KR101060776B1 - Absorption Chiller - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique for improving heat recovery efficiency from a heat source fluid flowing in an absorption chiller in a configuration having fewer components and simplified piping. In particular, it is possible to attain miniaturization of the heat recovery device that recovers heat from the heat source fluid that has passed through the high temperature regenerator, and to provide a technique capable of improving the heat recovery efficiency of the heat retained by the heat source fluid.

The rare absorbing liquid pipe through which the rare absorbent liquid flows from the absorber to the high temperature regenerator is branched into the first rare liquid tube and the second rare liquid tube. The second lean tube includes a high temperature heat exchanger for performing heat exchange with the intermediate absorbent liquid generated in the high temperature regenerator and a low temperature heat exchanger for performing heat exchange of the concentrated absorbent liquid generated in the low temperature regenerator.

Absorption Chiller, Heat Recovery Machine, Heat Source Fluid Tube, Absorber, Refrigerant Pump

Description

Absorption Chillers {ABSORPTION REFRIGERATOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to absorption chillers (including absorption cold and hot water chillers) used for refrigeration and air conditioning, and more particularly, to dual-effect absorption chillers for steam generation.

BACKGROUND ART [0002] In the past, with increasing interest in global environmental issues, the demand for higher efficiency of equipment has increased. In particular, this tendency is remarkable in local air-conditioning facilities and commercial facilities, which have a long operating time, and there is an urgent need for improvement of equipment efficiency.

And it is proposed with this request to improve the heat recovery efficiency from the heat source fluid which distribute | circulates in an absorption type refrigerator (for example, refer patent document 1).

However, this branched and merged the rare tubes distributed by the rare liquid supplied from the absorber to the high temperature regenerator several times, so that the adjustment of the diluted liquid flowing through each of the branched rare tubes was difficult and laborious. In addition, in order to increase the efficiency of the absorption chiller, it is necessary to improve the temperature efficiency of each solution heat exchanger. However, the concentrate may be crystallized when the temperature decreases, thereby improving the temperature efficiency of the low temperature heat exchanger. There was a problem that there was not. In addition, when the flow rate of the cooling water is reduced in order to reduce the power of the auxiliary machine, there is also a problem that the temperature of the cooling water rises and the operating pressure also increases.

On the other hand, although it is the structure which provided the low pressure absorber, the low pressure evaporator, and the high pressure absorber and the high pressure evaporator, there exist some things which solved this subject (for example, refer patent document 2).

[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-056160

[Patent Document 2] Japanese Patent Application Laid-Open No. 2005-300126

However, Patent Document 2 has a problem in that the steam pipe through which the heat source fluid flows and the heat recoverer performing heat recovery from the heat source fluid must be of a high pressure design, resulting in high manufacturing costs.

In view of the above, the present invention provides a technique capable of improving the heat recovery efficiency from the heat source fluid circulating in the absorption chiller with a configuration having fewer components and simplified piping. In particular, the heat source fluid which distribute | circulates the high temperature regenerator is divided into two heat recoverers, and heat recovery is carried out, and it is the structure which can achieve the miniaturization of a heat recovery machine, and provides the technique which can improve the heat recovery efficiency of the heat retention of this heat source fluid.

The absorption chiller of the first invention distributes heat source fluid to heat the rare absorbent liquid, and generates a refrigerant vapor and an intermediate absorbent liquid, and reheats the intermediate absorbent liquid with the generated refrigerant vapor to generate refrigerant vapor and concentrated absorbent liquid. A low temperature regenerator, a condenser for condensing and condensing the refrigerant vapor generated in the high temperature regenerator and the refrigerant vapor generated in the low temperature regenerator, and condensing the refrigerant liquid condensed through the low temperature regenerator, and the refrigerant liquid from the condenser. Sprayed on a cold water pipe and evaporated again to allow cold heat supply to a heat load, and a concentrated absorbent liquid from the low temperature regenerator is introduced, and refrigerant vapor from the evaporator is absorbed into the concentrated absorbent liquid to generate a rare absorbent liquid. In the absorption chiller provided with an absorber,

The rare absorbing liquid pipe installed in communication with the high temperature regenerator from the absorber and branched from the absorber liquid to the first rare absorbing liquid pipe and the second rare absorbing liquid pipe, respectively, each of the first rare absorbing liquid pipe and the second rare absorbing liquid pipe. Is installed in communication with the high temperature regenerator, the first rare water absorbing tube is provided with a heat recoverer for performing heat exchange with a heat source fluid passed through the high temperature regenerator, and the second rare water absorbing tube is formed with an intermediate produced by the high temperature regenerator. And a high temperature heat exchanger for exchanging heat with the absorbent liquid and a low temperature heat exchanger for exchanging heat with the concentrated absorbent liquid generated in the low temperature regenerator, wherein the heat recovery unit is divided into at least two of the first heat recovery unit and the second heat recovery unit. The heat source fluid passed through the high temperature regenerator flows through the first heat recoverer and passes through the steam trap to the second heat recoverer. And that is characterized.

The absorption chiller of the second invention, according to the first invention, the rare water absorbing liquid flowing through the inside of the first rare water absorbing liquid tube to a high temperature regenerator on the absorber side of the heat recoverer provided on the first rare water absorbing liquid tube; A coolant drain heat recovery unit is provided, through which a low temperature regenerator flows through and the heat condensed refrigerant liquid performs heat exchange.

According to the first invention, the first rare water absorbing tube is provided with a heat recovery device for performing heat exchange with at least a heat source fluid passed through the high temperature regenerator, and the second rare water absorbing tube has a high temperature heat exchanger for performing heat exchange with the intermediate absorbing liquid generated in the high temperature regenerator. By providing a low temperature heat exchanger for performing heat exchange with the concentrated absorbent liquid generated in the air and the low temperature regenerator, the heat recovery efficiency from the heat source fluid flowing through the high temperature regenerator can be improved by the configuration which has few components and the piping was simplified. In addition, adjustment of the diluted liquid flowing through the branched first rare absorbing liquid pipe and the second rare absorbing liquid pipe can be facilitated, and the heat recovery efficiency from the heat source fluid can be improved. In particular, the heat source fluid that has passed through the high temperature regenerator is heat-recovered by the first heat recoverer during the circulation of the first rare water absorbing tube, and heat-recovered again by the second heat-recoverer via the steam trap. Therefore, the heat recovery from the heat source fluid to the rare absorbent liquid can be effectively achieved by the first heat recovery device, the second heat recovery device, and the refrigerant drain heat recovery device in a configuration capable of simplifying the design of the heat source fluid pipe including the miniaturization of the heat recovery device. Thus, the efficiency of the absorption refrigeration apparatus can be improved.

According to the second invention, in addition to the effect of the first invention, the refrigerant drain heat recovery unit in which the rare absorbent liquid flowing through the first rare absorbent liquid pipe and flowing to the high temperature regenerator and the refrigerant liquid passed through the low temperature regenerator for heat dissipation and condensation are heat-exchanged. By providing the heat recovery from the refrigerant liquid which has passed through the low temperature regenerator and radiated and condensed, the heat recovery from the heat source fluid can also be performed, and the device efficiency can be improved.

The absorption chiller of the present invention is a high temperature regenerator for circulating a heat source fluid to heat a rare absorbent liquid to generate refrigerant vapor and an intermediate absorbent liquid, and a low temperature for reheating the intermediate absorbent liquid with the generated refrigerant vapor to generate refrigerant vapor and concentrated absorbent liquid. A condenser for condensing and condensing the refrigerant vapor generated in the high temperature regenerator and the refrigerant vapor generated in the low temperature regenerator, and condensing the refrigerant liquid condensed through the low temperature regenerator, and the refrigerant liquid from the condenser. An evaporator which sprays onto a cold water pipe and evaporates again to enable the supply of cold heat to a heat load; In the absorption chiller provided with an absorber,

Installed in communication with the high temperature regenerator from the absorber, branching the rare absorbing liquid pipe through which the rare absorbing liquid flows into a first rare absorbing liquid pipe and a second rare absorbing liquid pipe, respectively, and each of the first rare absorbing liquid pipe and the second rare absorbing liquid pipe. Is installed in communication with the high temperature regenerator, the first rare water absorbing tube is provided with a heat recoverer for performing heat exchange with a heat source fluid passed through the high temperature regenerator, and the second rare water absorbing tube is formed with an intermediate produced by the high temperature regenerator. And a high temperature heat exchanger for exchanging heat with the absorbent liquid and a low temperature heat exchanger for exchanging heat with the concentrated absorbent liquid generated in the low temperature regenerator, wherein the heat recovery unit is divided into at least two of the first heat recovery unit and the second heat recovery unit. The heat source fluid passed through the high temperature regenerator passes through the first heat recoverer and passes through the steam trap to the second heat recoverer. That is, to describe the embodiments of the present invention are described below.

(First embodiment)

Next, an embodiment of the absorption chiller 100 of the present invention will be described. 1 is a configuration diagram of the piping of the absorption chiller 100 according to the present invention, and FIG. 2 is an external configuration diagram of the absorption refrigerator 100 according to the present invention.

The absorption chiller 100 according to the present invention is a dual-effect absorption chiller using, for example, water as a refrigerant and a lithium bromide (LiBr) solution as an absorption liquid to supply heat source fluids (high temperature / high pressure steam, high temperature water, etc.). The high temperature regenerator 1 in which the heat source supply pipe 2 is piped through the inside, generates a refrigerant vapor by heating the rare water solution (hereinafter referred to as "dilution"), and concentrates the intermediate absorption liquid (hereinafter referred to as "intermediate liquid"). And a low temperature regenerator (3) for heating the intermediate liquid by the steam refrigerant to form a concentrated absorption liquid (hereinafter referred to as "concentrate"), and a refrigerant vapor supplied from the low temperature regenerator (3) flowing through the cooling water pipe (22). The upper body 5 which has the condenser 4 which heat-exchanges with cooling water, and cools and condenses, and the lower body 8 which contains the evaporator 6 and the absorber 7 are provided. The cooling water pipe 22 is disposed in the condenser 4 via the absorber 7 of the lower body 8.

The sprayer 6A provided in the upper part of the evaporator 6 inside the lower body 8 is connected to the terminal end side of the refrigerant pipe 21 with the refrigerant pump 11 interposed in the middle and the start end connected to the lower part of the evaporator 6. The brine tube in which brine, such as water, flows through the inside of the refrigerant liquid stored in the lower part of the evaporator 6 by the sprayer 6A through the refrigerant pipe 21 by the operation of the refrigerant pump 11 ( 23) It is comprised so that application is possible.

Then, the rare liquid pipe 15 extending from the lower side of the absorber 7 of the lower body 8 with the absorbent liquid pump 12 interposed therebetween is formed of a first rare liquid pipe 15A (first rare absorbent liquid pipe 15A) and Branched into 2 rare tube 15B (second rare absorbing liquid tube 15B), each of the first rare tube 15A and the second rare tube 15B is connected to and connected to the high temperature regenerator 1. .

15 A of 1st rare pipes are the control valve 27 which controls the flow volume of the dilute liquid which distribute | circulates in this 1st rare tube 15A, and the absorption liquid reclaimed by the high temperature regenerator 1, and distribute | circulated to the condenser 4 Mounted in the pipe (19) interposed in the refrigerant drain heat recovery device 24 for performing heat exchange with the refrigerant vapor, and the heat source fluid pipe (2) after the high temperature regenerator (1) through the heat source fluid pipe (2) The first heat recovery device 25 and the second heat recovery device 26, which perform heat exchange with the heat source fluid, are interposed, and are disposed downstream of the refrigerant drain heat recovery device 24, that is, near the high temperature regenerator 1, The 2nd heat recovery machine 26 and the 1st heat exchanger 25 are sequentially arrange | positioned on 15 A of rare liquid tubes. Thereby, heat exchange with the heat source fluid which distribute | circulated the high temperature regenerator is performed by the 1st heat recovery machine 25 and the 2nd heat recovery machine 26 sequentially as mentioned later, and heat recovery is performed from the said heat source fluid.

In addition, the second lean tube 15B is provided with a control valve 28 at the inlet side, from the lower side of the low temperature regenerator 3 to the sprinkler 7A provided inside the absorber 7 inside the lower body 8. The low temperature heat exchanger 9 interposed in the absorbing liquid tube 17 to be connected, and the high temperature heat exchanger interposed in the absorbing liquid tube 16 through which the intermediate liquid generated in the high temperature regenerator 1 flows to the low temperature regenerator 3. 10 is sequentially interposed. The control valves 27 and 28 are provided immediately after branching of the rare liquid pipe 15 into the first rare liquid pipe 15A and the second rare liquid pipe 15B.

The flow rate of the first rare liquid pipe 15A and the second rare liquid pipe 15B is stored in the rare liquid stored in the lower side of the absorber 7 in accordance with the operation of the absorption liquid pump 12 and the opening degree of the control valves 27 and 28. Is controlled to be transported to the high temperature regenerator 1.

In addition, the high temperature regenerator 1 and the low temperature regenerator 3 are connected to each other by an absorbing liquid tube 16 through which the high temperature heat exchanger 10 is interposed, and the intermediate liquid in which the refrigerant is separated from the high temperature regenerator 1 by vapor separation. The silver absorption liquid tube 16 is sent to the low temperature regenerator 3.

In addition, the high temperature regenerator 1 and the condenser 4 are connected via the inside of the low temperature regenerator 3 by a coolant tube 19 having a refrigerant drain heat recovery 24 interposed therebetween, so that the high temperature regenerator 1 The vapor coolant, which is heated by the heat source fluid and is evaporated and separated from the absorbent liquid, can be introduced into the condenser 4 via the low temperature regenerator 3.

In addition, the lower side of the low temperature regenerator 3 and the spreader 7A provided in the upper part inside the absorber 7 of the lower body 8 are connected by an absorbing liquid tube 17 through which the low temperature heat exchanger 9 is interposed. The concentrated liquid regenerated so that the refrigerant can be absorbed by the low temperature regenerator 3 is configured to radiate heat into the absorbent 7 through the low temperature heat exchanger 9 as a circulating fluid flowing in the second rare liquid pipe 15B. .

In the absorption chiller 100 of the present invention having the above structure, when the steam shutoff valve 18 that opens and closes the heat source supply pipe 2 is opened, and the heat source fluid flows through the heat source fluid pipe 2, the high temperature regenerator 1 The dilute solution in) is heated by the heat source fluid to obtain a refrigerant vapor which is boiled and evaporated and separated from the dilute solution, and an intermediate liquid in which the refrigerant is vapor separated to increase the concentration of the absorbing liquid.

In this way, the hot refrigerant vapor generated in the high temperature regenerator 1 enters the low temperature regenerator 3 through the coolant tube 19, and further adds the intermediate liquid introduced into the low temperature regenerator 3 through the absorbent liquid tube 16. At the same time as the heating, the rare liquid flowing through the first rare liquid pipe 15A is heated by the refrigerant drain heat recovery unit 24, heat radiated and condensed, and flows into the condenser 4. On the other hand, the absorbent liquid (intermediate liquid) produced by the high temperature regenerator 1 heats the rare liquid which distribute | circulates the 2nd rare liquid pipe 15B via the high temperature heat exchanger 10 by the absorbent liquid tube 16, and heats up the low temperature regenerator 3 Enter).

In addition, the refrigerant vapor heated by the refrigerant vapor flowing in the refrigerant pipe 19 in the low temperature regenerator 3 and separated by evaporation from the intermediate liquid enters the adjacent condenser 4 through the eliminator 13, Heat exchanged with the cooling water flowing in the cooling water pipe 22 to condense and liquefy, merge with the refrigerant supplied by condensation from the refrigerant pipe 19, and distribute the refrigerant pipe 20 to the evaporator 6 of the lower body 8. Inflow.

The refrigerant liquid entering the evaporator 6 and stored in the lower part is sprayed onto the brine tube 23 from the sprayer 6A of the evaporator 6 by the refrigerant pump 11, and is supplied through the brine tube 23. Heat is removed from the brine of the back and evaporated to cool the brine flowing through the inside of the brine tube 23.

The refrigerant evaporated by the evaporator 6 enters the adjacent absorbers 7 through the eliminator 14 and is concentrated and regenerated by absorbing the refrigerant in the low temperature regenerator 3 (that is, the absorbent liquid pipe). (17) is supplied via the low temperature heat exchanger (9), and is absorbed by the absorption liquid (concentrate) sprayed from the spreader (7A) on the cooling water pipe (22).

Then, the absorbent liquid absorbing the refrigerant through the absorber 7 and the concentration thereof, that is, the rare liquid, flows out into the rare liquid pipe 15 by the operation of the absorbent liquid pump 12, and according to the opening degree of the control valves 27 and 28. It is controlled and classified into 15 A of 1st liquid tubes and 15 B of 2nd liquid tubes, and these 1st liquid tubes 15A and 2nd liquid tubes 15B are circulated, and it flows into the high temperature regenerator 1, respectively.

The coolant which flowed in from the one of the rare pipes 15 through the control valve 27 to the first rare pipe 15A is the refrigerant vapor evaporated and separated from the absorbing liquid by the high temperature regenerator 1 in the refrigerant drain heat recovery unit 24. By a heat source fluid which is heated by the second heat recovery device 26 and the first heat recovery device 25 and flows through the inside of the heat source fluid pipe 2 and stores the absorption liquid stored in the high temperature regenerator 1. It is heated and introduced to the high temperature regenerator 1.

The rare liquid which flowed in from the other rare tube 15 into the 2nd rare tube 15B through the control valve 28 is carried out by the low pressure absorber 7A from the lower side of the cold regenerator 3 in the low temperature heat exchanger 9. Heated by an intermediate liquid supplied to the low temperature regenerator 3 through the absorbent liquid tube 16 and heated by the concentrated liquid supplied to the high temperature regenerator 10. Flows into.

In the present invention, the heat recovery device provided on the first rare tube 15A is divided into two, the first heat recovery device 25 and the second heat recovery device 26, and the heat source fluid in which the high temperature regenerator 1 is distributed is provided. The first heat recovery device 25 is distributed and distributed to the second heat recovery device 26 via the steam trap 21. Before and after the steam trap 21, this heat divider is divided | segmented into steam and drain (steam | condensed water). In other words, the latent heat and sensible heat of the heat source fluid (steam and drain) are recovered by the first heat recovery device 25, and the sensible heat is recovered by the second heat recovery device 26.

For example, in the case where the heat recoverer provided on the first rare pipe 15A is not divided in this way, the entire portion through which the heat source fluid flows is designed for high pressure, and the heat recoverer also becomes a high pressure container, which becomes large and increases costs. Cause. However, in the present invention, as described above, by dividing the heat recovery device, the configuration after the steam trap 21 is not a high pressure design, so that the design of the heat source fluid line can be simplified, and the first heat recovery device serving as a pressure vessel is provided. (25) can be miniaturized.

Thus, the heat recovery from the heat source fluid of the high temperature and high pressure steam which distribute | circulates in the heat source fluid pipe 2 is efficiently performed by achieving the miniaturization of a heat recovery machine, and having few components and a simplified piping, and a heat source The heat recovery efficiency from the fluid is improved, and the device efficiency can be improved. Moreover, since adjustment of the dilute liquid which distribute | circulates the branched 1st rare tube 15A and the 2nd rare tube 15B can be performed independently, adjustment is easy, and the heat recovery efficiency from a heat source fluid can be improved, and an apparatus It is possible to improve the efficiency.

In addition, a coolant drain heat recovery device 24 is provided in which the rare water absorbing liquid flowing through the first rare liquid pipe 15A and flowing to the high temperature regenerator 1 and the coolant liquid flowing through the low temperature regenerator 3 and heat-condensing are heat-exchanged. Thus, the low temperature regenerator 3 is circulated to perform heat recovery from the heat-condensed refrigerant liquid, and at the same time, heat recovery from the heat source fluid circulating in the heat source fluid pipe 2 can be performed. The second heat recovery device 26 and the coolant drain heat recovery device 24 make it possible to effectively recover heat from the heat source fluid to the rare absorption liquid, thereby improving the efficiency of the absorption refrigeration apparatus.

By circulating the refrigerant and the absorbent liquid as described above, brine such as water cooled by the heat of vaporization of the refrigerant in the brine tube 23 provided via the inside of the evaporator 6 is not shown through the brine tube 23. Since it can circulate and supply to an air conditioning load, cooling operation, such as cooling, can be performed.

Then, the heat source of the heat source fluid that heats the absorbing liquid in the high temperature regenerator 1 is classified into a first rare tube 15A and a second rare tube 15B for the rare liquid supplied to the high temperature regenerator 1, respectively. By being used for heating, the low temperature region of the heat source fluid can be used, and the amount of steam consumed can be reduced, and the crystal margin of the low temperature heat exchanger 9 is increased. has exist). Further, the rare tube 15 which communicates from the absorber 7 to the high temperature regenerator 1 is branched into the first rare tube 15A and the second rare tube 15B as described above, and these rare tube are directly stored as described above. Since the high temperature regenerator 1 communicates with each other, it is possible to easily adjust the fractionation distribution of the diluted liquid flowing through each of the branched diluted liquid tubes.

In the absorption chiller 100 of the present invention, as shown in FIG. 2, the low temperature regenerator 3, the upper body 5 incorporating the condenser 4, and the high temperature regenerator 1 are disposed on the upper portion, Since the lower body 8 incorporating the evaporator 6 and the absorber 7 is disposed below, it is an absorption chiller suitable for miniaturization in which the dimension in the height direction is suppressed.

In addition, since the lower body 8 is provided in parallel with the evaporator and the absorber in the same manner as in the prior art, the internal structure is not complicated.

This invention is not limited to the said embodiment, It can change suitably in the range which does not deviate from the meaning of this invention, and is suitable for the absorption type refrigerator which improves the efficiency of an apparatus by heat recovery from a heat source.

1 is a piping configuration diagram of the absorption chiller according to the present invention.

2 is an external configuration diagram of an absorption type refrigerator according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: high temperature regenerator

2: heat source fluid tube

3: low temperature regenerator

4: condenser

5: upper body

6: evaporator

7: absorber

8: lower body

9: low temperature heat exchanger

10: high temperature heat exchanger

11: refrigerant pump

12: absorbent pump

13, 14: eliminator

15: rare tube

15A: first rare tube

15B: Second rare tube

16, 17: absorption liquid pipe

18: steam shutoff valve

19, 20, 21: refrigerant pipe

22: cooling water pipe

23: brine tube

24: refrigerant drain heat recovery machine

25: first heat recovery machine

26: second heat recovery machine

27, 28: control valve

100: Absorption Chiller

Claims (2)

A high temperature regenerator for circulating a heat source fluid to heat the rare absorbent liquid to generate refrigerant vapor and intermediate absorbent liquid, a low temperature regenerator for reheating the intermediate absorbent liquid with the generated refrigerant vapor to generate refrigerant vapor and concentrated absorbent liquid, and the high temperature regenerator Condensing and condensing the refrigerant vapor generated in the refrigerant vapor generated in the low temperature regenerator and the refrigerant liquid condensed through the low temperature regenerator; and spraying the refrigerant liquid from the condenser on a cold water pipe. An evaporator for evaporating again to enable the supply of cold heat to the heat load, and an absorption chiller having an absorber for introducing a concentrated absorbent liquid from the low temperature regenerator and absorbing the refrigerant vapor from the evaporator into the concentrated absorbent liquid to generate a rare absorbent liquid. In The rare absorbing liquid pipe installed in communication with the high temperature regenerator from the absorber and branched from the absorber liquid to the first rare absorbing liquid pipe and the second rare absorbing liquid pipe, respectively, each of the first rare absorbing liquid pipe and the second rare absorbing liquid pipe. Is installed in communication with the high temperature regenerator, the first rare water absorbing tube is provided with a heat recoverer for performing heat exchange with a heat source fluid passed through the high temperature regenerator, and the second rare water absorbing tube is formed with an intermediate produced by the high temperature regenerator. And a high temperature heat exchanger for exchanging heat with the absorbent liquid and a low temperature heat exchanger for exchanging heat with the concentrated absorbent liquid generated in the low temperature regenerator, wherein the heat recovery unit is divided into at least two of the first heat recovery unit and the second heat recovery unit. The heat source fluid passed through the high temperature regenerator flows through the first heat recoverer and passes through the steam trap to the second heat recoverer. Absorption type refrigerator characterized in that. The heat absorber according to claim 1, wherein the rare water absorbing liquid flows through the first rare water absorbing tube through a high temperature regenerator and the low temperature regenerator flows into the absorber side of the heat recoverer provided on the first rare water absorbing tube. An absorption chiller, wherein the refrigerant liquid is provided with a refrigerant drain heat recovery unit for performing heat exchange.

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