JPH06241591A - Composite refrigerant circuit facility - Google Patents

Abstract

PURPOSE:To improve total refrigerating efficiency of an entire facility by moving excessive cold heat of a refrigerant circuit having a high refrigerating efficiency to a refrigerant circuit having a low refrigerating efficiency. CONSTITUTION:Using this composite refrigerant circuit, excess refrigerating capacity of a cold storage side refrigerant circuit is stored as cold in cold accumulator of a heat storage tank 37 through a cold storage side heat storage evaporator 8 irrespective of consumption in a cold storage side evaporator 5 of a cold storage side refrigerant circuit having a high refrigerating efficiency. This cold is supplied to a refrigerating side refrigerant circuit having a low refrigerating efficiency through a refrigerating side subcooling heat exchanger 31 of the tank 37, and consumed by a refrigerating side evaporator 25 of a refrigerating side refrigerant circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a plurality of refrigerant circuits that cool different environments to be cooled in different cooling temperature ranges, that is, different refrigerant evaporation temperatures of an evaporator, and a heat storage tank for storing cold heat. The present invention relates to a composite type refrigerant circuit facility including:

[0002]

2. Description of the Related Art Conventionally, FIG. 9 shows the structure of a composite refrigerant circuit facility for cooling a refrigerator, a showcase, or the like, which is an environment to be cooled, such as a food processing center or a food store. In the figure, 1 is a refrigeration side compressor (first compressor), 2 is a refrigeration side condenser (first condenser), and 3 is a refrigeration side evaporator (first evaporator) indicated by 5. A solenoid valve for refrigerating on and off for refrigerating side, a refrigerating side expansion valve (an example of a first expansion device), and 6 a refrigerating side refrigerant pipe communicating these.
Further, 7 is a refrigerating-side heat storage tank that stores a heat storage agent such as water, 8 is a refrigerating-side heat storage evaporator (heat storage heat exchanger), and 9
Is a solenoid valve for heat storage on the refrigeration side for connecting and disconnecting the refrigerant to be supplied to the evaporator 8 for heat storage on the refrigeration side, 10 is an expansion valve for heat storage on the refrigeration side (an example of a throttle device for heat storage), and 11 is heat exchange for supercooling on the refrigeration side. Refrigerator, 12 and 13 are refrigeration side supercooling switching solenoid valve, 1 respectively
Reference numeral 4 denotes a refrigerant pipe for refrigerating-side supercooling, which is communicated with the refrigerant pipe 6 and bypasses the refrigerant to the refrigerating-side supercooling heat exchanger 11, and 15 is connected in parallel with the refrigerant pipe 6, and evaporates for refrigerating-side heat storage. The refrigerant piping for sending a refrigerant to container 8 is shown. 1 to 1
From the components denoted by reference numeral 5, for example, a showcase where the refrigerating side evaporator 5 is placed (an example of the first environment to be cooled, for example, a target temperature exceeding 0 ° C. is set)
A refrigerating-side refrigerant circuit (an example of a first refrigerant circuit) that cools the refrigerant is configured.

Reference numeral 21 is a refrigeration side compressor (second compressor), 22 is a refrigeration side condenser (second condenser), and 23 is 2.
A freezing side solenoid valve for connecting and disconnecting the refrigerant to be supplied to the freezing side evaporator (second evaporator) shown by 5, 24 is a freezing side expansion valve (an example of a second expansion device), and 26 communicates these. The refrigerant piping on the freezing side is shown. Further, 27 is a freezing side heat storage tank containing a heat storage agent such as water, 28 is a freezing side heat storage evaporator, and 29 is a freezing side heat storage for intermittently supplying a refrigerant to the freezing side heat storage evaporator 28. An electromagnetic valve, 30 is a freezing side heat storage expansion valve, 31 is a freezing side supercooling heat exchanger (cooling heat supply heat exchanger), 32 and 33 are freezing side supercooling switching electromagnetic valves, and 34 is a refrigerant pipe 26. Refrigerant piping for freezing side supercooling for communicating and bypassing the refrigerant to the heat exchanger 31 for subcooling on the freezing side, 35 is communicated in parallel to the refrigerant pipe 26 and sends the refrigerant to the evaporator 28 for heat storage on the freezing side. The refrigerant piping for is shown. From the components denoted by the reference numerals 21 to 35, for example, a freezer in which the freezing side evaporator 25 is placed (an example of a second environment to be cooled, which is set to a target temperature of 0 ° C. or less, for example) A refrigerating-side refrigerant circuit (an example of a second refrigerant circuit) for cooling the refrigerant is configured. Here, illustration of load-side devices such as showcases, refrigerators, and freezers in stores is omitted.

Next, the operation of the conventional equipment will be described with reference to FIG. First, in the refrigerating-side refrigerant circuit, high-temperature, high-pressure gas compressed by the refrigerating-side compressor 1 with each refrigerating-side supercooling switching solenoid valve 12 closed and the refrigerating-side supercooling switching solenoid valve 13 opened. Refrigerant is cooled in the refrigerator side condenser 2.
After being liquefied and decompressed by the refrigeration expansion valve 4 through the refrigeration solenoid valve 3, it flows into the refrigeration evaporator 5 to evaporate and absorb heat, cool the showcase and refrigerator, and return to the refrigeration compressor 1. To do. The same cycle is repeated thereafter. When the refrigerating capacity required to bring the environment to be cooled to the preset target temperature (this refrigerating capacity is referred to as "load") increases, the refrigerating-side subcooling switching solenoid valve 13 is closed to close each refrigerating room. By opening the side subcooling switching solenoid valve 12, the refrigerant from the refrigeration side condenser 2 is guided to the refrigeration side subcooling heat exchanger 11, and the cold heat previously stored in the refrigeration side heat storage tank 7 is taken out to show. Use for cooling the case. The refrigeration side solenoid valve 3 is opened / closed in accordance with a load state obtained based on an output result of a temperature controller (not shown) attached to a showcase or the like, and a refrigerant to be introduced into the refrigeration side evaporator 5. Control the liquid supply. On the other hand, regarding the operation of the refrigeration side refrigerant circuit shown from 21 to 35, the evaporation temperature of the refrigerant in the freezing side evaporator 25 is set lower than the evaporation temperature in the refrigeration side evaporator 5 of the refrigeration side refrigerant circuit. Since the other components are the same as those of the refrigeration side refrigerant circuit, description thereof will be omitted.

[0005]

The refrigeration side refrigerant circuit, that is, the refrigerant circuit in which the evaporation temperature of the refrigerant in the evaporator is low, is generally higher than that in the refrigeration side refrigerant circuit having a high evaporation temperature.
It is said that the refrigeration efficiency is low. And, as mentioned above,
In the conventional composite refrigerant circuit facility, a refrigeration side refrigerant circuit and a freezing side refrigerant circuit are separately and separately configured according to a target evaporation temperature. Therefore, there is a difference in refrigerating efficiency between the refrigerant circuits, and it cannot be said that the overall refrigerating efficiency of the entire equipment is good.

Further, since the cold heat transfer between the heat storage evaporator and the supercooling heat exchanger in each refrigerant circuit is entrusted to the natural convection of the heat storage agent, the cold heat transfer efficiency is not good.

Further, during cold storage operation, excess cold heat may be stored at the same time during cooling of the environment to be cooled, but when the heat exchange capacity of the heat storage evaporator is too large,
Since the cold heat is stored more than necessary, the cooling capacity for the environment to be cooled is drastically reduced. As a result, the temperature of, for example, the object to be cooled stored in the showcase or the refrigerator may rise.

Further, when the heat exchange capacity of the supercooling heat exchanger exceeds the capacity control range of the expansion valve, the gas-liquid mixed refrigerant is directly returned to the suction side of the compressor, which causes a mechanical adverse effect. However, there is a problem in that the reliability of the equipment is impaired.

Since the heat exchanger for cold storage and the heat exchanger for supercooling are separately and independently provided, the initial manufacturing cost of these heat exchangers is large, and there is room for improvement in terms of investment effect. was there.

Further, even if the refrigerant has the same evaporation temperature in the evaporator, if a plurality of systems of refrigerant circuits are provided depending on the type of environment to be cooled, the load condition of the environment to be cooled is different for each system. In many cases, it was not uniform, and there was room for improvement in the overall operating efficiency of all compressors due to variations in the operating rate of each compressor in each system.

The present invention has been made in order to solve the problems of the prior art as described above, and by moving the surplus cold heat of the refrigerant circuit having high refrigeration efficiency to the refrigerant circuit having low refrigeration efficiency, the entire equipment is reduced. It is an object of the present invention to provide a composite refrigerant circuit facility capable of improving the overall refrigeration efficiency as described above.

[0012] It is another object of the present invention to provide a composite refrigerant circuit facility which is excellent in cold heat transfer efficiency of surplus cold heat between a plurality of refrigerant circuits.

Further, in the case of storing excess cold heat at the same time during cooling of the environment to be cooled during the cold storage operation, the cooling capacity for the showcase, refrigerator, etc. is reduced by appropriately controlling the amount of cold storage. It is an object of the present invention to provide a composite refrigerant circuit facility capable of preventing the temperature of the object to be cooled stored in the container from rising.

It is another object of the present invention to provide a composite refrigerant circuit equipment which does not impair the reliability of the equipment such that the gas-liquid mixed refrigerant is returned to the suction side of the compressor as it is to cause a mechanical adverse effect. To do.

Another object of the present invention is to provide a composite refrigerant circuit facility capable of reducing the manufacturing cost of initials for the heat exchanger for cold storage and the heat exchanger for supercooling.

[0016]

In order to achieve the above object, the composite refrigerant circuit equipment according to the present invention is provided with the following technical means. That is, in the composite refrigerant circuit facility according to the invention of claim 1, the first compressor, the first condenser, the first expansion device, and the first evaporator for cooling the first cooled environment are sequentially arranged. Heat storage in which a first refrigerant circuit connected in an annular shape and a first storage device and a first evaporator are connected in parallel to the first storage device in parallel with a heat storage expansion device and a heat storage heat exchanger Heat storage agent for accommodating cold heat corresponding to the difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment via the heat exchanger for heat storage and the heat exchanger for heat storage The tank, the second compressor, the second condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment are sequentially provided. A second refrigerant circuit connected in an annular shape and a heat storage device connected between the second condenser and the second evaporator of the second refrigerant circuit. In which the made the cold heat from the heat storage agent and a first of the cold supply circuit having a second cold supply heat exchanger for supplying the refrigerant circuit.

According to another aspect of the present invention, there is provided a combined refrigerant circuit facility comprising a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. A first refrigerant circuit which is sequentially connected in an annular shape, and a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the first refrigerant circuit in parallel with the first expansion device and the first evaporator. And a heat storage agent that stores cold heat corresponding to the difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment via the heat storing heat exchanger. Heat storage tank, second compressor, second condenser, second expansion device, and first
Second refrigerant circuit in which a second evaporator for cooling the second cooled environment, which has a temperature lower than that of the second cooled environment, is sequentially connected in an annular shape, and a second condenser of the second refrigerant circuit And a second evaporator, and a first cold heat supply circuit having a heat exchanger for cold heat supply for supplying cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit; A first refrigerating capacity detection device that detects a physical quantity corresponding to the refrigerating capacity given to the environment, and a first refrigerating capacity based on a difference between the maximum refrigerating capacity of the first refrigerant circuit and the refrigerating capacity corresponding to the detected physical quantity. And a first refrigerant flow rate control device that controls the flow rate of the refrigerant from the refrigerant circuit to the heat storage heat exchanger.

According to another aspect of the present invention, there is provided a combined refrigerant circuit facility including a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. A first refrigerant circuit which is sequentially connected in an annular shape, and a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the first refrigerant circuit in parallel with the first expansion device and the first evaporator. And a heat storage agent that stores cold heat corresponding to the difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment via the heat storing heat exchanger. Heat storage tank, second compressor, second condenser, second expansion device, and first
Second refrigerant circuit in which a second evaporator for cooling the second cooled environment, which has a temperature lower than that of the second cooled environment, is sequentially connected in an annular shape, and a second condenser of the second refrigerant circuit And a second evaporator, a first cold heat supply circuit having a cold heat supply heat exchanger for supplying cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit, and a second cooled target A second refrigerating capacity detecting device for detecting a physical quantity corresponding to the refrigerating capacity given to the environment, and a second refrigerating capacity based on a difference between the maximum refrigerating capacity of the second refrigerant circuit and the refrigerating capacity corresponding to the detected physical quantity. For controlling the flow rate of the refrigerant from the refrigerant circuit to the heat exchanger for supplying cold heat, the second
And a refrigerant flow rate control device.

According to another aspect of the present invention, there is provided a combined refrigerant circuit facility comprising a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first cooled environment. A first refrigerant circuit that is sequentially connected in an annular shape, and a first expansion device and a first evaporator that are connected in parallel to a heat storage expansion device and a heat storage heat exchanger in parallel to the first refrigerant circuit. A heat storage refrigerant circuit and a heat storage agent for storing cold heat corresponding to the difference between the maximum refrigeration capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment via the heat storage heat exchanger are stored. A heat storage tank, a second compressor, a second condenser, a second expansion device, and a second evaporator for cooling the second cooled environment whose temperature is lower than that of the first cooled environment. A second refrigerant circuit that is sequentially connected in an annular shape, and is connected between the second condenser and the second evaporator of the second refrigerant circuit A first cold heat supply circuit having a cold heat supply heat exchanger for supplying cold heat from the heat storage agent in the tank to the second refrigerant circuit, and heat storage provided between the heat storage heat exchanger and the heat storage tank. A first heat storage agent circulation device that circulates the heat storage agent from the tank to give the refrigerant from the refrigerant of the heat storage heat exchanger to the heat storage agent, and is provided between the cold heat supply heat exchanger and the heat storage tank And a second heat storage agent circulating device which circulates the heat storage agent from the heat storage tank to give cold heat to the refrigerant of the heat exchanger for supplying cold heat.

According to a fifth aspect of the present invention, there is provided a combined refrigerant circuit facility comprising a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. A first refrigerant circuit that is sequentially connected in an annular shape, and a first expansion device and a first evaporator that are connected in parallel to a heat storage expansion device and a heat storage heat exchanger in parallel to the first refrigerant circuit. A heat storage refrigerant circuit and a heat storage agent for storing cold heat corresponding to the difference between the maximum refrigeration capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment via the heat storage heat exchanger are stored. A heat storage tank, a second compressor, a second condenser, a second expansion device, and a second evaporator for cooling the second cooled environment whose temperature is lower than that of the first cooled environment. A second refrigerant circuit that is sequentially connected in an annular shape, and is connected between the second condenser and the second evaporator of the second refrigerant circuit A first cold heat supply circuit having a cold heat supply heat exchanger for supplying cold heat from the heat storage agent in the tank to the second refrigerant circuit, and heat storage provided between the heat storage heat exchanger and the heat storage tank. A first heat storage agent circulating device that circulates the heat storage agent from the tank to give cold heat from the refrigerant of the heat storage heat exchanger to the heat storage agent, and is provided between the cold heat supply heat exchanger and the heat storage tank A second heat storage agent circulation device that circulates the heat storage agent from the stored heat storage tank to apply cold heat to the refrigerant of the cold heat supply heat exchanger;
Difference between the first refrigerating capacity detection device for detecting a physical quantity corresponding to the refrigerating capacity given to the first cooled environment and the maximum refrigerating capacity of the first refrigerant circuit and the refrigerating capacity corresponding to the detected physical quantity. And a first heat storage agent circulation amount control device for controlling the circulation amount of the heat storage agent by the first heat storage agent circulation device based on the above.

According to a sixth aspect of the present invention, there is provided a combined refrigerant circuit facility comprising a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. A first refrigerant circuit which is sequentially connected in an annular shape, and a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the first refrigerant circuit in parallel with the first expansion device and the first evaporator. And a heat storage agent that stores cold heat corresponding to the difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment via the heat storing heat exchanger. Heat storage tank, second compressor, second condenser, second expansion device, and first
Second refrigerant circuit in which a second evaporator for cooling the second cooled environment, which has a temperature lower than that of the second cooled environment, is sequentially connected in an annular shape, and a second condenser of the second refrigerant circuit And a second evaporator, a first cold heat supply circuit having a cold heat supply heat exchanger that supplies cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit, and a heat storage heat exchanger And a heat storage tank, the first heat storage agent circulating device for circulating the heat storage agent from the heat storage tank to circulate the cold heat from the refrigerant of the heat storage heat exchanger to the heat storage agent, and the heat for supplying cold heat A second heat storage agent circulating device provided between the exchanger and the heat storage tank to circulate the heat storage agent from the heat storage tank to apply cold heat to the refrigerant of the heat exchanger for supplying cold heat, and a second cooled object. A second refrigerating capacity detection device for detecting a physical quantity corresponding to the refrigerating capacity given to the environment, and maximum refrigeration of the second refrigerant circuit. And a second heat storage agent circulation amount control device for controlling the circulation amount of the heat storage agent by the second heat storage agent circulation device based on the difference between the force and the refrigerating capacity corresponding to the detected physical quantity. is there.

According to a seventh aspect of the present invention, there is provided a combined refrigerant circuit facility including a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. A first refrigerant circuit that is sequentially connected in an annular shape, and a first expansion device and a first evaporator that are connected in parallel to a heat storage expansion device and a heat storage heat exchanger in parallel to the first refrigerant circuit. A heat storage refrigerant circuit and a heat storage agent for storing cold heat corresponding to the difference between the maximum refrigeration capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment via the heat storage heat exchanger are stored. A heat storage tank, a second compressor, a second condenser, a second expansion device, and a second evaporator for cooling the second cooled environment whose temperature is lower than that of the first cooled environment. A second refrigerant circuit that is sequentially connected in an annular shape, and is connected between the second condenser and the second evaporator of the second refrigerant circuit A first cold heat supply circuit having a cold heat supply heat exchanger for supplying cold heat from the heat storage agent of the tank to the second refrigerant circuit; a first condenser and a first expansion device of the first refrigerant circuit; And a circuit opening / closing device that is connected in series between the first and second passages and has a flow path that can be opened and closed. The refrigerant from the first condenser is diverted to the heat storage heat exchanger to cool the heat storage agent in the heat storage tank. Second cold heat supply circuit for supplying to the refrigerant circuit, a heat storage amount detection device for detecting the heat storage amount of the heat storage agent in the heat storage tank, and a circuit opening / closing device for opening and closing the refrigerant based on the detected heat storage amount of the heat storage agent. And a refrigerant flow path control device for switching the flow path of (1) to the heat storage refrigerant circuit and the second cold heat supply circuit.

According to the eighth aspect of the present invention, there is provided a combined refrigerant circuit facility including a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. A first refrigerant circuit that is sequentially connected in an annular shape, and a first expansion device and a first evaporator that are connected in parallel to a heat storage expansion device and a heat storage heat exchanger in parallel to the first refrigerant circuit. A heat storage refrigerant circuit and a heat storage agent for storing cold heat corresponding to the difference between the maximum refrigeration capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment via the heat storage heat exchanger are stored. A heat storage tank, a second compressor, a second condenser, a second expansion device, and a second evaporator for cooling the second cooled environment whose temperature is lower than that of the first cooled environment. In a combined refrigerant circuit facility including a second refrigerant circuit that is sequentially connected in a ring shape, the second condenser is connected to the heat storage agent. It is characterized in that the cold provided to allow the heat storage tank fed to the second refrigerant circuit.

[0024]

In the composite type refrigerant circuit equipment according to the present invention, between the plurality of refrigerant circuits for respectively cooling the plurality of environments to be cooled having different cooling temperatures, the first refrigerant circuit on the high cooling temperature side having high refrigeration efficiency is provided. The surplus cold heat can be stored in the heat storage agent of the heat storage tank via the heat storage heat exchanger, and transferred to the second refrigerant circuit on the low cooling temperature side with low refrigeration efficiency via the heat storage tank. As a result, the refrigeration efficiency of the entire facility can be improved.

In addition to being able to move the surplus cold heat from the first refrigerant circuit to the second refrigerant circuit through the heat storage tank, the surplus cold heat amount of the first refrigerant circuit (of the first compressor The amount of refrigerant flowing from the first refrigerant circuit to the heat storage heat exchanger can be controlled in accordance with the physical quantity such as the inlet pressure or the environment temperature to be cooled. Thereby, the cold storage amount of the surplus cold heat can be controlled.

On the contrary, in accordance with the refrigerating capacity (corresponding to the physical quantity such as the inlet pressure of the second compressor and the environment temperature to be cooled) of the second refrigerant circuit, the heat exchange for heat storage from the second refrigerant circuit. The amount of refrigerant flowing into the container can be controlled. This makes it possible to control the amount of cold heat received from the heat storage tank.

Further, by the first heat storage agent circulation device and the second heat storage agent circulation device, respectively toward the heat storage heat exchanger and the cold heat supply heat exchanger for transferring cold heat to and from the heat storage tank. The heat storage agent from the heat storage tank can be forcedly circulated. Therefore, the cold heat transfer efficiency can be improved.

The first heat storage agent circulation amount control device controls the first heat storage agent circulation device according to the surplus cold heat amount in the first refrigerant circuit corresponding to the physical quantity from the first refrigeration capacity detection device. Controls the circulation amount of the heat storage agent. Therefore, it is possible to control the heat storage amount of the surplus cold heat from the first refrigerant circuit.

On the contrary, in accordance with the insufficient refrigerating capacity in the second refrigerant circuit corresponding to the physical quantity from the second refrigerating capacity detecting device, the second heat storing agent circulating amount control device causes the second heat storing agent circulating device to operate. To control the circulation amount of the heat storage agent. This makes it possible to control the amount of supply of the refrigeration capacity that is insufficient in the second refrigerant circuit.

The heat storage amount of the heat storage agent is detected by the heat storage amount detecting device. According to the detected heat storage amount, the refrigerant flow path control device switches the refrigerant flow path to
One heat storage heat exchanger connected to the refrigerant circuit is used as an evaporator or a condenser. Therefore, the manufacturing cost of the initials for the heat exchanger can be reduced.

Further, since the second condenser is provided in the heat storage tank so that the cold heat from the heat storage agent can be supplied to the second refrigerant circuit, the high temperature refrigerant from the second compressor is second condensed. It is directly condensed by the cold heat of the heat storage agent from the heat storage tank and further supercooled. Thereby, the cold heat of the heat storage agent can be efficiently used. In addition, the manufacturing cost of the initials for the heat exchanger can be reduced.

[0032]

【Example】

Example 1. 1 is a block diagram showing a composite type refrigerant circuit facility according to a first embodiment of the present invention.
5, 21 to 26, and 31 are the same as the above-mentioned conventional equipment. Further, 37 is a heat storage tank containing a heat storage agent such as water, 34a is a heat exchanger 31 for freezing side subcooling of a freezing side refrigerant circuit provided in the heat storage tank 37, and a freezing side condenser 22 and a freezing side solenoid valve. 23 is a refrigerant pipe that communicates in series with a refrigerant pipe line 26 between the refrigerant pipe 23 and the pipe 23. That is, the configuration including the freezing-side cooling heat exchanger 31 and the refrigerant pipe 34a is an example of the first cold heat supply circuit. In particular, in this composite refrigerant circuit facility, the refrigerating-side heat storage evaporator 8 of the refrigerating-side refrigerant circuit is also capable of transferring heat to the freezing-side subcooling heat exchanger 31 via the heat storage agent so that the heat storage tank 37 can be transferred. It is deployed inside.

Next, the operation of the composite type refrigerant circuit equipment in this embodiment will be described. Here, for example, in the refrigeration side refrigerant circuit, the refrigeration side compressor 1 and the refrigeration side condenser 2
Is designed to cover a preset maximum load (an example of maximum refrigerating capacity) for the environment to be cooled (showcase, etc.), so if the load given to the showcase, etc. decreases, At that time, a surplus refrigerating capacity is generated as a difference from the load applied to the showcase or the like. According to this combined refrigerant circuit facility, an amount of the refrigerant liquid corresponding to the surplus refrigerating capacity is supplied to the refrigeration side heat storage evaporator 8 through the refrigeration side heat storage electromagnetic valve 9 and the refrigeration side heat storage expansion valve 10. As a result, the excess freezing capacity is stored as cold heat in the heat storage agent in the heat storage tank 37. On the other hand, in the refrigeration side refrigerant circuit, the high-temperature, high-pressure gas refrigerant compressed by the refrigeration side compressor 21 is liquefied by the refrigeration side condenser 22, and then the heat storage tank 37 is passed through the refrigeration side supercooling refrigerant pipe 34a. It is supplied to the heat exchanger 31 for subcooling on the freezing side and is cooled via the heat storage agent. As a result, the refrigerant cooled to a lower temperature is supplied to the freezing side evaporator 25 from the freezing side electromagnetic valve 23 and the like. In this way, as the extra refrigeration capacity, the cold heat stored in the heat storage agent of the heat storage tank 37 from the refrigeration side refrigerant circuit is consumed in the freezing side refrigerant circuit via the shared heat storage agent of the heat storage tank 37. Therefore, while the evaporation temperature of the refrigerant in the refrigerating side evaporator 5 is high, that is, the surplus cold heat is stored in the refrigerating side refrigerant circuit having high operation efficiency, this cold heat is stored in the refrigerating side evaporator 25. Low evaporation temperature,
That is, since it is used in the refrigeration side refrigerant circuit having low operating efficiency, it is possible to improve the overall refrigeration efficiency of the entire facility including the refrigeration side refrigerant circuit and the refrigeration side refrigerant circuit. Further, since only one heat storage tank is required, the structure related to the heat storage tank can be simplified.

Example 2. FIG. 2 is a block diagram showing a composite refrigerant circuit facility according to a second embodiment of the present invention, the configuration of which is almost the same as that of the first embodiment, except that the following components are provided. . In the refrigeration side refrigerant circuit, 42 is a pressure detector (first pressure detecting device) connected to the suction side refrigerant pipe of the refrigeration side compressor 1 for detecting the suction pressure of the refrigerant gas.
Of the refrigerating capacity detection device), 43 is a control device that performs control calculation based on the pressure detection value detected by the pressure detector 42,
Reference numeral 44 denotes a flow rate adjusting valve provided in the refrigerant pipe 15 for adjusting the flow rate of the refrigerant flowing into the refrigerating side heat storage evaporator 8 based on the calculation result of the control apparatus 43 (comprising the flow rate adjusting valve 44 and the control apparatus 43. The configuration is an example of a first refrigerant flow rate control device). In the refrigeration side refrigerant circuit, 26
a is a refrigerant pipe for circulating the refrigerant from the refrigeration side condenser 22 to bypass the refrigeration side subcooling heat exchanger 31, and 45 is a refrigerant gas connected to the suction side refrigerant pipe of the refrigeration side compressor 21 A pressure detector for detecting suction pressure (an example of a second refrigerating capacity detection device), 46 is a control device for performing control calculation based on the pressure detection value detected by the pressure detector 45, and 57 is provided in the refrigerant pipe 26a. A flow rate adjusting valve (the flow rate adjusting valve 57, the control unit 46, and the refrigerant pipe 26a are included to adjust the flow rate of the refrigerant flowing into the freezing-side subcooling heat exchanger 31 based on the calculation result of the control unit 46. Is an example of a second refrigerant flow rate control device).

Next, the operation of the composite refrigerant circuit equipment according to the second embodiment will be described. The basic refrigeration cycle operation of each refrigerant circuit in this composite refrigerant circuit facility is the same as that of the first embodiment. By the way, if the load on the environment to be cooled, that is, the refrigerating capacity applied to the environment to be cooled changes, the physical quantity (pressure on the suction side of the compressor, temperature of the environment to be cooled, etc.) corresponding thereto also changes. For example, when the load on the refrigeration side refrigerant circuit decreases, the surplus refrigerating capacity increases. Then, the pressure on the suction side of the refrigeration side compressor 1 changes in accordance with the surplus refrigerating capacity. The pressure at this time is detected by the pressure detector 42 and output to the control device 43 as a pressure detection value. Therefore, the control device 43 calculates the opening degree of the flow rate adjusting valve 44 based on the pressure detection value and outputs it to the flow rate adjusting valve 44 to increase the opening degree. As a result, an amount of refrigerant liquid equivalent to this surplus refrigerating capacity,
The cold heat of the refrigerant liquid is supplied to the heat exchanger 8 for cold storage on the cold storage side through the solenoid valve 9 for cold storage heat storage and the expansion valve 10 for cold storage heat storage, and the cold heat of the refrigerant liquid is stored in the heat storage agent of the heat storage tank 37. As described above, when the surplus capacity is large, the cold storage capacity is increased by increasing the opening degree of the flow rate adjusting valve 44 and increasing the amount of the refrigerant flowing into the refrigeration-side cold storage heat exchanger 8. vice versa,
For example, when the load on the refrigerating side refrigerant circuit increases and the surplus refrigerating capacity decreases, the opening degree of the flow rate adjusting valve 44 is reduced to reduce the amount of refrigerant flowing into the refrigerating side cold storage heat exchanger 8. As a result, the cold storage capacity can be reduced.
Thus, according to the composite refrigerant circuit facility of the second embodiment,
According to the surplus refrigerating capacity, it is possible to efficiently store the amount of cold heat corresponding to the surplus refrigerating capacity. Therefore, since the cold storage evaporator 8 does not excessively store the cold, the refrigeration capacity of the refrigeration evaporator 5 placed in the showcase or the like is not insufficient, and the cold storage evaporator 8 is stored in the showcase or the like. It does not raise the temperature of the refrigerated food or the like that has been stored to an inconvenient temperature.

On the other hand, also in the refrigeration side refrigerant circuit, it is possible to perform efficient control as in the refrigeration side refrigerant circuit. For example, when the load in the refrigerating-side refrigerant circuit increases and the required refrigerating capacity increases, the control device 46 calculates based on the pressure detection value from the pressure detector 45.
According to the output opening command, the opening of the flow rate adjusting valve 57 is reduced and the flow rate of the refrigerant to the freezing side subcooling heat exchanger 31 is increased. As a result, a large amount of cold heat of the heat storage tank 37 is used in the refrigeration side refrigerant circuit. On the contrary, when the load is reduced and the required refrigerating capacity is reduced, the opening degree of the flow rate adjusting valve 57 is increased and the refrigerant amount bypassing the refrigeration side subcooling heat exchanger 31 is increased. As described above, according to the composite refrigerant circuit facility of the second embodiment, according to the refrigerating capacity required in the refrigerating-side refrigerant circuit, the amount of cold heat corresponding to the necessary refrigerating capacity can be efficiently extracted from the heat storage agent. You can In this composite refrigerant circuit facility, each refrigerant circuit may be individually controlled, or both refrigerant circuits may be simultaneously controlled depending on the amount of heat stored in the heat storage tank 37.

Example 3. FIG. 3 is a block diagram showing a composite refrigerant circuit facility according to a third embodiment of the present invention, which has almost the same configuration as that of the first and second embodiments, but has the following components. Different. In the refrigerating-side refrigerant circuit, 8a is provided outside the heat storage tank 37 to cool the refrigerating-side refrigerant circuit to store excess cold heat, and 43a indicates a pressure detection value detected by the pressure detector 42. A control device for performing a control calculation based on the base, 47 is a water pipe annularly connected to the heat storage tank 37 so as to pass through the refrigeration side heat storage evaporator 8a, and 48 is a water pipe 47 provided in the water pipe 47 to store water in the heat storage tank 37. A pump that circulates in the refrigerating side heat storage evaporator 8a (an example of a first heat storage agent circulating device having the pump 48 and the water pipe 47), 49 is a pump 48 based on the calculation result of the control device 43a. Is an inverter for controlling the number of rotations of (1) (a configuration including the inverter 49 and the control device 43a is an example of a first heat storage agent circulation amount control device). Further, in the freezing side refrigerant circuit, 31a is a heat exchanger for freezing side subcooling that is provided outside the heat storage tank 37 to take out cold heat to the freezing side refrigerant circuit, and 46b is a pressure detection value detected by the pressure detector 45. A control device for performing control calculation based on
Is a water pipe annularly connected to the heat storage tank 37 via the freezing side supercooling heat exchanger 31a, and 51 is a water pipe 50 provided in the water pipe 50 to cool the water in the heat storage tank 37 into a freezing side supercooling heat exchanger. Three
1a is a pump (a configuration including the pump 51 and the water pipe 50 is an example of a second heat storage agent circulation device), and 52 is a pump 5 based on the calculation result of the control device 46b.
An inverter for controlling the number of revolutions of 1 (a configuration including the inverter 52 and the control device 46b is an example of a second heat storage agent circulation amount control device). The basic refrigeration cycle operation of each refrigerant circuit in this composite refrigerant circuit facility is the same as in the first and second embodiments.

Next, the operation of the composite refrigerant circuit equipment according to the third embodiment will be described. First, in the refrigerating-side refrigerant circuit, for example, when the load is reduced and surplus refrigerating capacity is generated, the refrigerant corresponding to the surplus refrigerating capacity passes through the refrigerating-side heat storage electromagnetic valve 9 and the refrigerating-side heat storage expansion valve 10 to the refrigerating side. It is supplied to the heat storage evaporator 8a. The refrigerant exchanges heat with the water flowing through the water pipe 47 in the refrigerating-side heat storage evaporator 8a by the pump 48, and is stored in the heat storage tank 37. Then, the pressure on the suction side of the refrigeration side compressor 1, which changes corresponding to the surplus refrigeration capacity, is detected by the pressure detector 42.
Therefore, when the surplus refrigerating capacity is large, the control device 43a
Controls the inverter 49 so as to increase the rotation speed of the pump 48 based on the detected pressure value. As a result, the cold storage capacity is increased by increasing the amount of water flowing through the refrigerating-side heat storage evaporator 8a. On the contrary, when the surplus refrigerating capacity is small, the rotation speed of the pump 48 is reduced to reduce the amount of water flowing through the refrigerating side heat storage evaporator 8a, thereby reducing the cold storage capacity. In this way, by controlling the circulation amount of water to the refrigeration side heat storage evaporator 8a according to the surplus refrigerating capacity, it is possible to efficiently store the amount of cold heat corresponding to the surplus refrigerating capacity. That is, Example 2
As in the case of the above, since the cold storage side heat storage evaporator 8a is not excessively stored, the shortage of the refrigerating capacity given to the refrigeration side evaporator 5 placed in a showcase or the like is not caused and the show There is no need to raise the refrigerated food or the like housed in the case or the like to an inconvenient temperature.

On the other hand, in the refrigerating-side refrigerant circuit, for example, when the load in the refrigerating-side refrigerant circuit increases and the required refrigerating capacity increases, the control device 46b based on the pressure detection value from the pressure detector 45. The inverter 52 is controlled so as to increase the rotation speed of the pump 51 based on the calculation result of Thereby, the heat exchanger 31a for cold storage on the freezing side
By increasing the amount of water flowing through, the amount of cold heat taken out to the refrigeration side refrigerant circuit is increased. On the contrary, when the required refrigerating capacity becomes small, the rotation speed of the pump 51 is reduced to reduce the amount of water flowing through the refrigerating-side cold storage heat exchanger 31a, thereby reducing the amount of cold heat taken out. It In this way, by controlling the circulation amount of water to the freezing-side heat storage evaporator 31a according to the refrigerating capacity required in the refrigerating-side refrigerant circuit, the amount of cold heat equivalent to the required refrigerating capacity is efficiently transferred from the water. It can be taken out well and given to the refrigeration side refrigerant circuit. In this composite type refrigerant circuit facility, as in the case of the second embodiment, each refrigerant circuit may be individually controlled, or both refrigerant circuits may be controlled depending on the amount of heat stored in the heat storage tank 37. It is also possible to control them at the same time.

Example 4. Fourth Embodiment FIG. 4 is a configuration diagram showing a main part of a refrigeration side refrigerant circuit in a composite refrigerant circuit facility according to a fourth embodiment of the present invention. In the figure, this composite refrigerant circuit facility has a plurality of refrigeration side refrigerant circuits, and the basic refrigeration cycle circuit and freezing side refrigerant circuit of these refrigeration side refrigerant circuits are not shown. However, these are almost the same as those of the third embodiment, for example. In the complex refrigerant circuit facility according to the fourth embodiment, a plurality of refrigerating-side heat storage evaporators 8 a and a refrigerating-side supercooling heat exchanger 11 a are provided outside the heat storage tank 37. And
Each refrigerating-side heat storage evaporator 8a is connected in parallel via a refrigerant pipe 15 to the refrigerant pipe 6 (see FIG. 3) of the refrigerating-side refrigerant circuit of each system. In addition, each refrigeration-side supercooling heat exchanger 11 a also includes the refrigerant pipes 6 of each system via the refrigerant pipes 14.
(Refer to FIG. 9; in this case, the required refrigeration side subcooling switching solenoid valves 12 and 13 are also not shown). Further, each refrigerating-side heat storage evaporator 8a, each refrigerating-side supercooling heat exchanger 11a, and the heat storage tank 37 are connected in parallel via a water pipe 47a in a circulating manner. 1
Reference numeral 2a is a refrigeration side subcooling switching solenoid valve for intermittently controlling the supply of the refrigerant to each refrigeration side subcooling heat exchanger 11a.

Next, the operation of the composite refrigerant circuit equipment according to the fourth embodiment will be described. For example, when the load decreases in the refrigeration side refrigerant circuit of a certain system, the refrigerant liquid corresponding to the excess refrigerating capacity passes through the refrigeration side heat storage electromagnetic valve 9 and the refrigeration side heat storage expansion valve 10 of the system and evaporates for the refrigeration side heat storage. Is supplied to the container 8a. This refrigerant is heat-exchanged with the water flowing through the water pipe 47a in each heat exchanger 8a for heat storage on the refrigeration side by the pump 48, whereby the cold heat of the refrigerant is stored in the heat storage tank 37.
Is stored in cold. On the contrary, for example, when the load of a certain system increases and the refrigerating capacity becomes insufficient, the refrigeration-side supercooling switching solenoid valve 12a of the system is operated so that the high-temperature and high-pressure refrigerant is used for the refrigeration-side supercooling. It is supplied to the refrigeration-side supercooling heat exchanger 11a through the refrigerant pipe 14. Then, this refrigerant is cooled by exchanging heat with water flowing through the water pipe 47a in the refrigeration side subcooling heat exchanger 11a and the refrigeration side heat storage evaporator 8a of the respective systems by driving the pump 48. As a result, the cold heat stored in the water is taken out through the refrigeration-side supercooling heat exchanger 11a. In this case, even if there are systems with excess refrigeration capacity and systems with insufficient refrigeration capacity, the excess or deficiency of the refrigeration capacity in the refrigeration side refrigerant circuit of each system is due to the heat exchange for refrigeration side subcooling of each system. Water pipe 4 common to the cooler 11a and the refrigerating side heat storage evaporator 8a
Leveling is achieved by exchanging cold heat through water flowing through 7a. That is, the variation in the operating rate of the compressor for each system is also leveled. Therefore, it is possible to improve the refrigeration efficiency of the entire combined-type refrigerant circuit facility for refrigerating the refrigeration side refrigerant circuits of a plurality of systems. In addition, in the fourth embodiment, an example in which a plurality of refrigeration side refrigerant circuits are provided is shown, but it goes without saying that the invention can also be applied to a case where a plurality of systems refrigeration side refrigerant circuits are provided. Further, the invention can be applied to a system in which a plurality of refrigerating side refrigerant circuits and a plurality of refrigerating side circuits are provided. In this case, the water pipe connected to the heat storage tank 37 is connected to the refrigerating side (corresponding to the water pipe 47a) and the freezing side. By sharing with the other side, the efficiency of the entire equipment can be improved.

Example 5. 5 is a configuration diagram showing a refrigeration side refrigerant circuit in a composite type refrigerant circuit facility according to Embodiment 5 of the present invention. The same components as those of the embodiments described above are designated by the same reference numerals and the description thereof will be omitted. In the figure, 8b is a refrigeration side heat storage evaporator for storing excess cold heat in the refrigeration side refrigerant circuit in the heat storage tank 37. In particular, this refrigerating-side heat storage evaporator 8b contains a part of a plurality (here, three rows) of refrigerant pipes 15 connected in parallel to the refrigerant pipes 6 of the refrigerating-side refrigerant circuit. Further, a water pipe 47b which is arranged in the vicinity of the refrigerant pipe 15 so as to be capable of heat exchange is connected to the heat storage tank 37 in a circulating manner. Further, 43b is a control device for performing opening and closing control of the refrigeration side heat storage electromagnetic valves 9 provided in each refrigerant pipe 15 by performing a control calculation based on the pressure detection value detected by the pressure detector 42.

Next, the operation of the composite refrigerant circuit equipment according to the fifth embodiment will be described. For example, when the load decreases in the refrigeration side refrigerant circuit, the refrigerant liquid corresponding to the surplus refrigerating capacity is supplied to the refrigeration side heat storage evaporator 8b through the respective refrigeration side heat storage electromagnetic valves 9 and the respective refrigeration side heat storage expansion valves 10. To be done. This refrigerant is heat-exchanged with water flowing through the water pipe 47b in the refrigerating side heat storage evaporator 8b by the pump 48, whereby cold heat of the refrigerant is stored in the heat storage tank 37. At this time, the pressure on the suction side of the refrigeration side compressor 1, which changes corresponding to the surplus refrigeration capacity, is detected by the pressure detector 42.
Therefore, when the surplus refrigerating capacity is large, the control device 4
Reference numeral 3b denotes each of the refrigeration side heat storage solenoid valves 9 so as to increase the number of refrigeration side heat storage solenoid valves 9 to be opened based on the pressure detection value.
The open / close signal is output to. As a result, the cool storage capacity is increased by increasing the total amount of the refrigerant flowing through the refrigerating-side heat storage evaporator 8b. On the contrary, when the surplus refrigerating capacity is small, the number of the refrigerating-side heat storage electromagnetic valves 9 to be opened is reduced to reduce the total amount of the refrigerant flowing through the refrigerating-side heat storage evaporator 8b, thereby reducing the cold storage capacity. Is reduced.
In this way, by controlling the flow rate of the refrigerant to the refrigeration side heat storage evaporator 8b according to the surplus refrigerating capacity, it is possible to receive the amount of cold heat from the refrigerant corresponding to the surplus refrigerating capacity. Moreover, the cold heat from the refrigerant is efficiently stored in the heat storage tank 37 by the water flowing through the water pipe 47b when the pump 48 is driven. This will not adversely affect refrigerated foods stored in showcases, etc.
It is the same as in the case of the above-described Embodiment 3 that the accuracy of maintaining the temperature of these refrigerated foods can be improved.
In the fifth embodiment, an example of storing the excess cold heat from the refrigeration side refrigerant circuit is shown, but it goes without saying that the present invention can also be applied to a configuration for taking out the cold heat from the heat storage tank 37 in the freezing side refrigerant circuit.

Example 6. 6 is a configuration diagram showing a refrigeration side refrigerant circuit in a composite type refrigerant circuit facility according to Embodiment 6 of the present invention. The same components as those of the embodiments described above are designated by the same reference numerals, and the description thereof will be omitted. In the figure, 8c is a refrigerating-side switching heat exchanger for storing excess cold heat in the refrigerating-side refrigerant circuit in the heat storage tank 37 or supplying cold heat from the heat-reserving tank 37 to the refrigerating-side refrigerant circuit. The refrigerating-side switching heat exchanger 8c contains a part of the refrigerating-side heat storage refrigerant pipe 15 connected in parallel with the refrigerant pipe 6 of the refrigerating-side refrigerant circuit. In particular, refrigerating-side supercooling is performed on the pipe between the refrigerating-side heat storage expansion valve 10 of the refrigerant pipe 15 and the refrigerating-side switching heat exchanger 8c inlet side, and on the refrigerating-side switching heat exchanger 8c outlet side. Refrigerant pipes 14 are branched and connected. Further, reference numeral 12b is a refrigeration side switching solenoid valve for connecting and disconnecting the circulation of the refrigerant in the refrigerant pipe 15, and reference numerals 12 and 13 are refrigeration side supercooling switching solenoid valves.

Next, the operation of the composite refrigerant circuit equipment according to the sixth embodiment will be described. First, in the refrigeration side refrigerant circuit, the refrigeration side subcooling switching solenoid valves 12 and the refrigeration side switching solenoid valves 12b (each an example of a circuit opening / closing device) are closed, and the refrigeration side subcooling switching electromagnetic valve 13 (an example of a circuit opening / closing device). When the operation of the refrigerating cycle is started in the state where) is opened, the refrigerating side evaporator 5 cools the showcase and the like. Then, when the load is reduced and surplus refrigeration capacity is generated, a control device (not shown) (an example of a refrigerant flow path control device) is shown.
Thus, the refrigerating side switching solenoid valve 12b is opened. As a result, the refrigerant from the refrigeration side condenser 2 is guided to the refrigeration side heat storage refrigerant pipe 15 and flows into the refrigeration side heat exchanger 8c through the refrigeration side heat storage solenoid valve 9 and the refrigeration side heat storage expansion valve 10. Excessive cold heat is stored in the heat storage tank 37 by exchanging heat with the water flowing through the water pipe 47. That is, in this case, the refrigerating-side switching heat exchanger 8c functions as a refrigerating-side heat storage evaporator.

On the contrary, when the load increases and exceeds the original maximum refrigerating capacity of the refrigeration side refrigerant circuit, each refrigeration side subcooling switching solenoid valve 12 is opened, and the refrigeration side subcooling switching solenoid valve 13 and the refrigeration side switching solenoid are opened. The valve 12b is closed. As a result, the refrigerant from the refrigeration side condenser 2 receives the cold heat of the heat storage tank 37 by flowing into the refrigeration side switching heat exchanger 8c through the refrigerant pipe 14 and exchanging heat with the water flowing through the water pipe 47. After being cooled by cooling, it is guided to the refrigerating side evaporator 5. That is, in this case, the refrigerating-side switching heat exchanger 8c functions as a refrigerating-side supercooling heat exchanger. At this time, depending on the relative relationship between the refrigeration capacity controllable range by the refrigeration side expansion valve 4, the heat exchange capacity in the refrigeration side evaporator 5, and the load amount, the refrigerant is in a liquid state without being completely evaporated in the refrigeration side evaporator 5. Therefore, there is a case in which it is sucked into the refrigeration side compressor 1 into an inconvenient state. In such a state, the control device 43a calculates this state based on the pressure detection value from the pressure detector 42.
It detects and controls the inverter 49 and the pump 48 according to this detection result, and controls the water circulation amount to the refrigerating-side switching type heat exchanger 8c. As a result, the subcooling capacity of the refrigeration-side switching heat exchanger 8c for the refrigerant is adjusted. As a result, it is possible to avoid the disadvantage that the refrigerant is sucked into the refrigeration side compressor 1 in a liquid state. As described above, according to the composite refrigerant circuit facility according to this embodiment, the functions of the refrigerating-side switching heat exchanger 8c are the same as those of the heat storage evaporator and the supercooling heat exchanger depending on the load amount. Since it is switched to the function, one refrigerating-side switching heat exchanger 8c can be shared as a heat storage evaporator and a supercooling heat exchanger. Therefore, the manufacturing cost of the initials related to the heat exchanger can be reduced. Further, since the amount of supercooling is controlled according to the operating state at that time while detecting the operating state during supercooling, the refrigeration side compressor 1 remains in the liquid state of the refrigerant.
Can be prevented, and the reliability of the apparatus of this embodiment is improved. In addition, although the example of the refrigeration side refrigerant circuit has been shown in the sixth embodiment, such a configuration can be applied to the freezing side refrigerant circuit.

Example 7. FIG. 7 is a configuration diagram showing a refrigerating-side refrigerant circuit in a composite refrigerant circuit facility according to Embodiment 7 of the present invention. The same components as those of the embodiments described above are designated by the same reference numerals, and the description thereof will be omitted. In the figure, 53 is a temperature detector (an example of a heat storage amount detecting device) that is arranged in the heat storage tank 37 to detect the temperature of the water in the heat storage tank 37, and 54 is each refrigerating unit based on a detection signal from the temperature detector 53. It is a control device (an example of a refrigerant flow path control device) that controls opening / closing of the side supercooling switching solenoid valve 12, the refrigeration side supercooling switching solenoid valve 13, and the refrigeration side switching solenoid valve 12b.

Next, the operation of the composite refrigerant circuit equipment according to this embodiment will be described. Since the volume of water in the heat storage tank 37 is constant, the amount of cold storage in the heat storage tank 37 can be easily obtained from the temperature of the water in the heat storage tank 37. However, particularly when the amount of cold storage in the heat storage tank 37 is too small, for example, when the refrigerating side refrigerant circuit requires refrigerating capacity, the necessary supercooling of the refrigerant cannot be sufficiently performed at this time. Therefore, for example, when the minimum amount of cold storage in the heat storage tank 37 is set in advance and the amount of cold storage in the heat storage tank 37 is below the amount of cold storage equivalent to the minimum amount of cold storage and there is a margin in the refrigerating capacity of the refrigeration side refrigerant circuit, The control device 54 closes each refrigeration side subcooling switching solenoid valve 12 and opens the refrigeration side subcooling switching solenoid valve 13 and the refrigeration side switching solenoid valve 12b. As a result, the refrigeration side switching heat exchanger 8
c functions as a heat storage evaporator, and the excess cold heat in the refrigeration side refrigerant circuit is stored in the heat storage tank 37 via the water pipe 47 and the pump 48.
Store cold in.

On the other hand, when the amount of cold storage in the heat storage tank 37 becomes equal to or more than the amount of cold storage corresponding to the minimum amount of cold storage, the control device 54 opens each refrigerating-side supercooling switching solenoid valve 12 and at the same time, the refrigerating-side supercooling switching solenoid. The valve 13 and the refrigerating side switching solenoid valve 12b are closed. As a result, the refrigerating-side switching heat exchanger 8c functions as a supercooling heat exchanger for taking out cold heat,
The cold heat of the heat storage tank 37 is applied to the refrigerant in the refrigerant pipe 14 via the water pipe 47 and the pump 48. The refrigerant thus cooled is sequentially supplied to the refrigeration side solenoid valve 3, the refrigeration side expansion valve 4, and the refrigeration side evaporator 5, thereby supplementing the refrigerating capacity required in the refrigeration side refrigerant circuit. Thus, according to the composite refrigerant circuit facility according to this embodiment, the functions of the refrigerating-side switching heat exchanger 8c are the functions of the heat storage evaporator and the supercooling heat depending on the amount of cold storage in the heat storage tank 37. Since it is switched to the function of the exchanger, one refrigerating-side switching heat exchanger 8c can be commonly used as a heat storage evaporator or a supercooling heat exchanger in a switchable manner. Therefore, the manufacturing cost of the initials related to the heat exchanger can be reduced.

Example 8. 8 is a block diagram showing a composite refrigerant circuit facility according to Embodiment 8 of the present invention. In the drawing, the same components as those of the respective embodiments described so far are designated by the same reference numerals, and the description thereof will be omitted. The composite refrigerant circuit equipment according to this embodiment has substantially the same basic configuration as the composite refrigerant circuit equipment according to the embodiment 1 shown in FIG. 1, and the difference in the configuration also has the function of the refrigeration side condenser. The heat exchanger 31a for subcooling on the freezing side is placed in the heat storage tank 37 in place of the heat exchanger 31 for subcooling on the freezing side (see FIG. 1), and along with this, the condenser 22 for the freezing side (see FIG. 1) is omitted.

The basic operation of the composite refrigerant circuit equipment according to this embodiment is almost the same as that of the first embodiment. Therefore, the cold heat stored in the heat storage tank 37 from the refrigeration side refrigerant circuit is consumed in the freezing side refrigerant circuit. As already described, the cold heat is stored in the refrigeration side refrigerant circuit having a high refrigerant evaporation temperature in the refrigeration side evaporator 5, that is, a high refrigeration efficiency, and has a low refrigerant evaporation temperature in the refrigeration side evaporator 25, that is, a refrigeration efficiency. Used in low refrigeration side refrigerant circuits. In this case, in the heat exchanger 31a for subcooling on the freezing side, in particular, the high temperature refrigerant from the compressor 21 on the freezing side is directly heat-exchanged with the water in the heat storage tank 37 to be condensed and further supercooled, so that the heat storage The cold heat of the tank 37 can be efficiently used. In addition, since the freezing-side supercooling heat exchanger 31a serves as both the freezing-side condenser and the freezing-side supercooling heat exchanger, it is possible to reduce the initial manufacturing cost of the heat exchanger.

[0052]

Since the present invention is constructed as described above, it has the following effects.

Excessive cold heat from the high-cooling temperature side (first) refrigerant circuit having high refrigeration efficiency between the plurality of refrigerant circuits respectively cooling the plurality of cooled environments having different cooling temperatures is stored in the heat storage tank. Since the refrigerant circuit is moved to the low cooling temperature side (second) refrigerant circuit with low refrigeration efficiency via the agent, it is possible to improve the overall refrigeration efficiency of the entire equipment.

Further, depending on the surplus cold heat quantity of the refrigerant circuit on the high cooling temperature side (first) (corresponding to the physical quantity such as the inlet pressure of the (first) compressor or the environment temperature to be cooled), the heat storage Since the amount of refrigerant flowing from the first refrigerant circuit to the heat exchanger is controlled, the amount of accumulated cold heat can be controlled.
Therefore, for example, the heat is not excessively stored in the heat exchanger for cold storage, so that the refrigerating capacity provided to the refrigerating side evaporator placed in the first environment to be cooled does not become insufficient, and the first heat is not stored. It does not raise the temperature of the cooling environment to a temperature that is inconvenient for it.

On the contrary, in accordance with the insufficient refrigerating capacity of the refrigerant circuit on the low cooling temperature side (second) (corresponding to the physical quantity such as the inlet pressure of the (second) compressor or the environment temperature to be cooled), Since the amount of refrigerant flowing from the second refrigerant circuit to the heat storage heat exchanger is controlled, the amount of cold heat received from the heat storage tank can be controlled.

Further, since the heat storage agent from the heat storage tank is forcedly circulated toward each of the heat storage heat exchanger and the cold heat supply heat exchanger for sending and receiving cold heat to and from the heat storage agent, It is possible to improve the movement efficiency.

Since the circulation amount of the heat storage agent from the heat storage tank to the heat storage heat exchanger is controlled in accordance with the surplus cold heat amount in the first refrigerant circuit, the surplus cold heat storage amount is controlled. Can be controlled.

On the contrary, since the circulation amount of the heat storage agent from the heat storage tank to the heat exchanger for supplying cold heat is controlled in accordance with the refrigerating capacity lacking in the second refrigerant circuit, the lacking refrigerating capacity of this lacking refrigerating capacity is controlled. You can control how much you cover.

Further, one heat storage heat exchanger connected to the first refrigerant circuit is reasonably used as a heat storage evaporator or a supercooling heat exchanger depending on the amount of heat stored by the heat storage agent. Since they are used properly, the manufacturing cost of the initials for the heat exchanger can be reduced.

Since the refrigerant in the second condenser of the second refrigerant circuit and the heat storage agent in the heat storage tank are exchanged with each other, the cold heat stored in the heat storage tank can be efficiently used. In addition, since the second condenser also serves as the original condenser and the heat exchanger for supercooling, the manufacturing cost of the initials for the heat exchanger can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a composite refrigerant circuit facility according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a composite refrigerant circuit facility according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a composite refrigerant circuit facility according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a main part of a refrigeration side refrigerant circuit in a composite refrigerant circuit facility according to Embodiment 4 of the present invention.

FIG. 5 is a configuration diagram showing a refrigerating-side refrigerant circuit in a composite refrigerant circuit facility according to Embodiment 5 of the present invention.

FIG. 6 is a configuration diagram showing a refrigerating-side refrigerant circuit in a composite refrigerant circuit facility according to Embodiment 6 of the present invention.

FIG. 7 is a configuration diagram showing a refrigeration side refrigerant circuit in a composite type refrigerant circuit facility according to Embodiment 7 of the present invention.

FIG. 8 is a configuration diagram showing a composite refrigerant circuit facility according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram showing a conventional composite refrigerant circuit facility.

[Explanation of symbols]

 1 Refrigerator side compressor 2 Refrigerator side condenser 3 Refrigerator side solenoid valve 4 Refrigerator side expansion valve 5 Refrigerator side evaporator 6 Refrigerant piping 8 Refrigerator side heat storage evaporator 8a Refrigerator side heat storage evaporator 8b Refrigerator side heat storage evaporator 8c Refrigerator-side switching heat exchanger 9 Refrigerator-side heat storage solenoid valve 10 Refrigerator-side heat storage expansion valve 12 Refrigerator-side supercooling selector solenoid valve 12b Refrigerator-side selector solenoid valve 13 Refrigerator-side supercooler selector solenoid valve 14 Refrigerant pipe 15 Refrigerant pipe 21 Freezing side compressor 22 Freezing side condenser 23 Freezing side solenoid valve 24 Freezing side expansion valve 25 Freezing side evaporator 26 Refrigerant piping 26a Refrigerant piping 31 Freezing side supercooling heat exchanger 31a Freezing side supercooling heat exchanger 34a Refrigerant Piping 37 Heat storage tank 42 Pressure detector 43 Control device 43a Control device 43b Control device 44 Flow rate adjusting valve 45 Pressure detector 46 Control device 46b Control device 47 Water pipe 47b Pipe 48 the pump 49 inverter 50 water pipe 51 the pump 52 inverter 53 temperature detector 54 controller 57 flow control valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatake Ikeuchi 6-5-6 Tehira, Wakayama City Wakayama Works, Mitsubishi Electric Corporation (72) Inventor Koichi Negoro 6-566 Tehira, Wakayama Mitsubishi (72) Inventor, Koichi Ohata, 2-2, Dojima, Kita-ku, Osaka City, Mitsubishi Electric Corporation (72) Inventor, Tadaaki Nakano 2--2, Dojima, Kita-ku, Osaka Mitsubishi Electric Corporation Kansai branch office

Claims (8)

[Claims] 1. A first refrigerant in which a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first cooled environment are sequentially connected in an annular shape. A circuit and the first
Through a heat storage refrigerant circuit in which a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the refrigerant circuit in parallel with the first expansion device and the first evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage agent for storing cold heat corresponding to a difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment; a second compressor; Second refrigerant formed by sequentially connecting the condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment, in order. Circuit and the second
A heat exchanger for supplying cold heat, which is connected between the second condenser and the second evaporator of the refrigerant circuit and supplies the cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit. Combined type refrigerant circuit equipment comprising the cold heat supply circuit of. 2. A first refrigerant in which a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled are sequentially connected in an annular shape. A circuit and the first
Through a heat storage refrigerant circuit in which a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the refrigerant circuit in parallel with the first expansion device and the first evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage agent for storing cold heat corresponding to a difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment; a second compressor; Second refrigerant formed by sequentially connecting the condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment, in order. Circuit and the second
A heat exchanger for supplying cold heat, which is connected between the second condenser and the second evaporator of the refrigerant circuit and supplies the cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit. A cooling power supply circuit, a first refrigerating capacity detecting device for detecting a physical quantity corresponding to the refrigerating capacity given to the first cooled environment, a maximum refrigerating capacity of the first refrigerant circuit and the detected Based on the difference from the refrigerating capacity corresponding to the physical quantity, the first
And a first refrigerant flow rate control device for controlling the flow rate of the refrigerant from the refrigerant circuit to the heat storage heat exchanger. 3. A first refrigerant in which a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first cooled environment are sequentially connected in an annular shape. A circuit and the first
Through a heat storage refrigerant circuit in which a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the refrigerant circuit in parallel with the first expansion device and the first evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage agent for storing cold heat corresponding to a difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment; a second compressor; Second refrigerant formed by sequentially connecting the condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment, in order. Circuit and the second
A heat exchanger for supplying cold heat, which is connected between the second condenser and the second evaporator of the refrigerant circuit and supplies the cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit. Cooling power supply circuit, a second refrigerating capacity detecting device for detecting a physical quantity corresponding to the refrigerating capacity given to the second cooled environment, the maximum refrigerating capacity of the second refrigerant circuit and the detected Based on the difference from the refrigerating capacity corresponding to the physical quantity, the second
And a second refrigerant flow rate control device for controlling the flow rate of the refrigerant from the refrigerant circuit to the heat exchanger for supplying cold heat. 4. A first refrigerant in which a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first cooled environment are sequentially connected in an annular shape. A circuit and the first
Through a heat storage refrigerant circuit in which a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the refrigerant circuit in parallel with the first expansion device and the first evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage agent for storing cold heat corresponding to a difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment; a second compressor; Second refrigerant formed by sequentially connecting the condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment, in order. Circuit and the second
A heat exchanger for supplying cold heat, which is connected between the second condenser and the second evaporator of the refrigerant circuit and supplies the cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit. Of the cold heat supply circuit, the heat storage heat exchanger and the heat storage tank are provided between the heat storage tank to circulate the heat storage agent from the heat storage heat exchanger to circulate the refrigerant from the refrigerant of the heat storage heat exchanger. The first heat storage agent circulating device for giving heat to the agent, the heat exchanger for cold heat supply and the heat storage tank provided between the heat storage tank to circulate the heat storage agent from the heat storage tank to circulate the heat storage agent for cold heat supply. And a second heat storage agent circulating device for giving cold heat to the refrigerant of 1. 5. A first refrigerant in which a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first cooled environment are sequentially connected in an annular shape. A circuit and the first
Through a heat storage refrigerant circuit in which a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the refrigerant circuit in parallel with the first expansion device and the first evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage agent for storing cold heat corresponding to a difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment; a second compressor; Second refrigerant formed by sequentially connecting the condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment, in order. Circuit and the second
A heat exchanger for supplying cold heat, which is connected between the second condenser and the second evaporator of the refrigerant circuit and supplies the cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit. Of the cold heat supply circuit, the heat storage heat exchanger and the heat storage tank are provided between the heat storage tank to circulate the heat storage agent from the heat storage tank to cool the heat from the refrigerant of the heat storage heat exchanger. The first heat storage agent circulating device for giving heat to the agent, the heat exchanger for cold heat supply and the heat storage tank provided between the heat storage tank to circulate the heat storage agent from the heat storage tank to circulate the heat storage agent for cold heat supply. Second heat storage agent circulating device for giving cold heat to the refrigerant, a first refrigerating capacity detecting device for detecting a physical quantity corresponding to the refrigerating capacity given to the first cooled environment, and the first refrigerant circuit Based on the difference between the maximum refrigerating capacity of and the refrigerating capacity corresponding to the detected physical quantity. First heat storage agent circulation device first heat storage agent circulation quantity control device and the composite refrigerant circuit equipment consisting comprises a for controlling the circulation rate of the heat storage agent according to. 6. A first refrigerant formed by sequentially connecting a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled in an annular shape. A circuit and the first
Through a heat storage refrigerant circuit in which a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the refrigerant circuit in parallel with the first expansion device and the first evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage agent for storing cold heat corresponding to a difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment; a second compressor; Second refrigerant formed by sequentially connecting the condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment, in order. Circuit and the second
A heat exchanger for supplying cold heat, which is connected between the second condenser and the second evaporator of the refrigerant circuit and supplies the cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit. Of the cold heat supply circuit, the heat storage heat exchanger and the heat storage tank are provided between the heat storage tank to circulate the heat storage agent from the heat storage tank to cool the heat from the refrigerant of the heat storage heat exchanger. The first heat storage agent circulating device for giving heat to the agent, the heat exchanger for cold heat supply and the heat storage tank provided between the heat storage tank to circulate the heat storage agent from the heat storage tank to circulate the heat storage agent for cold heat supply. Second heat storage agent circulating device for applying cold heat to the refrigerant, a second refrigerating capacity detecting device for detecting a physical quantity corresponding to the refrigerating capacity given to the second cooled environment, and the second refrigerant circuit Based on the difference between the maximum refrigerating capacity of and the refrigerating capacity corresponding to the detected physical quantity. The second heat storage agent circulation quantity control device and comprising comprises a composite refrigerant circuit equipment for controlling the circulation rate of the heat storage agent according to the second heat storage agent circulation system. 7. A first refrigerant formed by sequentially connecting a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first cooled environment in an annular shape. A circuit and the first
Through a heat storage refrigerant circuit in which a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the refrigerant circuit in parallel with the first expansion device and the first evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage agent for storing cold heat corresponding to a difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment; a second compressor; Second refrigerant formed by sequentially connecting the condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment, in order. Circuit and the second
A heat exchanger for supplying cold heat, which is connected between the second condenser and the second evaporator of the refrigerant circuit and supplies the cold heat from the heat storage agent of the heat storage tank to the second refrigerant circuit. The cold heat supply circuit, the first condenser of the first refrigerant circuit, and the first expansion device, and a circuit opening / closing device for opening / closing the flow path, which is connected in series. A second cold heat supply circuit that supplies the cold heat of the heat storage agent in the heat storage tank to the first refrigerant circuit by diverting the refrigerant from the condenser of the heat storage heat exchanger to the heat storage agent in the heat storage tank; A heat storage amount detection device that detects a heat storage amount, and a circuit flow path is formed by opening and closing the circuit opening / closing device based on the detected heat storage amount of the heat storage agent to form the heat storage refrigerant circuit and the second cold heat supply circuit. Combined type refrigerant circuit equipment comprising a refrigerant flow control device for switching to. 8. A first refrigerant in which a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first cooled environment are sequentially connected in an annular shape. A circuit and the first
Through a heat storage refrigerant circuit in which a heat storage expansion device and a heat storage heat exchanger are sequentially connected to the refrigerant circuit in parallel with the first expansion device and the first evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage agent for storing cold heat corresponding to a difference between the maximum refrigerating capacity of the first refrigerant circuit and the required refrigerating capacity of the first cooled environment; a second compressor; Second refrigerant formed by sequentially connecting the condenser, the second expansion device, and the second evaporator that cools the second cooled environment whose temperature is lower than that of the first cooled environment, in order. In a composite refrigerant circuit facility including a circuit, the second condenser is provided in the heat storage tank so that cold heat from the heat storage agent can be supplied to the second refrigerant circuit. Refrigerant circuit equipment.