigerant to the indoor heat exchanger is stopped or rapidly reduced, the refrigerant on the upstream side of the indoor heat exchanger is released to the downstream side of the indoor heat exchanger through the bypass channel. Thereby, even if it does not reduce the amount of refrigerant delivered by the compressor, the abnormal increase in the refrigerant pressure in the refrigerant circuit is prevented, and each member constituting the refrigerant circuit is protected. Further, by allowing the refrigerant to flow into the bypass flow path as described above, heat exchange with the refrigerant in the second refrigerant circuit is performed as described above, and cold heat can be recovered.

  An operating method of a combined refrigeration cycle facility according to the present invention is the operating method of the combined refrigeration cycle facility according to claim 1, wherein the upstream side and the downstream side of the indoor heat exchanger of the first refrigerant circuit. Providing a pressure measuring device for measuring the pressure of the refrigerant in at least one of them and monitoring the measured value, and when the refrigerant pressure on the upstream side of the indoor heat exchanger is equal to or higher than a first reference value, or When the refrigerant pressure on the downstream side of the indoor heat exchanger becomes equal to or lower than the second reference value, the opening degree of the supercooling expansion valve is increased.

In the operation method of the combined refrigeration cycle facility according to the present invention, when the refrigerant pressure on the upstream side of the indoor heat exchanger is equal to or higher than a predetermined first reference value, or the refrigerant on the downstream side of the indoor heat exchanger When the pressure falls below a predetermined second reference value, the supercooling expansion valve is opened.
That is, when the supply of the refrigerant to the indoor heat exchanger is stopped or rapidly reduced, the supercooling expansion valve is opened, and the refrigerant on the upstream side of the indoor heat exchanger passes through the bypass flow path through the indoor heat exchanger. Escape to the downstream side of the exchanger. Thereby, even if it does not reduce the amount of refrigerant delivered by the compressor, the abnormal increase in the refrigerant pressure in the refrigerant circuit is prevented, and each member constituting the refrigerant circuit is protected. Further, by allowing the refrigerant to flow into the bypass flow path as described above, heat exchange with the refrigerant in the second refrigerant circuit is performed as described above, and cold heat can be recovered.

  According to the combined refrigeration cycle facility and the method of operating the same according to the present invention, the second refrigerant circuit can utilize the excessive cold heat of the first refrigerant circuit, so that the capabilities of the first and second refrigerant circuits are increased. It can be fully utilized and the COP of the entire equipment is high.

  According to the operation method of the combined refrigeration cycle facility according to the present invention, even when the supply of the refrigerant to the indoor heat exchanger is stopped or rapidly reduced, an abnormal increase in the refrigerant pressure in the refrigerant circuit is prevented. Thus, each member constituting the refrigerant circuit is protected.

Embodiments according to the present invention will be described below with reference to the drawings.
[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
In the present embodiment, an example in which the combined refrigeration cycle equipment is applied to the air conditioning / refrigeration / refrigeration equipment 1 shown in FIG. 1 will be described.
As shown in FIG. 1, the air conditioning / refrigeration / refrigeration facility 1 is applied to a store such as a large store or a convenience store, and is equipped with an air conditioner 2 for heating or cooling the store, drinking water, A refrigeration apparatus 3 for storing or displaying food or the like in a refrigerated state and a refrigeration apparatus 4 for storing or displaying ice, ice cream, frozen food or the like in a frozen state are provided.
The air conditioner 2, the refrigeration apparatus 3, and the refrigeration apparatus 4 have independent refrigerant circuits.

The air conditioner 2 has an indoor air conditioning unit 11 provided in the store. A refrigerant circuit 12 (first refrigerant circuit) shown in FIG. 2 is connected to the indoor air conditioning unit 11.
The refrigerant circuit 12 selectively forms one of a heating cycle and a cooling cycle.
The refrigerant circuit 12 includes an indoor heat exchanger 13 provided in the indoor air conditioning unit 11 on the refrigerant flow path through which the refrigerant is circulated to exchange heat between the refrigerant and the store atmosphere, and a compressor that pressurizes the refrigerant. 14, an air conditioning outdoor heat exchanger 15 (first outdoor heat exchanger) that performs heat exchange between the refrigerant and the outdoor atmosphere, and an electronic expansion valve (throttle resistor) 16 that expands the refrigerant to reduce the pressure. The configuration is provided in this order.

In the refrigerant circuit 12, the compressor 14 is connected to the indoor heat exchanger 13 and the air conditioning outdoor heat exchanger 15 via a four-way valve 17.
The four-way valve 17 controls the refrigerant discharge direction from the compressor 14 in the refrigerant flow path and the refrigerant supply direction to the compressor 14 in the refrigerant flow path, controls the flow of the refrigerant in the refrigerant flow path, and performs heating. One of the cycle and the cooling cycle is selectively formed.
In the refrigerant circuit 12, an accumulator 18 that removes the liquid refrigerant from the refrigerant flowing through the refrigerant circuit 12 and passes only the gaseous refrigerant is provided on the upstream side of the compressor 14.

Here, in the refrigerant circuit 12, as the electronic expansion valve 16, a cooling expansion valve 16a is provided on the indoor heat exchanger 13 side, and a heating expansion valve 16b is provided on the outdoor heat exchanger 15 side. The air conditioner 2 is configured to use these electronic expansion valves 16 in accordance with the operation mode.
Specifically, as shown in FIG. 2, the refrigerant circuit 12 is provided with a bypass circuit 19a that bypasses the heating expansion valve 16b, and this bypass circuit 19a has only a flow direction when a cooling cycle is formed. A check valve 19b that allows the refrigerant to flow is provided. Thus, when the cooling cycle is formed, the refrigerant bypasses the heating expansion valve 16b and is expanded and depressurized by the cooling expansion valve 16a.
The refrigerant circuit 12 is provided with a bypass circuit 19c that bypasses the cooling expansion valve 16a. The bypass circuit 19c includes a check valve that allows the refrigerant to flow only in the flow direction when the heating cycle is formed. 19d is provided. Thus, when the heating cycle is formed, the refrigerant bypasses the cooling expansion valve 16a and is expanded and depressurized by the heating expansion valve 16b.

As shown in FIG. 1, the refrigeration apparatus 3 includes a refrigerated showcase 21 that is provided in a store and stores and displays refrigerated objects. A refrigerant circuit 22 (second refrigerant circuit) shown in FIG. 2 is connected to the refrigerated showcase 21.
The refrigerant circuit 22 forms a refrigeration cycle for cooling the atmosphere in the refrigerated showcase 21.
The refrigerant circuit 22 includes an indoor heat exchanger 23 that is provided in the refrigerated showcase 21 and exchanges heat between the refrigerant and the atmosphere in the refrigerated showcase 21 on a refrigerant flow path through which the refrigerant is circulated, and a refrigerant A compressor 24 that pressurizes the refrigerant, an outdoor heat exchanger 25 (second outdoor heat exchanger) that condenses the refrigerant by exchanging heat between the refrigerant and the outdoor atmosphere, and an expansion that cools the refrigerant by expanding the refrigerant. The valve (throttle resistor) 26 is provided in this order.
Further, in the refrigerant circuit 22, an accumulator 28 that removes the liquid refrigerant from the refrigerant flowing through the refrigerant circuit 22 and passes only the gaseous refrigerant is provided on the upstream side of the compressor 24.

As shown in FIG. 1, the refrigeration apparatus 4 includes a refrigeration showcase 31 that is provided in a store and stores and displays objects to be frozen. A refrigerant circuit 32 (second refrigerant circuit) shown in FIG. 2 is connected to the refrigeration showcase 31.
The refrigerant circuit 32 forms a refrigeration cycle for cooling the atmosphere in the refrigeration showcase 31.
The refrigerant circuit 32 includes an indoor heat exchanger 33 that is provided in the refrigeration showcase 31 and exchanges heat between the refrigerant and the atmosphere in the refrigeration showcase 31 on the refrigerant flow path through which the refrigerant circulates, A compressor 34 that pressurizes the refrigerant, an outdoor heat exchanger 35 (second outdoor heat exchanger) that condenses the refrigerant by exchanging heat between the refrigerant and the outdoor atmosphere, and an expansion that cools the refrigerant by expanding the refrigerant. The valve (throttle resistor) 36 is provided in this order.
In the refrigerant circuit 32, an accumulator 38 that removes the liquid refrigerant from the refrigerant flowing through the refrigerant circuit 32 and passes only the gaseous refrigerant is provided on the upstream side of the compressor 34.

As shown in FIGS. 1 and 2, the air conditioning / refrigeration / refrigeration facility 1 includes an air conditioning outdoor heat exchanger 15, a refrigeration outdoor heat exchanger 25, and a refrigeration unit for the refrigerant circuits 12, 22, and 32. One outdoor unit 42 in which the outdoor heat exchanger 35 is accommodated is provided.
An air blower (not shown) that takes outside air into the outdoor unit 42 and makes it contact the outdoor heat exchanger 15 for air conditioning, the outdoor heat exchanger 25 for refrigeration, and the outdoor heat exchanger 35 for freezing. Thus, heat exchange is performed between these outdoor heat exchangers and the outside air.

Here, the refrigerant circuit 12 constituting the air conditioner 2 is provided with a bypass flow path 51 for supplying a part of the refrigerant that has passed through the air-conditioning outdoor heat exchanger 15 to the compressor 14 when the cooling cycle is formed. ing. In the present embodiment, the bypass flow path 51 connects a portion located between the heating expansion valve 16b and the cooling expansion valve 16a in the refrigerant circuit 12 to a portion located upstream of the accumulator 18. Has been.
The bypass channel 51 is provided with a supercooling expansion valve 52 and a first heat exchange unit 53 in this order from the upstream side.

On the bypass flow path 51, a heat storage container 56 in which a heat storage body is enclosed is provided, and a part of the bypass flow path 51 is inserted into the heat storage container 56.
The first heat exchanging portion 53 is configured by a portion inserted into the heat storage container 56 in the bypass flow path 51, and between the refrigerant circulating in the bypass flow path 51 and the heat storage body in the heat storage container 56. The heat exchange is done at.
In the present embodiment, the heat storage body is a spherical capsule filled with a heat storage material, and the heat storage container 56 is filled with a plurality of capsules without gaps.

In addition, a part of the refrigerant circuit 22 located between the refrigeration outdoor heat exchanger 25 and the expansion valve 26 is inserted into the heat storage container 56, and the refrigeration outdoor heat exchanger is inserted in the refrigerant circuit 32. A part of the portion located between 35 and the expansion valve 36 is also inserted. Thereby, heat exchange is performed between the heat storage body and the refrigerant circulating in the refrigerant circuits 22 and 32.
Here, in the bypass flow path 51 and the refrigerant circuits 22 and 32, the portion inserted into the heat storage container 56 stores the heat so that heat exchange between the refrigerant circulating in the interior and the heat storage body is efficiently performed. A sufficient contact area with the body is secured.

Hereinafter, the operation of the air conditioning / refrigeration / refrigeration equipment 1 configured as described above will be described.
First, each operation | movement of the air conditioning apparatus 2, the refrigeration apparatus 3, and the freezing apparatus 4 is demonstrated.
During the cooling operation, the air conditioner 2 has the refrigerant outlet of the compressor 14 connected to the air conditioning outdoor heat exchanger 15 side of the refrigerant flow path by the four-way valve 17 and the refrigerant inlet of the compressor 14 is connected to the room of the refrigerant flow path. It is connected to the heat exchanger 13 side.
As a result, the gaseous refrigerant that has been pressurized by the compressor 14 to a high temperature and high pressure is sent to the outdoor heat exchanger 15 for air conditioning. The refrigerant sent into the outdoor heat exchanger 15 for air conditioning is condensed and liquefied by being deprived of heat by the outside air taken into the outdoor unit 42. That is, the outdoor heat exchanger 15 for air conditioning functions as a condenser.

This liquid refrigerant is expanded and depressurized by a cooling expansion valve 16a provided on the downstream side of the air conditioning outdoor heat exchanger 15 to become a low-temperature and low-pressure two-phase refrigerant, and then sent to the indoor heat exchanger 13. Thus, heat is exchanged with the room atmosphere.
The refrigerant sent into the indoor heat exchanger 13 removes heat from the indoor atmosphere and evaporates, thereby cooling the indoor atmosphere. That is, the indoor heat exchanger 13 functions as an evaporator.
The gaseous refrigerant that has passed through the indoor heat exchanger 13 is sent to the refrigerant inlet of the compressor 14 through the four-way valve 17, is again pressurized by the compressor 14, and sent to the outdoor heat exchanger 15 for air conditioning, The above process is repeated.

On the other hand, in the air conditioning apparatus 2, during the heating operation, the refrigerant outlet of the compressor 14 is connected to the indoor heat exchanger 13 side of the refrigerant flow path by the four-way valve 17, and the refrigerant inlet of the compressor 14 is connected to the refrigerant flow path. It is connected to the outdoor heat exchanger 15 side for air conditioning.
As a result, the gaseous refrigerant that has been pressurized by the compressor 14 to become high temperature and high pressure is sent to the indoor heat exchanger 13, and heat exchange is performed between the high temperature and high pressure refrigerant and the indoor atmosphere.
The refrigerant sent into the indoor heat exchanger 13 is deprived of heat in the indoor atmosphere and condensed and liquefied, whereby the indoor atmosphere is heated. That is, the indoor heat exchanger 13 functions as a condenser that condenses and liquefies the gaseous refrigerant.

The refrigerant condensed and liquefied by the indoor heat exchanger 13 in this way is expanded and depressurized by the heating expansion valve 16b provided on the downstream side of the indoor heat exchanger 13, and becomes a low-temperature and low-pressure two-phase refrigerant. . This two-phase refrigerant is sent to the air conditioning outdoor heat exchanger 15 provided downstream of the heating expansion valve 16b, and heat exchange is performed with the outside air taken into the outdoor unit 42.
The refrigerant sent into the outdoor heat exchanger 15 for air conditioning takes heat from the outside air taken into the outdoor unit 42 and evaporates to become a low-temperature and low-pressure gaseous refrigerant. That is, the air conditioning outdoor heat exchanger 15 functions as an evaporator that heats and evaporates the liquid refrigerant.
This gaseous refrigerant is sent to the refrigerant inlet of the compressor 14 through the four-way valve 17, is again pressurized by the compressor 14, is sent to the indoor heat exchanger 13, and the above process is repeated.

In the refrigeration apparatus 3, the gaseous refrigerant pressurized to high temperature and high pressure by the compressor 24 is sent to the outdoor heat exchanger 25 for refrigeration and exchanges heat with the outside air taken into the outdoor unit 42. Done. That is, the refrigeration outdoor heat exchanger 25 functions as a condenser.
The liquid refrigerant condensed and liquefied by the refrigeration outdoor heat exchanger 25 in this way is expanded and depressurized by the expansion valve 26 provided on the downstream side of the refrigeration outdoor heat exchanger 25, and is thus low-temperature and low-pressure two-phase. Becomes a refrigerant.

This low-temperature and low-pressure two-phase refrigerant is sent to the indoor heat exchanger 23 to exchange heat with the atmosphere in the refrigerated showcase 21.
The refrigerant sent into the indoor heat exchanger 23 removes heat from the atmosphere in the refrigerated showcase 21 and evaporates, whereby the atmosphere in the refrigerated showcase 21 is cooled. That is, the indoor heat exchanger 23 functions as an evaporator.
The gaseous refrigerant that has passed through the indoor heat exchanger 23 is sent to the refrigerant inlet of the compressor 24, is again pressurized by the compressor 24, and sent to the outdoor heat exchanger 25 for refrigeration, and the above process is repeated. It is.

In the refrigeration apparatus 4, the gaseous refrigerant that has been pressurized by the compressor 34 to a high temperature and high pressure is sent to the refrigeration outdoor heat exchanger 35, and heat exchange is performed between the high temperature and high pressure refrigerant and the outdoor atmosphere. . That is, the freezing outdoor heat exchanger 35 functions as a condenser.
The liquid refrigerant condensed and liquefied by the refrigeration outdoor heat exchanger 35 in this way is expanded and depressurized by an expansion valve 36 provided on the downstream side of the refrigeration outdoor heat exchanger 35, so that two phases of low temperature and low pressure are obtained. Becomes a refrigerant.

The low-temperature and low-pressure two-phase refrigerant is sent to the indoor heat exchanger 33 and heat exchange is performed with the atmosphere in the refrigeration showcase 31.
The refrigerant sent into the indoor heat exchanger 33 takes heat from the atmosphere in the freezer showcase 31 and evaporates, whereby the atmosphere in the freezer showcase 31 is cooled. That is, the indoor heat exchanger 33 functions as an evaporator.
The gaseous refrigerant that has passed through the indoor heat exchanger 33 is sent to the refrigerant inlet of the compressor 34, is again pressurized by the compressor 34, and sent to the outdoor heat exchanger 35 for refrigeration, and the above process is repeated. It is.

In the air conditioning / refrigeration / refrigeration facility 1, the bypass circuit 51 is provided in the refrigerant circuit 12 of the air conditioner 2, so that heat exchange is performed by the air conditioner outdoor heat exchanger 15 during the cooling operation of the air conditioner 2. A part of the performed refrigerant is supplied not to the cooling expansion valve 16a but into the bypass passage 51.
The refrigerant supplied into the bypass flow path 51 is sent to the supercooling expansion valve 52 and decompressed / expanded to be a low temperature / low pressure refrigerant.
The low-temperature and low-pressure refrigerant is sent to the first heat exchange unit 53, and the first heat exchange unit 53 transmits cold heat to the heat storage body in the heat storage container 56. The refrigerant sent to the first heat exchange section 53 takes heat from the heat storage body in the heat storage container 56 and evaporates, whereby the heat storage body in the heat storage container 56 is cooled. That is, the first heat exchange unit 53 functions as an evaporator. Thereafter, the gaseous refrigerant that has passed through the first heat exchanging unit 53 is collected by the accumulator 18, and then sent again to the outdoor heat exchanger 15 for air conditioning by the compressor 14.

  The cold energy stored in the heat storage body in this way is a refrigerant that passes through a portion of the refrigerant circuit 22 of the refrigeration apparatus 3 located between the refrigeration outdoor heat exchanger 25 and the expansion valve 26, and a refrigerant of the refrigeration apparatus 4. In the circuit 32, the refrigerant is transmitted to the refrigerant passing through a portion positioned between the freezing outdoor heat exchanger 35 and the expansion valve 36, and used for further cooling of the refrigerant.

Here, in FIG. 3, the Mollier diagram showing the refrigerating cycle of the refrigerator 3 and the freezing apparatus 4 is shown. In FIG. 3, the state before pressurization by the compressor is indicated by point A, and the state after pressurization is indicated by point B. In addition, a state where heat is exchanged with the outside air that has been sent to each outdoor heat exchanger by the compressor and taken into the outdoor unit 42 is indicated by C ₀ point. Then, a state after being over-cooled by the cold heat stored in the regenerator in the heat storage container 56 and C ₁ point, showing the state of being expanded and decompressed by the electronic expansion valve in point D.
In FIG. 3, for comparison, a refrigeration cycle in a state where supercooling by the cold stored in the heat storage body in the heat storage container 56 is not performed is indicated by a broken line.

As shown in FIG. 3, in the air conditioning / refrigeration / refrigeration facility 1 according to the present embodiment, the refrigerant circulated in the refrigeration cycle formed by the refrigerant circuits 22 and 32 is the refrigeration outdoor heat exchanger 25 and the refrigeration unit, respectively. After being condensed and liquefied by the outdoor heat exchanger 35, it is further cooled by receiving cold heat from the heat storage body and enters a supercooled state.
Then, the enthalpy difference Δh (the amount of change in enthalpy) of the refrigerant increases by the amount of this supercooling between the inlet side and the outlet side of each indoor heat exchanger that constitutes the refrigeration cycle.
That is, in this air conditioning / refrigeration / refrigeration facility 1, in each indoor heat exchanger of the refrigeration apparatus 3 and the refrigeration apparatus 4, compared to the case where the bypass channel 51 and each member provided on the bypass channel 51 are not provided. Since the amount of heat absorbed by the refrigerant increases, the circulation flow rate of the refrigerant can be reduced, and the COP of the refrigeration cycle is higher than before.

As described above, in the air conditioning / refrigeration / refrigeration facility 1, during the cooling operation of the air conditioner 2, a part of the cold generated by the air conditioner 2 with excellent COP is used for refrigeration in the refrigerator 3. The refrigerant condensed and liquefied by the outdoor heat exchanger 25 and the refrigerant condensed and liquefied by the refrigeration outdoor heat exchanger 35 in the refrigeration apparatus 4 are further cooled.
Thereby, the COP of the refrigeration apparatus 3 and the refrigeration apparatus 4 inferior to those of the air conditioner 2 is improved, and the COP of the entire air conditioning / refrigeration / refrigeration equipment 1 is improved.

  Further, the air conditioning / refrigeration / refrigeration facility 1 is generated in the refrigerant circuit 12 of the air conditioner 2 for further cooling of the refrigerant in the refrigerant circuit 22 of the refrigeration apparatus 3 and the refrigerant in the refrigerant circuit 32 of the refrigeration apparatus 4. Since excess cold heat is used, the manufacturing cost and installation space can be reduced as compared with a case where a separate cold heat source is provided for further cooling of the refrigerant in the refrigerant circuits 22 and 32.

In the air conditioning / refrigeration / refrigeration facility 1, the flow rate of the refrigerant supplied into the bypass passage 51 can be controlled by adjusting the opening degree of the supercooling expansion valve 52. Appropriate operation can be performed according to each load of the refrigeration apparatus 3 and the refrigeration apparatus 4.
Specifically, when the load on the first refrigerant circuit is large, the supercooling expansion valve 52 is closed, and the amount of refrigerant flowing into the bypass passage 51 is stopped. Thereby, since all the refrigerant in the refrigerant circuit 12 is used for the cooling operation of the air conditioner 2, it is possible to maximize the cooling capability of the air conditioner 2 and perform a good cooling operation. it can.
Further, when the load of the air conditioner 2 is small, the loads of the refrigeration apparatus 3 and the refrigeration apparatus 4 are also small, and further cooling of the refrigerant in the refrigerant circuits 22 and 32 is unnecessary, the supercooling expansion valve 52 is closed. By using all of the refrigerant in the refrigerant circuit 12 for the cooling operation, the refrigerant circulation amount in the refrigerant circuit 12 can be reduced to reduce the burden on the compressor 14, and the efficiency of the air conditioner 2 is improved.

Further, not only simply opening / closing the supercooling expansion valve 52 but also controlling the opening degree of the supercooling expansion valve 52 enables more detailed control of the operation.
For example, when the degree of opening of the supercooling expansion valve 52 is increased to increase the amount of refrigerant flowing into the bypass passage 51, the amount of heat exchange by the first heat exchange unit 53 increases, and the refrigeration apparatus 3 and the refrigeration apparatus Since the cooling amount of the refrigerant No. 4 increases, the COP of the refrigeration apparatus 3 and the refrigeration apparatus 4 can be improved.
Further, if the opening of the supercooling expansion valve 52 is reduced to reduce the amount of refrigerant flowing into the bypass passage 51, the amount of refrigerant used for the cooling operation in the air conditioner 2 increases. Therefore, the efficiency of the air conditioner 2 and the cooling capacity can be improved.

  The air conditioning / refrigeration / refrigeration facility 1 is provided with a heat storage body that exchanges heat with the refrigerant supplied to the first heat exchanging unit 53, and is provided in the refrigerant circuit 12 of the air conditioner 2. Among the refrigerants circulating in the refrigerant, the cold heat of the refrigerant supplied to the first heat exchanging unit 53 is temporarily stored in the heat storage body to cool the refrigerant in the refrigerant circuit 22 of the refrigeration apparatus 3 and the refrigerant of the refrigeration apparatus 4. This is used for cooling the refrigerant in the circuit 32.

For example, the load of at least one of the refrigerant circuits 22 and 32 temporarily increases to increase the flow rate of the refrigerant, or the load of the refrigerant circuit 12 of the air conditioner 2 temporarily increases to bypass the bypass passage 51. When the supply of the refrigerant to the refrigerant is stopped or the supply amount is reduced, in addition to the cold heat of the refrigerant supplied to the first heat exchanging unit 53, the cold heat stored in the heat storage body is used as the refrigerant circuits 22 and 32. It is used to cool the refrigerant.
Thereby, even if the load of the refrigerant circuit 12 fluctuates, the refrigerant of the refrigerant circuits 22 and 32 can be stably cooled.

  Here, since this heat storage body should just be able to store only the cold heat necessary to make up for the cold heat temporarily insufficient due to the load fluctuation of the refrigerant circuits 12, 22, 32, the heat storage body needs a small amount, Further, since it is not necessary to provide a special heat insulation structure for keeping the heat for a long time, even if this structure is adopted, it is not necessary to increase the size of the air conditioning / refrigeration / freezing equipment.

Further, in the air conditioner 2 of the air conditioning / refrigeration / refrigeration facility 1, a part of the refrigerant that has passed through the indoor heat exchanger 13 is supplied into the bypass flow path 51 when the heating cycle is formed.
The refrigerant supplied into the bypass passage 51 is sent to the supercooling expansion valve 52 to be decompressed / expanded into a low-temperature / low-pressure refrigerant, and the first heat exchanging unit 53 converts the refrigerant into the heat storage body in the heat storage container 56. Supply cold heat.
That is, the cold energy generated by the air conditioner 2 can be stored in the heat storage body even during the heating operation of the air conditioner 2.
Thereby, in this air conditioning / refrigeration / refrigeration facility 1, the refrigerant in the refrigerant circuit 22 of the refrigeration apparatus 3 and the refrigerant circuit 32 of the refrigeration apparatus 4 are not only in the cooling operation of the air conditioner 2 but also in the heating operation. The refrigerant can be supercooled.

Moreover, the refrigerant | coolant which distribute | circulates the inside of the bypass flow path 51 at the time of the heating cycle formation of the air conditioning apparatus 2 absorbs the heat | fever of the refrigerant | coolant in the refrigerant circuits 22 and 32 of the refrigerator 3 and the freezing apparatus 4 via a thermal storage body, Evaporate and vaporize. That is, the first heat exchange unit 53 functions as an evaporator of the refrigerant circuit 12 of the air conditioner 2.
As a result, the temperature of the outdoor heat exchanger 15 for air conditioning is less likely to decrease and becomes close to the outdoor atmosphere temperature, so that the outdoor heat exchanger 15 for air conditioning can be prevented from being frosted, and maintenance work and the number of defrosts can be prevented. Can be reduced.
In addition, the refrigerant | coolant which passed the 1st heat exchange part 53 is again sent to the compressor 14, and is used for heating operation.

Here, in the refrigerant circuit 12 of the air conditioner 2, by controlling the opening degree of the heating expansion valve 16b, the flow direction of at least a part of the refrigerant that has passed through the indoor heat exchanger 13 when the heating cycle is formed is changed. The air conditioner outdoor heat exchanger 15 can be switched to the bypass channel 51.
Specifically, by increasing the opening degree of the heating expansion valve 16b, the amount of refrigerant supplied to the outdoor heat exchanger 15 for air conditioning among the refrigerants that have passed through the indoor heat exchanger 13 during the heating cycle formation is reduced. It decreases and the quantity of the refrigerant | coolant supplied to the bypass flow path 51 increases.
That is, in this air conditioner 2, the heating expansion valve 16b bypasses at least a part of the flow direction of the refrigerant that has passed through the indoor heat exchanger 13 during the heating cycle from the air conditioning outdoor heat exchanger 15. A switching device for switching to the path 51 is configured.

  In addition, by reducing the opening of the heating expansion valve 16b, among the refrigerant that has passed through the indoor heat exchanger 13 during the heating cycle formation, the amount of refrigerant supplied to the outdoor heat exchanger 15 for air conditioning increases. The amount of refrigerant supplied to the bypass channel 51 decreases. Furthermore, by closing the supercooling expansion valve 52 and stopping the refrigerant flow in the bypass flow path 51, all of the refrigerant that has passed through the indoor heat exchanger 13 during the heating cycle formation is transferred to the air conditioning outdoor heat exchanger 15. Supplied.

  Instead of using the heating expansion valve 16b as a switching device, a valve may be provided between the heating expansion valve 16b and the inlet of the bypass passage 51 in the refrigerant circuit 12, and the switching device may be configured by this valve. Good. In this case, the above operation is performed not on the heating expansion valve 16b but on this valve.

Here, as shown in FIG. 4, in the refrigerant circuit 12 of the air-conditioning apparatus 2 shown in the present embodiment, a region located between the inlet of the bypass passage 51 and the cooling expansion valve 16 a is a heat storage container 56. It may be made into the 2nd heat exchange part 57 currently inserted in and performing heat exchange between the refrigerant | coolant which distribute | circulates an inside, and a thermal storage body.
In this case, the refrigerant supplied to the indoor heat exchanger 13 in the refrigerant circuit 12 is further cooled by the cold energy stored in the heat storage body.
That is, the air conditioner 2 compensates for the deficient cooling by the cooling generated by itself even if the load of the cooling cycle of the refrigerant circuit 12 increases rapidly and the required amount of cooling increases rapidly. Can be performed stably.

Moreover, in this Embodiment, the refrigerant circuit 12 of the air conditioning apparatus 2 is made into the 1st refrigerant circuit in which the bypass flow path 51, the subcooling expansion valve 52, and the 1st heat exchange part 53 are provided, Although the refrigerant circuit 22 and the refrigerant circuit 32 of the refrigeration apparatus 4 are shown as the second refrigerant circuit in which the refrigerant is cooled by the excessive cold heat of the first refrigerant circuit, the first and second refrigerant circuits are air Depending on the configuration and operation mode of the harmony device 2, the refrigeration device 3, and the refrigeration device 4, the refrigerant circuits 12, 22, and 32 can be appropriately selected.
For example, when the load fluctuation of the refrigeration apparatus 3 is large and surplus cooling can be expected, the refrigerant circuit 22 of the refrigeration apparatus 3 is used as the first refrigerant circuit, and the surplus cooling is used as the refrigerant circuit 32 of the refrigeration apparatus 4. It can be used for further cooling of the refrigerant.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The air-conditioning / refrigeration / refrigeration facility 61 according to the present embodiment eliminates the heat storage container 56 in the air-conditioning / refrigeration / refrigeration facility 1 according to the first embodiment. Instead, the refrigerant circuit 12 of the air conditioner 2 and the refrigerator 3 The refrigerant circuit 22 and the refrigerant circuit 32 of the refrigeration apparatus 4 are mainly characterized in that some configurations are changed.
Hereinafter, the same or similar configurations as those of the air conditioning / refrigeration / refrigeration facility 1 shown in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the air conditioning / refrigeration / refrigeration facility 61 according to the present embodiment, as shown in FIG. 5, the refrigeration outdoor heat is provided between the refrigeration outdoor heat exchanger 25 and the expansion valve 26 in the refrigerant circuit 22 of the refrigeration apparatus 3. A refrigeration receiver 62 for temporarily storing the refrigerant that has passed through the exchanger 25 is provided.
In the refrigerant circuit 32 of the refrigeration apparatus 4, a refrigeration receiver 63 is provided between the refrigeration outdoor heat exchanger 35 and the expansion valve 36 to temporarily store the refrigerant that has passed through the refrigeration outdoor heat exchanger 35. It has been.
A heat storage body 64 is accommodated in the refrigeration and freezing receivers 62 and 63. In the present embodiment, the heat storage body 64 is a spherical capsule filled with a heat storage material, and a plurality of the heat storage bodies 64 are housed inside the refrigeration receivers 62 and 63 for refrigeration.

  In the refrigerant circuit 12 of the air conditioner 2, a first portion of the refrigerant that has passed through the air conditioning outdoor heat exchanger 15 is supplied to the compressor 14 between the heating expansion valve 16 b and the cooling expansion valve 16 a. A bypass channel 66 and a second bypass channel 67 are provided.

The first bypass passage 66 is provided with a refrigeration side supercooling expansion valve 68, and a part of the region downstream of the refrigeration side supercooling expansion valve 68 is inserted into the refrigeration receiver 62. .
The first bypass passage 66 is inserted into a range where the refrigerant is stored in the refrigeration receiver 62 and is always in contact with the refrigerant. In other words, the region of the first bypass channel 66 that is inserted into the refrigeration receiver 62 exchanges heat between the refrigerant flowing in the first bypass channel 66 and the refrigerant and the heat storage body 64 in the refrigeration receiver 62. The 1st heat exchange part 69 to perform is comprised.

The second bypass passage 67 is provided with a refrigeration side subcooling expansion valve 71, and a part of the region downstream of the refrigeration side subcooling expansion valve 71 is inserted into the refrigeration receiver 63. ing.
The second bypass channel 67 is inserted into a range where the refrigerant is stored in the refrigeration receiver 63 and is always in contact with the refrigerant. That is, in the second bypass channel 67, the region that is inserted into the refrigeration receiver 63 exchanges heat between the refrigerant flowing in the second bypass channel 67, the refrigerant in the refrigeration receiver 63, and the heat storage body 64. The 1st heat exchange part 72 to perform is comprised.

  Further, the first heat exchanging portions 69 and 72 of the first and second bypass flow paths 66 and 67 are respectively meandered, and a sufficient contact area with the refrigerant and the heat storage body 64 is ensured. Thereby, heat exchange is efficiently performed between the refrigerant flowing through the first and second bypass flow paths 66 and 67, the refrigerant in the refrigeration / refrigeration receivers 62 and 63, and the heat storage body 64. It has become.

As described above, in the air conditioning / refrigeration / refrigeration facility 61 according to the present embodiment, the refrigeration and refrigeration receivers 62 and 63 are provided in the first and second bypass passages 66 and 67 of the refrigerant circuit 12 of the air conditioner 2. The area | region inserted by comprises the 1st heat exchange part 69,72.
For this reason, in this air conditioning and refrigeration / refrigeration facility 61, it is not necessary to newly provide a heat exchanger for cooling the refrigerant in the refrigerant circuit 22 of the refrigeration apparatus 3 and the refrigerant circuit 32 of the refrigeration apparatus 4. Installation space can be reduced.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
The air conditioning / refrigeration / refrigeration facility 81 according to the present embodiment is the same as the air conditioning / refrigeration / refrigeration facility 1 according to the first embodiment, except that the refrigerant circuit 12 of the air conditioner 2, the refrigerant circuit 22 of the refrigerator 3, and the refrigeration device 4. This is mainly characterized in that a part of the configuration of each of the refrigerant circuits 32 is changed.
Hereinafter, the same or similar configurations as those of the air conditioning / refrigeration / refrigeration facility 1 shown in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 6, the air conditioning / refrigeration / refrigeration facility 81 according to the present embodiment has a configuration in which a plurality of indoor air conditioning units 11 of the air conditioner 2 are provided in parallel. In other words, the refrigerant circuit 12 of the air conditioner 2 is provided with a plurality of indoor heat exchangers 13 in parallel.
The refrigerant circuit 12 is provided with a valve device 82 for controlling the refrigerant sent from the outdoor heat exchanger 15 for air conditioning to the indoor heat exchanger 13 for each indoor heat exchanger 13.
The valve device 82 includes a stop valve for turning on / off the supply of the refrigerant to the indoor heat exchanger 13 and the cooling expansion valve 16a.

On the other hand, the air-conditioning / refrigeration / refrigeration equipment 81 has a configuration in which a plurality of refrigerated showcases 21 are provided in parallel. In other words, the refrigerant circuit 22 of the refrigeration apparatus 3 is provided with a plurality of indoor heat exchangers 23 in parallel.
The refrigerant circuit 22 is provided with a valve device 83 for controlling the refrigerant sent from the refrigeration outdoor heat exchanger 25 to the indoor heat exchanger 23 for each indoor heat exchanger 23.
The valve device 83 includes a stop valve that turns ON / OFF the supply of the refrigerant to the indoor heat exchanger 23 and the expansion valve 26.

  Further, the refrigerant circuit 22 is provided with a refrigeration-side bypass passage 86 that supplies a part of the refrigerant that has passed through the refrigeration outdoor heat exchanger 25 to the compressor 24. The refrigerating-side bypass passage 86 is provided with a supercooling expansion valve 87 and a first heat exchanging portion 88 in this order from the upstream side. In the present embodiment, the refrigeration side bypass flow path 86 connects a portion located between the refrigeration outdoor heat exchanger 25 and the valve device 83 in the refrigerant circuit 22 to a portion located upstream of the accumulator 28. It is configured.

  The first heat exchange part 88 of the refrigeration side bypass flow path 86 is inserted into the heat storage container 56, and exchanges heat between the refrigerant flowing in the refrigeration side bypass flow path 86 and the heat storage body in the heat storage container 56. Is to be done. Here, the first heat exchanging portion 88 of the refrigeration-side bypass passage 86 is in contact with the heat storage body so that heat exchange between the refrigerant circulating inside and the heat storage body of the heat storage container 56 is efficiently performed. The area is sufficiently secured.

The air conditioning / refrigeration / refrigeration facility 81 includes an air conditioning side pressure measuring device 91 that measures the pressure of the refrigerant on the downstream side of the indoor heat exchanger 13 of the refrigerant circuit 12 and a downstream of the indoor heat exchanger 23 of the refrigerant circuit 22. And a refrigeration side pressure measuring device 92 for measuring the pressure of the refrigerant on the side.
Further, the air conditioning / refrigeration / refrigeration equipment 81 has a control device 93 that controls the operation of the supercooling expansion valves 52 and 87 based on the measured values of the air conditioning side and refrigeration side pressure measuring devices 91 and 92, respectively. doing.
The control device 93 opens the supercooling expansion valve 52 and allows the refrigerant to flow to the bypass flow path 51 when the measured value of the air-conditioning side pressure measuring device 91 is equal to or less than the reference value.
Further, the control device 93 opens the supercooling expansion valve 87 and allows the refrigerant to flow to the refrigeration side bypass passage 86 when the measured value of the refrigeration side pressure measuring device 92 becomes a reference value or less. It is.

Here, the valve device 82 of each indoor air-conditioning unit 11 and the valve device 83 of each refrigerated showcase 21 correspond to the corresponding indoor air-conditioning unit 11 and refrigerated showcase 21 when the indoor atmosphere or the interior atmosphere reaches the target temperature. There is a mechanism to stop or reduce the supply of refrigerant to the indoor heat exchanger when it is necessary to stop the heat exchange by the indoor heat exchanger, such as when defrosting the indoor heat exchanger. Yes.
In other words, the air conditioning / refrigeration / refrigeration facility 81 is configured such that the number of operating indoor air conditioning units 11 and refrigerated showcases 21 varies.

  Here, when the supply of the refrigerant to any one of the indoor heat exchangers 23 of the refrigeration apparatus 3 is stopped or rapidly reduced, the refrigerant pressure rapidly increases on the upstream side of each indoor heat exchanger 23, On the downstream side of the heat exchanger 23, the refrigerant pressure rapidly decreases.

In this air conditioning / refrigeration / refrigeration facility 81, when the refrigerant pressure on the downstream side of the indoor heat exchanger 23 becomes equal to or lower than a predetermined reference value, the controller 93 controls the supercooling expansion valve 87. Has been opened.
That is, when the supply of the refrigerant to the indoor heat exchanger 23 is stopped or rapidly reduced, the refrigerant on the upstream side of the indoor heat exchanger 23 passes downstream of the indoor heat exchanger 23 through the refrigeration bypass channel 86. Therefore, the refrigerant pressure in the refrigerant circuit 22 can be prevented from abnormally rising and falling, and the members constituting the refrigerant circuit 22 can be protected without reducing the amount of refrigerant delivered by the compressor 24. The

  In addition, by allowing the refrigerant to flow into the refrigeration side bypass flow path 86 in this way, the refrigerant flowing through the refrigeration side bypass flow path 86 is decompressed and expanded by the supercooling expansion valve 87, and has a low temperature and low pressure. Refrigerant. The low-temperature and low-pressure refrigerant is sent into the first heat exchanging portion 88 and is heat-exchanged with the heat storage body in the heat storage container 56, so that the excess cold heat of the refrigeration apparatus 3 is stored in the heat storage body, and the refrigeration apparatus 4 The refrigerant is cooled.

Further, in the air conditioning / refrigeration / refrigeration facility 81, when the supply of the refrigerant to one of the indoor heat exchangers 13 of the air conditioner 2 is stopped or rapidly reduced during the cooling operation of the air conditioner 2, The refrigerant pressure rapidly increases on the upstream side of the heat exchanger 13, and the refrigerant pressure rapidly decreases on the downstream side of each indoor heat exchanger 13.
In the air conditioning / refrigeration / refrigeration facility 81, when the refrigerant pressure on the downstream side of the indoor heat exchanger 13 becomes equal to or lower than a predetermined reference value, the supercooling expansion valve 52 is controlled by the control device 93. Has been opened.

  That is, when the supply of the refrigerant to the indoor heat exchanger 13 is stopped or rapidly reduced, the refrigerant on the upstream side of the indoor heat exchanger 13 passes to the downstream side of the indoor heat exchanger 13 through the bypass channel 51. Since the air is released, the refrigerant pressure in the refrigerant circuit 12 is prevented from abnormally rising and falling without reducing the amount of refrigerant delivered by the compressor 14, and each member constituting the refrigerant circuit 12 is protected.

  Thus, in this air conditioning / refrigeration / refrigeration facility 81, each component of the refrigerant circuit is effectively protected by a simpler control than the method of controlling the pressure in the refrigerant circuit by controlling the operation of the compressor. In addition, the operation can be continued at an efficient operation point of the compressor.

Here, in this embodiment, although the air-conditioning side pressure measuring device 91 and the refrigeration side pressure measuring device 92 showed the example provided in the downstream of the indoor heat exchanger, it is not restricted to this, The air-conditioning side pressure measurement The apparatus 91 and the refrigeration side pressure measuring apparatus 92 may be provided on the upstream side of the indoor heat exchanger.
In this case, the control device 93 is configured to open the supercooling expansion valves 52 and 87 when the refrigerant pressure on the upstream side of the indoor heat exchanger becomes equal to or higher than a predetermined reference value.

It is a perspective view which shows the air-conditioning / refrigeration / refrigeration equipment which is an example of application of the combined refrigeration cycle apparatus according to the first embodiment of the present invention. It is a figure which shows the structure of the refrigerant circuit of the air conditioning / refrigeration / refrigeration equipment concerning 1st embodiment of this invention. It is a Mollier diagram which shows the refrigerating cycle of the air-conditioning / refrigeration / refrigeration equipment concerning 1st embodiment of this invention. It is a figure which shows the other structural example of the refrigerant circuit of the air conditioning / refrigeration / refrigeration equipment concerning 1st embodiment of this invention. It is a figure which shows the structure of the refrigerant circuit of the air conditioning / refrigeration / refrigeration equipment concerning 2nd embodiment of this invention. It is a figure which shows the structure of the refrigerant circuit of the air conditioning / refrigeration / refrigeration equipment concerning 3rd embodiment of this invention.

Explanation of symbols

1,61,81 Air conditioning, refrigeration, refrigeration equipment (combined refrigeration cycle equipment)
12 Refrigerant circuit (first refrigerant circuit)
13, 23, 33 Indoor heat exchanger 14 Compressor 15 Outdoor heat exchanger for air conditioning (first outdoor heat exchanger)
16 Expansion valve 16b Expansion valve for heating (switching device)
22, 32 Refrigerant circuit (second refrigerant circuit)
25 Outdoor heat exchanger for refrigeration (second outdoor heat exchanger)
35 Refrigeration outdoor heat exchanger (second outdoor heat exchanger)
51 Bypass Channel 52 Supercooling Expansion Valves 53, 69, 72 First Heat Exchanger 57 Second Heat Exchanger 62 Refrigerating Receiver 63 Refrigerating Receiver 64 Heat Storage Body 66 First Bypass Channel 67 Second Bypass Channel 68 Refrigeration side supercooling expansion valve 71 Refrigeration side supercooling expansion valve 86 Refrigeration side bypass passages 91, 92 Air conditioning side, refrigeration side pressure measuring device 93 Control device

Claims (9)

A combined refrigeration cycle facility having a plurality of independent refrigerant circuits,
A second refrigerant heat circuit in which a compressor, a first outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are arranged in this order, and a second outdoor heat exchanger that acts as a condenser when forming a refrigeration cycle. Each having at least one refrigerant circuit,
The first refrigerant circuit is provided with a bypass flow path for supplying a part of the refrigerant that has passed through the first outdoor heat exchanger to the compressor during refrigeration cycle formation,
In the bypass channel, heat is exchanged between the supercooling expansion valve, the refrigerant flowing through the bypass channel, and the refrigerant passing through the second outdoor heat exchanger of the second refrigerant circuit. A combined refrigeration cycle facility, wherein one heat exchanging section is provided in this order from the upstream side. A pressure measuring device that measures the pressure of the refrigerant in at least one of the upstream side and the downstream side of the indoor heat exchanger of the first refrigerant circuit;
A control device is provided for controlling the opening degree of the supercooling expansion valve based on the measured value of the pressure measuring device;
When the refrigerant pressure on the upstream side of the indoor heat exchanger becomes equal to or higher than the first reference value, or the refrigerant pressure on the downstream side of the indoor heat exchanger becomes equal to or lower than the second reference value. 2. The combined refrigeration cycle equipment according to claim 1, wherein the opening degree of the expansion valve for supercooling is increased. The second refrigerant circuit has a receiver that temporarily stores the refrigerant that has passed through the second outdoor heat exchanger,
The bypass flow path of the first refrigerant circuit is partially inserted into a refrigerant storage range in the receiver, and the insertion portion is the first heat exchange part. The combined air conditioning equipment according to 1 or 2.   The combined refrigeration cycle facility according to any one of claims 1 to 3, further comprising a heat storage body that exchanges heat with the refrigerant supplied into the first heat exchange section.   The first refrigerant circuit is configured to exchange heat between the refrigerant supplied to the indoor heat exchanger when the refrigeration cycle is formed and the refrigerant flowing through the bypass flow path of the first refrigerant circuit. The combined refrigeration cycle equipment according to any one of claims 1 to 4, characterized by comprising:   The first refrigerant circuit has a switching device that switches the flow direction of at least a part of the refrigerant that has passed through the indoor heat exchanger when the heating cycle is formed, from the first outdoor heat exchanger to the bypass flow path. The combined refrigeration cycle facility according to any one of claims 1 to 5, wherein A second refrigerant heat circuit in which a compressor, a first outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are arranged in this order, and a second outdoor heat exchanger that acts as a condenser when forming a refrigeration cycle. A method for operating a combined refrigeration cycle facility having at least one refrigerant circuit,
In a state where the first and second refrigerant circuits each form a refrigeration cycle, a part of the refrigerant that has passed through the first outdoor heat exchanger is decompressed and expanded to form a low-temperature and low-pressure refrigerant, A method for operating a combined refrigeration cycle facility, wherein heat exchange is performed between the first refrigerant and the refrigerant that has passed through the second outdoor heat exchanger of the second refrigerant circuit.   When the load of the first refrigerant circuit is large, or when the load of the first refrigerant circuit is small and the load of the second refrigerant circuit is small, and further cooling of the refrigerant of the second refrigerant circuit is unnecessary The operation method of the combined refrigeration cycle equipment according to claim 7, wherein heat exchange between the refrigerant in the first refrigerant circuit and the refrigerant in the second refrigerant circuit is stopped or reduced. During the refrigeration cycle formation of the first refrigerant circuit, measure the pressure of the refrigerant in at least one of the upstream side and the downstream side of the indoor heat exchanger of the first refrigerant circuit,
When the refrigerant pressure on the upstream side of the indoor heat exchanger becomes equal to or higher than the first reference value, or when the refrigerant pressure on the downstream side of the indoor heat exchanger becomes equal to or lower than the second reference value, The operation method of the combined refrigeration cycle facility according to claim 7 or 8, wherein a part of the refrigerant that has passed through the heat exchanger is supplied to the compressor.

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