JP2016014496A - Refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration system which reduces electric power consumption of an air-cooling refrigeration machine using a carbon dioxide refrigerant and performs efficient operation according to the season.SOLUTION: A refrigeration system includes: a refrigeration cycle circuit 10 forming a refrigeration machine 11 including an air-cooling type gas cooler 13 and using a carbon dioxide refrigerant; and an air conditioning circuit 30 which performs air conditioning with cold water of a water cooling/heating machine 32. The refrigeration cycle circuit 10 includes a supercooling heat exchanger 14 which uses the cold water of the water cooling/heating machine 32 to perform supercooling of the refrigerant discharged from the gas cooler 13.

Description

  The present invention relates to a refrigeration system, and in particular, by using the chilled water of a chiller / heater using exhaust heat, the power consumption of an air-cooled chiller using a carbon dioxide refrigerant can be reduced, and the efficiency is improved according to the season. The present invention relates to a refrigeration system that can perform a good operation.

Conventionally, as a refrigeration system for cooling a low-temperature showcase or the like, a refrigeration system using a vapor compression refrigeration cycle including a compressor, a radiator, a decompressor, and an evaporator has been widely used. In such a refrigeration system, food and the like are cooled and frozen and refrigerated by evaporation of refrigerant in an evaporator of a vapor compression refrigeration cycle.
However, in a widely used refrigeration system, the cooling waste heat from the refrigeration cycle is discarded from the radiator to the atmosphere. On the other hand, hot water used in the same facility is supplied by using a different heat source with a boiler or the like. As described above, the refrigeration system that has been widely used conventionally has a problem that the cooling waste heat is not effectively used.

  Therefore, in such a refrigeration system, as a system that effectively uses cooling exhaust heat, conventionally, for example, a supercooler that supercools the refrigerant after being cooled by the first radiator in the first refrigeration cycle circuit In the subcooler, the refrigerant in the first refrigeration cycle circuit is supercooled by the evaporation of the refrigerant in the second refrigeration cycle circuit different from the first refrigeration cycle circuit, and the second refrigeration cycle circuit A technique is disclosed in which hot water is heated by the heat radiation action of the refrigerant in the second radiator (see, for example, Patent Document 1).

JP 2010-276230 A

The invention described in Patent Document 1 effectively utilizes cooling exhaust heat by supercooling the refrigerant in the first refrigeration cycle circuit by the evaporation of the refrigerant in the second refrigeration cycle circuit.
On the other hand, in recent years, improvement of air-cooled refrigerators using carbon dioxide refrigerant has progressed, and annual power consumption has decreased in the refrigeration area and refrigeration area compared to conventional refrigerators using HFC refrigerant. Yes.
However, air-cooled refrigerators that use carbon dioxide refrigerant have a region that consumes more power than refrigerators that use HFC refrigerant in refrigerated regions at high outside temperatures, such as in summer, and may increase peak power during extreme heat. Therefore, there is a problem that power consumption is increased.

  The present invention has been made in view of the above points, and provides a refrigeration system that can reduce the power consumption of an air-cooled refrigerator using a carbon dioxide refrigerant and can perform an efficient operation according to the season. It is intended to provide.

  In order to achieve the above object, a refrigeration system according to the present invention includes a refrigeration cycle circuit that constitutes a chiller that includes an air-cooled gas cooler and that uses a carbon dioxide refrigerant, an air-conditioning circuit that performs air-conditioning with the cold water of a hot and cold water machine, The refrigeration cycle circuit includes a supercooling heat exchanger that performs supercooling of the refrigerant discharged from the gas cooler using the cold water of the cold / hot water machine.

  According to the present invention, in the above configuration, the air conditioning circuit includes an air conditioning forward pipe that sends cold water from the cold / hot water machine to an air conditioning system, and the supercooling is performed via the cold water forward pipe branched from the air conditioning forward pipe. It is characterized by sending cold water to the heat exchanger.

  According to the present invention, in the above configuration, the air conditioning circuit includes an air conditioning return pipe that returns the cold water from the air conditioning system to the cold / hot water machine, and the supercooling is performed via the cold water forward pipe branched from the air conditioning return pipe. It is characterized by sending cold water to the heat exchanger.

  The present invention is characterized in that, in the above configuration, the cold / hot water machine is a cold / hot water machine using fuel, steam or exhaust heat as a drive heat source.

  The present invention is characterized in that, in the above configuration, as the exhaust heat, heat generated from cogeneration exhaust heat or natural energy is used.

  The present invention is characterized in that, in the above-described configuration, when the air-conditioning operation by the air-conditioning operation is unnecessary, the present invention includes means for blocking the flow of cold water in the air-conditioning forward pipe.

  The present invention is characterized in that, in the configuration described above, when the supercooling by the supercooling heat exchanger is unnecessary, the present invention is provided with means for blocking the flow of the cold water in the cold water outgoing pipe.

  According to the present invention, in the configuration described above, in order to prevent the entire system from being stopped or stopped due to a sudden change in state, or to stop abnormal cooling, supply of cold water to the supercooling heat exchanger is started or stopped. It is characterized by comprising control means for controlling the flow rate of the cold water to be gradually increased or decreased.

  The present invention is characterized in that, in the above-mentioned configuration, the supercooling heat exchanger is disposed at a bottom portion of a space where the gas cooler of the refrigerator is disposed.

  According to the present invention, the refrigeration cycle circuit is provided with a supercooling heat exchanger that supercools the refrigerant discharged from the gas cooler, and the supercooling of the refrigerant in the refrigeration machine is performed using the cold water of the chilled water heater by the supercooling heat exchanger. Therefore, the showcase can be efficiently frozen or refrigerated by the refrigerator. As a result, power saving can be achieved, and contract power can be greatly reduced.

It is a refrigerating cycle figure showing an embodiment of a refrigerating system concerning the present invention. It is a refrigerating cycle figure which shows the exhaust-heat utilization cold / hot water machine in embodiment of the refrigerating system which concerns on this invention. It is the graph which compared the power consumption in embodiment of the refrigeration system which concerns on this invention. It is a graph which shows the electric energy ratio with respect to the external temperature at the time of freezing in embodiment of the refrigeration system which concerns on this invention. It is a graph which shows the electric energy ratio with respect to the external temperature at the time of refrigeration in embodiment of the refrigeration system which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an embodiment of a refrigeration system according to the present invention. In this embodiment, the refrigeration system is installed in a facility having both cooling equipment and air conditioning equipment in a store such as a shopping mall. An example of installation is shown. The refrigeration system of this embodiment includes a refrigeration cycle circuit 10 that cools each showcase 2 installed in a store, and an air conditioning circuit 30 that supplies cold water to the refrigeration cycle circuit 10.

  The refrigeration cycle circuit 10 constitutes a system of the refrigerator 11 and the showcase 2. The refrigeration compressor 12, the gas cooler 13, the supercooling heat exchanger 14, and the refrigeration evaporator 15 are sequentially added to the refrigeration refrigerant. It is configured to be connected by a pipe 16. In the present embodiment, the refrigeration compressor 12, the gas cooler 13, and the supercooling heat exchanger 14 are disposed in the refrigerator 11, and the refrigeration evaporator 15 is disposed in the showcase 2. A blower fan 17 is installed on the top of the refrigerator 11.

In general, the refrigerator 11 includes a partition plate 18 inside, and a lower portion of the partition plate 18 is a machine chamber 19 that houses a machine such as the refrigeration compressor 12, and an upper portion of the partition plate 18 is The heat exchanger chamber 20 is a space in which the gas cooler 13 and the like are arranged. And the gas cooler 13 is installed in the outer surface of the heat exchanger chamber 20, and by operating the ventilation fan 17, external air is taken in through the gas cooler 13, and is discharged | emitted from the upper part of the heat exchanger chamber 20 outside. Is.
Thus, in order to ensure the flow of outside air through the gas cooler 13, a relatively space is secured in the central portion of the partition plate 18 provided at the bottom of the heat exchanger chamber 20. Therefore, by arranging the supercooling heat exchanger 14 near the center of the partition plate 18, the supercooling heat exchanger 14 can be easily installed with respect to the conventional refrigerator 11.

  The high-temperature and high-pressure refrigerant compressed by the refrigeration compressor 12 is cooled by exchanging heat with the outside air flowing in the refrigerator 11 by the blower fan 17 in the gas cooler 13. When the temperature is higher than the critical point of carbon dioxide, the gas cooler 13 does not condense and it is sent out in a supercritical state. This refrigerant is cooled by exchanging heat with the cold water sent from the air conditioning circuit 30 in the supercooling heat exchanger 14 to become a liquid refrigerant, and by exchanging heat with the internal air in the freezing evaporator 15 of the showcase 2. The showcase 2 is configured to be cooled. On the other hand, the cold water in the supercooling heat exchanger 14 is heated by exchanging heat with the refrigerant. In FIG. 1, the refrigeration cycle circuit 10 represents one set, but it is also possible to install a plurality of sets in parallel and circulate supercooled chilled water in parallel to each set.

  Next, the air conditioning circuit 30 constitutes a water circulation type air conditioner 31, and the air conditioner 31 is a chiller / heater 32 using an exhaust heat source 50 such as exhaust hot water, exhaust steam, and exhaust gas. It has. Examples of the exhaust heat source 50 include various exhaust heat sources such as gas engine exhaust heat, gas turbine exhaust heat, fuel cell exhaust heat, and other cogeneration heat sources, gas heat pump exhaust heat, and natural heat such as solar heat. A heat source is considered.

Connected to the chiller / heater 32 are an air-conditioning forward pipe 33 for sending chilled water to an air conditioning system (not shown) and an air-conditioning return pipe 34 for returning the chilled water after performing predetermined air conditioning in the air-conditioning system to the chiller / heater 32. Has been. An air-conditioning pump 35 is provided in the middle of the air-conditioning forward pipe 33, and the cooling air exchange branches off from the air-conditioning forward pipe 33 downstream of the air-conditioning pump 35. A cold water forward pipe 36 connected to the inlet side of the vessel 14 is provided.
On the outlet side of the supercooling heat exchanger 14, a cold water return pipe 37 connected to a midway part of the air conditioning return pipe 34 is provided. An air conditioning on-off valve 38 is provided in the middle of the air-conditioning forward pipe 33, and a cold water on-off valve 39 is provided in the middle of the cold water outgoing pipe 36.

  The air conditioner 31 includes a heating heat exchanger 40 that uses exhaust heat, and the heating heat exchanger 40 is connected to a midway part of the air-conditioning forward pipe 33, and hot water is supplied to the air-conditioning forward pipe 33. A heating forward pipe 41 to be sent and a heating return pipe 42 that branches from a midway part of the air conditioning return pipe 34 and returns the hot water after performing predetermined air conditioning in the air conditioning system to the heating heat exchanger 40 are connected to each other. ing. A heating on-off valve 43 is provided in the middle of the heating return pipe 42.

  The exhaust heat source 50 is provided with an exhaust heat source pipe 51 for circulating the exhaust heat source 50 such as exhaust hot water, and an exhaust heat source pump 52 is provided in the middle of the exhaust heat source pipe 51. . In the middle of the exhaust heat source pipe 51, an exhaust heat source supply pipe 53 for supplying hot water of the exhaust heat source 50 to the chiller / heater 32 and the heating heat exchanger 40 is connected. In the middle part, an exhaust heat source return pipe 54 for returning hot water from the cold / hot water machine 32 and the heating heat exchanger 40 to the exhaust heat source 50 is connected via a cold / hot water three-way valve 55 and a heating three-way valve 56, respectively. Has been.

  Furthermore, in this embodiment, switching control of the cold water on-off valve 39, the air conditioning on-off valve 38, the heating on-off valve 43, the cold / hot water three-way valve 55, and the heating three-way valve 56, the cold / hot water machine 32, and the air conditioning A first controller 60 is provided as control means for performing drive control of the pump 35, the exhaust heat source pump 52, and the blower fan 17. Further, detection values of the outside air temperature sensor 61, the pressure sensor 62 for detecting the pressure of the gas cooler 13 of the refrigerator 11, the refrigerant temperature sensor 63 for detecting the temperature of the refrigerant exiting the gas cooler 13, and the detection of the inside temperature of the showcase 2 are detected. A second controller 64 is provided that sends values to the first controller 60. The first controller 60 is configured to perform various controls based on various detection values sent from the second controller 64.

  For example, the first controller 60 controls the chilled water on / off valve 39 to be closed when the supercooling heat exchanger 14 is not used, such as in winter, and when the air conditioner 31 is in the heating operation, the first controller 60 is opened / closed for heating. The valve 43 and the heating three-way valve 56 are each controlled to be opened [to pass water through the heat exchanger]. Further, the first controller 60 controls the three-way valve 55 for the chiller / heater to be closed [does not pass through the chiller / heater] when the heat source is stable and sufficient during the winter heating operation. Heating may be performed only by the exchanger 40.

The first controller 60 controls the air-conditioning on-off valve 38, the heating on-off valve 43, and the heating three-way valve 56 to be closed when heating by the air conditioner 31 is unnecessary. Further, in the present embodiment, the first controller 60 controls the cooling water temperature and the cooling water flow rate for supercooling so that the total power consumption is equal to or less than the target value while monitoring the total power consumption of the entire system. It has become.
In addition, when the outside air temperature is high, such as in summer, when the first controller 60 supplies cold water to the supercooling heat exchanger 14, the first controller 60 prevents the sudden change in the operating state of the refrigerator 11. Is controlled to gradually increase the amount of cold water sent to the supercooling heat exchanger 14.

Next, the structure of the cold / hot water machine 32 is demonstrated with reference to FIG.
As the chiller / heater 32, various applications such as an exhaust heat input type (direct fire type, steam type or exhaust gas type) absorption chiller / heater, high-temperature / low-temperature water absorption chiller / heater, exhaust heat drive adsorption chiller / warmwater However, in the present embodiment, a case where an exhaust heat input type direct-fire absorption chiller / heater is used will be described.

  The waste heat input type direct fire absorption chiller / heater 32 includes a high temperature regenerator 70, a low temperature regenerator 71, a waste heat regenerator 72, a condenser 73, an evaporator 74, and an absorber 75. Yes. In the present embodiment, the low temperature regenerator 71, the exhaust heat regenerator 72, and the condenser 73 are accommodated in an integral container, and the evaporator 74 and the absorber 75 are accommodated in an integral container. ing.

  The high temperature regenerator 70 burns the burner 76 to heat the rare intermediate absorption liquid sent from the exhaust heat regenerator 72 via the rare intermediate liquid pipe 77, thereby separating the refrigerant vapor from the rare intermediate absorption liquid. The refrigerant vapor is sent to the low temperature regenerator 71 via the refrigerant vapor pipe 78. The diluted intermediate absorbent is concentrated by heating with the burner 76 to become a concentrated intermediate absorbent. The absorbing solution is composed of, for example, a lithium bromide (LiBr) aqueous solution (including a surfactant).

The exhaust heat regenerator 72 scatters the rare absorbent sent from the absorber 75 via the rare absorbent pipe 79 from the rare absorbent dispersion device 80, and heats the rare absorbent with the exhaust warm water sent from the heat source. To make a rare intermediate absorbent. The rare intermediate absorbing liquid is configured to be sent to the high temperature regenerator 70 via the rare intermediate liquid pipe 77.
The low temperature regenerator 71 is configured such that a rare intermediate absorption liquid is sent from a rare intermediate liquid branch pipe 81 branched from the middle of the rare intermediate liquid pipe 77. The liquid exchanges heat with the refrigerant vapor sent from the high-temperature regenerator 70 to become a concentrated absorption liquid. This concentrated absorbent is mixed with the concentrated intermediate absorbent that has exited from the high-temperature regenerator 70 and heat-exchanged with the rare intermediate absorbent, and is installed at the upper portion of the absorber 75 via the concentrated absorbent pipe 82. It is configured to be sprayed from the spraying device 83. On the other hand, the low-temperature regenerator 71 converts the refrigerant vapor into a refrigerant liquid, and exchanges heat with the rare absorbent branch pipe 85 branched from the rare absorbent pipe 79 via the refrigerant drain pipe 84 and is sent to the condenser 73. It is configured.

  A cooling water pipe 86 is inserted into the condenser 73, and the refrigerant vapor inside the condenser 73 is condensed by heat exchange with cooling water passing through the cooling water pipe 86. The refrigerant liquid is sent to the evaporator 74 via the refrigerant liquid pipe 87.

A cold / hot water pipe 88 (corresponding to the air conditioning return pipe 33 and the air conditioning return pipe 34 in FIG. 1) is inserted into the evaporator 74, and the evaporator 74 is placed below the evaporator 74 by a refrigerant pump 89. The stored refrigerant liquid is sprayed from a coolant spraying device 90 installed in the upper part of the evaporator 74. The cold / hot water flowing through the cold / hot water pipe 88 is configured to be cooled by exchanging heat with the refrigerant liquid sprayed from the refrigerant spraying device 90. The liquid refrigerant is vaporized by heat exchange with cold / hot water in the evaporator 74 and flows into the absorber 75 as refrigerant vapor.
A cooling water pipe 86 is inserted into the absorber 75, and in the absorber 75, the refrigerant vapor flowing from the evaporator 74 is absorbed by the concentrated absorbing liquid sprayed from the concentrated absorbing liquid spraying device 83 and has a low concentration. At the same time, heat is exchanged with the cooling water flowing through the cooling water pipe 86 to become a low-temperature rare absorbent.
The inlet side and the outlet side of the cooling water pipe 86 are connected to a cooling water device such as a cooling tower (not shown).
In this manner, the exhaust heat input type absorption chiller / heater 32 can efficiently cool the chilled / hot water in the chilled / hot water pipe 88 using the discharged warm water.

Next, the operation of the refrigeration system in the present embodiment will be described.
First, the first controller 60 controls the chilled / hot water three-way valve 55 to open, the chilled water on / off valve 39 to open, and the heating on / off valve 43 to be closed, and the chilled / hot water machine 32, the exhaust heat source pump 52, and the air conditioner. The pump 35 is operated. Thus, the chilled water cooled by the chiller / heater 32 is sent to the air conditioning system by the air conditioning pump 35 via the air conditioning forward piping 33 and a part of the cold water is supercooled via the cold water forward piping 36. It is sent to the heat exchanger 14.
On the other hand, by operating the refrigeration compressor 12, the carbon dioxide refrigerant is compressed and sent to the gas cooler 13. The gas cooler 13 exchanges heat with the outside air, cools it, and sends it as a high-pressure refrigerant to the supercooling heat exchanger 14. It is done. Then, the supercooling heat exchanger 14 exchanges heat with the cold water sent via the cold water forward pipe 36 to supercool the refrigerant, and sends the refrigerant to the freezing evaporator 15 of the showcase 2. The interior air of the showcase 2 is cooled by exchanging heat with the interior air. The chilled water exiting the supercooling heat exchanger 14 is returned to the chiller / heater 32 via the chilled water return pipe 37 and the air conditioning return pipe 34.

In addition, when heating is performed in winter or the like, the heating on-off valve 43 is controlled to be opened and the heating three-way valve 56 is controlled to be opened. As a result, the exhaust hot water from the exhaust heat source 50 is sent to the heating heat exchanger 40 via the exhaust heat source supply pipe 53, and heat exchange is performed between the exhaust hot water and the cold water sent through the air conditioning return pipe 34. Is sent to the air conditioning system via the air conditioning outlet pipe 33.
In this case, when heat exchange by the supercooling heat exchanger 14 is not necessary in the winter season, the first controller 60 controls the chilled water on-off valve 39 to be closed. If the temperature is stable and sufficient, the cold / hot water three-way valve 55 is controlled to be closed, and heating is performed only by the heating heat exchanger 40.

  As described above, in the present embodiment, since the refrigerant in the refrigerator 11 is supercooled using the cold water of the cold / hot water machine 32 using the exhaust heat source 50, the refrigerator 11 is more efficient. The showcase 2 can be frozen or refrigerated. In other words, in general, refrigeration and refrigeration equipment that operates continuously throughout the year rather than an air conditioner that operates only for a certain period of time throughout the year is a system with large seasonal fluctuations. Whereas it is three times or more, in the present invention, it can be reduced to about twice. As a result, power saving can be achieved, and contract power can be greatly reduced. Moreover, since the refrigeration system of the present invention operates continuously throughout the year, the exhaust heat source 50 can be used effectively over a long period of time.

  Further, when the temperature of the chilled water sent from the chiller / heater 32 is about 15 ° C. to 20 ° C., it cannot be used for air conditioning. However, when chilled water is used in the supercooling heat exchanger 14, Even with cold water at a proper temperature, sufficient effects can be obtained, and even when the temperature of the exhaust heat source 50 is low, the exhaust heat source 50 can be used efficiently. Further, even when the exhaust heat source 50 is stopped, the cooling of the refrigerator 11 can be stably performed by the cold water of the cold / hot water machine 32.

  Moreover, at the time of high outside air temperature such as midsummer, the power consumption of the refrigerator 11 using the carbon dioxide refrigerant having a large decrease in COP can be reliably reduced, and the contract power consumption of the entire system can be reduced. Further, at high outside temperatures such as midsummer, the refrigerant temperature exceeds the critical temperature (31 ° C.) of carbon dioxide in the gas cooler 13 of the refrigerator 11 using the carbon dioxide refrigerant, so that condensation does not occur and a supercritical state occurs. Therefore, the supercooling heat exchanger 14 provided on the downstream side of the gas cooler 13 is responsible for not only the supercooling of the liquid refrigerant but also the condensation. Therefore, a larger effect can be obtained than when the supercooling heat exchanger 14 is installed in the refrigerator 11 using a refrigerant such as a conventional HFC.

  Furthermore, when the waste heat source 50 is cogeneration waste heat, the amount of power purchased corresponding to the reduction in power consumption of the refrigerator 11 by the chiller / heater 32 using the waste heat as well as in-house power generation by cogeneration. The power consumption can be greatly reduced. In addition, if it is expected that the refrigerator 11 is always operated by the supercooling heat exchanger 14 at a high outside air temperature, the capacity of the refrigerator 11 can be reduced, and thereby the initial cost can be reduced. Become.

  Moreover, since the system of the cold / hot water machine 32 and the refrigerator 11 which are individually independent is a system connected by the cold water pipe line, the legal refrigeration tonnage is not added up. High capacity system can be combined without receiving. Furthermore, since the supercooling heat exchanger 14 is installed inside the refrigerator 11, compared to the case where the supercooling heat exchanger 14 is installed outside the refrigerator 11, local refrigerant piping work and installation space are required. Can be reduced.

  FIG. 3 shows the results when the monthly power consumption in the refrigerator 11 is measured and the peak time (August) is set to 1. According to this result, from May to October, FIG. It can be seen that the power consumption of the refrigerator 11 is significantly reduced and the efficiency is increased.

  FIG. 4 and FIG. 5 show the relationship between the ratio of the electric energy per day and the daily average outside air temperature when the refrigeration condition is −40 ° C. and when the refrigeration condition is −10 ° C. . According to this result, in any case, it is shown that the electric energy ratio of the refrigerator 11 of the present invention is lower than that of the conventional refrigerator 11. Further, when the subcooling heat exchanger 14 according to the present invention is used for supercooling, the power ratio is maintained at about 60% even when the outside air temperature is 16 ° C. or higher. It can be seen that the amount of power of the refrigerator 11 of the present invention is reduced and the efficiency is increased.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible based on the meaning of this invention.

DESCRIPTION OF SYMBOLS 2 Showcase 10 Refrigeration cycle circuit 11 Refrigeration machine 12 Refrigeration compressor 13 Gas cooler 14 Supercooling heat exchanger 15 Refrigeration evaporator 16 Refrigeration refrigerant piping 17 Blower fan 18 Partition plate 30 Air conditioning circuit 31 Air conditioner 32 Cooling / heating machine 33 Air Conditioning Outlet Pipe 34 Air Conditioning Return Pipe 35 Air Conditioning Pump 36 Cold Water Outward Piping 37 Cold Water Return Pipe 38 Air Conditioning On / Off Valve 39 Cold Water On / Off Valve 40 Heating Heat Exchanger 41 Heating Outward Piping 42 Heating Return Piping 43 Heating On / Off Valve 50 Waste Heat Source 51 Waste Heat Source Pipe 52 Waste Heat Source Pump 53 Waste Heat Source Supply Pipe 54 Waste Heat Source Return Pipe 55 Three-Way Valve for Chilled and Hot Water Machine 56 Three-way Valve for Heat Exchanger 60 First Controller 64 Second Controller 70 High-temperature regenerator 71 Low-temperature regenerator 72 Waste heat regenerator 73 Condenser 74 Evaporator 75 Osamuki

Claims (9)

A refrigeration cycle circuit that constitutes a refrigerator using a carbon dioxide refrigerant with an air-cooled gas cooler, and an air-conditioning circuit that performs air-conditioning with the cold water of the cold / hot water machine,
The said refrigeration cycle circuit is provided with the supercooling heat exchanger which supercools the refrigerant | coolant which came out of the said gas cooler using the cold water of the said cold / hot water machine.   The air conditioning circuit includes an air conditioning forward pipe that sends cold water from the cold / hot water machine to an air conditioning system, and sends cold water to the supercooling heat exchanger via a cold water forward pipe branched from the air conditioning forward pipe. The refrigeration system according to claim 1.   The air-conditioning circuit includes an air-conditioning return pipe that returns chilled water from an air-conditioning system to the chiller / heater, and sends chilled water to the supercooling heat exchanger via a chilled water return pipe branched from the air-conditioning return pipe. The refrigeration system according to claim 1.   The refrigeration system according to any one of claims 1 to 3, wherein the chiller / heater is a chiller / heater that uses fuel, steam, or exhaust heat as a drive heat source.   The refrigeration system according to claim 4, wherein the chiller / heater uses heat generated from cogeneration exhaust heat or natural energy as the exhaust heat.   The refrigeration according to any one of claims 1 to 5, further comprising means for interrupting a flow of cold water in the air-conditioning forward pipe when an air-conditioning operation by the air-conditioning circuit is unnecessary. system.   The apparatus according to any one of claims 1 to 6, further comprising means for interrupting a flow of cold water in the chilled water outgoing pipe when supercooling by the supercooling heat exchanger is unnecessary. The refrigeration system described.   When cold water is supplied to the supercooling heat exchanger at a high outside air temperature, control means is provided for controlling to gradually increase the amount of cold water sent to the supercooling heat exchanger. The refrigeration system according to any one of claims 1 to 7.   Gradually increase the flow rate of cold water sent to the supercooling heat exchanger when starting or stopping the supply of cold water to the supercooling heat exchanger in order to prevent the entire system from starting and stopping and abnormal stopping due to sudden changes in state Or a refrigeration system according to any one of claims 1 to 8, further comprising control means for controlling to gradually decrease.

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