JP3046169B2 - Complex refrigerant circuit equipment - Google Patents

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 for cooling respective cooled environments having different cooling temperature ranges, that is, different refrigerant evaporation temperatures of evaporators, and a heat storage tank for storing cold heat. The present invention relates to a combined type refrigerant circuit equipment comprising:

[0002]

2. Description of the Related Art FIG. 9 shows a configuration of a conventional complex type refrigerant circuit equipment for cooling a refrigerator or a showcase as an environment to be cooled in, for example, a food processing center or a food store. In the figure, 1 is a refrigerator-side compressor (first compressor), 2 is a refrigerator-side condenser (first condenser), and 3 is a supply to a refrigerator-side evaporator (first evaporator) indicated by 5. A refrigeration-side solenoid valve for interrupting the refrigerant to be connected, 4 is a refrigeration-side expansion valve (an example of a first expansion device), and 6 is a refrigeration-side refrigerant pipe connecting these.
Further, 7 is a refrigeration-side heat storage tank containing a heat storage agent such as water, 8 is a refrigeration-side heat storage evaporator (heat storage heat exchanger), 9
Is a refrigeration-side heat storage solenoid valve for interrupting the refrigerant supplied to the refrigeration-side heat storage evaporator 8, 10 is a refrigeration-side heat storage expansion valve (an example of a heat storage throttle device), and 11 is a refrigeration-side supercooling heat exchanger. And 12 and 13 are refrigeration side supercooling switching solenoid valves and 1
Reference numeral 4 denotes a refrigerant pipe for refrigeration side supercooling which is communicated with the refrigerant pipe 6 and bypasses and sends the refrigerant to the refrigeration side supercooling heat exchanger 11. Reference numeral 15 denotes an evaporator for refrigeration side heat storage which is communicated in parallel with the refrigerant pipe 6. 2 shows a refrigerant pipe for sending a refrigerant to a vessel 8. 1 to 1
From the components denoted by reference numeral 5, for example, a showcase in which the refrigeration-side evaporator 5 is placed (an example of a first cooled environment, which is set to a target temperature exceeding 0 ° C., for example)
A refrigeration-side refrigerant circuit [(an example of a first refrigerant circuit)] that cools the refrigerant is configured.

[0003] Further, 21 is a refrigerating side compressor (second compressor), 22 is a refrigerating side condenser (second condenser), and 23 is 2
A refrigeration-side solenoid valve for interrupting the refrigerant supplied to the refrigeration-side evaporator (second evaporator) indicated by 5, 24 is a refrigeration-side expansion valve (an example of a second expansion device), and 26 communicates them. 3 shows a refrigerant pipe on the refrigeration side. Further, reference numeral 27 denotes a freezing-side heat storage tank containing a heat storage agent such as water, 28 denotes a freezing-side heat storage evaporator, and 29 denotes a freezing-side heat storage for intermittently supplying a refrigerant supplied to the freezing-side heat storage evaporator 28. Solenoid valve, 30 is a freezing-side heat storage expansion valve, 31 is a freezing-side supercooling heat exchanger (heat exchanger for supplying cold heat), 32 and 33 are freezing-side supercooling switching solenoid valves, respectively, and 34 is a refrigerant pipe 26. A refrigerant pipe for refrigeration-side supercooling for communicating and bypassing the refrigerant to the refrigeration-side supercooling heat exchanger 31, a refrigerant pipe 35 for communicating with the refrigerant pipe 26 in parallel to send refrigerant to the refrigeration-side heat storage evaporator 28. 1 shows a refrigerant pipe for use. From the components denoted by reference numerals 21 to 35, for example, a freezer in which the freezing-side evaporator 25 is placed (an example of a second cooled environment, which is set to a target temperature of 0 ° C. or lower, for example) A refrigeration-side refrigerant circuit [(an example of a second refrigerant circuit)] is configured to cool the refrigerant. It should be noted that illustrations of load-side devices such as showcases, refrigerators, freezers and the like in stores and the like are omitted here.

Next, the operation of the conventional equipment will be described with reference to FIG. First, in the refrigeration-side refrigerant circuit, the high-temperature, high-pressure gas compressed by the refrigeration-side compressor 1 in a state where each refrigeration-side subcooling switching electromagnetic valve 12 is closed and the refrigeration-side supercooling switching electromagnetic valve 13 is opened. The refrigerant is cooled by the refrigeration condenser 2
After being liquefied and decompressed by the refrigeration side expansion valve 4 via the refrigeration side solenoid valve 3, it flows into the refrigeration side evaporator 5, evaporates and absorbs heat, cools the showcase and the refrigerator, and returns to the refrigeration side compressor 1. I do. Thereafter, a similar cycle is repeated. When the refrigerating capacity required for setting the environment to be cooled to a preset target temperature (this refrigerating capacity is referred to as “load”) increases, the refrigerating-side supercooling switching electromagnetic valve 13 is closed and each refrigeration unit is closed. The refrigerant from the refrigeration-side condenser 2 is guided to the refrigeration-side supercooling heat exchanger 11 by opening the side-side supercooling switching solenoid valve 12, and the cold heat previously stored in the refrigeration-side heat storage tank 7 is taken out and displayed. Provide for cooling the case etc. The refrigeration-side solenoid valve 3 opens and closes according to the load condition obtained based on the output result of a temperature controller (not shown) attached to a showcase or the like, and causes the refrigerant to flow into the refrigeration-side evaporator 5. Controls liquid supply. On the other hand, the operation of the refrigeration-side refrigerant circuits 21 to 35 is different in that the evaporation temperature of the refrigerant in the refrigeration-side evaporator 25 is set lower than the evaporation temperature in the refrigeration-side evaporator 5 of the refrigeration-side refrigerant circuit. Only the other components are the same as those of the refrigeration-side refrigerant circuit, and a description thereof will be omitted.

[0005]

The refrigerant circuit on the refrigeration side, that is, the refrigerant circuit having a low evaporating temperature of the refrigerant in the evaporator, is generally in comparison with the refrigeration side refrigerant circuit having a high evaporating temperature.
It is said that the refrigeration efficiency is low. And, as mentioned above,
In the conventional combined refrigerant circuit equipment, the refrigeration-side refrigerant circuit and the refrigeration-side refrigerant circuit are separately and independently separated according to a target evaporation temperature. Therefore, there is a difference in refrigeration efficiency between the refrigerant circuits, and it cannot be said that the overall refrigeration efficiency of the entire equipment is good.

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

Further, during the cold storage operation, excess cold heat may be stored at the same time as cooling the environment to be cooled. However, if 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, an object to be cooled stored in a showcase or a refrigerator may increase.

If the heat exchange capacity of the supercooling heat exchanger exceeds the capacity control range of the expansion valve, the gas-liquid mixed refrigerant is returned to the suction side of the compressor as it is, and adversely affects mechanical effects. There is a problem that this may cause the reliability of the equipment to be reduced.

[0009] Since the regenerative heat exchanger and the subcooling heat exchanger are provided separately and independently, the initial production cost for these heat exchangers is large, and there is room for improvement in terms of investment effects. was there.

Further, even if the evaporation temperature of the refrigerant in the evaporator is the same, if a plurality of refrigerant circuits are provided depending on the type of the environment to be cooled, the load state of the environment to be cooled in each system is In many cases, it is not uniform, and the operating rates of the compressors of each system vary, and there is room for improvement in the overall operating efficiency of all the compressors.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and the entire facility is moved by transferring excess cold heat from a refrigerant circuit having a high refrigeration efficiency to a refrigerant circuit having a low refrigeration efficiency. It is an object of the present invention to provide a composite refrigerant circuit equipment capable of improving overall refrigeration efficiency.

It is another object of the present invention to provide a composite refrigerant circuit having excellent cooling and heat transfer efficiency of surplus cold heat between a plurality of refrigerant circuits.

[0013] Further, in the case of storing surplus cold heat at the same time as cooling the environment to be cooled during the cold storage operation, by appropriately controlling the amount of cold storage, the cooling capacity for a showcase, a refrigerator or the like is reduced. It is an object of the present invention to provide a composite refrigerant circuit equipment that can prevent the temperature of the object to be cooled stored in the refrigerant circuit from rising.

It is another object of the present invention to provide a composite refrigerant circuit system which does not impair the reliability of the system, in which the gas-liquid mixed refrigerant is returned to the suction side of the compressor as it is and causes mechanical adverse effects. Is what you do.

It is another object of the present invention to provide a composite refrigerant circuit system capable of reducing the initial production cost of the heat exchanger for cold storage and the heat exchanger for supercooling.

[0016]

Means for Solving the Problems In order to achieve the above object, the composite refrigerant circuit equipment according to the present invention employs the following technical means. That is, the combined refrigerant circuit equipment according to the first aspect of the present invention includes a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. One or more systems connected in a ring
A first refrigerant circuit, the first compressor, and the first condenser
A heat storage refrigerant circuit in which a condenser, a heat storage expansion device, and a heat storage heat exchanger are sequentially connected; the heat storage heat exchanger;
The heat storage agent of the heat storage tank is interposed between the heat storage tank and the heat storage agent.
The refrigerant is circulated through the heat storage heat exchanger to cool the heat storage refrigerant circuit.
A first heat storage agent circulating device for exchanging heat with a medium;
A heat storage tank containing a heat storage agent for storing cold heat through the heat storage heat exchanger by the refrigerant circuit; and a second compressor, a second condenser, and cold heat for supplying cold heat from the heat storage agent in the heat storage tank.
A first cold heat supply circuit having a heat exchanger for supply , a second expansion device, and a second evaporator for cooling a second cooled environment which is cooled to a temperature lower than the first cooled environment. It is characterized by having one or more second refrigerant circuits connected in a ring.

The combined refrigerant circuit equipment according to the second aspect of the present invention provides a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. A plurality of first refrigerant circuits, which are sequentially connected in a ring shape, a heat storage tank containing a heat storage material, the first compressor, and the first compressor.
A plurality of heat storage refrigerant circuits sequentially connecting a condenser, a heat storage expansion device, and a heat storage heat exchanger; and the first refrigerant circuit.
Subcooling between the first condenser and the first throttle device in the path
Plurality of second cold heat supply circuits connected to a heat exchanger
And the heat storage agent in the heat storage tank in parallel with the heat storage heat exchanger.
When circulated to exchange heat with the refrigerant in the heat storage refrigerant circuit
In both cases, the heat storage agent in the heat storage tank is transferred to the supercooling heat exchanger.
The heat storage tank circulates in parallel to store the refrigerant from the first condenser.
A first heat storage agent circulating device for supplying cold heat of the heat storage agent, a second compressor, a second condenser, and a heat storage agent from the heat storage tank.
First cold heat having a cold heat supply heat exchanger for supplying cold heat
Supply circuit, a second throttle device, and the second of the first 1 or more systems formed by connecting the second second evaporator for cooling the cooled environment successively annularly also be cold from the cooled environment And two refrigerant circuits.

The combined refrigerant circuit equipment according to the third aspect of the present invention provides a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. One or more first refrigerant circuits formed by sequentially connecting the vessels in a ring,
Said first compressor, said first condenser, and heat storage expansion device and <switchable> 1 or more thermal storage refrigerant circuit that is opened and closed controlled becomes sequentially connecting the heat storing heat exchanger, for the heat storage Refrigerant
A heat storage tank containing a heat storage agent that stores cold heat through the heat storage heat exchanger by a circuit; and a heat storage tank of the first refrigerant circuit.
Wherein between the first condenser and the first throttle device <-selecting>
One or more heat storage heat exchangers are connected and controlled to open and close.
A second cold heat supply circuit, a second compressor, a second condenser,
Cold supply heat for supplying cold from the heat storage agent in the heat storage tank
A first cold heat supply circuit having an exchanger, a second expansion device,
And further comprising a first second second evaporator sequentially formed by connecting in a ring one or more systems of a second refrigerant circuit for cooling the cooled environment is a low temperature than the cooled environment It is characterized by the following.

[0019] The combined refrigerant circuit equipment according to the invention of claim 4 is the heat storage tank according to claim 3.
The heat storage agent is circulated through the heat storage heat exchanger to
Heat exchange with the refrigerant in the refrigerant circuit, or the first condenser
Supplying the cold energy of the heat storage agent in the heat storage tank to the refrigerant from the first
Wherein the heat storage agent circulating device is provided.

The combined refrigerant circuit equipment according to the invention of claim 5 is the one according to claim 1, 2 or 4,
A first refrigeration function for detecting a refrigeration capacity of the first refrigerant circuit;
Force detection device and the output of the first refrigeration capacity detection device.
Controlling the flow rate of the refrigerant in the first heat storage agent circulating device
And a first heat storage agent circulation amount control device that performs
It is assumed that .

According to a sixth aspect of the present invention , there is provided the combined refrigerant circuit equipment according to the fifth aspect, wherein
Given to the first environment to be cooled by the refrigerating capacity detecting device.
Detecting the refrigerating capacity, and controlling the first heat storage agent circulation amount control device.
The maximum refrigeration capacity of the first refrigerant circuit and the detection
The first heat storage agent circulation based on a difference from the set refrigerating capacity.
The amount of circulation of the heat storage agent by the device is controlled .

The combined refrigerant circuit equipment according to the invention of claim 7 is the one according to claim 3 or 4 , wherein
A heat storage amount detection device that detects the heat storage amount of the heat storage agent in the heat storage tank,
Based on the output of the heat storage amount detection device, the heat storage refrigerant circuit
Refrigerant flow for controlling the opening and closing of the passage and the second cold heat supply circuit
A road control device is provided .

The combined refrigerant circuit equipment according to the invention of claim 8 includes a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled. One or more first refrigerant circuits formed by sequentially connecting the vessels in a ring,
The first compressor, the first condenser, the heat storage throttle device, and the heat storage refrigerant circuit sequentially connecting the heat storage heat exchanger, and the heat storage refrigerant circuit through the heat storage heat exchanger. A heat storage tank that contains a heat storage agent that stores cold heat, a second compressor, a second condenser, and the heat storage tank that is disposed in the heat storage tank.
Cold heat supply heat exchanger that supplies cold heat from the heat storage agent in the heat tank
A first cold-heat supply circuit having a second cooling device, and a second evaporator for cooling a second cooled environment to be cooled lower than the first cooled environment. Become one
A second refrigerant circuit of at least one system;
In parallel with the heat supply circuit, the second condenser
A bypass circuit for controllably diverting refrigerant to the expansion device
It is characterized by having been provided .

According to a ninth aspect of the present invention , there is provided the combined refrigerant circuit equipment according to the eighth aspect, wherein
Second refrigerating capacity detecting device for detecting refrigerating capacity of refrigerant circuit
If, on the basis of the output of the second refrigeration capacity detecting device
The second chiller for controlling the flow rate of the refrigerant in the first chiller supply circuit
And a medium flow control device .

According to a tenth aspect of the present invention , there is provided the combined refrigerant circuit equipment according to the ninth aspect, wherein
To the second environment to be cooled by the refrigerating capacity detecting device of
Detecting the resulting refrigeration capacity, the second refrigerant flow amount control instrumentation
The maximum refrigeration capacity of the second refrigerant circuit and the detection
The first cooling / heating supply circuit based on the difference from the set refrigeration capacity.
It is characterized in that the amount of refrigerant flowing through the road is controlled .

According to the eleventh aspect of the present invention, there is provided a combined refrigerant circuit system comprising: a first compressor, a first condenser, a first throttle device, and a first evaporator for cooling a first environment to be cooled. The first compressor circuit , the first condenser, the heat storage throttle device, and the heat storage heat exchanger are sequentially connected to one or more first refrigerant circuits formed by sequentially connecting the heat exchangers in a ring. A heat storage refrigerant circuit, a heat storage tank containing a heat storage agent that stores cold heat through the heat storage heat exchanger by the heat storage refrigerant circuit , a second compressor, a second condenser, and a heat storage tank. From heat storage
First cold heat having a cold heat supply heat exchanger for supplying cold heat
Supply circuit, a second throttle device, and the second of the first 1 or more systems formed by connecting the second second evaporator for cooling the cooled environment successively annularly also be cold from the cooled environment 2 between the refrigerant circuit, the cold heat supply heat exchanger and the heat storage tank.
The heat storage agent from the heat storage tank is interposed
The refrigerant in the second refrigerant circuit is circulated through the supply heat exchanger.
A second heat storage agent circulating device for exchanging heat with the second refrigerant;
Second refrigerating capacity detection device for detecting refrigerating capacity of medium circuit
If, on the basis of the output of the second refrigeration capacity detecting device
A second control unit that controls the flow rate of the refrigerant in the second heat storage agent circulating device
And a heat storage agent circulation amount control device .

[0027] According to a twelfth aspect of the present invention , there is provided the combined refrigerant circuit equipment according to the eleventh aspect, wherein
2 to the second environment to be cooled by the refrigerating capacity detecting device.
Detecting the obtained refrigerating capacity and performing the second heat storage agent circulation
The maximum refrigeration capacity of the second refrigerant circuit and the
The second heat storage agent based on a difference from the detected refrigerating capacity;
Controls the amount of heat storage agent circulated by the circulator.
Is what you do.

The combined refrigerant circuit equipment according to the thirteenth aspect of the present invention includes a first compressor, a first condenser, and a first throttle.
An apparatus and a first evaporator for cooling a first cooled environment.
One or more first refrigerant circuits sequentially connected in a ring
And the first compressor, the first condenser, and a heat storage throttle
Heat storage refrigerant consisting of a heat exchanger and a heat storage heat exchanger connected in sequence
Circuit, and the heat storage heat exchanger by the heat storage refrigerant circuit
A heat storage tank containing a heat storage agent for storing cold heat through the
2 supplies the cold heat from the heat storage agent in the heat storage tank
A first cold heat supply circuit having a cold heat supply heat exchanger,
And a lower temperature device than the first cooled environment.
A second evaporator for cooling a second cooled environment to be cooled.
And one or more second refrigerant circuits connected in a shape.
The heat exchanger for supplying cold heat is connected to the second refrigerant circuit.
It is characterized by functioning as a compressor .

The combined refrigerant circuit equipment according to the invention of claim 14 is the one according to any one of claims 1 to 13.
The refrigerant of the first evaporator in the first refrigerant circuit
The evaporation temperature of the second evaporator in the second refrigerant circuit
It is characterized by being set higher than the refrigerant evaporation temperature .

[0030]

In the combined refrigerant circuit equipment according to the present invention, a plurality of refrigerant circuits, each of which cools a plurality of environments to be cooled having different cooling temperatures, are connected between the first refrigerant circuit having a high refrigeration efficiency and a high cooling temperature. The surplus cold heat can be stored in the heat storage agent in the heat storage tank via the heat storage heat exchanger, and can be 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.

Further, excess cold from the first refrigerant circuit, as well to be moved [have] to the second refrigerant circuit through the heat storage tank, cold heat amount of the surplus first refrigerant circuit (first Corresponds to physical quantities such as compressor inlet pressure and temperature of the environment to be cooled)
Accordingly, the amount of refrigerant flowing from the first refrigerant circuit to the heat storage heat exchanger can be controlled. Thereby, the amount of cold storage of surplus cold heat can be controlled.

Conversely, heat exchange for heat storage from the second refrigerant circuit is performed in accordance with the refrigeration capacity insufficient in the second refrigerant circuit (corresponding to the physical quantity such as the inlet pressure of the second compressor and the temperature of the environment to be cooled). The amount of refrigerant flowing to the vessel can be controlled. Thereby, the amount of cold received from the heat storage tank can be controlled.

Further, the first heat storage agent circulating device and the second heat storage agent circulating device are directed to a heat storage heat exchanger and a 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 forcibly circulated. Therefore, the cold heat transfer efficiency can be improved.

Then, the first heat storage agent circulating amount control device is controlled by the first heat storage agent circulating device in accordance with the surplus amount of cooling heat in the first refrigerant circuit corresponding to the physical amount from the first refrigeration capacity detecting device. Control the circulation amount of the heat storage agent. Therefore, the amount of heat storage of the surplus cold heat from the first refrigerant circuit can be controlled.

Conversely, the second heat storage agent circulating amount control device controls the second heat storage agent circulating device in accordance with the insufficient refrigeration capacity in the second refrigerant circuit corresponding to the physical quantity from the second refrigeration capacity detection device. Controls the circulation amount of the heat storage agent. As a result, it is possible to control the amount of the insufficient refrigeration capacity in the second refrigerant circuit.

The heat storage amount of the heat storage agent is detected by a heat storage amount detecting device. The refrigerant flow path control device switches the refrigerant flow path in accordance with the detected heat storage amount, so that the first
One heat exchanger for heat storage connected to the refrigerant circuit is used as an evaporator or a condenser. Therefore, it is possible to reduce the initial production cost of the heat exchanger.

Since the second condenser is provided in the heat storage tank so as to be able to supply cold heat from the heat storage agent to the second refrigerant circuit, the high-temperature refrigerant from the second compressor is subjected to the second condensation. In the vessel, the heat is directly condensed by the 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 used efficiently. In addition, it is possible to reduce the initial production cost of the heat exchanger.

[0038]

[Embodiment 1] FIG. 1 is a configuration diagram showing a composite refrigerant circuit equipment according to a first embodiment of the present invention, wherein 1 to 6, 8 to 10, 15, 21 and 2 are used.
6 and 31 are the same as the above-mentioned conventional equipment.
Then , the refrigeration side compressor (first compressor) 1 and the refrigeration side condensation
(First condenser) 2, refrigeration-side expansion valve (first throttle device)
4) and the refrigerating side evaporator (first evaporator) 5
Connected to the first refrigerant circuit on the refrigeration side (or the first main circuit).
Road). In addition, the refrigeration side compressor (first compression
Machine) 1, refrigeration-side condenser (first condenser) 2, refrigeration-side heat storage
Expansion valve (throttle device for heat storage) 10 and refrigeration side heat storage evaporation
(Heat exchanger for heat storage) 8 are connected in order, and a refrigerant circuit for heat storage
(Or a sub-circuit). And this refrigerated side
The first refrigerant circuit and the refrigerant circuit for heat storage use the first refrigerant circuit on the refrigeration side.
Of the refrigerant circuit to be cooled.

Reference numeral 37 denotes a heat storage tank containing a heat storage agent such as water, and 34a denotes a refrigeration-side supercooling heat exchanger (heat exchanger for supplying cold heat) of a refrigeration-side refrigerant circuit provided in the heat storage tank 37.
To the refrigeration-side condenser (second condenser) 22 and the refrigeration-side solenoid valve 2
3 is a refrigerant pipe that communicates in series with the refrigerant pipe 26 between them. That is, the refrigeration side subcooling heat exchanger 31 and the refrigerant pipe 34
The configuration including a is an example of the first cold heat supply circuit. Then , the refrigeration side compressor (second compressor) 21
Side condenser (second condenser) 22, heat exchange for freezing side supercooling
Refrigeration-side expansion valve (first
2 throttling device) 24 and the freezing side evaporator (second evaporator)
Unit 25 is sequentially connected in a ring shape, and a second refrigerant circuit on the refrigeration side
(Or a second main circuit). And this frozen
On the side, the second cooled side of the refrigeration side in the second refrigerant circuit itself
It constitutes a refrigerant circuit. Further, in particular, in the combined refrigerant circuit equipment, the refrigeration-side heat storage evaporator 8 of the refrigeration-side refrigerant circuit is provided.
The heat storage tank 37 is also provided in the heat storage tank 37 so as to transfer heat to the freezing-side subcooling heat exchanger 31 via a heat storage agent.

Next, the operation of the combined 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 a maximum refrigeration capacity) for an environment to be cooled (a showcase or the like). Therefore, when the load applied to the showcase or the like decreases, the maximum load and the maximum load are reduced. At that time, a surplus refrigeration capacity is generated as a difference from the load applied to the showcase or the like. According to this combined refrigerant circuit equipment, an amount of refrigerant liquid corresponding to the surplus refrigeration capacity is supplied to the refrigeration-side heat storage evaporator 8 through the refrigeration-side heat storage solenoid valve 9 and the refrigeration-side heat storage expansion valve 10. Thereby, the excess refrigerating 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 is passed through the refrigeration-side supercooling refrigerant pipe 34a. It is supplied to the refrigeration side subcooling heat exchanger 31 in the inside and is cooled via the heat storage agent. Thereby, the refrigerant cooled to a lower temperature is supplied to the freezing side evaporator 25 from the freezing side solenoid valve 23 and the like. As described above, the cold stored in the heat storage agent in the heat storage tank 37 from the refrigeration side refrigerant circuit as the excess refrigeration capacity is consumed in the refrigeration side refrigerant circuit via the shared heat storage agent in the heat storage tank 37. Therefore, while the evaporation temperature of the refrigerant in the refrigeration-side evaporator 5 is high, that is, surplus cold heat is stored in the refrigeration-side refrigerant circuit with high operation efficiency, this cold heat is generated by the refrigerant in the refrigeration-side evaporator 25. Low evaporation temperature,
That is, since it is used in the refrigeration-side refrigerant circuit with low operation efficiency, the overall refrigeration efficiency of the entire equipment including the refrigeration-side refrigerant circuit and the refrigeration-side refrigerant circuit can be improved. Further, since only one heat storage tank is required, the configuration of the heat storage tank can be simplified.

It should be noted that, in summary, the composite cooling according to this embodiment is
The medium circuit equipment has the following technical measures.
You. That is, the composite refrigerant circuit equipment according to the first embodiment.
Comprises a first compressor, a first condenser, a first throttle device, and
And the first evaporator for cooling the first environment to be cooled is sequentially annular.
And a first refrigerant circuit connected to the first refrigerant circuit.
And a throttle device for heat storage in parallel with the first throttle device and the first evaporator
Storage refrigerant circuit connected in order and heat storage heat exchanger
Maximum refrigeration of the first refrigerant circuit via the heat storage heat exchanger.
Corresponds to the difference between the capacity and the required refrigeration capacity of the first cooled environment
A heat storage tank containing a heat storage agent for storing the cooled cold;
A compressor, a second condenser, a second throttle device, and a first condenser.
Cooling a second cooled environment to be lower than the cooling environment
A second refrigerant circuit formed by sequentially connecting second evaporators in a ring shape.
A second condenser and a second evaporator of the second refrigerant circuit;
Between the heat storage agent in the heat storage tank and the second refrigerant
First cold heat having a heat exchanger for supplying cold heat to a circuit
And a supply circuit.

Embodiment 2 FIG. FIG. 2 is a configuration diagram showing a composite type refrigerant circuit equipment according to a second embodiment of the present invention. The configuration is almost the same as that of the first embodiment, except that the following components are provided. . In the refrigeration-side refrigerant circuit, reference numeral 42 denotes a pressure detector (an example of a first refrigeration capacity detection device) which is connected to the refrigerant pipe 6 on the suction side of the refrigeration-side compressor 1 and detects a suction pressure of refrigerant gas; A control device for performing a control operation based on the pressure detection value detected by the heater 42 is provided in the refrigerant pipe 15 and adjusts the flow rate of the refrigerant flowing into the refrigeration-side heat storage evaporator 8 based on the operation result of the control device 43. (A configuration including the flow control valve 44 and the control device 43 is an example of a first refrigerant flow control device). In the refrigeration-side refrigerant circuit, 26a is the refrigeration-side condenser 2
The refrigerant from step 2 is cooled by the heat exchanger for subcooling on the refrigeration side (
Exchanger) refrigerant pipe for bypassing and circulating 31;
Reference numeral 5 denotes a pressure detector (an example of a second refrigeration capacity detection device) which is connected to the refrigerant pipe on the suction side of the refrigeration-side compressor 21 and detects the suction pressure of the refrigerant gas, and 46 denotes the pressure detected by the pressure detector 45 A control device for performing a control operation based on the detected value, 57
Is a flow control valve provided in the refrigerant pipe 26a to adjust the flow rate of the refrigerant flowing into the refrigeration-side subcooling heat exchanger 31 based on the calculation result of the control device 46 (the flow control valve 57, the control device 46, the refrigerant pipe The configuration including 26a is an example of the second refrigerant flow control device).

Next, the operation of the combined refrigerant circuit equipment according to the second embodiment will be described. Note that the basic refrigeration cycle operation of each refrigerant circuit in the composite refrigerant circuit equipment is the same as that in the first embodiment. When the load on the environment to be cooled, that is, the refrigerating capacity given to the environment to be cooled changes, the corresponding physical quantity (pressure on the compressor suction side, temperature of the environment to be cooled, etc.) also changes. For example, when the load in the refrigeration-side refrigerant circuit decreases, the excess refrigeration capacity increases. Then, the pressure on the suction side of the refrigeration-side compressor 1 changes according to the surplus refrigeration capacity. The pressure at this time is detected by the pressure detector 42 and output to the control device 43 as a detected pressure value. Therefore, the control device 43 calculates the opening of the flow control valve 44 based on the detected pressure value, outputs the calculated opening to the flow control valve 44, and increases the opening. Thereby, the amount of the refrigerant liquid corresponding to the surplus refrigeration capacity is
The refrigerant is supplied to the refrigerating-side regenerative heat exchanger 8 through the refrigerating-side heat storing electromagnetic valve 9 and the refrigerating-side heat storing expansion valve 10, and the cold heat of the refrigerant liquid is stored in the heat storage agent in the heat storage tank 37. As described above, when the surplus capacity is large, the opening degree of the flow control valve 44 is increased to increase the amount of refrigerant flowing into the refrigeration-side cold storage heat exchanger 8, thereby increasing the cold storage capacity. vice versa,
For example, when the load on the refrigeration side refrigerant circuit increases and the surplus refrigeration capacity decreases, the opening degree of the flow control valve 44 is reduced to reduce the amount of refrigerant flowing into the refrigeration side regenerator 8. Thereby, the cold storage capacity can be reduced.
Thus, according to the composite refrigerant circuit equipment of the second embodiment,
According to the surplus refrigeration capacity, it is possible to efficiently store the amount of cold heat corresponding to the surplus refrigeration capacity. Therefore, since the refrigerating-side regenerative evaporator 8 is not excessively regeneratively stored, the refrigerating capacity provided to the refrigerating-side evaporator 5 placed in a showcase or the like does not become insufficient, and is stored in the showcase or the like. The temperature of the stored refrigerated food or the like is not raised to a temperature that is inconvenient for it.

On the other hand, in the refrigerating-side refrigerant circuit, efficient control can be performed similarly to the refrigerating-side refrigerant circuit. For example, when the load on the freezing-side refrigerant circuit is increased and the required refrigerating capacity is increased, the control unit 46 calculates and calculates the pressure based on the pressure detection value from the pressure detector 45.
According to the output opening degree command, the opening degree of the flow control 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 energy of the heat storage tank 37 is used in the refrigeration-side refrigerant circuit. Conversely, when the required refrigeration capacity decreases due to a decrease in the load, the opening of the flow control valve 57 is increased, and the amount of refrigerant bypassing the refrigeration-side subcooling heat exchanger 31 is increased. As described above, according to the combined refrigerant circuit equipment of the second embodiment, in accordance with the refrigeration capacity required in the refrigeration side refrigerant circuit, the amount of cold heat corresponding to the required refrigeration capacity is efficiently extracted from the heat storage agent. Can be. In this combined refrigerant circuit equipment, each refrigerant circuit may be independently controlled, or both refrigerant circuits may be simultaneously controlled depending on the amount of heat stored in the heat storage tank 37.

It should be noted that, in summary, the composite cooling according to the present embodiment
The medium circuit equipment has the following technical measures.
You. That is, the composite refrigerant circuit equipment according to the second embodiment.
A first refrigerant circuit, a heat storage refrigerant circuit, a heat storage tank,
Provided with a second refrigerant circuit and a first cold heat supply circuit
In the above, the refrigeration capacity given to the first cooled environment is
A first refrigeration capacity detection device for detecting a corresponding physical quantity;
Corresponds to the maximum refrigeration capacity of 1 refrigerant circuit and the detected physical quantity
Heat from the first refrigerant circuit based on the difference
Refrigerant flow for controlling the flow rate of refrigerant to the heat exchanger
And a quantity control device. Also, the second
Check the physical quantity corresponding to the refrigeration capacity given to the environment to be cooled.
A second refrigeration capacity detection device for detecting
Large refrigeration capacity and refrigeration capacity corresponding to the detected physical quantity
From the second refrigerant circuit to the cold heat supply heat exchanger based on the difference
A second refrigerant flow rate control device for controlling the flow rate of the refrigerant
It is provided with.

Embodiment 3 FIG. FIG. 3 is a configuration diagram showing a composite refrigerant circuit equipment according to Embodiment 3 of the present invention. The configuration is almost the same as that of Embodiments 1 and 2, except that the following components are provided. Different. In the refrigeration-side refrigerant circuit, 8a is a heat storage tank 3
7, a refrigeration-side heat storage evaporator (heat storage heat exchanger) for storing surplus cold heat of the refrigeration-side refrigerant circuit;
3a is a control device for performing a control operation based on the pressure detection value detected by the pressure detector 42, and 47 is a refrigeration-side heat storage evaporator 8a
A water pipe is connected to the heat storage tank 37 in an annular shape so as to pass through the pump. A pump 48 is provided in the water pipe 47 and circulates water in the heat storage tank 37 to the refrigeration-side heat storage evaporator 8a (the pump 48 and the water A configuration including a pipe 47 is an example of a first heat storage agent circulating device), and 49 is an inverter for controlling the rotation speed of the pump 48 based on the calculation result of the control device 43a. The configuration provided is an example of the first heat storage agent circulation amount control device). In the refrigeration-side refrigerant circuit, reference numeral 31a denotes a refrigeration-side supercooling heat exchanger (cold heat supply heat exchanger) which is provided outside the heat storage tank 37 and takes out cold heat to the refrigeration-side refrigerant circuit.
Is a control device for performing control calculation based on the pressure detection value detected by the pressure detector 45, and 50 is a refrigeration-side subcooling heat exchanger 31.
A water pipe 51 is connected to the heat storage tank 37 in an annular shape so as to pass through the water pipe 50. A pump 51 is provided in the water pipe 50 and circulates water in the heat storage tank 37 to the freezing-side subcooling heat exchanger 31a (the pump 51). Is an example of a second heat storage agent circulating device including the water pipe 50), and 52 is an inverter for controlling the rotation speed of the pump 51 based on the calculation result of the control device 46b (with the inverter 52 and the control unit). The configuration including the device 46b is an example of the second heat storage agent circulation amount control device).
Note that the basic operation of the refrigeration cycle of each refrigerant circuit in the combined refrigerant circuit equipment is the same as in the first and second embodiments.

Next, the operation of the combined refrigerant circuit equipment according to the third embodiment will be described. First, in the refrigeration-side refrigerant circuit, for example, when the load is reduced to generate an extra refrigeration capacity, the refrigerant corresponding to the extra refrigeration capacity is passed through the refrigeration-side heat storage solenoid valve 9 and the refrigeration-side heat storage expansion valve 10 to the refrigeration side. The heat is supplied to the heat storage evaporator (heat storage heat exchanger) 8a. The refrigerant exchanges heat with water flowing through a water pipe 47 in the refrigeration-side heat storage evaporator 8 a by a 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 excess refrigeration capacity, is
(First refrigeration capacity detection device) . Therefore, when the excess refrigeration capacity is large, the control device 43a controls the inverter 49 to increase the rotation speed of the pump 48 based on the detected pressure value. Thereby, by increasing the amount of water flowing through the refrigeration-side heat storage evaporator 8a,
The cold storage capacity is increased. Conversely, when the surplus refrigeration capacity is small, the number of water flowing through the refrigeration-side heat storage evaporator 8a is reduced by reducing the rotation speed of the pump 48,
The cold storage capacity is reduced. As described above, by controlling the amount of water circulating to the refrigeration-side heat storage evaporator 8a in accordance with the surplus refrigeration capacity, it is possible to efficiently store cold heat in an amount corresponding to the surplus refrigeration capacity. That is, as in the case of the second embodiment, since the refrigerating side heat storage evaporator 8a does not excessively store cold, the refrigerating capacity given to the refrigerating side evaporator 5 placed in a showcase or the like is insufficient. There is no need to raise the temperature of refrigerated food and the like stored in a showcase or the like to an inconvenient temperature.

On the other hand, in the refrigerating-side refrigerant circuit, for example, when the load on the refrigerating-side refrigerant circuit increases and the required refrigerating capacity increases, the pressure detector 45 (the second refrigerant)
Control device 46 based on the pressure detection value from the freezing ability detection device)
Based on the calculation result of b, the inverter 52 is controlled so as to increase the rotation speed of the pump 51. by this,
Refrigeration side [ cool storage] Subcooling heat exchanger (Cold heat supply heat exchange
By increasing the amount of water flowing through the device 31a, the amount of cold heat taken out to the freezing-side refrigerant circuit is increased. Conversely, when the required refrigerating capacity is reduced, the rotation speed of the pump 51 is reduced to reduce the amount of water flowing through the refrigerating-side [ cooling ] supercooling heat exchanger 31a, thereby extracting cold heat. The amount is reduced. Thus, by controlling the amount of water circulating to the refrigeration-side [heat-storage evaporator] subcooling heat exchanger 31a in accordance with the refrigeration capacity required in the refrigeration-side refrigerant circuit, the refrigeration capacity is equivalent to the required refrigeration capacity. A small amount of cold heat can be efficiently extracted from water and given to the refrigeration-side refrigerant circuit. In this combined type refrigerant circuit facility, each refrigerant circuit may be controlled independently, as in the case of the second embodiment, or both of the refrigerant circuits may be controlled depending on the amount of heat stored in the heat storage tank 37. It is also possible to control at the same time.

It should be noted that, in summary, the composite cooling according to the present embodiment
The medium circuit equipment has the following technical measures.
You. That is, the composite refrigerant circuit equipment according to the third embodiment.
A first refrigerant circuit, a heat storage refrigerant circuit, a heat storage tank,
Provided with a second refrigerant circuit and a first cold heat supply circuit
At the heat storage heat exchanger and the heat storage tank.
Heat storage heat exchanger by circulating the heat storage agent from the heat storage tank
Heat storage agent circulating device for providing a storage medium with a refrigerant from a first refrigerant
Between the cold storage heat exchanger and the heat storage tank.
Circulating the heat storage agent from the heat storage tank
A second heat storage agent circulating device for applying cold to the refrigerant of the heat exchanger.
It is provided. The composite type according to the third embodiment
In addition to the above, the refrigerant circuit equipment may provide the first environment to be cooled.
The first refrigeration for detecting a physical quantity corresponding to the obtained refrigeration capacity
And the maximum refrigeration capacity of the first refrigerant circuit.
Based on the difference from the refrigeration capacity
The second method for controlling the circulation amount of the heat storage agent by the first heat storage agent circulating device
And a heat storage agent circulation amount control device.
You. Furthermore, the refrigeration capacity given to the second cooled environment
A second refrigeration capacity detection device for detecting a corresponding physical quantity;
The maximum refrigeration capacity of the second refrigerant circuit and the detected physical quantity
A second heat storage agent circulating device based on a difference from the corresponding refrigeration capacity
Heat storage agent circulation amount control for controlling heat storage agent circulation amount
And a control device.

Embodiment 4 FIG. FIG. 4 is a configuration diagram showing a main part of a refrigeration-side refrigerant circuit in a combined-type refrigerant circuit facility according to Embodiment 4 of the present invention. still,
In the figure, the combined refrigerant circuit equipment has a plurality of refrigeration-side refrigerant circuits, and a basic refrigeration cycle circuit and a refrigeration-side refrigerant circuit of these refrigeration-side refrigerant circuits are not shown. These are almost the same as those of the third embodiment, for example. In the combined refrigerant circuit equipment according to the fourth embodiment, a plurality of refrigeration-side heat storage evaporators (heat storage heat exchangers) 8a and a plurality of refrigeration-side supercooling heat exchangers 11a are provided outside the heat storage tank 37. I have. Each of the refrigerating-side heat storage evaporators 8a is connected in parallel to a refrigerant pipe 6 (see FIG. 3) of a refrigerating-side refrigerant circuit of each system via a refrigerant pipe 15. Further, each of the refrigerating side subcooling heat exchangers 11a is also connected to the refrigerant pipe 6 of each system via the refrigerant pipe 14 (see FIG. 9; in this case, the necessary refrigerating side subcooling switching solenoid valves 12, 13 are not shown). Are connected in series. In addition, each refrigerating-side heat-storage evaporator 8a and each refrigerating-side subcooling heat exchanger 11a and the heat storage tank 37 are connected in a circulating manner in parallel via a water pipe 47a. In addition, 12
a is a refrigeration-side supercooling switching solenoid valve for intermittently controlling the supply of refrigerant to each refrigeration-side subcooling heat exchanger 11a.

Next, the operation of the combined refrigerant circuit equipment according to the fourth embodiment will be described. For example, when the load is reduced in a refrigeration side refrigerant circuit of a certain system, the refrigerant liquid corresponding to the excess refrigeration capacity evaporates for the refrigeration side heat storage through the refrigeration side heat storage solenoid valve 9 and the refrigeration side heat storage expansion valve 10 of the system. Is supplied to the vessel 8a. This refrigerant exchanges heat with water flowing through a water pipe 47a in each refrigeration-side heat storage heat exchanger 8a by a pump 48.
It is stored cold. Conversely, for example, when the load of a certain system increases and the refrigeration capacity becomes insufficient, the high-temperature, high-pressure refrigerant is supplied to the refrigeration-side Is supplied to the refrigeration-side subcooling heat exchanger 11a through the refrigerant pipe 14 of FIG. The refrigerant is cooled by exchanging heat with water flowing through a water pipe 47a in the refrigerating side supercooling heat exchanger 11a and the refrigerating side heat storage evaporator 8a of each system by driving the pump 48. Thereby, the cold stored in the water is extracted through the refrigeration-side subcooling heat exchanger 11a. In this case, even if there is a system in which the refrigeration capacity is excessive or a system in which the refrigeration capacity is insufficient, the excess or insufficiency of the refrigeration capacity in the refrigeration-side refrigerant circuit of each system is caused by the heat exchange for refrigeration-side supercooling of each system. Water pipe 4 common to the heater 11a and the refrigeration-side heat storage evaporator 8a
Leveling is performed by exchanging cold heat through the water flowing through 7a. That is, the variation in the operating rate of the compressor for each system is also leveled. Therefore, the refrigeration efficiency can be improved as a whole of the combined refrigerant circuit equipment that performs refrigeration for a plurality of refrigeration-side refrigerant circuits. In the fourth embodiment, an example is shown in which a plurality of refrigeration-side refrigerant circuits are provided. However, it is needless to say that the present invention can be applied to a case in which a plurality of refrigeration-side refrigerant circuits are provided. Furthermore, the present invention can also be applied to a system in which a plurality of refrigeration-side refrigerant circuits and a plurality of refrigeration-side circuits are provided. In this case, the water pipe connected to the heat storage tank 37 is connected to the refrigeration side (corresponding to the water pipe 47a). By making the equipment common, the efficiency of the entire equipment can be improved.

Embodiment 5 FIG. FIG. 5 is a configuration diagram showing a refrigeration-side refrigerant circuit in a combined-type refrigerant circuit facility according to Embodiment 5 of the present invention. Note that the same reference numerals are given to the same components as those of the embodiments described above, and the description thereof will be omitted. In the figure, 8b
Denotes a refrigeration-side heat storage evaporator (heat storage heat exchanger) for storing excess cold heat in the refrigeration-side refrigerant circuit in the heat storage tank 37. In particular, a part of a plurality (here, three rows) of refrigerant pipes 15 connected in parallel to the refrigerant pipes 6 of the refrigeration side refrigerant circuit are built in the refrigeration side heat storage evaporator 8b, respectively.
A water pipe 47b, which is disposed near the built-in refrigerant pipe 15 so as to be able to exchange heat, is connected to the heat storage tank 37 in a circulating manner. 43b is a pressure detector (first refrigeration capacity)
(Detection device) This is a control device for performing a control calculation based on the pressure detection value detected by 42 and controlling the opening and closing of the refrigeration-side heat storage solenoid valves 9 provided in each refrigerant pipe 15.

Next, the operation of the combined refrigerant circuit equipment according to the fifth embodiment will be described. For example, when the load is reduced in the refrigeration side refrigerant circuit, the refrigerant liquid corresponding to the excess refrigeration capacity is supplied to the refrigeration side heat storage evaporator 8b through each refrigeration side heat storage solenoid valve 9 and each refrigeration side heat storage expansion valve 10. Is done. The refrigerant exchanges heat with the water flowing through the water pipe 47b in the refrigeration-side heat storage evaporator 8b by the pump 48, whereby the heat of the refrigerant is stored in the heat storage tank 37. At this time, the pressure on the suction side of the refrigerating-side compressor 1, which changes corresponding to the excess refrigerating capacity, is detected by the pressure detector 42.
Therefore, when the surplus refrigeration capacity is large, the control device 4
3b, each refrigeration-side heat storage solenoid valve 9 is increased based on the detected pressure value so as to increase the number of refrigeration-side heat storage solenoid valves 9 to be opened.
Output an open / close signal. Thereby, the cold storage capacity is increased by increasing the total amount of refrigerant flowing through the refrigeration-side heat storage evaporator 8b. Conversely, when the surplus refrigeration capacity is small, the number of the refrigeration-side heat storage solenoid valves 9 to be opened is reduced to reduce the total amount of refrigerant flowing through the refrigeration-side heat storage evaporator 8b. Is reduced.
As described above, by controlling the flow rate of the refrigerant to the refrigeration-side heat storage evaporator 8b according to the surplus refrigeration capacity, it is possible to receive from the refrigerant an amount of cold heat corresponding to the surplus refrigeration capacity. In addition, the cold heat from the refrigerant is efficiently stored in the heat storage tank 37 by the water flowing through the water pipe 47b by driving the pump 48. As a result, there is no adverse effect on refrigerated food and the like stored in the showcase and the like,
The improvement of the temperature maintenance accuracy for these refrigerated foods and the like can be achieved as in the case of the third embodiment.
In the fifth embodiment, an example in which the excess cold heat from the refrigeration-side refrigerant circuit is stored is described. However, it is needless to say that the present invention can be applied to a configuration in which the refrigeration-side refrigerant circuit extracts the cold heat from the heat storage tank 37.

Embodiment 6 FIG. FIG. 6 is a configuration diagram showing a refrigeration-side refrigerant circuit in a combined-type refrigerant circuit facility according to Embodiment 6 of the present invention. Note that the same reference numerals are given to the same components as those of the embodiments described so far, and description thereof will be omitted. In the figure, 8c
Is a refrigeration-side switchable heat exchanger (heat exchanger for heat storage and supercooling) for storing excess cold heat in the refrigeration side refrigerant circuit in the heat storage tank 37 and supplying the cold heat of the heat storage tank 37 to the refrigeration side refrigerant circuit.
Heat exchanger) . The refrigeration-side switching heat exchanger 8c includes a part of a refrigeration-side heat storage refrigerant pipe 15 connected in parallel to the refrigeration-side refrigerant circuit refrigerant pipe 6. In particular, refrigeration-side subcooling is provided for the piping between the refrigeration-side heat storage expansion valve 10 and the refrigeration-side switching heat exchanger 8c on the refrigerant pipe 15 and the piping on the exit side of the refrigeration-side switching heat exchanger 8c. Refrigerant pipes 14 are branched and connected. This refrigerated side
A supercooling refrigerant pipe 14 and a refrigeration-side switching heat exchanger 8c;
Is an example of the second cold heat supply circuit.
Reference numeral 12b denotes a refrigeration-side switching solenoid valve for interrupting the flow of the refrigerant in the refrigerant pipe 15, and reference numerals 12 and 13 denote refrigeration-side supercooling switching electromagnetic valves.

Next, the operation of the combined refrigerant circuit equipment according to the sixth embodiment will be described. First, in the refrigeration-side refrigerant circuit, each refrigeration-side subcooling switching electromagnetic valve 12 and refrigeration-side switching electromagnetic valve 12b (one example of a circuit opening and closing device) are closed, and the refrigeration-side supercooling switching electromagnetic valve 13 (one example of a circuit opening and closing device) When the operation of the refrigeration cycle is started in a state where the refrigeration cycle is opened, the cooling of the showcase or the like is performed by the refrigeration-side evaporator 5. Then, when the load decreases and an excess refrigeration capacity is generated, a control device (not shown) (an example of a refrigerant flow control device)
Thereby, the refrigerating side switching electromagnetic valve 12b is opened. Thereby, 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 switching type heat exchanger 8c through the refrigeration side heat storage solenoid valve 9 and the refrigeration side heat storage expansion valve 10. By performing heat exchange with water flowing through the water pipe 47, excess cold heat is stored in the heat storage tank 37. That is, in this case, the refrigeration-side switching heat exchanger 8c functions as a refrigeration-side heat storage evaporator.

Conversely, when the load increases and exceeds the original maximum refrigerating capacity of the refrigeration side refrigerant circuit, each refrigeration side supercooling switching electromagnetic valve 12 is opened, and the refrigeration side supercooling switching electromagnetic valve 13 and the refrigeration side switching electromagnetic valve. Valve 12b is closed. Thereby, the refrigerant from the refrigeration-side condenser 2 flows into the refrigeration-side switching heat exchanger 8c through the refrigerant pipe 14 and flows into the water pipe 47 (the water pipe 4).
7 and a pump 48 constitute a first heat storage agent circulating device.
By being water heat exchange which flows through the that), the heat storage tank 3
After being cooled by receiving the cold of 7, it is led to the refrigeration evaporator 5. That is, in this case, the refrigeration-side switching heat exchanger 8c is
Functions as a heat exchanger for subcooling on the refrigeration side. At this time, depending on the relative relationship between the refrigeration capacity controllable range of the refrigeration side expansion valve 4, the heat exchange capacity of the refrigeration side evaporator 5, and the load amount, the refrigerant is not completely vaporized in the refrigeration side evaporator 5 without being evaporated. In some cases, it may be in an inconvenient state such as being sucked into the refrigeration-side compressor 1. In such a state, the control device 43a calculates and detects this state based on the pressure detection value from the pressure detector 42 (first refrigeration capacity detection device) , and according to the detection result, the inverter 49 ( This inva
The first heat storage agent circulation amount is controlled by the heater 49 and the controller 43a.
Control unit) and the pump 48 to control the amount of water circulating to the refrigerating-side switching heat exchanger 8c. Thereby, the supercooling capacity of the refrigerant in the refrigeration-side switching heat exchanger 8c is adjusted. As a result, it is possible to avoid such a disadvantage that the refrigerant is sucked into the refrigeration compressor 1 in a liquid state. As described above, according to the combined refrigerant circuit equipment according to this embodiment, the function of the refrigeration-side switching heat exchanger 8c is changed according to the load amount, and the function of the heat storage evaporator and the function of the supercooling heat exchanger are changed. Since the function can be switched to the function, one refrigeration-side switching heat exchanger 8c can be shared as the heat storage evaporator and the supercooling heat exchanger. Therefore, the manufacturing cost of the initials related to the heat exchanger can be reduced. In addition, since the amount of supercooling is controlled in accordance with the operation state while detecting the operation state at the time of supercooling, it is possible to prevent the refrigerant from returning to the refrigeration-side compressor 1 in a liquid state, and Reliability is improved. In the sixth embodiment, an example relating to the refrigeration side refrigerant circuit is shown, but such a configuration can naturally be applied to the refrigeration side refrigerant circuit.

Embodiment 7 FIG. FIG. 7 is a configuration diagram showing a refrigeration-side refrigerant circuit in a combined-type refrigerant circuit facility according to Embodiment 7 of the present invention. Note that the same reference numerals are given to the same components as those of the embodiments described so far, and description thereof will be omitted. In the figure, 53
Is a temperature detector (an example of a heat storage amount detection device) that is disposed in the heat storage tank 37 and detects the temperature of water in the heat storage tank 37. Reference numeral 54 denotes each refrigeration-side subcooling switch based on a detection signal from the temperature detector 53. This is a control device (an example of a refrigerant flow path control device) that controls opening and closing of the electromagnetic valve 12, the refrigeration-side supercooling switching electromagnetic valve 13, and the refrigeration-side switching electromagnetic valve 12b.

Next, the operation of the combined 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, in particular, when the amount of cold storage in the heat storage tank 37 is too small, for example, when the refrigeration capacity is required in the refrigeration-side refrigerant circuit, the necessary refrigerant cannot be sufficiently cooled at this time. Therefore, for example, when the minimum amount of cold storage in the heat storage tank 37 is determined in advance, and when the amount of cold storage in the heat storage tank 37 is lower than the amount of cold storage corresponding to the minimum amount of cold storage and there is room in the refrigerating capacity of the refrigeration-side refrigerant circuit, The controller 54 closes each refrigeration-side supercooling switching electromagnetic valve 12 and opens the refrigeration-side supercooling switching electromagnetic valve 13 and the refrigeration-side switching electromagnetic valve 12b. Thereby, the refrigeration-side switching heat exchanger 8
c is a heat storage evaporator (heat storage heat exchange ) by the heat storage refrigerant circuit.
Acts as a vessel), an excess of cold in cold-side refrigerant circuit first
Is stored in the heat storage tank 37 via a water pipe 47 and a pump 48 as a heat storage agent circulating device .

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 refrigeration-side supercooling switching electromagnetic valve 12 and sets the refrigeration-side supercooling switching electromagnetic valve. The valve 13 and the refrigeration-side switching electromagnetic valve 12b are closed. As a result, the refrigeration-side switching heat exchanger 8c functions as a supercooling heat exchanger for extracting cold heat,
The heat of the heat storage tank 37 is supplied to the refrigerant in the cooling pipe 14 of the second cold heat supply circuit via the water pipe 47 and the pump 48 as the first heat storage agent circulating device . The refrigerant thus cooled is sequentially supplied to the refrigeration-side electromagnetic valve 3, the refrigeration-side expansion valve 4, and the refrigeration-side evaporator 5, thereby replenishing the refrigeration capacity required in the refrigeration-side refrigerant circuit. As described above, according to the combined refrigerant circuit equipment according to this embodiment, the function of the refrigerating-side switching heat exchanger 8c is changed to the function of the heat storage evaporator and the function of the supercooling heat in accordance with the amount of cold storage in the heat storage tank 37. Since it can be switched to the function of an exchanger, one refrigeration-side switching heat exchanger 8c can be switchably used as a heat storage evaporator or a supercooling heat exchanger. Therefore, the manufacturing cost of the initials related to the heat exchanger can be reduced.

It should be noted that, in summary, the composite cooling according to this embodiment
The medium circuit equipment has the following technical measures.
You. That is, the composite refrigerant circuit equipment according to the seventh embodiment.
A first refrigerant circuit, a heat storage refrigerant circuit, a heat storage tank,
Provided with a second refrigerant circuit and a first cold heat supply circuit
, The first condenser and the first throttle of the first refrigerant circuit
It is connected in series with the device and can open and close the flow path.
A circuit opening / closing device for storing the refrigerant from the first condenser;
The heat of the heat storage agent in the heat storage tank is bypassed to the heat exchanger for heat and
A second cold heat supply circuit for supplying the refrigerant circuit of
A heat storage amount detection device for detecting the heat storage amount of the heat storage agent;
Open / close the circuit switch based on the detected heat storage to cool
The medium flow path is connected to the heat storage refrigerant circuit and the second cold heat supply circuit.
And a refrigerant flow control device to be replaced.
You.

Embodiment 8 FIG. FIG. 8 is a configuration diagram showing a combined refrigerant circuit equipment according to Embodiment 8 of the present invention. In the drawings, the same reference numerals are given to the same components as those of the embodiments described above, 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 first embodiment shown in FIG.
A heat exchanger for subcooling on the refrigeration side that also has the function of a condenser on the refrigeration side
(Heat exchanger for supplying cold heat) 31a was provided in the heat storage tank 37 instead of the heat exchanger 31 for supercooling on the refrigeration side (see FIG. 1) . 2
Configuration is omitted condenser) (see FIG. 1) it is that was taken.

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

It should be noted that, in summary, the composite cooling according to the present embodiment
The medium circuit equipment has the following technical measures.
You. That is, the composite refrigerant circuit equipment according to the eighth embodiment.
Comprises a first compressor, a first condenser, a first throttle device, and
And the first evaporator for cooling the first environment to be cooled is sequentially annular.
And a first refrigerant circuit connected to the first refrigerant circuit.
And a throttle device for heat storage in parallel with the first throttle device and the first evaporator
Storage refrigerant circuit connected in order and heat storage heat exchanger
Maximum refrigeration of the first refrigerant circuit via the heat storage heat exchanger.
Corresponds to the difference between the capacity and the required refrigeration capacity of the first cooled environment
A heat storage tank containing a heat storage agent for storing the cooled cold;
A compressor, a second condenser, a second throttle device, and a first condenser.
Cooling a second cooled environment to be lower than the cooling environment
A second refrigerant circuit formed by sequentially connecting second evaporators in a ring shape.
In the combined refrigerant circuit equipment with
Can supply cold heat from the heat storage agent to the second refrigerant circuit
It is characterized by being provided in a heat storage tank.

[0064]

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

Excessive cold heat from the high-cooling-temperature-side (first) refrigerant circuit having high refrigeration efficiency is transferred to the heat storage tank between a plurality of refrigerant circuits for cooling a plurality of cooled environments having different cooling temperatures. Since the refrigerant is moved to the low cooling temperature side (second) refrigerant circuit having a low refrigeration efficiency via the agent, the overall refrigeration efficiency can be improved as a whole facility.

Further, according to the excess amount of cold heat in the refrigerant circuit on the high cooling temperature side (first) (corresponding to the physical quantity such as the inlet pressure of the (first) compressor and the temperature of the environment to be cooled), Since the amount of refrigerant flowing from the first refrigerant circuit to the heat exchanger is controlled, it is possible to control the amount of heat storage of excess cold heat.
Therefore, for example, since the cold storage heat exchanger is not excessively stored, the shortage of the refrigerating capacity provided to the refrigeration-side evaporator placed in the first cooled environment does not occur, and the first cooled storage evaporator does not. It is not necessary to raise the cooling environment to a temperature which is inconvenient for it.

On the other hand, depending on the insufficient refrigerating capacity of the refrigerant circuit on the low cooling temperature side (second) (corresponding to physical quantities such as the inlet pressure of the (second) compressor and the temperature of the environment 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 forcibly circulated toward each of the heat storage heat exchanger and the cold heat supply heat exchanger for transferring cold heat into and out of the heat storage agent, The movement efficiency can be improved.

The amount of circulation of the heat storage agent from the heat storage tank to the heat storage heat exchanger is controlled according to the amount of surplus cold heat in the first refrigerant circuit. Can be controlled.

Conversely, the circulation amount of the heat storage agent from the heat storage tank to the heat exchanger for supplying cold heat is controlled according to the refrigeration capacity that is insufficient in the second refrigerant circuit. It is possible to control the amount of funding.

Further, one heat storage heat exchanger connected to the first refrigerant circuit can be rationally used as a heat storage evaporator or a supercooling heat exchanger according to the heat storage amount of the heat storage agent. Since the heat exchangers are selectively used, the manufacturing cost of the initials required 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 exchange heat, the cold stored in the heat storage tank can be used efficiently. In addition, since the second condenser is also used as the original condenser and the heat exchanger for supercooling, it is possible to reduce the manufacturing cost of the initials required for the heat exchanger.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a complex-type refrigerant circuit facility according to Embodiment 1 of the present invention.

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

FIG. 3 is a configuration diagram showing a complex-type refrigerant circuit facility according to Embodiment 3 of the present invention.

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

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

FIG. 6 is a configuration diagram illustrating a refrigeration-side refrigerant circuit in a combined-type 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 combined-type refrigerant circuit facility according to Embodiment 7 of the present invention.

FIG. 8 is a configuration diagram showing a complex type refrigerant circuit equipment according to Embodiment 8 of the present invention.

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

[Description of Signs] 1 Refrigeration-side compressor (first compressor) 2 Refrigeration-side condenser (first condenser) 3 Refrigeration-side solenoid valve 4 Refrigeration-side expansion valve (first throttle device) 5 Refrigeration-side evaporation (First evaporator) 6 Refrigerant piping 8 Refrigeration-side heat storage evaporator (heat storage heat exchanger) 8a Refrigeration-side heat storage evaporator (heat storage heat exchanger) 8b Refrigeration-side heat storage evaporator (heat storage heat) exchanger) 8c refrigerating side switching type heat exchanger (heat storing heat exchanger) 9 refrigerating side heat storage electromagnetic valve 10 refrigerating side heat storage expansion valve (throttle heat storage device) 12 refrigerating side subcooling switching solenoid valve 12b refrigerating side switching Solenoid valve 13 Refrigeration-side supercooling switching electromagnetic valve 14 Refrigerant pipe 15 Refrigerant pipe 21 Refrigeration-side compressor (second compressor) 22 Refrigeration-side condenser (second condenser) 23 Refrigeration-side electromagnetic valve 24 Refrigeration-side expansion valve (Second throttle device) 25 Freezing side evaporator (second evaporator) 26 Refrigerant pipe 26a Refrigerant pipe 31 Freezing-side supercooling heat exchanger (cold heat supply heat exchanger) 31a Freezing-side supercooling heat exchanger (cold heat supply heat exchange)
Vessel) 34a refrigerant pipe 37 heat storage tank 42 pressure detector (first refrigeration capacity detecting device) 43 control device (first refrigerant flow amount control device) 43a controller 43b control device 44 flow regulating valve 45 pressure detector (No. 2 refrigeration capacity detection device) 46 control device (second refrigerant flow control device) 46b control device 47 water pipe 47b water pipe 48 pump (first heat storage agent circulation device) 49 inverter 50 water pipe 51 pump (second) 52 ) Inverter 53 Temperature detector 54 Control device 57 Flow control valve

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatake Ikeuchi 6-66, Tehira, Wakayama City Mitsubishi Electric Corporation Wakayama Works (72) Inventor Koichi Negoro 6-5-66, Tehira Wakayama City Mitsubishi Electric (72) Inventor Koichi Ohata 2-2-2 Dojima, Kita-ku, Osaka City Mitsubishi Electric Corporation Kansai Branch Office (72) Inventor Tadaaki Nakano 2-2-2, Dojima, Kita-ku, Osaka Mitsubishi Electric Corporation Kansai Branch Office (56) References JP-A-64-6650 (JP, A) JP-A-2-251051 (JP, A) JP-A-3-255852 (JP, A) JP-A 64-64 90962 (JP, A) JP-A-5-52435 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 5/00 F25B 1/00 321

Claims (14)

(57) [Claims] 1. One or more systems 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 a ring shape . A first refrigerant circuit, a heat storage refrigerant circuit in which the first compressor, the first condenser, the heat storage expansion device and the heat storage heat exchanger are sequentially connected, and the heat storage heat exchanger. Provided between the heat storage tank
The heat storage agent in the heat storage tank is circulated to the heat storage heat exchanger.
A first storage unit for exchanging heat with the refrigerant of the heat storage refrigerant circuit.
A heating agent circulating device, a heat storage tank containing a heat storage agent for storing cold heat through the heat storage heat exchanger by the heat storage refrigerant circuit , a second compressor, a second condenser, and a heat storage tank. From heat storage agent
The first cooling device having a cold heat supply heat exchanger for supplying cold heat
A heat supply circuit , a second expansion device, and a second cooling device for cooling a second cooled environment to be lower in temperature than the first cooled environment.
Composite refrigerant circuit equipment, characterized in that in that a second refrigerant circuit of the evaporator successively formed by connecting in a ring one or more systems. 2. A multi-system system comprising a first compressor, a first condenser, a first expansion device, and a first evaporator for cooling a first environment to be cooled, which are sequentially connected in a ring shape. A first refrigerant circuit, a heat storage tank containing a heat storage material, and a plurality of heat storage refrigerants sequentially connected to the first compressor, the first condenser, the heat storage expansion device, and the heat storage heat exchanger. Circuit, the first condenser and the first throttle device of the first refrigerant circuit
Sub-cooling heat exchangers connected to the
And the heat storage agent in the heat storage tank is circulated in parallel to the heat storage heat exchanger.
And heat exchange with the refrigerant in the heat storage refrigerant circuit.
Then, the heat storage agent in the heat storage tank is circulated in parallel to the supercooling heat exchanger.
The heat storage agent in the heat storage tank is circulated to the refrigerant from the first condenser.
From the first heat storage agent circulating device for supplying the cold heat of the second compressor, the second condenser, and the heat storage agent in the heat storage tank.
The first cooling device having a cold heat supply heat exchanger for supplying cold heat
A heat supply circuit , a second expansion device, and a second cooling device for cooling a second cooled environment to be lower in temperature than the first cooled environment.
Composite refrigerant circuit equipment, characterized in that in that a second refrigerant circuit of the evaporator successively formed by connecting in a ring one or more systems. 3. One or more systems 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 a ring shape. A first refrigerant circuit, the first compressor, the first condenser, the heat storage throttle device, and the heat storage heat exchanger are sequentially connected to each other and are opened and closed.
1 or more and the thermal storage refrigerant circuit, a heat storage tank that houses a heat storage agent to cold storage cold heat through the thermal storage heat exchanger by the heat accumulating refrigerant circuit, said first condenser of the first refrigerant circuit And the first drawer
Open / close control by connecting the heat storage heat exchanger between the
From the at least one second cold heat supply circuit, the second compressor, the second condenser, and the heat storage agent in the heat storage tank.
The first cooling device having a cold heat supply heat exchanger for supplying cold heat
A heat supply circuit , a second expansion device, and a second cooling device for cooling a second cooled environment to be lower in temperature than the first cooled environment.
Composite refrigerant circuit equipment, characterized in that in that a second refrigerant circuit of the evaporator successively formed by connecting in a ring one or more systems. 4. A heat exchanger for storing heat in the heat storage tank.
Heat exchange with the refrigerant in the heat storage refrigerant circuit
Or the refrigerant from the first condenser in the heat storage tank
Provided with a first heat storage agent circulating device for supplying cold heat of the heat storage agent
The composite refrigerant circuit equipment according to claim 3, wherein: 5. A method for detecting a refrigerating capacity of the first refrigerant circuit.
A first refrigeration capacity detection device, and the first refrigeration capacity detection device based on an output of the first refrigeration capacity detection device.
Heat storage for controlling the flow rate of the refrigerant in the heat storage agent circulation device of the first embodiment
Claims, characterized in that a material circulation quantity control device
5. The composite refrigerant circuit equipment according to 1, 2, or 4 . 6. The apparatus according to claim 1, wherein
Refrigeration capacity given to the first cooled environment is detected, and the first refrigerant is controlled by the first heat storage agent circulation amount control device.
The difference between the maximum refrigeration capacity of the circuit and the detected refrigeration capacity
Circulation of the heat storage agent by the first heat storage agent circulating device based on the
The composite type according to claim 5, wherein the amount is controlled.
Refrigerant circuit equipment . 7. The amount of heat stored in the heat storage agent in the heat storage tank is detected.
A heat storage amount detection device, and the heat storage refrigerant circuit based on an output of the heat storage amount detection device.
Refrigerant flow for controlling the opening and closing of the passage and the second cold heat supply circuit
A road control device is provided.
The combined refrigerant circuit equipment described in the above . 8. One or more systems 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 a ring shape . A first refrigerant circuit, a heat storage refrigerant circuit in which the first compressor, the first condenser, a heat storage expansion device, and a heat storage heat exchanger are sequentially connected; and the heat storage refrigerant circuit A heat storage tank containing a heat storage agent that stores cold heat through a heat storage heat exchanger; a second compressor, a second condenser, and the heat storage tank.
Cold supply heat for supplying cold from the heat storage agent in the heat storage tank
A first cold heat supply circuit having an exchanger, a second expansion device,
And one or more second refrigerant circuits sequentially connected in a ring shape with a second evaporator for cooling a second cooled environment that is cooled to a temperature lower than the first cooled environment, and The said
In parallel with the first cold supply circuit, the second condenser
A bypass for controllably diverting the refrigerant to the second expansion device
A composite refrigerant circuit equipment comprising a circuit . 9. A method for detecting a refrigerating capacity of the second refrigerant circuit.
A second refrigeration capacity detection device based on the output of the second refrigeration capacity detection device.
Refrigerant flow for controlling the amount of refrigerant flowing through the cold heat supply circuit
9. The apparatus according to claim 8, further comprising a traffic control device.
Complex refrigerant circuit equipment described above . 10. The apparatus according to claim 1, wherein
The refrigeration capacity given to the second environment to be cooled is detected, and the second refrigerant circulation control device detects the refrigeration capacity.
Based on the difference between the maximum refrigeration capacity of the road and the detected refrigeration capacity.
Controlling the flow rate of the refrigerant in the first cold heat supply circuit.
10. The composite refrigerant circuit according to claim 9, wherein:
Equipment . 11. One or more systems 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 a ring shape . A first refrigerant circuit, a heat storage refrigerant circuit in which the first compressor, the first condenser, a heat storage expansion device, and a heat storage heat exchanger are sequentially connected; and the heat storage refrigerant circuit A heat storage tank containing a heat storage agent for storing cold heat through a heat storage heat exchanger; a second compressor, a second condenser, and a heat storage agent in the heat storage tank.
The first cooling device having a cold heat supply heat exchanger for supplying cold heat
A heat supply circuit , a second expansion device, and a second cooling device for cooling a second cooled environment to be lower in temperature than the first cooled environment.
And at least one second refrigerant circuit in which the evaporators are sequentially connected in a ring, and the second refrigerant circuit is interposed between the cold heat supply heat exchanger and the heat storage tank.
The heat storage agent from the heat storage tank is
Circulates through the heat exchanger and exchanges heat with the refrigerant in the second refrigerant circuit.
A second heat storage agent circulating device, and a second refrigeration capacity for detecting a refrigeration capacity of the second refrigerant circuit.
Force detecting device and the second refrigeration capacity detecting device
Heat storage for controlling the flow rate of the refrigerant in the heat storage agent circulating device of the present invention
Combined refrigeration characterized by comprising an agent circulation amount control device
Medium circuit equipment . 12. The apparatus according to claim 1, wherein
Detecting the refrigeration capacity given to the second environment to be cooled, and controlling the second refrigerant by the second heat storage agent circulation amount control device;
The difference between the maximum refrigeration capacity of the circuit and the detected refrigeration capacity
Of the heat storage agent by the second heat storage agent circulating device based on the
The composite of claim 11, wherein the amount is controlled.
Type refrigerant circuit equipment . 13. The first compressor, the first condenser, the first compressor,
Expansion device, and first evaporation for cooling the first cooled environment
One or more first refrigerant circuits formed by sequentially connecting the
Path, the first compressor, the first condenser, and a heat storage throttle device
Storage refrigerant circuit connected in order and heat storage heat exchanger
When, through the thermal storage heat exchanger by the heat accumulating refrigerant circuit
A heat storage tank containing a heat storage agent for storing cold heat, a second compressor, and cold heat supplied from the heat storage agent in the heat storage tank.
A first cold heat supply circuit having a cold heat supply heat exchanger,
And a lower temperature than the first cooled environment.
The second evaporator for cooling the second environment to be cooled
And one or more second refrigerant circuits connected in a ring.
The heat exchanger for supplying cold heat is connected to a condenser of the second refrigerant circuit.
Composite refrigerant circuit, characterized by functioning as
Equipment . 14. A first evaporation in the first refrigerant circuit.
The refrigerant evaporating temperature of the vessel is the second in the second refrigerant circuit.
It is set higher than the refrigerant evaporation temperature of the evaporator.
A composite refrigerant circuit according to any one of claims 1 to 13.
Equipment .