JP2000111190A - Cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cooler excellent in energy saving performance by providing first and second forced refrigerant circulating circuits and first and second natural refrigerant circulating circuits thereby saving power consumption of a compressor significantly. SOLUTION: In a first forced refrigerant circulating circuit, refrigerant liquid liquefied by a condenser 2 absorbs heat through a first evaporator 4 to cool the air in an indoor unit 24. When the outer air temperature is sufficiently lower than the room temperature in a second natural refrigerant circulating circuit, refrigerant gas vaporized by a natural circulation evaporator 12 ascends through a refrigerant ascend pipe 35 because of the difference of specific gravity before being liquefied in a natural circulation condenser 10 by discharging heat to the outer air. Liquefied refrigerant descends through a refrigerant descend pipe 36 through action of gravity and absorbs heat at the natural circulation evaporator 12. In a first natural circulation circuit, ice in a cold storage tank 22 is employed as a heat source for condensing refrigerant of a first natural circulation condenser 17. In a second forced refrigerant circulating circuit, ice is produced in the cold storage tank 22 using a second evaporator 7 in the nighttime when the electric rate is low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device that can reduce the power consumption of a compressor incorporated in a refrigeration cycle.

[0002]

2. Description of the Related Art FIG. 2 is a schematic configuration diagram of a cooling device (Japanese Patent Laid-Open No. 9-68355) incorporating a refrigerant natural circulation circuit. The cooling device is driven by an external power source and adiabatically compresses the refrigerant gas into a superheated refrigerant gas, and radiates the superheated refrigerant gas to the outside air. A condenser 2 composed of a heat exchanger such as a fin coil that uses the refrigerant liquid as a refrigerant liquid; an expansion valve 3 that adiabatically expands the refrigerant liquid liquefied by the condenser 2 to produce a two-phase refrigerant in a gas-liquid mixed state; The evaporator 4 that absorbs the heat of vaporization when the refrigerant liquid becomes the refrigerant gas from the object to be cooled, and the refrigerant gas that comes out of the evaporator 4 that is constituted by a heat exchanger such as a fin coil is temporarily stored. A suction accumulator 5 which is a container which plays a role of buffering in the event of a transient operation phenomenon or an excessive amount of refrigerant charging, and a refrigerant gas from the evaporator 4 bypassing the suction accumulator 5 and the compressor 1 are discharged from the condenser 2.
And a refrigerant flow switching valve 40 attached to a refrigerant riser pipe 32 which can flow directly to the refrigerant. In this cooling device in which the radiation target is the atmosphere and the cooling target is room air, the outdoor unit 21 includes the compressor 1, the condenser 2, the suction accumulator 5, and the refrigerant flow switching valve 40, and the expansion valve 3 and the evaporator 4 Are included in the indoor unitite 24. The positional relationship between the outdoor unit 21 and the indoor unit 24 is such that the outdoor unit 21 is installed at a position higher than the indoor unit 24.

There are two cooling operation modes in the operation of this cooling device. One is a cooling operation mode in a general refrigeration cycle in which the outside air temperature is higher than the temperature of indoor air as in summer. In the cooling operation mode, the refrigerant flow switching valve 40 is operated in a closed state.

[0004] Another operation mode is a cooling operation mode in which the outside air temperature is lower than the temperature of the indoor air as in winter,
This is called a refrigerant natural circulation mode. In the case of the refrigerant natural circulation mode, the refrigerant flow switching valve 40 is open, and the evaporator 4 and the condenser 2 are directly connected by the refrigerant rising pipe 32,
The suction accumulator 5 and the compressor 1 do not intervene on the way. In this case, the refrigerant gas having a substantially room temperature that has flowed into the condenser 2 radiates heat to the outside air, condenses, and flows out as a refrigerant liquid. That is, the refrigerant gas is liquefied in the condenser 2, the refrigerant liquid becomes the refrigerant gas in the evaporator 4, and the pressure of the refrigerant gas is higher on the evaporator 4 side and lower on the condenser 2 side. Therefore, a pressure gradient of the refrigerant gas is generated in the refrigerant rise pipe 32, whereby the refrigerant gas rises from the evaporator 4 to the condenser 2 by natural convection. On the other hand, the refrigerant liquid flowing out of the condenser 2 descends through the refrigerant downcomer pipe 31 by the action of gravity and naturally descends to the evaporator 4. That is, even if the compressor 1 is not driven, the refrigerant rises through the refrigerant riser tube 32 and descends through the refrigerant descender tube 31 to move the condenser 2
And evaporator 4.

[0005] The cooling in the refrigerant natural circulation mode is based on the principle of a heat pipe (here, the temperature difference and height difference between the condenser 2 and the evaporator 4 and the phase change due to the temperature and pressure of the refrigerant). In addition, the cooling effect can be obtained only in a situation where the indoor / outdoor temperature difference is sufficient. Therefore, when the outside air temperature becomes equal to or higher than the room temperature, the compressor 1 must be operated to perform the above-described cooling operation mode in the refrigeration cycle.

FIG. 3 is an example of a schematic configuration diagram of a cooling apparatus using both a forced circulation cooling system using ice cold storage and a refrigeration cycle for driving a compressor. This cooling device is driven by an external power source and adiabatically compresses a refrigerant gas into a superheated refrigerant gas by adiabatically compressing the refrigerant gas, and radiates the superheated refrigerant gas in the compressor 1 to an external medium. A condenser 2 that converts the refrigerant liquid liquefied by the condenser 2 into a two-phase refrigerant in a gas-liquid mixed state by adiabatic expansion, and a heat of vaporization when the refrigerant liquid becomes a refrigerant gas. Evaporator 4 that absorbs heat from the object to be cooled, and a container that temporarily accumulates the refrigerant gas discharged from the evaporator 4 and serves as a buffer in the event of a transient operation phenomenon or an excessive amount of refrigerant encapsulation. A suction accumulator 5 and an expansion valve 6 that adiabatically expands the refrigerant liquid liquefied in the condenser 2 to produce a two-phase refrigerant in a gas-liquid mixed state.
A heat exchanger 27 that absorbs heat of vaporization when the two-phase refrigerant that has exited from the expansion valve 6 becomes refrigerant gas from the object to be cooled (water);
In the reverse cycle operation in which the heat exchanger 27 is incorporated and the water to be cooled is stored in the cold storage tank 22 and the heat exchanger 27 is used as the condenser 2, the refrigerant liquid liquefied in the condenser 2 is adiabatically expanded. An evaporator 12 connected to an expansion valve 11 which is a two-phase refrigerant in a gas-liquid mixed state, and temporarily stores refrigerant gas discharged from the evaporator 12 to prevent an excessive operation phenomenon or an excessive refrigerant encapsulation amount. A suction accumulator 18 which is a container serving as a buffer, a refrigerant gas pump 19 for ensuring a flow of refrigerant circulation, refrigerant flow switching valves 28 and 29 for bypassing between the evaporator 4 and the evaporator 12, A refrigerant flow switching valve 9 that bypasses the suction accumulator 18 and the refrigerant gas pump 19 and a check valve 20 that is mounted in parallel with the expansion valve 6 are provided.

[0007] There are four operation modes for the operation of this cooling device. The first operation mode is a cold storage operation mode,
In this cold storage operation mode, the refrigerant flow switching valves 28, 9, 2
9 is opened, the refrigerant gas that has been overheated in the compressor 1 is liquefied in the condenser 2, passes through the refrigerant pipe 31, the refrigerant flow switching valve 28, and the refrigerant pipe 36, is adiabatically expanded by the expansion valve 6, and is gas-liquid mixed. It becomes a two-phase refrigerant in a state. Thereafter, ice is generated by absorbing heat of vaporization when the refrigerant liquid becomes refrigerant gas in the heat exchanger 27 from water in the cold storage tank 22 which is the object to be cooled, thereby performing cold storage. In this cool storage operation mode, the heat exchanger 27 plays the role of an evaporator. The refrigerant gas vaporized in the heat exchanger 27 passes through the refrigerant flow switching valve 9, the refrigerant pipe 35, and the refrigerant flow switching valve 29, is collected by the suction accumulator 5, and returns to the compressor 1.

The second operation mode is a heat radiation operation mode. In this heat radiation operation mode, the refrigerant flow switching valves 28, 2
9 is closed, the refrigerant flow switching valve 9 is opened, and the refrigerant gas is sucked from the suction accumulator 18 by the refrigerant gas pump 19 and sent to the heat exchanger 27. In this operation mode, the heat exchanger 27 radiates heat to the ice stored in the cold storage tank 22 and functions as a condenser for liquefying the refrigerant gas. The refrigerant liquid liquefied in the heat exchanger 27 is:
The gas reaches the expansion valve 11 through the check valve 20 and the refrigerant pipe 36. The refrigerant liquid passes through the expansion valve 11 and is adiabatically expanded to become a gas-liquid mixed two-phase refrigerant. The evaporator 12 performs cooling by absorbing heat of vaporization from the object to be cooled. The refrigerant gas gasified again by the evaporator 12 is stored in the suction accumulator 18 through the refrigerant pipe 35, sent to the heat exchanger 27 by the refrigerant gas pump 19, and the heat radiation operation is continued.

The third operation mode is a cooling operation mode using the compressor 1. In this cooling operation mode, the refrigerant gas which has been overheated by the compressor 1 is closed by closing the refrigerant flow switching valves 28 and 29. Liquefied by the condenser 2 and the refrigerant pipe 31
And is adiabatically expanded by the expansion valve 3 to become a two-phase refrigerant in a gas-liquid mixed state. Thereafter, the evaporator 4 performs cooling operation by absorbing the heat of vaporization when the refrigerant liquid becomes the refrigerant gas from the object to be cooled. The refrigerant gas vaporized in the evaporator 4 is collected in the suction accumulator 5 and returned to the compressor 1 again, and the cooling operation is continued.

The fourth operation mode is an operation mode in which the heat dissipation operation mode as the second operation mode and the cooling operation mode as the third operation mode are simultaneously performed. Large cooling capacity can be obtained, and it can cope with high load.

[0011]

The conventional cooling device described with reference to FIG. 2 uses the principle of the heat pipe in the refrigerant natural circulation mode (here, the condenser 2 and the evaporator 4 are connected to each other). Temperature difference and height difference of the refrigerant temperature,
Phase change due to pressure), and the cooling effect can be obtained only in a situation where the outdoor temperature is sufficiently lower than the indoor temperature. for that reason,
In the summer operation in which the outside air temperature is high, the cooling effect in the natural circulation of the refrigerant cannot be obtained depending on the required indoor temperature conditions, and the time in the cooling operation mode by the operation of the compressor 1 increases,
There was a problem that it was difficult to reduce the operating cost.

In the conventional cooling device described with reference to FIG. 3, in the forced refrigerant circulation mode using ice cold storage, the refrigerant gas is circulated by the operation of the refrigerant gas pump 19 in the heat radiation operation. There is a problem in that energy consumption is inferior to that of the cooling device of FIG. 2 due to consumption.

Further, since only the cold heat source stored in the ice cold storage tank 22 is used as the condensation heat source in the heat dissipation operation mode,
Even at a time when the outside air temperature is sufficiently lowered in winter or the like and the outside air can be used as a condensing cold heat source, the compressor 1 must be operated at night as a cold heat source for a heat dissipation operation to perform ice making.
Also in this aspect, there is a problem that energy saving property is lacking.

In addition, the suppression and leveling of energy demand
It is an international issue as a measure to prevent global warming. On the other hand, the current state of power consumption in Japan reaches a peak in demand in the afternoon of summer in the afternoon of two to three hours due to the spread of cooling devices. To meet this maximum power demand, each power company invests in power plant construction.However, this cooling power demand has large usage during the day and at night, and also has a large amount during summer and winter. There is a gap. In order to cover short-term power demand in summer, investment in power plant construction is unrealistic.Each power company has been promoting the use of air-conditioning systems using cold storage in order to improve the imbalance in cooling power demand. To give a huge discount on nighttime electricity charges for cold storage.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a cooling device which can greatly reduce the power consumption of a compressor and has high energy saving. .

[0016]

According to a first aspect of the present invention, there is provided a cooling apparatus for compressing a refrigerant gas into a superheated refrigerant gas, and radiating the superheated refrigerant gas to the outside air. A condenser as a refrigerant liquid, a first expansion valve as an adiabatic expansion of the refrigerant liquid and a low-pressure two-phase refrigerant in a gas-liquid mixed state, and a first heat of vaporization when the refrigerant liquid becomes refrigerant gas. A first refrigerant forced circulation circuit including a first evaporator that absorbs heat from the object to be cooled, a second expansion valve that adiabatically expands the refrigerant liquid from the condenser, and a second object to be cooled. A second evaporator that is provided in the regenerator and that absorbs heat of vaporization from the second member to be cooled by the refrigerant liquid that has passed through the second expansion valve;
A second compressor forcibly including the compressor that compresses the refrigerant gas from the evaporator into an overheated refrigerant gas, and the condenser that radiates the superheated refrigerant gas to the outside air to generate a refrigerant liquid. A circulation circuit, a first natural circulation condenser provided in the cold storage tank and radiating heat of condensation of the natural circulation refrigerant gas to the second cooled object to form a natural circulation refrigerant liquid; A natural circulation expansion valve that adiabatically expands the natural circulation refrigerant liquid into a low-pressure two-phase refrigerant in a gas-liquid mixed state, and a natural circulation refrigerant liquid that is provided at a lower position than the first natural circulation condenser. A first refrigerant natural circulation circuit including a natural circulation evaporator that absorbs heat of vaporization from the first cooled object when the heat of vaporization becomes a natural circulation refrigerant gas, and converts the heat of condensation of the natural circulation refrigerant gas to outside air. A second natural circulation condenser that radiates heat to the natural circulation refrigerant liquid, The natural circulation expansion valve, which adiabatically expands the natural circulation refrigerant liquid to produce a low-pressure two-phase refrigerant in a gas-liquid mixed state, and the natural circulation refrigerant provided at a lower position than the second natural circulation condenser. A second refrigerant natural circulation circuit including the natural circulation evaporator that absorbs heat of vaporization when the liquid becomes natural circulation refrigerant gas from the first cooled object.

Further, in the cooling device according to the second aspect, the first
The object to be cooled is room air, and the second object to be cooled is water.

Further, in the cooling device according to the third aspect, the temperatures of the outside air, the first object to be cooled, and the second object to be cooled are detected, and the path of the refrigerant is set to the first path according to the value of this temperature. And a control means for selecting any one of the forced refrigerant circulation circuit, the second forced refrigerant circuit, the first natural refrigerant circuit, and the second natural refrigerant circuit.

Further, the cooling device according to the fourth aspect of the present invention is provided with control means for causing the refrigerant gas to flow through the second refrigerant forced circulation circuit to generate ice in the cold storage tank depending on the time zone.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a cooling device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a refrigeration cycle of the cooling device of the present invention. In this figure, a compressor 1, a condenser 2, a first expansion valve 3, a first evaporator 4, and a suction accumulator 5 are the same as the conventional components shown in FIGS. The components, the refrigerant flow switching valve 9, the refrigerant downcomer 31 and the refrigerant upcomer 32 make the first
Of the refrigerant forced circulation circuit. Also, the compressor 1,
The condenser 2, the refrigerant flow switching valve 8, the second expansion valve 6, the second evaporator 7 provided in the cold storage tank 22 containing water as the second object to be cooled, and the suction accumulator 5. 2 constitutes a refrigerant forced circulation circuit.

When the refrigerant liquid liquefied by the condenser 2 flows into the first evaporator 4, the refrigerant liquid is adiabatically expanded by the first expansion valve 3 and becomes a two-phase refrigerant in a gas-liquid mixed state. , First
The interior of the indoor unit 24 is cooled by absorbing the heat of vaporization when the refrigerant liquid becomes the refrigerant gas in the evaporation 4 of the air from the air in the indoor unit 24 as the first cooled object. on the other hand,
When the refrigerant liquid liquefied in the condenser 2 flows to the second evaporator 7 side, the refrigerant liquid is adiabatically expanded by the second expansion valve 6 and becomes a two-phase refrigerant in a gas-liquid mixed state. The heat of vaporization when the refrigerant liquid becomes the refrigerant gas in the evaporator 7 is transferred to the regenerator 2 which is the object to be cooled.
By absorbing heat from the water in 2, ice is generated and cold heat is stored.

Also, a natural circulation evaporator 12, which is provided in the indoor unit 24 and absorbs heat from the air in the indoor unit 24, a refrigerant riser 35, and a heat storage tank installed at a predetermined higher position than the indoor unit 24 A first refrigerant natural circulation circuit is configured by the first natural circulation condenser 17, the refrigerant flow switching valve 16, the refrigerant down pipe 36, and the natural circulation expansion valve 11 provided inside 22. In addition, the natural circulation evaporator 1
2. Refrigerant riser 35, refrigerant flow switching valves 13 and 15, second natural circulation condenser 10 provided in outdoor unit 23 installed at a predetermined higher position than indoor unit 24, refrigerant downcomer 36 The natural refrigerant expansion valve 11 forms a second refrigerant natural circulation circuit.

Usually, the condenser 2 and the second condenser for natural circulation 10 are provided with a blower in each of the outdoor unit 21 and the outdoor unit 23 in order to improve the heat exchange efficiency with the outside air which is the heat radiating body. Is done. Similarly, the indoor unit 24 is provided with a blower to improve the efficiency of heat exchange between the first evaporator 4 and the indoor air, which is the object to be cooled, of the natural circulation evaporator 12.

Next, the operation of the cooling device according to this embodiment will be described. There are three cooling operation modes for the cooling operation of this cooling device. First, the first cooling operation mode will be described. In this cooling operation mode, refrigerant flows through the first refrigerant forced circulation circuit. The refrigerant gas vaporized by the heat absorption in the first evaporator 4 is compressed by the compressor 1 and is overheated and pressurized. This refrigerant gas is radiated in the condenser 2, and the condensed and liquefied refrigerant liquid passes through the first expansion valve 3, is decompressed and expanded, becomes a two-phase refrigerant, and again absorbs heat in the indoor unit 24 by evaporating in the evaporator 4. Cooling.

Next, the second cooling operation mode will be described. In this cooling operation mode, the refrigerant flows through the second refrigerant natural circulation circuit. The refrigerant gas absorbed and vaporized by the natural circulation evaporator 12 rises in the refrigerant riser 35 due to the difference in specific gravity, and the second natural circulation condenser 10 releases heat of condensation to low-temperature outside air to liquefy. The liquefied refrigerant liquid descends the refrigerant downcomer pipe 36 by the action of gravity, is decompressed by the natural circulation expansion valve 11, and absorbs heat in the natural circulation evaporator 12. In the natural circulation evaporator 12, the refrigerant is vaporized again,
The refrigerant riser 35 is raised and returned to the natural circulation condenser 10,
In the condenser 10 for natural circulation, it is liquefied again. In the cooling operation mode using the natural refrigerant circulation operation, the condition is that the outdoor temperature is sufficiently lower than the indoor temperature and a natural circulation driving force of the refrigerant is obtained.

Next, the third cooling operation mode will be described. In this cooling operation mode, the refrigerant flows through the first refrigerant natural circulation circuit.
The cold heat source of the ice filled inside is used as the condensation heat source of the natural circulation of the refrigerant. In the third cooling operation mode, the refrigerant gas vaporized in the natural circulation evaporator 12 rises in the refrigerant riser 35 due to the difference in specific gravity, and flows into the first natural circulation condenser 17.
Then, the heat of condensation is released to the ice in the cold storage tank 22 to liquefy. The liquefied refrigerant liquid descends through the refrigerant downcomer pipe 36 by the action of gravity, is decompressed by the natural circulation expansion valve 11, absorbs heat in the natural circulation evaporator 12, and is vaporized again. The vaporized refrigerant gas rises in the refrigerant riser 35 and flows into the first natural circulation condenser 1.
Return to 7 again. In the cooling operation mode based on the natural refrigerant circulation operation, the cold heat source stored in the cold storage tank 22 is used as a condensing heat source, and the refrigerant natural circulation cooling operation is reliably performed without being affected by the outdoor temperature condition. Can be.

Ice is generated in the regenerator 22 by circulating the refrigerant through the second forced circulation circuit at night, for example, when the electricity rate is low. That is, the refrigerant liquid that has flowed out of the condenser 2 is adiabatically expanded by the second expansion valve 6 to become a two-phase refrigerant in a gas-liquid mixed state. Ice is generated in the cold storage tank 22.

Embodiment 2 In the above-described cooling device, a control means for enabling the switching of the first to third cooling operation modes by detecting the outside air, the indoor temperature and the temperature in the cold storage tank 22 and automatically by a timer function or the like is provided. It may be added.

In this embodiment, for example, in a state where the outside air temperature is lower than the target temperature of the indoor unit 24 to be maintained by cooling by 5 ° C. or more, the above-mentioned second cooling operation mode Is switched to That is, the second refrigerant natural circulation circuit is formed by opening the refrigerant flow switching valve 13 and closing the refrigerant flow switching valve 14 between the outdoor unit 23 and the indoor unit 24, and utilizes low-temperature outside air. Thus, the refrigerant is naturally circulated between the second natural circulation condenser 10 and the natural circulation evaporator 12, and the inside of the indoor unit 24 is cooled. During the operation of the cooling device in the second cooling operation mode, for example, from 10 pm to 8 am
In the night time period until the hour, cold heat is stored in the cold storage tank 22 by the cold storage operation based on a signal from the control means.

In the daytime when the outside air temperature rises and the difference between the outside air temperature and the indoor target temperature becomes less than 5 ° C., and sufficient cooling effect cannot be obtained in the natural circulation cooling using the low temperature outside air, the control means is used. The refrigerant flow switching valve 13 is closed and the refrigerant flow switching valve 14 is opened in response to the signal from the air-cooled second natural circulation condenser 10 in the outdoor unit 23 to the first in the cold storage tank 22. Condenser for natural circulation 17
The refrigerant circulation circuit is switched to the indoor unit 2 continuously.
The inside of 4 is cooled.

Thereafter, in a state where the outside air temperature is higher than the room temperature, the cold heat source stored in the cold storage tank 22 is consumed, and the ice in the cold storage tank 22 becomes water, and the temperature and the room air When the cooling effect cannot be obtained by the refrigerant natural circulation cooling method with the temperature difference, the first
The cooling operation is switched to the cooling operation mode. That is,
By the signal from the control means, the refrigerant flow switching valve 8 is closed,
The first cooling operation mode is switched by opening the refrigerant flow switching valve 9 and driving the compressor 1.

In the cooling devices of the above embodiments, air is used as the first object to be cooled. However, the air is not limited to this, and may be, for example, water.

[0033]

As described above, according to the cooling apparatus of the first aspect of the present invention, when the outside air temperature is lower than the temperature of the object to be cooled by a predetermined temperature or more, the outside air temperature is reduced. By adopting the refrigerant natural circulation cooling system that utilizes the temperature difference between the compressor and the object to be cooled and the height difference between the evaporator and the condenser, the power consumption of the compressor can be significantly reduced.

In the cooling device according to the second aspect, the second
Since the object to be cooled is water, a condensed heat cooling source having a large heat capacity can be obtained at low cost.

In the cooling device according to the third aspect, the temperatures of the outside air, the first cooled object, and the second cooled object are detected, and the path of the refrigerant is set to the first temperature in accordance with the detected temperature. The cooling device is efficiently operated because the cooling unit is provided with a control means for selecting any one of the refrigerant forced circulation circuit, the second refrigerant forced circulation circuit, the first refrigerant natural circulation circuit, and the second refrigerant natural circulation circuit. .

Further, the cooling device according to claim 4 is provided with control means for causing the refrigerant gas to flow through the second refrigerant forced circulation circuit to generate ice in the cold storage tank depending on the time zone.
For example, by generating ice at night when the power rate is low, the operating cost can be significantly reduced.

[Brief Description of the Drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle in a cooling device of the present invention.

FIG. 2 is a configuration diagram illustrating an example of a conventional cooling device.

FIG. 3 is a configuration diagram showing another example of a conventional cooling device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 compressor, 2 condenser, 17 first natural circulation condenser, 10 second natural circulation condenser, 3 first expansion valve, 6 second expansion valve, 11 natural circulation expansion valve, 4
1st evaporator, 7 2nd evaporator, 12 natural circulation evaporator, 21, 23 outdoor unit, 24 indoor unit,
22 Cool storage tank.

Claims (4)

[Claims] 1. A compressor that compresses a refrigerant gas to produce a superheated refrigerant gas, a condenser that radiates the superheated refrigerant gas to the outside air to produce a refrigerant liquid, and a compressor that adiabatically expands the refrigerant liquid. A first expansion valve including a first expansion valve that is a low-pressure two-phase refrigerant in a liquid-mixed state, and a first evaporator that absorbs heat of vaporization from a first cooled object when the refrigerant liquid becomes a refrigerant gas. A refrigerant forced circulation circuit, a second expansion valve for adiabatically expanding the refrigerant liquid from the condenser, and a refrigerant provided in a cold storage tank containing a second object to be cooled and passing through the second expansion valve. A second evaporator in which the liquid absorbs heat of vaporization from the second object to be cooled, the compressor that compresses the refrigerant gas from the second evaporator into a superheated refrigerant gas, A second refrigerant forced circulation circuit including: the condenser that radiates the refrigerant gas to the outside air to form a refrigerant liquid; A first natural circulation condenser provided in the cool storage tank and radiating heat of condensation of the natural circulation refrigerant gas to the second cooled object to form a natural circulation refrigerant liquid; and a condensed natural circulation refrigerant. A natural circulation expansion valve that adiabatically expands the liquid to produce a low-pressure two-phase refrigerant in a gas-liquid mixed state; and a natural circulation refrigerant liquid that is provided at a lower position than the first natural circulation condenser. A first refrigerant natural circulation circuit including a natural circulation evaporator that absorbs heat of vaporization when becoming gas from the first object to be cooled; and a natural circulation by releasing heat of condensation of the natural circulation refrigerant gas to the outside air. A second natural circulation condenser as a refrigerant fluid for use, a natural circulation expansion valve for adiabatically expanding the condensed natural circulation refrigerant liquid to produce a low-pressure two-phase refrigerant in a gas-liquid mixed state, Is provided at a lower position than the natural circulation condenser, and the natural circulation refrigerant liquid is used for natural circulation. Cooling apparatus and a second refrigerant natural circulation circuit including said natural circulation evaporator which absorbs heat of vaporization when the medium gas from the first object to be cooled. 2. The method according to claim 1, wherein the first object to be cooled is room air.
The cooling device according to claim 1, wherein the object to be cooled is water. 3. The temperature of the outside air, the first object to be cooled, and the temperature of the second object to be cooled are detected, and the path of the refrigerant is changed according to the value of the temperature. The cooling device according to claim 1 or 2, further comprising control means for selecting any one of a forced refrigerant circulation circuit, a first refrigerant natural circulation circuit, and a second refrigerant natural circulation circuit. 4. The cooling device according to claim 2, further comprising control means for causing the refrigerant gas to flow through the second refrigerant forced circulation circuit according to a time zone to generate ice in the regenerator.