JP6344686B2 - Refrigeration system - Google Patents

Description

  The present invention relates to a refrigeration system, and in particular, by combining a plurality of refrigeration cycles and switching a cooling water circulation circuit, cooling or heating can be performed efficiently, and efficient operation is performed according to the season. The present invention relates to a refrigeration system that makes it possible.

  Conventionally, in stores such as supermarkets and convenience stores, refrigeration cycle circuits have been used, such as refrigerators for cooling low-temperature showcases, hot water supply devices for supplying hot water to various places, and air conditioners for indoor air conditioning. Many systems were used. The refrigeration cycle of such a system generally cools or heats by circulating a refrigerant and exchanging heat with outside air or the like.

  In such a refrigeration cycle, heat exchange efficiency is improved by exchanging heat between the refrigerant and the cooling water. As such a technique, conventionally, for example, in a refrigerated warehouse, a compressor, a water-cooled condenser, a high-pressure receiver, an expansion valve, and a CO2 liquefier constituting an NH3 / CO2 refrigeration apparatus are sequentially provided. A technique is disclosed in which cooling water connected by a refrigerant pipe and supplied to a water-cooled condenser by cooling water cooled by a cooling tower is supplied by a cooling water pump (for example, see Patent Document 1).

JP 2012-102946 A

  In the invention described in Patent Document 1, heat is exchanged with the refrigerant by supplying cooling water to the water-cooled condenser constituting the refrigeration apparatus. As described above, when heat exchange is performed, heat exchange with cooling water or air is performed by the apparatus, but cooling or heating can be efficiently performed by combining a circulation circuit of cooling water or refrigerant. There has been no refrigeration system in the past. In addition, if a large-scale refrigeration system is configured by combining a circulation circuit such as a refrigerant, the refrigerant circulation piping becomes complicated, the manufacturing cost increases, and the legal refrigeration tonnage increases, resulting in high pressure. It has the problem of being subject to the regulations of the Gas Safety Law.

  On the other hand, the refrigerator has a problem that, for example, when the outside air temperature is high such as in summer, the heat exchange efficiency in the refrigerator is reduced, so that the cooling efficiency in the refrigerator is significantly reduced. This is more remarkable when a carbon dioxide refrigerant is used as the refrigerant of the refrigerator.

  The present invention has been made in view of the above points, and can be efficiently cooled or heated by combining a circulating circuit of cooling water or a refrigerant, and can perform an efficient operation according to the season. It aims to provide a refrigeration system.

In order to achieve the above object, a refrigeration system according to the present invention includes a first refrigeration cycle circuit 10 constituting a refrigerator equipped with a gas cooler, and a first heat exchange in the gas cooler by cooling water cooled by a cooling tower. 2 refrigeration cycle circuit 20 and a chiller air conditioning circuit 30 that performs air conditioning with cold water sent from the chiller, a return cold water branch pipe that branches from the air conditioning cold water pipe of the chiller air conditioning circuit, and a forward header of the chiller air conditioning circuit Or a cooling water branch pipe connected to the return header, and circulates the heat of the water circulating in the return cold water branch pipe and the cooling water branch pipe through the cooling water pipe in the second refrigeration cycle circuit. together utilizing the cooling water is intended to be used for heating in the chiller air conditioning circuit, in accordance with the Chirahita operation mode, before Or send the cooling water of the cooling water branch pipe to the forward header, or characterized by comprising a control means for switching between the sending to the return header.

  According to the present invention, in the above configuration, the return chilled water branch pipe is connected to a cooling water pipe on the upstream side of the gas cooler in the second refrigeration cycle circuit, and the cooling water branch pipe is connected to the downstream side of the gas cooler. It is characterized by branching.

  According to the present invention, in the above configuration, the return chilled water branch pipe and the cooling water branch pipe are connected to a cooling water heat exchanger connected to a cooling water pipe on the upstream side of the gas cooler in the second refrigeration cycle circuit. It is characterized by being.

  The present invention is characterized in that, in the above configuration, the control means switches so that the cooling water of the cooling water branch pipe is sent to the return header during the chiller cooling operation.

  The present invention is characterized in that, in the above-mentioned configuration, the control means switches so that the cooling water of the cooling water branch pipe is sent to the forward header when the large-sized chiller heater is stopped in the winter season or when the radiant heating operation is performed.

  According to the present invention, in the configuration described above, when the chiller air conditioning circuit stops a cooling water pump provided in the second refrigeration cycle circuit, the chiller air conditioning circuit supplies cold water via the cooling water branch pipe and the return cold water branch pipe. An air-conditioning pump that circulates in the second refrigeration cycle circuit is provided.

  The present invention is characterized in that, in the above-mentioned configuration, the control means performs the heating preheating operation by sending the cooling water of the second refrigeration cycle circuit to the forward header when the chiller heater is stopped.

  According to the present invention, in the configuration described above, a flow rate adjustment valve is provided in the cooling water branch pipe or the return cold water branch pipe, and the control means opens the flow rate adjustment valve so that the pressure of the gas cooler becomes a predetermined pressure. It is characterized by controlling the degree.

  According to the present invention, in the configuration described above, a flow rate adjustment valve is provided in the cooling water branch pipe or the return cold water branch pipe, and the control means sets a reference value with a constant total power consumption of the refrigerator and the chiller air conditioning circuit. When it exceeds, the opening degree of the flow control valve is controlled so as to increase the cooling water circulated from the chiller air conditioning circuit to the second refrigeration cycle circuit.

  The present invention is characterized in that, in the configuration described above, a water tank internal heat exchanger connected to a cooling water pipe from the gas cooler is installed in a water tank for storing water for spraying in the cooling tower.

  The present invention is characterized in that, in the above configuration, a valve for bypassing the cooling tower is provided in an inlet pipe or an outlet pipe of the cooling tower.

  According to the present invention, the heat of the cooling water circulating through the return cold water branch pipe and the cooling water branch pipe is used for the cooling water circulating through the cooling water pipe in the second refrigeration cycle circuit. Or in an air conditioning apparatus, efficient cooling or heating can be performed. Moreover, since the cold water which returns to a chiller is utilized for a 2nd refrigerating cycle circuit, the increase in the freezing burden to a chiller can be made small. Furthermore, since the efficiency of the refrigerator or air conditioner is improved by changing the cooling water circulation path, only the cooling water circulation pipe need be installed, and the legal refrigeration tonnage will not increase. Therefore, a large capacity system can be combined without being restricted by the High Pressure Gas Safety Law. In addition, by allowing the cooling tower to be bypassed, only cooling water from the chiller, only cooling water from the cooling tower, and cooling water from the chiller and cooling tower are used to cool the gas cooler. It is possible to select the case of using together.

It is a refrigerating cycle figure in the state where the cold water of a chiller and the cooling water of a freezer which show a 1st embodiment of the refrigerating system concerning the present invention are mixed. It is the graph which compared the power consumption in 1st Embodiment of the refrigerating system which concerns on this invention. It is a refrigerating cycle figure in the state where the cold water of a chiller and the cooling water of a freezer which show a 2nd embodiment of the refrigerating system concerning the present invention are not mixed.

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

  FIG. 1 shows a first embodiment of a refrigeration system according to the present invention. In this embodiment, the refrigeration system includes both a cooling facility and an air conditioning facility in a store such as a shopping mall. An example of installation in a facility is shown. The refrigeration system of the present embodiment includes a first refrigeration cycle circuit 10 that cools each showcase 2 installed in a store, and a second refrigeration that cools the refrigerant of the first refrigeration cycle circuit 10 with cooling water. A cycle circuit 20 and a chiller air conditioning circuit 30 for supplying cold water as cooling water to the second refrigeration cycle circuit 20 are provided.

  The first refrigeration cycle circuit 10 constitutes the system of the refrigerator 4 and the showcase 2. The refrigeration compressor 11, the gas cooler 12, the refrigeration expansion valve 13, and the refrigeration evaporator 14 are sequentially refrigerated. The refrigerant pipes 15 are connected to each other. In the present embodiment, the refrigeration compressor 11 and the refrigeration condenser are arranged in the refrigeration machine 4, and the refrigeration expansion valve 13 and the refrigeration evaporator 14 are arranged in the showcase 2.

  Further, the gas cooler 12 is opposed so that the refrigerant flowing through the refrigerant refrigerant pipe 15 of the first refrigeration cycle circuit 10 and the cooling water flowing through the cooling water pipe of the second refrigeration cycle circuit 20 flow. The refrigerant flowing through the refrigeration refrigerant pipe 15 and the cooling water flowing through the cooling water pipe are configured to be able to exchange heat with each other. Then, the high-temperature and high-pressure refrigerant compressed by the refrigeration compressor 11 is cooled by exchanging heat with the cooling water of the second refrigeration cycle circuit 20 by the gas cooler 12, and becomes a liquid refrigerant through the refrigeration expansion valve 13. The refrigeration evaporator 14 of the showcase 2 is configured to cool the showcase 2 by exchanging heat with the internal air.

  Here, in the first refrigeration cycle circuit 10 in the present embodiment, carbon dioxide is used as the refrigerant. In the refrigeration cycle using carbon dioxide refrigerant, since the high pressure side is a transcritical cycle exceeding the critical pressure of the refrigerant, the refrigerant pressure flowing through the refrigeration refrigerant pipe 15 of the gas cooler 12 exceeds the critical pressure. The temperature of the refrigerant flowing through the refrigeration refrigerant pipe 15 of the gas cooler 12 decreases as the water flowing opposite the cooling water pipe 23 is cooled by cooling. Thereby, the water which flows through the piping 23 for cooling water can be heated.

  Next, the second refrigeration cycle circuit 20 includes a gas cooler 12 constituting the first refrigeration cycle circuit 10, a cooling water two-way valve 61 for bypassing the cooling tower 21, the cooling tower 21, and the cooling water pump 22. The cooling water pipes 23 are sequentially connected. The cooling tower 21 is a cooling tower body 25 installed outside the room, a cooling tower fan 26 for introducing outside air into the cooling tower body 25, and spray water stored in a water tank 27 below the cooling tower 21. A watering pump 28 for spraying from the top of the cooling tower, a heat exchanger 24 installed in the cooling tower body, and a water tank heat exchanger 29 installed in the water tank and connected to the heat exchanger 24. Yes. In addition, on-off valves 45 and 45 are connected to the outlet side and the inlet side of the cooling tower 21 of the cooling water pipe 23 of the cooling tower 21, respectively.

  Then, by operating the watering pump 28, the spraying water is sprayed from the upper part of the cooling tower body 25, and the spraying water is exchanged by heat exchange between the sprayed spraying water and the outside air introduced by the cooling tower fan 26. It is what cools. And while exchanging heat with the cooling water which flows through the heat exchanger 29 in an aquarium with the spraying water stored in the water tank, the cooling water is exchanged with the cooling water flowing through the heat exchanger 24 by the cooled spraying water. It is configured to perform cooling. The cooling water cooled in this way is sent to the gas cooler 12 by the cooling water pump 22, and performs heat exchange with the refrigerant flowing through the refrigerating refrigerant pipe 15 of the refrigerator 4 by the gas cooler 12.

  Next, the chiller air-conditioning circuit 30 constitutes the water circulation type air conditioner 6, and includes, for example, an absorption type, a turbo type, an electric type, a GHP chiller 31, a forward header 32, a return header 33, and an air conditioning unit. The pump 34 is sequentially connected by an air-conditioning cold water pipe 35. Between the forward header 32 and the return header 33, a plurality of radiation panels (or fan coils) 37 that are installed in the plurality of air-conditioned spaces 36 and exchange heat with the air in the air-conditioned spaces 36 are provided. On the downstream side, secondary pumps 38 that send cold water or hot water to each radiation panel (or fan coil) 37 are provided.

  The return header 33 is connected to a cooling water branch pipe (for chiller cooling operation) 40 branched from the cooling water pipe 23 on the downstream side of the gas cooler 12. Is connected to a cooling water branch pipe (for heating) 41 connected to an air conditioning cold water pipe 35 on the upstream side of the forward header 32. Further, a return cold water branch pipe 42 connected to the cooling water pipe 23 on the upstream side of the gas cooler 12 is connected between the air conditioning pump 34 and the chiller 31. An on-off valve (opened when chiller cold water is used as cooling water for the refrigerator) 46 is provided in the middle of the cooling water branch pipe 40, and an on-off valve (radiant heating) is provided in the middle of the cooling water branch pipe 41. Or for heating preheating operation when the chiller heater is stopped) 47 is provided. Furthermore, a flow rate adjusting valve 48 is provided in the middle of the return cooling water branch pipe 42.

  Furthermore, in this embodiment, the controller 50 as a control means for performing switching control of the on-off valves 46 and 47 and the flow rate adjusting valve 48 and driving control of the cooling water pump 22, the water spray pump 28 and the cooling tower fan 26 is provided. The controller 50 includes an outside air temperature sensor 51, a pressure sensor 52 that detects the pressure of the gas cooler 12 of the refrigerator 4, and a cooling water temperature sensor 53 that detects the temperature of the cooling water flowing into the gas cooler 12. Various controls are performed based on the value.

  Here, in the present embodiment, the cold water of the chiller air-conditioning circuit 30 is used as the cooling water of the second refrigeration cycle circuit 20. Specifically, for example, when the outside air temperature sensor 51 detects that the outside air temperature is high, such as in summer, the controller 50 is configured to control to open and close the on-off valve 46 and close the on-off valve 47. . As a result, the cooling water sent from the cooling tower 21 to the gas cooler 12 and heat-exchanged by the gas cooler 12 is sent to the return header 33 and then returned to the cooling water pipe 23 and used as cooling water for the cooling water pipe 23. Will be able to.

  Further, for example, when the outside air temperature sensor 51 detects that the outside air temperature is low, such as in winter, the controller 50 is configured to control the switching of the on-off valve 46 to be closed and the on-off valve 47 to be opened. Thereby, the cooling water sent from the cooling tower 21 to the gas cooler 12 and heat-exchanged by the gas cooler 12 is sent to the outgoing header 32, used as hot water of the chiller air-conditioning circuit 30, and heat-exchanged by the radiation panel 37. It will return to the piping 23, and the exhaust heat of the refrigerator 4 can be utilized as a radiant heating heat source.

  When the outside air temperature is detected by the outside air temperature sensor 51 and the control by the controller 50 is performed, when the outside air temperature is not high or low such as spring or autumn, for example, cooling by the cooling water temperature sensor 53 in the gas cooler 12 is performed. The water temperature, the pressure of the gas cooler 12 by the pressure sensor 52, and the temperature of the cooling tower 21 may be comprehensively judged and controlled, or the control may be switched by a changeover switch between summer and winter. It may be.

  Further, when the controller 50 operates the air conditioning pump 34 to send the cooling water from the return chilled water branch pipe 42 to the cooling water pipe 23, the controller 50 stops the cooling water pump 22, and only the air conditioning pump 34 performs cooling water. You may make it control to circulate. By controlling in this way, even if the cooling water pump 22 is stopped, the cold water circulating through the chiller air conditioning circuit 30 can be circulated through the cooling water pipe 23, and the driving power can be reduced. is there. Moreover, by controlling in this way, for example, even when the on-off valves 45 are closed during maintenance or failure of the cooling tower 21, the cooling water can be circulated without stopping the refrigerator 4. It can be done.

  Further, the controller 50 controls the cooling water in the piping 23 for cooling water to be sent to the forward header 32 when the chiller air conditioning circuit 30 is stopped in a heating system using a fan coil or the like, so that the heating preheating operation is performed. Also good. By controlling in this way, since the cooling water heated and exchanged by the gas cooler 12 is sent to the forward header 32, even if the chiller air-conditioning circuit 30 is not used, the air-conditioned space 36 is prevented from being excessively lowered. It becomes possible.

  Further, the controller 50 may control the opening degree of the flow rate adjustment valve 48 so that the pressure of the gas cooler 12 of the refrigerator 4 detected by the pressure sensor 52 becomes a predetermined pressure. The controller 50 also reduces the power consumption of the refrigerator 4 having a low primary energy conversion COP so that the total power consumption of the refrigerator 4 and the air conditioner 6 exceeds a certain reference value. Alternatively, the opening degree of the flow rate adjustment valve 48 may be controlled so as to increase the cooling water to be circulated to the cooling water pipe 23.

Next, the operation of the refrigeration system in the present embodiment will be described.
First, an operation when the outside air temperature is high such as in summer will be described.
In this case, the controller 50 controls the opening / closing valve 46 to be opened and the opening / closing valve 47 to be closed, and the cooling tower fan 26, the water spray pump 28 and the cooling water pump 22 are operated. As a result, the cooling water cooled in the cooling tower 21 is sent to the gas cooler 12 via the cooling water pipe 23 by the cooling water pump 22, and exchanges heat with the refrigerant flowing in the refrigerant refrigerant pipe 15 in the gas cooler 12.

  Then, a part of the cooling water exiting the gas cooler 12 returns to the cooling tower 21 via the cooling water pipe 23, and a part thereof is sent to the return header 33 via the cooling water branch pipe 40 and is sent by the radiation panel 37. The heat-exchanged cold water is returned to the chiller 31 and returned to the cooling water pipe 23 via the return cold water branch pipe 42. Therefore, in this embodiment, since the cold water of the chiller air-conditioning circuit 30 can be used as the cooling water to exchange heat with the gas cooler 12, heat exchange in the gas cooler 12 can be performed efficiently, and the refrigeration refrigerant pipe 15 is It is possible to further cool the flowing refrigerant. As a result, the inside air can be further cooled in the freezing evaporator 14 of the showcase 2.

Next, the operation in winter will be described.
In this case, the controller 50 controls the on-off valve 46 to be closed and the on-off valve 47 to be opened, and the cooling tower fan 26, the watering pump 28 and the cooling water pump 22 are also operated. As a result, the cooling water cooled in the cooling tower 21 is sent to the gas cooler 12 via the cooling water pipe 23 by the cooling water pump 22, and exchanges heat with the refrigerant flowing in the refrigerant refrigerant pipe 15 in the gas cooler 12. In this case, when the outside air temperature is low, since the load on the gas cooler 12 is small, the refrigerant flowing through the refrigeration refrigerant pipe 15 can be sufficiently cooled.

  On the other hand, the cooling water heat-exchanged in the gas cooler 12 is sent to the forward header 32 via the cooling water branch pipe 41 and exchanges heat with the air in the air-conditioned space 36 via the radiation panel 37. In this case, in the present embodiment, since the cooling water sent from the gas cooler 12 is warmed by heat exchange, the radiation panel 37 performs efficient air conditioning using the exhaust heat of the cooling water. Can do. Thereafter, the cooling water heat-exchanged by the radiation panel 37 is returned to the chiller 31 and is returned to the cooling water pipe 23 via the return cold water branch pipe 42.

  In the present embodiment, when the controller 50 operates the air conditioning pump 34 to return the cooling water from the return cold water branch pipe 42 to the cooling water pipe 23, the cooling water pump 22 is stopped and the air conditioning pump 34 is turned on. Control is performed so that the cooling water is circulated only by the pump 34. By controlling in this way, even if the cooling water pump 22 is stopped, the cooling water circulating through the chiller air-conditioning circuit 30 can be circulated through the cooling water pipe 23 and the driving power can be reduced. It is. Moreover, by controlling in this way, for example, even when the on-off valve 45 is closed during maintenance or failure of the cooling tower 21, the cooling water can be circulated without stopping the refrigerator 4. Thus, the cooling water of the chiller air conditioning circuit 30 can be effectively used as the backup cooling water of the second refrigeration cycle circuit.

  Moreover, when the chiller air-conditioning circuit 30 is stopped by the controller 50, the cooling water of the cooling water pipe 23 may be sent to the forward header 32 so as to perform the heating preheating operation. By controlling in this way, since the cooling water heated and exchanged by the gas cooler 12 is sent to the forward header 32, even if the chiller air-conditioning circuit 30 is not used, the air-conditioned space 36 is prevented from being excessively lowered. It becomes possible.

  Further, the controller 50 may control the opening degree of the flow rate adjusting valve 48 so that the pressure of the gas cooler 12 of the refrigerator 4 detected by the pressure sensor 52 becomes a predetermined pressure. In addition, when the total power consumption of the refrigerator 4 and the chiller air conditioning circuit 30 exceeds a certain reference value by the controller 50, the chiller air conditioning circuit 30 is configured to reduce the power consumption of the refrigerator 4 having a low primary energy conversion COP. Alternatively, the opening degree of the flow rate adjustment valve 48 may be controlled so as to increase the amount of cold water circulated to the cooling water pipe 23.

  As described above, in this embodiment, when the outside air temperature is high, the cooling water that has exited the gas cooler 12 is sent to the return header 33 via the cooling water branch pipe 40, and the radiation panel (or fan coil) 37. Since the cooling water is returned to the cooling water pipe 23 via the return cold water branch pipe 42 together with the cold water heat-exchanged by the above, it is possible to use the cold water of the chiller air conditioning circuit 30 as the cooling water to be heat-exchanged by the gas cooler 12. Thus, heat exchange in the gas cooler 12 can be performed efficiently, and the refrigerant flowing through the refrigerant refrigerant pipe 15 can be further cooled. As a result, the inside air can be further cooled in the freezing evaporator 14 of the showcase 2. When the outside air temperature is low, the cooling water exiting the gas cooler 12 is sent to the outgoing header 32 via the cooling water branch pipe 41 and exchanged heat with the air in the air-conditioned space 36 via the radiation panel 37. In addition, since the cooling water sent from the gas cooler 12 is warmed by heat exchange, the radiation panel 37 can perform efficient air conditioning using the exhaust heat of the cooling water. Thus, efficient cooling or heating can be performed in the refrigerator 4 or the air conditioner 6 by switching the circulation path of the cooling water according to the outside air temperature.

  FIG. 2 shows the results when the monthly power consumption in the refrigerator 4 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 4 is significantly reduced and the efficiency is increased.

  In the present embodiment, the cooling tower 21 is provided with the water exchanger 29 in the water tank, and the cooling water returned from the cooling water pipe 23 is heat-exchanged with the spraying water. The cooling water can be reliably prevented from freezing without providing the cooling water freeze prevention device. Note that the cooling tower 21 may be an open system in an area where freezing is not a concern and in which the quality of the cooling water can be controlled.

  Furthermore, in this embodiment, since the efficiency of the refrigerator 4 or the air conditioner 6 is improved by changing the circulation path of the cooling water, only the circulation pipe of the cooling water needs to be installed. Since the tonnage does not increase, large-capacity systems can be combined without being restricted by the High Pressure Gas Safety Law.

Next, a second embodiment of the present invention will be described with reference to FIG.
In the present embodiment, a cooling water heat exchanger 60 is provided in the middle of the cooling water pipe 23 on the upstream side of the gas cooler 12 to cool the return cold water branch pipe 42 branched from the air conditioning cold water pipe 35 of the chiller air conditioning circuit 30. The cooling water branch pipe 40 and the cooling water branch pipe 41 are connected to the outlet side of the cooling water heat exchanger 60 while being connected to the inlet side of the water heat exchanger 60. That is, in this embodiment, the cooling water circulating through the cooling water pipe 23 and the cooling water circulating through the air conditioning cold water pipe 35 do not cross each other, and only heat exchange is performed via the cooling water heat exchanger 60. It is comprised so that it may perform. The cooling water pipe 23 is provided with a cooling water three-way valve 62, and the cooling water three-way valve 62 is provided with a bypass pipe 63 connected to the outlet side of the cooling tower. Further, the return cold water branch pipe 42 is provided with a flow rate adjusting valve 48.

  Since the other configuration is the same as that of the first embodiment shown in FIG.

Next, the operation of this embodiment will be described.
Also in the present embodiment, as in the first embodiment, when the outside air temperature is high, such as in the summer, the controller 50 controls the opening / closing valve 46 to be opened and the opening / closing valve 47 to be closed. The pump 28 and the cooling water pump 22 are operated. Thereby, after the cooling water cooled by the cooling tower 21 is sent to the gas cooler 12 through the cooling water pipe 23 by the cooling water pump 22 and exchanges heat with the refrigerant flowing through the refrigerant refrigerant pipe 15 in the gas cooler 12. And returned to the cooling tower 21.

  On the other hand, the cooling water returning from the air-conditioning cold water pipe 35 of the chiller air-conditioning circuit 30 and flowing through the cold water branch pipe 42 is heat-exchanged with the cooling water flowing through the cooling water pipe 23 by the cooling water heat exchanger 60, and then the cooling water branch pipe 40. A part is returned to the chiller 31 together with the cold water heat-exchanged by the radiation panel 37, and a part is returned to the cold water branch pipe 42. Therefore, in this embodiment, the heat quantity of the cold water in the chiller air conditioning circuit 30 can be utilized by exchanging heat between the cooling water heat exchanged in the gas cooler 12 and the cold water in the chiller air conditioning circuit 30. Heat exchange can be performed efficiently, and the refrigerant flowing through the refrigeration refrigerant pipe 15 can be further cooled. As a result, the inside air can be further cooled in the freezing evaporator 14 of the showcase 2.

  Further, when the outside air temperature is low, such as in winter, the controller 50 controls the on-off valve 46 to be closed and the on-off valve 47 to be opened, and the cooling tower fan 26, the watering pump 28 and the cooling water pump 22 are also operated. Thereby, after the cooling water cooled by the cooling tower 21 is sent to the gas cooler 12 through the cooling water pipe 23 by the cooling water pump 22 and exchanges heat with the refrigerant flowing through the refrigerant refrigerant pipe 15 in the gas cooler 12. And returned to the cooling tower 21. In this case, when the outside air temperature is low, since the load on the gas cooler 12 is small, the refrigerant flowing through the refrigeration refrigerant pipe 15 can be sufficiently cooled.

  On the other hand, the water of about 23 ° C. returned from the chiller (heater) air conditioning circuit 30 and sent via the cold water branch pipe 42 is heat-exchanged by the cooling water heat exchanger 60 and is sent to the forward header 32 via the cooling water branch pipe 41. The heat is exchanged with the air in the air-conditioned space 36 via the radiation panel 37. Thereby, in the radiation panel 37, efficient air conditioning (heating) can be performed using the exhaust heat of cooling water. Thereafter, a part of the water exchanged by the radiation panel 37 is returned to the chiller 31 and a part of the water is returned and sent to the cold water branch pipe 42.

  As described above, also in the present embodiment, similarly to the first embodiment, the refrigerator 4 is switched by switching the circulation path of the cooling water heat-exchanged by the cooling water heat exchanger 60 according to the outside air temperature. Or in the air conditioning apparatus 6, efficient cooling or heating can be performed. In the present embodiment, the cooling tower 21 is provided with the water exchanger 29 in the water tank, and the cooling water returned from the cooling water pipe 23 is heat-exchanged with the spraying water. The cooling water can be reliably prevented from freezing without providing the cooling water freeze prevention device.

  Moreover, in this embodiment, since the efficiency of the refrigerator 4 or the air conditioner 6 is improved by changing the circulation path of the cooling water, only the circulation pipe of the cooling water needs to be installed, and legal refrigeration. Since the tonnage does not increase, large-capacity systems can be combined without being restricted by the High Pressure Gas Safety Law. Further, in the present embodiment, the cooling water heat exchanger 60 is used to exchange heat between the cooling water circulating through the cooling water pipe 23 and the cooling water circulating through each cooling water branch pipe. The cooling waters do not mix with each other. For this reason, for example, even when an antifreeze is used for the cooling water circulating through the cooling water pipe 23, efficient cooling or heating can be performed without problems.

  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 4 Refrigerator 6 Air conditioning apparatus 10 1st refrigeration cycle circuit 11 Refrigeration compressor 12 Gas cooler 13 Refrigeration expansion valve 14 Refrigeration evaporator 15 Refrigeration refrigerant piping 20 2nd refrigeration cycle circuit 21 Cooling tower 22 Cooling water pump 23 Cooling water piping 24 Heat exchanger 25 Cooling tower body 26 Cooling tower fan 27 Water tank 28 Sprinkling pump 29 Heat exchanger in water tank 30 Chiller air conditioning circuit (cooling or heating)
31 Chiller (chiller heater)
32 Outgoing header 33 Return header 34 Air conditioning pump 35 Air conditioning cold water piping (air conditioning hot water piping)
36 Air-conditioned space 37 Radiant panel (or fan coil)
38 Secondary pump 40 Cooling water branch piping (for chiller cooling operation)
41 Cooling water branch piping (for preheating operation when radiant heating or chiller heater is stopped)
42 Return cold water branch piping 45 Open / close valve 46 Open / close valve (for chiller cooling operation)
47 On-off valve (for preheating operation when radiant heating or chiller heater is stopped)
48 Flow control valve 50 Controller 51 Outside air temperature sensor 52 Pressure sensor 53 Cooling water temperature sensor 60 Cooling water heat exchanger 61 Cooling water two-way valve (cooling tower bypass control valve)
62 Cooling water three-way valve (cooling tower bypass control valve)

Claims (11)

A first refrigeration cycle circuit constituting a refrigerator equipped with a gas cooler, a second refrigeration cycle circuit that exchanges heat in the gas cooler with cooling water cooled by a cooling tower, and a chiller that performs air conditioning with cold water sent from the chiller An air conditioning circuit,
A return chilled water branch pipe branched from the air-conditioning chilled water pipe of the chiller air-conditioning circuit, and a cooling water branch pipe connected to the forward header or the return header of the chiller air-conditioning circuit,
While utilizing the heat of the water circulating in the return chilled water branch pipe and the cooling water branch pipe to the cooling water circulating pipe for cooling water in the second refrigeration cycle circuit, which utilizes a heating in the chiller air conditioning circuit And
A refrigeration system comprising control means for switching whether to send the cooling water of the cooling water branch pipe to the forward header or to the return header according to a chiller heater operation mode .   The return cold water branch pipe is connected to a cooling water pipe on the upstream side of the gas cooler in the second refrigeration cycle circuit, and the cooling water branch pipe branches from the downstream side of the gas cooler. The refrigeration system according to claim 1.   The return chilled water branch pipe and the cooling water branch pipe are connected to a cooling water heat exchanger connected to a cooling water pipe upstream of the gas cooler in the second refrigeration cycle circuit. The refrigeration system according to claim 1. The refrigeration system according to any one of claims 1 to 3, wherein the control unit switches the cooling water of the cooling water branch pipe to be sent to the return header during a chiller cooling operation. . 4. The control unit according to claim 1, wherein the control unit switches to send the cooling water of the cooling water branch pipe to the forward header when the large-sized chiller heater is stopped in the winter or when the radiant heating operation is performed. The refrigeration system according to one item . When the chiller air conditioning circuit stops the cooling water pump provided in the second refrigeration cycle circuit, the chiller air conditioning circuit supplies chilled water to the second refrigeration cycle circuit via the cooling water branch pipe and the return cold water branch pipe. The refrigeration system according to claim 1, further comprising an air-conditioning pump that circulates . The said control means sends the cooling water of the said 2nd freezing cycle circuit to the said going header at the time of a chiller heater stop, and performs heating preheating operation | movement, It is any one of Claims 1-6 characterized by the above-mentioned. Refrigeration system. A flow rate adjustment valve is provided in the cooling water branch pipe or the return cold water branch pipe, and the control means controls the opening of the flow rate adjustment valve so that the pressure of the gas cooler becomes a predetermined pressure. The refrigeration system according to any one of claims 4 to 7 . The cooling water branch pipe or the return cold water branch pipe is provided with a flow rate adjustment valve, and the control means is configured such that when the total power consumption of the refrigerator and the chiller air conditioning circuit exceeds a certain reference value, the chiller air conditioning circuit The refrigeration system according to any one of claims 1 to 8, wherein an opening degree of the flow rate adjustment valve is controlled so as to increase cooling water to be circulated from the refrigeration cycle to the second refrigeration cycle circuit . The water tank internal heat exchanger connected to the piping for cooling water from the said gas cooler was installed in the water tank for the dispersion | spreading water storage of the said cooling tower. The refrigeration system described. The refrigeration system according to any one of claims 1 to 10, wherein a valve that bypasses the cooling tower is provided in an inlet pipe or an outlet pipe of the cooling tower .

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