JP2904650B2 - Absorption chiller / heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption chiller / heater which can be used as a double-effect absorption refrigerator in summer and a single-effect absorption heat pump in winter.

[0002]

2. Description of the Related Art Conventional double effect absorption refrigerators include, for example, Japanese Patent Publication No. 60-24380 and Japanese Patent Application Laid-Open No. 62-18 / 1987.
Japanese Patent Application Laid-Open No. 6178, Japanese Patent Application Laid-Open No. 63-25464, and the like are known, but none of them are devices having switching means for double effect / single effect.

A double-effect absorption refrigerator has a high-temperature heat exchanger and a low-temperature heat exchanger, and the absorbent is passed through a high-temperature regenerator, a high-temperature heat exchanger, a low-temperature regenerator and a low-temperature heat exchanger. Refluxed to the absorber, but due to the high resistance of the heat exchanger, recently, in addition to the diluent pump for sending low concentration absorbent (dilute) from the absorber to the high temperature regenerator, A concentrate pump is installed between the regenerator and the low-temperature heat exchanger.

[0004] However, even in a device incorporating two pumps for a dilute solution and a concentrated solution, if the operation is switched to the single effect operation, the resistance when passing through the heat exchanger is too large.
The single-effect operation has a problem that the regeneration pressure is lower than that of the double-effect operation, and the resistance of the heat exchanger cannot be overcome to stably circulate the absorbent.

In order to solve such a problem, the present inventors have already shown in FIG. 5 a refrigerant vapor pipe opening from a high-temperature regenerator 1 to a condenser 3 via a low-temperature regenerator 2 and a valve (V1). 12 and 12a, and refrigerant vapor pipes 12 and 12b that open directly to the condenser 3 via the valve (V2), and the low temperature from the high temperature regenerator 1 via the high temperature heat exchanger 6 and the valve (V3). High temperature heat exchanger 6 of intermediate liquid pipe 14 opening to regenerator 2
A valve (V6) connects the inlet side and the inlet of the concentrate pump P3 of the concentrate pipe 16 opening to the absorber 5 via the concentrate pump P3 and the low temperature heat exchanger 7 from the low temperature regenerator 2. An absorption chiller / heater provided for communication is disclosed in Japanese Patent Application No. 3-7375.
1 suggests.

[0006]

However, in the absorption chiller / heater of the above construction, it is difficult to improve the coefficient of performance because only the low-temperature heat exchanger is used at the time of forming the single effect cycle. In addition, the absorption liquid (intermediate liquid) discharged from the high-temperature regenerator flows directly into the concentrated liquid pump, so heat resistance becomes a problem, and the heating in the high-temperature regenerator has to be suppressed. For example, it is difficult to supply (for example, 50 ° C. or higher), and solving these problems has been a problem.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and comprises a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, a high-temperature heat exchanger and In a double-effect absorption refrigerator configured by connecting a low-temperature heat exchanger by piping, a refrigerant vapor pipe that opens from a high-temperature regenerator to a condenser via a low-temperature regenerator and a valve (V1) is provided. The condenser or the inlet of the low-temperature regenerator of the steam pipe is provided so as to be able to communicate with the condenser via the valve (V2), and is opened from the high-temperature regenerator to the low-temperature regenerator via the high-temperature heat exchanger and the valve (V3). A valve (V4) is connected between the outlet of the high-temperature heat exchanger of the intermediate liquid pipe to be discharged and the outlet of the concentrated liquid pump of the concentrated liquid pipe that opens from the low-temperature regenerator to the absorber via the concentrated pump and the low-temperature heat exchanger. An absorption chiller / heater characterized by being provided so as to be able to communicate through

[0008] In a double-effect absorption refrigerator configured by connecting a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, a high-temperature heat exchanger and a low-temperature heat exchanger by piping, low-temperature regeneration from the high-temperature regenerator is performed. A refrigerant vapor pipe that opens to the condenser via a condenser and a valve (V1), and connects the condenser of the high-temperature regenerator or the low-temperature regenerator of the vapor pipe with the condenser (V2).
And a high-pressure heat exchanger outlet side of an intermediate liquid pipe opening from the high-temperature regenerator to the low-temperature regenerator via the high-temperature heat exchanger and the valve (V3). And an absorption chiller / heater characterized in that the concentration pipe is connected to the concentration pump inlet side of the concentration pipe that opens to the absorber via the low-temperature heat exchanger through a valve (V5). To solve the problems of the prior art.

[0009]

In the absorption chiller / heater according to the present invention, the valve (V
When 1) and (V3) are opened and the valves (V2) and (V4) or (V5) are closed, efficient cooling operation can be performed in the normal double-effect mode.

On the other hand, in the single effect operation (the concentrated pump is stopped) in which the valves (V1) and (V3) are closed and the valves (V2) and (V4) are opened, the refrigerant vapor generated in the high temperature regenerator is discharged. It flows directly into the condenser via the valve (V2) and heats the water pipe connected to the condenser. The water flowing through this water pipe
Since the absorbing liquid is heated by the heat generated when the absorbing liquid absorbs the refrigerant vapor in the absorber, the thermal efficiency is higher than the mere heating by the refrigerant vapor flowing from the high-temperature regenerator.

Further, the intermediate liquid discharged from the high-temperature regenerator to the intermediate liquid pipe and guided to the absorber is a dilute liquid guided from the absorber to the high-temperature regenerator at two places, a high-temperature heat exchanger and a low-temperature heat exchanger. Since the heat is exchanged with the heat and heated, the amount of heating in the high-temperature regenerator can be reduced, and the coefficient of performance of the apparatus is improved.

In addition, since the intermediate liquid discharged from the high-temperature regenerator and guided to the absorber does not pass through the concentrated liquid pump, the heating temperature in the high-temperature regenerator is increased irrespective of the heat resistance of the pump to increase the refrigerant temperature. It is possible to generate a large amount of steam, so that the heating effect of the refrigerant steam in the condenser increases, and it becomes possible to supply hot water having a high temperature, for example, exceeding 50 ° C.

Further, in the case of the single effect operation in which the valves (V1) and (V3) are closed and the valves (V2) and (V5) are opened, in addition to the operation and effect of the single effect operation,
By the action of the concentrated liquid pump P3, the intermediate liquid discharged from the high-temperature regenerator to the intermediate liquid pipe passes through the high-temperature heat exchanger and the low-temperature heat exchanger without difficulty and is sent to the absorber.

In this case, the intermediate liquid discharged from the high-temperature regenerator to the intermediate liquid pipe passes through the concentrated liquid pump. In this case, the intermediate liquid is diluted by the high-temperature heat exchanger as described above. Since the liquid is heated and the temperature itself is lowered, the heat resistance of the concentrated liquid pump does not become a problem. Therefore, also in this case, the heating temperature in the high-temperature regenerator is increased to promote the generation of a large amount of refrigerant vapor, and a large amount of refrigerant vapor can be sent to the condenser. it can.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described with reference to FIGS. 1 and 2. 1 is a high-temperature regenerator, 2 is a low-temperature regenerator, 3 is a condenser,
4 is an evaporator, 5 is an absorber, 6 is a high-temperature heat exchanger, 7 is a low-temperature heat exchanger, and the equipment itself is different from that used in a conventionally known double-effect absorption refrigerator. is not.

Reference numeral 11 denotes a diluent pipe for sending the dilute liquid B1 accumulated at the bottom of the absorber 5 to the high-temperature regenerator 1, and a dilute liquid pump P1 is provided at the outlet side of the absorber 5. The dilute solution B1 is a solution in which the absorption liquid (for example, LiBr) absorbs a large amount of refrigerant (for example, water) in the absorber 5 and the concentration of the absorption liquid is reduced.

Reference numeral 12 denotes a refrigerant vapor pipe for guiding the refrigerant vapor A1 separated from the absorbing liquid in the high-temperature regenerator 1 to the condenser 3. The downstream side of this refrigerant vapor pipe 12 is branched into two,
One refrigerant vapor pipe 12a passes through the inside of the low-temperature regenerator 2,
The other refrigerant vapor pipe 12b opens directly to the condenser 3 via the solenoid valve V2, while the other refrigerant vapor pipe 12b opens directly to the condenser 3 via the solenoid valve V2. In addition, a refrigerant vapor pipe from the high temperature regenerator 1 to the condenser 3 may be provided with an electromagnetic valve or the like separately from the refrigerant vapor pipe 12.

Reference numeral 13 denotes a refrigerant liquid pipe for guiding the liquid refrigerant A to the evaporator 4. The refrigerant A condensed in the condenser 3 and the refrigerant A accumulated under the evaporator 4 are disposed in front of the evaporator 4. The pipes are joined so that they can be supplied to the spraying means 21 provided above the evaporator 4. In addition, P2 is a refrigerant pump for sending the refrigerant A accumulated at the bottom of the evaporator 4 to the spraying means 21.

Reference numeral 14 denotes an intermediate liquid pipe for guiding the intermediate liquid B2 concentrated in the high-temperature regenerator 1 to the low-temperature regenerator 2, in which a high-temperature heat exchanger 6 and a solenoid valve V3 are provided in the middle. Then, at the outlet side of the high-temperature heat exchanger 6, the absorbent line 15
And can communicate with the concentrate pipe 16 on the outlet side of the concentrate pump P3 via the solenoid valve V4.

The concentrated liquid pipe 16 is for guiding the concentrated liquid B3 concentrated in the low-temperature regenerator 2 to the spraying means 22 of the absorber 5, and in the middle of the low-temperature heat exchange with the concentrated liquid pump P3. Vessel 7 is provided.

Numerals 31 and 32 denote pipes through which water as a heat medium flows. The water pipe 31 can be circulated through the interior of the absorber 5 and the condenser 3, and the water pipe 32 can be circulated through the interior of the evaporator 4. Each is piped as possible. And the water pipe 31
At the outlet side of the condenser 3 and at the outlet side of the evaporator 4 of the water pipe 32, temperature sensors 41 and 42 for measuring respective water temperatures are provided. The temperature sensors 41 and 42 may be wired so that they can be measured at the same time, or they may be connected so that they can be measured separately. In this case, when the switch 51 is switched, any measurement data is captured. , A control valve 5 such as an electric valve,
2 is controlled so as to control the combustion by controlling the amount of gas supplied to the gas burner 53.

When the apparatus of the present invention having the above configuration is used for cooling operation in summer, the solenoid valves V2 and V4 are used as shown in FIG.
Is closed, the solenoid valves V1 and V3 are opened, and the switch 51 is set so that the opening of the control valve 52 is controlled based on the water temperature of the water pipe 32 measured by the temperature sensor 42 and the heating power of the gas burner 53 can be adjusted, for example. Dilution pump P1, refrigerant pump P2, and concentrate pump P3 are each driven to perform double-effect operation.

In the high-temperature regenerator 1, since the dilute solution B1 is heated under a predetermined condition, for example, an internal pressure of 700 mmHg, the refrigerant vapor A1 is generated at, for example, a liquid temperature of 155 ° C., and the concentration of the absorbing liquid is, for example, 58%. % To 61%, and is discharged into the intermediate liquid pipe 14 as the intermediate liquid B2.

The intermediate liquid B2 flowing into the intermediate liquid pipe 14 heats the dilute liquid B1 flowing in the direction of the high-temperature regenerator 1 through the dilute liquid pipe 11 in the high-temperature heat exchanger 6 from, for example, 70 ° C. to 120 ° C. The intermediate liquid B2 itself is deprived of heat and cooled to, for example, 85 ° C., and enters the low-temperature regenerator 2 via the solenoid valve V3.

The intermediate liquid B2 flowing into the low-temperature regenerator 2 has a refrigerant vapor A1 of, for example, 98.degree.
To generate a refrigerant vapor A2, which is discharged into the concentrated liquid pipe 16 as a concentrated liquid B3 having an absorption liquid concentration of, for example, 63.6%. The temperature at which the concentrated liquid B3 is discharged to the concentrated liquid pipe 16 is, for example, 91.3 ° C. On the other hand, the intermediate liquid B
The refrigerant vapor A1 that has heated 2 is deprived of heat, condenses, becomes liquid, and enters the condenser 3 through the solenoid valve V1. The internal pressure of the low-temperature regenerator 2 is reduced to, for example, 56 mmHg so that the refrigerant is easily evaporated from the intermediate liquid B2.

The refrigerant vapor A2 generated in the low temperature regenerator 2 and entering the condenser 3 heats the water flowing inside the water pipe 31 to, for example, 37.5 ° C. At this time, the refrigerant vapor A2 itself is deprived of heat and condenses, and is mixed with the liquid refrigerant A entering from the solenoid valve V1. Then, the refrigerant is discharged to the refrigerant liquid pipe 13 at, for example, 40 ° C. and sent to the evaporator 4.

On the other hand, the concentrated liquid B 3 discharged from the low temperature regenerator 2 to the concentrated liquid pipe 16 is sent to the absorber 5 via the low temperature heat exchanger 7. Although the internal pressure of the low-temperature regenerator 2 is low, for example, 56 mmHg as described above, the concentrated liquid B3 is sent to the absorber 5 via the low-temperature heat exchanger 7 without difficulty because it is sent by the concentrated liquid pump P3. When passing through the low-temperature heat exchanger 7, the concentrated liquid B <b> 3
1 is heated, for example, from 36 ° C. to 70 ° C., and the concentrated liquid B3 itself is cooled from 91.3 ° C. to 52 ° C.

In the evaporator 4, the liquid refrigerant A is sprayed from the spraying means 21, and in the absorber 5, the concentrated liquid B 3 is sprayed from the spraying means 22. The evaporator 4 and the absorber 5 are
Like the conventional device, it is adjacent via an eliminator 23 having a minute gap that allows the vapor of the refrigerant A to permeate but does not allow the liquid particles of the refrigerant A to permeate. In addition, since the pressure inside is reduced to, for example, 6.1 mmHg, the sprayed refrigerant A evaporates vigorously into refrigerant vapor A3, enters the absorber 5 and is absorbed by the concentrated liquid B3 sprayed there, It becomes liquid B1.

As described above, the refrigerant vapor A3 generated in the evaporator 4 enters the adjacent absorber 5 through the eliminator 23, where it is absorbed by the concentrated liquid B3, and does not reach the saturation pressure. Therefore, the refrigerant A evaporates vigorously in the evaporator 4 and takes away heat of vaporization to lower the ambient temperature. For this reason,
The water pipe 32 guided into the evaporator 4 is cooled, and the water flowing inside the evaporator 4 is heated from, for example, 12 ° C. to a set temperature, for example, 7 ° C.
The cooling water is circulated and used as a heat medium for cooling.

On the other hand, in the absorber 5, when the concentrated liquid B3 absorbs the refrigerant vapor A3 that has entered through the eliminator 23, heat of absorption is generated, and the water inside the water pipe 31 is heated. This water is sent to the condenser 3 and heated to, for example, 37.5 ° C. as described above. Therefore, the water is guided to a cooling tower (not shown) and cooled to, for example, 32 ° C., circulated and used again as cooling water. Is done.

During operation, the cooling load is large and the temperature sensor 4
When the water temperature at the outlet side of the evaporator 4 of the water pipe 32 measured by 2 becomes higher than the above-mentioned set temperature of 7 ° C., the control valve 52 is opened greatly by the instruction of the controller 54 to increase the gas supply amount, and the heating power of the gas burner 53 is reduced. The raising refrigerant vapor A1 is increased. When the generation amount of the refrigerant vapor A1 increases, the evaporation amount of the refrigerant A increases in the evaporator 4 and a large amount of heat of vaporization is taken, so that the cooling effect becomes large and the water temperature of the water pipe 32 on the outlet side of the evaporator 4 decreases. Conversely, when the cooling load is small and the water temperature at the outlet side of the evaporator 4 of the water pipe 32 becomes lower than the above-mentioned set temperature of 7 ° C., the gas burner 53 is returned to the set water temperature by appropriately reducing the thermal power.

Next, an example in which the present apparatus is used as a single-effect heat pump in winter will be described with reference to FIG. 2. In this case, the solenoid valves V1 and V3 are closed, and the solenoid valves V2 and V4 are closed.
The switch 51 is set so that the control valve 52 can be controlled by the water temperature on the outlet of the condenser 3 of the water pipe 31 measured by the temperature sensor 41, the concentrated liquid pump P3 is stopped, and the diluted liquid pump P1 and the refrigerant pump P2 are To drive. Note that a description of a portion that functions in the same manner as in the case of double effect is omitted.

The refrigerant vapor A1 generated in the high-temperature regenerator 1 is
It directly enters the condenser 3 via the solenoid valve V2 to heat the water pipe 31. By this heating, the water flowing in the water pipe 31 is heated to a predetermined temperature, for example, 45 ° C., and the refrigerant vapor A1 itself condenses to become hot water. Therefore, the condenser 3 in this case is a water heater in appearance, and the hot water of the water pipe 31 passing through the condenser 3 is used as a heat source for heating. Then, after being used for heating, the temperature of this hot water drops to, for example, 40 ° C. and returns to the absorber 5 again.

The hot water extracted from the condenser 3 through the water pipe 31 is also heated in the absorber 5 by absorption heat generated when the intermediate liquid B2 sent from the high-temperature regenerator 1 absorbs the refrigerant vapor A3. The thermal efficiency is higher than in the case of simple heating by the refrigerant vapor A1 generated in the high-temperature regenerator 1.

Further, the intermediate liquid B2 discharged from the high-temperature regenerator 1 to the intermediate liquid pipe 14 is supplied to the high-temperature heat exchanger 6 and the low-temperature heat exchanger 7 from the absorber 5 through the rare liquid pipe 11 at a high temperature. Heat exchanges with the dilute liquid guided to the regenerator 1 and heats it.
Since the temperature of the diluted liquid flowing into the high-temperature regenerator 1 reaches, for example, 85 ° C., it is possible to reduce the heating power of the gas burner 53, and therefore, even in the single effect operation, the thermal efficiency is significantly larger than that of the simple boiler heating. For example, the coefficient of performance of general boiler heating is around 0.85, while that of the apparatus of the present invention is about 1.4.

The intermediate liquid discharged from the high-temperature regenerator 1 to the intermediate liquid pipe 14 and led to the absorber 5 does not pass through the concentrated liquid pump P3, so that the high-temperature regenerator is independent of the heat resistance of the pump. In 1, the control valve 52 is opened, the supply of gas to the gas burner 53 is increased, and the thermal power is increased, so that a large amount of refrigerant vapor can be generated. Therefore, the heating effect of the refrigerant vapor in the condenser 3 increases. Therefore, the water pipe 31
The hot water flowing through can be hot water exceeding 50 ° C.

FIGS. 3 and 4 show an absorption liquid line 15A instead of the absorption liquid line 15 and the solenoid valve V4 shown in FIGS. This shows a second embodiment in which the liquid pipe 16 and the inlet side of the concentrated liquid pump P3 are provided so as to be able to communicate with each other via an electromagnetic valve V5. Also in this case, the description of the same parts as those in the above embodiment is omitted.

Also in the absorption chiller / heater of the second embodiment, the cooling operation in the double effect mode in which the solenoid valves V2 and V5 are closed and the solenoid valves V1 and V3 are opened is performed in the cooling operation of the first embodiment. It has the same configuration as that of the absorption chiller / heater of No. 1, and thus it is apparent that it functions similarly.

In the case of a single-effect mode heat pump operation in winter in which the solenoid valves V1 and V3 are closed and the solenoid valves V2 and V5 are opened, the intermediate liquid discharged from the high temperature regenerator 1 to the intermediate liquid pipe 14 is operated. B2 is passed through the high-temperature heat exchanger 6, the solenoid valve V5 of the absorbing liquid pipe 15A and the low-temperature heat exchanger 7 without difficulty by the operation of the concentrated liquid pump P3 and sent to the absorber 5, and the same as in the first embodiment. The effect is more stably exhibited.

In this case, the intermediate liquid discharged from the high-temperature regenerator 1 to the intermediate liquid pipe 14 passes through the concentrated liquid pump P3. In this case, the intermediate liquid is supplied to the high-temperature heat exchanger as described above. In step 6, heat is exchanged with the diluent in the diluent tube 11 to heat the diluent, and the temperature of the diluent is lowered, so that the heat resistance of the concentrated pump P3 does not matter. Therefore, also in this case, it is possible to generate a large amount of refrigerant vapor by increasing the heating temperature in the high-temperature regenerator 1 and to send a large amount of refrigerant vapor to the condenser 3. Can supply water.

[0041]

As described above, according to the apparatus according to the present invention, the operation is performed in the double effect mode in summer when the cooling load is large, and is supplied to the heating as a single effect heat pump in winter when there is no cooling load in winter. I can do it. In addition, the coefficient of performance for heating using a normal water heater is about 0.85 like a general heating boiler, but this device operates with a heat pump, and the high-temperature regenerator has a high-temperature heat exchanger and a low-temperature heat exchanger. Since the dilute liquid flows in a state where the temperature reaches 85 ° C. after being heated at two places in the exchanger, the coefficient of performance is greatly improved to about 1.4 because the amount of heating in the high-temperature heat exchanger can be reduced, and throughout the year. Energy saving has become possible.

Further, since the high-temperature absorbing liquid does not flow into the concentrated liquid pump, the heating temperature in the high-temperature regenerator can be increased regardless of the heat resistance of the pump. In a large amount to increase the heating action in the condenser, and supply of high-temperature water exceeding, for example, 50 ° C. has become possible.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram when a first present invention apparatus is operated for cooling.

FIG. 2 is an explanatory diagram when a first operation of the present invention is performed in a heating operation.

FIG. 3 is an explanatory diagram when a second present invention apparatus is operated for cooling.

FIG. 4 is an explanatory diagram when a second operation of the present invention is performed in a heating operation.

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature regenerator 2 Low temperature regenerator 3 Condenser 4 Evaporator 5 Absorber 6 High temperature heat exchanger 7 Low temperature heat exchanger 11 Rare liquid pipe 12 Refrigerant vapor pipe 13 Refrigerant liquid pipe 14 Intermediate liquid pipe 15 Absorbing liquid pipe 15A Absorption Liquid conduit 16 Concentrated liquid pipe 21 Spraying means 22 Spraying means 31 Water pipe 32 Water pipe 41 Temperature sensor 42 Temperature sensor 51 Switch 52 Control valve 53 Gas burner 54 Controller A Refrigerant A1 Refrigerant vapor B1 Rare liquid B2 Intermediate liquid B3 Concentrate P1 Rare liquid pump P2 Refrigerant pump P3 Concentrate pump V1 Solenoid valve V2 Solenoid valve V3 Solenoid valve V4 Solenoid valve V5 Solenoid valve V6 Solenoid valve

──────────────────────────────────────────────────続 き Continuation of the front page (72) Noriyuki Nishiyama, Inventor 656, Saninishi, Ninomiya-cho, Naka-gun, Kanagawa (72) Inventor Yasushi Yasui 6-9-13 Chitosedai, Setagaya-ku, Tokyo (56) References JP-A Sho58 -140576 (JP, A) JP-A-58-31264 (JP, A) JP-A-5-231739 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 15/00

Claims (2)

(57) [Claims] 1. A double-effect absorption refrigerator comprising a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, a high-temperature heat exchanger and a low-temperature heat exchanger connected by piping. A refrigerant vapor pipe opening to the condenser via the low temperature regenerator and the valve (V1) is provided, and the high temperature regenerator or the low temperature regenerator inlet side of the vapor pipe and the condenser are connected to the valve (V2).
And a high-pressure heat exchanger outlet side of an intermediate liquid pipe opening from the high-temperature regenerator to the low-temperature regenerator via the high-temperature heat exchanger and the valve (V3). An absorption chiller / heater characterized in that a concentration pipe is connected to a concentration pump outlet side of a concentration pipe that opens to an absorber via a low-temperature heat exchanger through a valve (V4). 2. A double effect absorption refrigerator comprising a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, an absorber, a high temperature heat exchanger and a low temperature heat exchanger connected by piping. A refrigerant vapor pipe opening to the condenser via the low temperature regenerator and the valve (V1) is provided, and the high temperature regenerator or the low temperature regenerator inlet side of the vapor pipe and the condenser are connected to the valve (V2).
And a high-pressure heat exchanger outlet side of an intermediate liquid pipe opening from the high-temperature regenerator to the low-temperature regenerator via the high-temperature heat exchanger and the valve (V3). An absorption chiller / heater, wherein a concentration pipe is connected to a concentration pump inlet side of a concentration pipe which opens to an absorber via a low temperature heat exchanger via a valve (V5).