JP2003287315A - Absorption refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the thermal efficiency of an absorption refrigerating machine. <P>SOLUTION: The absorption refrigerating machine has a refrigerant heat collector 11 in which intermediate absorbent is heated and subjected to the heat radiation condensation by a low-temperature regenerator 3, and heat exchange is performed between the refrigerant introduced in a condenser 4 via a refrigerant pipe 19 and a part of dilute absorbent transmitted to a high- temperature regenerator 1, and a flow rate control valve 29 to give the flow passage resistance to a refrigerant pipe 19. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator having excellent thermal efficiency.

[0002]

2. Description of the Related Art As shown in FIG. 3, exhaust gas discharged from a gas burner 2 for heating and boiling a rare absorbent of a high temperature regenerator 1 is fed to a high temperature heat exchanger 10 of a liquid absorbent pipe 12 and a high temperature regenerator 1. To the first exhaust gas heat recovery unit 26 provided between the low temperature heat exchanger 9 and the high temperature heat exchanger 10, and sequentially sent from the absorber 7 to the high temperature. Absorption refrigerators are known in which the temperature of the rare absorbent conveyed to the regenerator 1 is raised, the heating amount required by the gas burner 2 is reduced, and the fuel consumption is reduced.

That is, in the absorption refrigerating machine having the above-mentioned structure, the rare absorption liquid discharged from the absorber 7 at about 40 ° C. (during rated operation, the same applies hereinafter) is used for the low temperature heat exchanger 9 and the second exhaust gas heat recovery device. 27, the high temperature heat exchanger 10 and the first exhaust gas heat exchanger 26 are respectively heated, and the temperature rises around 135 ° C. and flows into the high temperature regenerator 1, so that the fuel consumed by the gas burner 2 can be saved.

When the temperature of the exhaust gas from the gas burner 2 and the temperature of the rare absorbent supplied from the absorber 7 are both low, the opening of the flow control valve 28 is increased and the rare absorbent flowing into the absorbent pipe 14 is opened. The amount of liquid is increased, the heat recovery from the exhaust gas in the second exhaust gas heat recovery device 27 is reduced to prevent the exhaust gas temperature from remarkably lowering, and to prevent condensation and dew condensation of water vapor contained in the exhaust gas. There is.

However, in the conventional absorption refrigerator, the flow control valve 28 is provided in the absorption liquid pipe 14 that bypasses the second exhaust gas heat recovery device 27, so the flow control valve 2
Even when 8 was fully opened, the amount of the rare absorption liquid flowing through the absorption liquid pipe 14 to the second exhaust gas heat recovery device 27 was not small.

Therefore, when the temperature of the exhaust gas and the rare absorption liquid are both low at the start of operation, the temperature of the exhaust gas is too low even if the flow control valve is fully opened, and the water vapor contained in the exhaust gas is condensed and condensed to generate heat. The exchanger and the exhaust pipe were sometimes corroded.

[0007]

Further, most of the heat retained in the exhaust gas from the gas burner is completely recovered,
Even if the heat recovery from the exhaust gas is further attempted, the temperature of the exhaust gas may drop below the temperature of the water vapor contained in the exhaust gas even when the operation is not started, and dew condensation may corrode the heat recovery device and the piping. Therefore, it is necessary to further improve the thermal efficiency by another method, which has been a problem to be solved.

[0008]

In order to solve the above-mentioned problems of the prior art, the present invention is a high-temperature regenerator for obtaining a refrigerant vapor and an intermediate absorption liquid from a rare absorption liquid by heating and boiling in a combustion device to evaporate and separate the refrigerant. And the intermediate absorption liquid generated and supplied by this high temperature regenerator is heated by the refrigerant vapor generated by the high temperature regenerator to further evaporate and separate the refrigerant, and low temperature regeneration to obtain the refrigerant vapor and the concentrated absorption liquid from the intermediate absorption liquid. And a condenser for heating the intermediate absorption liquid in this low temperature regenerator and supplying the condensed refrigerant liquid, and for cooling the refrigerant vapor generated and supplied in the low temperature regenerator to obtain the refrigerant liquid, and The refrigerant liquid supplied from the condenser is scattered on the heat transfer tubes, and the evaporator that takes heat from the fluid flowing in the heat transfer tubes to evaporate the refrigerant and the refrigerant vapor that is generated and supplied by this evaporator are cooled to a low temperature. Concentrated absorption liquid supplied by separating the refrigerant vapor from the regenerator Absorber that absorbs it into a rare absorbent and supplies it to the high temperature regenerator, a low temperature heat exchanger that exchanges heat between the rare absorbent and concentrated absorbent that flow in and out of this absorber, and an intermediate absorption that flows in and out of the high temperature regenerator. In an absorption chiller equipped with a high-temperature heat exchanger that exchanges heat between the liquid and the rare absorption liquid, a part of the rare absorption liquid discharged from the absorber radiates heat from the low-temperature regenerator, and the low-temperature heat exchange with the refrigerant is discharged. First, a refrigerant heat recovery device that bypasses the condenser and exchanges heat, and a means that applies flow path resistance to a refrigerant pipe that introduces the refrigerant that radiates heat to the rare absorption liquid in the refrigerant heat recovery device into the condenser are provided. An absorption chiller of the configuration

In the absorption refrigerator having the first structure,
An absorption refrigerator having a second configuration in which a refrigerant pipe is arranged so that the refrigerant discharged from the refrigerant heat recovery device can be introduced into the evaporator instead of the condenser,

In the absorption refrigerating machine of the first or second construction, the means for providing the flow path resistance provided in the refrigerant pipe is a variable resistance member, and the temperature of the refrigerant discharged from the refrigerant heat recovery device is rare. Pre-heat exchange temperature of absorbing liquid + predetermined temperature α (where α>
And an absorption refrigerator having a third structure in which the flow path resistance of the flow path resistance variable member is controlled so as to be 0).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to an absorption refrigerator having water as a refrigerant and an aqueous lithium bromide (LiBr) solution as an absorbing liquid.

An embodiment of the present invention will be described with reference to FIG. In the figure, 1 is a high temperature regenerator configured to heat the absorbing liquid by heating power of a gas burner 2 that uses city gas as fuel to evaporate and separate the refrigerant, 3 is a low temperature regenerator, 4
Is a condenser, 5 is a high temperature cylinder housing the low temperature regenerator 3 and the condenser 4, 6 is an evaporator, 7 is an absorber, 8 is a low temperature cylinder containing the evaporator 6 and the absorber 7, 9 Is a low temperature heat exchanger, 1
0 is a high temperature heat exchanger, 11 is a refrigerant heat recovery device, 12 to 16 are absorption liquid pipes, 17 and 18 are absorption liquid pumps, 19 to 21 are refrigerant pipes, 22 is a refrigerant pump, 23 is a cold water pipe, and 24 is a cooling pipe. A water pipe, 25 is an exhaust pipe through which exhaust gas from the gas burner 2 passes,
Reference numeral 26 is a first exhaust gas heat recovery device, 27 is a second exhaust gas heat recovery device, and 28 is a second exhaust gas downstream from the branch portion with the absorption liquid pipe 14.
Of the exhaust gas heat recovery device 27, the flow control valve provided in the absorption liquid pipe 12 on the upstream side, and 29 is the refrigerant heat recovery device 1 of the refrigerant pipe 19.
1, a flow control valve provided on the downstream side of 1, and 30 is an exhaust pipe 2
5, a temperature sensor for detecting the temperature of the exhaust gas, which is provided in the downstream portion of 5, and a temperature sensor 31, which is provided in the upstream portion of the absorption liquid pipe 12, for detecting the temperature of the rare absorption liquid before heat exchange, 3
2 is provided in the downstream portion of the refrigerant pipe 19 and is provided in the refrigerant heat recovery unit 1.
A temperature sensor for detecting the temperature of the refrigerant that has exchanged heat with the rare absorption liquid in 1 and radiates heat, and 33 controls the opening degree of the flow control valve 28 so that the temperature sensor 30 continues to detect a predetermined temperature, for example, 100 ° C. At the same time, the opening of the flow control valve 29 is adjusted so that the temperature detected by the temperature sensor 32 becomes the temperature detected by the temperature sensor 31 + the predetermined temperature α (where α> 0), and the flow path of the refrigerant pipe 19 is adjusted. It is a controller for controlling the resistance.

In the absorption refrigerator having the above-mentioned structure, when the city gas is burned in the gas burner 2 and the rare absorbent is heated and boiled in the high temperature regenerator 1, the refrigerant vapor evaporated and separated from the rare absorbent and the refrigerant vapor are separated. An intermediate absorbent having a high concentration of the absorbent is obtained by separation.

The high-temperature refrigerant vapor generated in the high-temperature regenerator 1 enters the low-temperature regenerator 3 through the upstream portion of the refrigerant pipe 19, and is generated in the high-temperature regenerator 1 and absorbed by the absorption liquid pipe 15 to the high-temperature heat exchanger 10. The intermediate absorption liquid that has entered the low-temperature regenerator 3 via is heated and condensed by heat radiation, and enters the condenser 4 through the downstream portion of the refrigerant pipe 19 in which the refrigerant heat recovery device 11 is interposed.

The refrigerant heated by the low temperature regenerator 3 and evaporated and separated from the intermediate absorption liquid enters the condenser 4, and the cooling water pipe 2
4 heat-exchanges with the water flowing in the condenser 4, liquefies and condenses, and together with the refrigerant condensed and supplied from the refrigerant pipe 19, passes through the refrigerant pipe 20 and enters the evaporator 6.

The refrigerant liquid accumulated at the bottom of the evaporator 6 is sprayed on the heat transfer pipe 23A connected to the cold water pipe 23 by the refrigerant pump 22 interposed in the refrigerant pipe 21 and supplied through the cold water pipe 23. It exchanges heat with water to evaporate and cools the water flowing inside the heat transfer tube 23A.

The refrigerant evaporated in the evaporator 6 enters the absorber 7, is heated in the low temperature regenerator 3 to evaporate and separate the refrigerant, and the absorption liquid having a higher concentration of the absorption liquid, that is, the absorption liquid pipe 16
Is supplied by the absorption liquid pump 18 via the low temperature heat exchanger 9 and absorbed by the concentrated absorption liquid sprayed from above.

Then, the absorbing liquid whose concentration has been reduced by absorbing the refrigerant in the absorber 7, that is, the rare absorbing liquid is absorbed by the absorbing liquid pump 1.
It is returned to the high temperature regenerator 1 by the operation of 7.

When the absorption refrigerator is operated as described above, the cold water cooled by the heat of vaporization of the refrigerant in the heat transfer tube 23A arranged inside the evaporator 6 is cooled by the cold water tube 23.
Since it can be circulated and supplied to an air-conditioning load (not shown) via, the cooling operation such as cooling can be performed.

In the absorption refrigerator having the above-mentioned structure, a part of the rare absorption liquid returned from the absorber 7 to the high-temperature regenerator 1 by the operation of the absorption liquid pump 17 is interposed in the absorption liquid pipe 12 to the low temperature heat exchanger 9 Through the refrigerant heat recovery device 11 interposed in the absorption liquid pipe 13 and is heated in each heat exchanger.

The amount of the rare absorption liquid heated by the exhaust gas from the gas burner 2 via the second exhaust gas heat recovery unit 27 is controlled by the flow rate control valve 28 interposed in the absorption liquid pipe 12, and the high temperature heat The entire amount of the rare absorption liquid returned from the absorber 7 to the high temperature regenerator 1 flows through the exchanger 10 and the first exhaust gas heat recovery device 26 and is heated by each.

That is, a part of the dilute absorption liquid of about 40 ° C. discharged from the absorber 7 to the absorption liquid pipe 12 is discharged from the low temperature regenerator 3 to the absorption liquid pipe 16 and flows to the absorber 7 about 90 ° C. ℃
The heat is exchanged with the concentrated absorbing liquid in the low temperature heat exchanger 9, and the rest is condensed in the low temperature regenerator 3 and exchanges heat with the refrigerant liquid of about 95 ° C. in the refrigerant pipe 19 flowing into the condenser 4.

Since a flow rate control valve 29, which serves as a flow path resistance, is installed in the downstream portion of the refrigerant pipe 19 to reduce the flow velocity of the refrigerant, heat is radiated and condensed in the intermediate absorption liquid in the low temperature regenerator 3 to condense the refrigerant. The gas-liquid two-phase refrigerant discharged into the pipe 19 is the refrigerant heat recovery device 1
By the time the temperature reaches 1, only the liquid phase remains, and the heat exchange efficiency between the refrigerant and the rare absorption liquid in the refrigerant heat recovery device 11 is improved.

Moreover, the temperature of the refrigerant after heat exchange in the refrigerant heat exchanger 11 detected by the temperature sensor 32 is, for example, the temperature of the rare absorption liquid before heat exchange in the refrigerant heat exchanger 11 detected by the temperature sensor 31. + The opening degree of the flow control valve 29 is controlled by the controller 33 so that the temperature becomes higher by a predetermined temperature, for example, 5 ° C., the rare absorbent sent from the absorber 7 to the high temperature regenerator 1 is heated, and the low temperature regenerator is generated. The refrigerant sent from 3 to the condenser 4 is cooled.

The low temperature heat exchanger 9 and the refrigerant heat recovery unit 1
1. The rare absorbents that have been heat-exchanged and heated are joined together,
For example, it becomes a rare absorption liquid at around 80 ° C. and flows into the second exhaust gas heat recovery unit 27.

Further, the flow rate of the rare absorption liquid flowing into the second exhaust gas heat recovery device 27 is controlled by the controller 33 by adjusting the opening degree of the flow control valve 28 interposed in the absorption liquid pipe 12. For example, the controller 33 increases the opening degree of the flow rate control valve 28 when the temperature sensor 30 detects a temperature higher than a predetermined temperature of 100 ° C. to reduce the amount of the rare absorption liquid returned from the absorber 7 to the high temperature regenerator 1. Since more is supplied to the second heat recovery unit 27 to promote recovery of heat contained in the exhaust gas, thermal efficiency is improved and fuel consumption of the gas burner 2 is suppressed.

Moreover, when the temperature sensor 30 detects a temperature lower than 100 ° C., the total amount of the dilute absorption liquid becomes the second amount.
Since it is possible to suppress the amount of heat recovered from the exhaust gas to a maximum of zero by squeezing the flow rate control valve 28 to the maximum fully closed until it bypasses the exhaust gas heat recovery device 27 and flows to the absorption liquid pipe 14, The temperature of the exhaust gas exhausted through the exhaust gas is higher than the dew point temperature (the dew point temperature of the combustion exhaust gas when city gas, that is, natural gas is used as fuel is 60 to 70 ° C.), which is 100.
Therefore, even when the exhaust gas temperature is low and the exhaust gas temperature is low, the steam contained in the exhaust gas does not condense to generate drain water and the corrosion problem caused by drain water does not occur.

The rare absorbent which has been heated via the second exhaust gas heat recovery device 27 and the rare absorbent which has not passed through the second exhaust gas heat recovery device 27 and therefore has not been heated join together to form a high temperature. The intermediate absorption liquid flowing from the high temperature regenerator 1 to the low temperature regenerator 3 via the absorption liquid pipe 15 via the heat exchanger 10 and the first exhaust gas heat recovery device 26, and about the amount discharged from the gas burner 2 Since it exchanges heat with the exhaust gas of 200 ° C. and becomes a rare absorption liquid of about 135 ° C. and flows into the high temperature regenerator 1, the fuel consumed by the gas burner 2 can be saved.

Further, the refrigerant liquid condensed in the low temperature regenerator 3 and flowing into the condenser 4 through the downstream portion of the refrigerant pipe 19 is, as described above, a rare absorption liquid of about 40 ° C. in the refrigerant heat recovery device 11. The heat is exchanged to heat it, the refrigerant itself is cooled to about 45 ° C., and the amount of heat radiated to the cooling water flowing through the inside of the cooling water pipe 24 decreases, so that the required heat input in the high temperature regenerator 1 can be reduced. Also in this respect, the thermal efficiency of the absorption refrigerator is significantly improved.

The temperature of the refrigerant that heats the intermediate absorption liquid by the low-temperature regenerator 3 to radiate the heat and further heats the rare absorption liquid by the refrigerant heat recovery device 11 to radiate the heat is lowered to about 45 ° C. as described above. Therefore, the cooling water pipe 24 is sent to the condenser 4.
It is not necessary to cool with the cooling water flowing inside.

Therefore, the downstream side of the refrigerant pipe 19 is the condenser 4
Instead, it is possible to connect the condensed refrigerant so that it can flow into the evaporator 6 as indicated by a phantom line, thereby shortening the pipe length and simplifying the piping configuration (in FIG. 1, a drawing of the refrigerant pipes 19 and 20 is shown. Although the uppermost shortest part is connected by an imaginary line, in the actual device, the high temperature cylinder 5 is located above, and the low temperature cylinder 8 and the refrigerant heat recovery device 1 are connected.
Since it is located below 1, the evaporator 6 of the low temperature cylinder 8 and the refrigerant heat recovery device 11 can be brought close to each other and can be connected by a short refrigerant pipe. ).

Further, since the present invention is not limited to the above embodiment, various modifications can be made without departing from the scope of the claims.

For example, the flow rate control valve 29 of the refrigerant pipe 19 is
Since it is provided as a means for adjusting the flow path resistance of the refrigerant pipe 19, it is possible to install an inexpensive orifice in place of the expensive flow control valve 29.

Further, instead of the expensive flow control valve 28, an inexpensive opening / closing valve is used as the absorbing liquid pipe 14 on the upstream side of the second heat recovery device 27.
Installed at the same location, or an inexpensive switching valve is installed in the absorption liquid pipes 12, 1
The exhaust gas temperature detected by the temperature sensor 30 is set to a predetermined temperature, for example, 1
The controller 33 may be configured to control opening / closing and switching of the valve so that the temperature does not fall below 00 ° C.

Further, instead of the absorbing liquid pipe 14 bypassing the second heat recovery device 27, as shown in FIG. 2, an exhaust pipe 25A bypassing the second heat recovery device 27 is provided and its exhaust gas is exhausted. A flow path switching valve 28A is provided at a branching portion (or a joining portion) with the pipe 25A. Alternatively, by providing an opening / closing valve in the exhaust pipe 25 passing through the second heat recovery device 27, the temperature of the exhaust gas that has flowed into the second heat recovery device 27 and exchanged heat with the rare absorption liquid is higher than a predetermined temperature of 100 ° C. The controller 33 may control opening / closing and switching of the valve so as not to decrease.

Further, the absorption refrigerator may be one exclusively for cooling operation such as cooling as described above, or the refrigerant vapor generated by heating in the high temperature regenerator 1 and the refrigerant vapor are separated by evaporation. A pipe connection is provided so that the absorbing liquid can be directly supplied to the low temperature cylinder 8, the rare absorbing liquid is heated by the gas burner 2 without flowing the cooling water into the cooling water pipe 24, and the heat transfer pipe 23A of the evaporator 6 is heated to, for example, about 55 ° C. Alternatively, the heating water may be circulated and supplied to the load through a cold water pipe (preferably referred to as a hot water pipe when hot water circulates) 23 so that heating operation such as heating can be performed.

As the fluid to be supplied to the air-conditioning load after being cooled by the evaporator 6, water or the like is supplied without phase change as in the above-described embodiment, and heat transfer using latent heat is possible. Alternatively, CFCs may be phase-changed and supplied.

[0038]

As described above, according to the present invention, the means for imparting flow path resistance to the refrigerant pipe for introducing the refrigerant that has radiated heat to the rare absorption liquid in the refrigerant heat recovery device into the condenser is provided. , The flow velocity of the refrigerant flowing through the refrigerant pipe decreases, the heat is dissipated to the intermediate absorption liquid in the low temperature regenerator and condensed, and the gas-liquid two-phase refrigerant discharged to the refrigerant pipe reaches the refrigerant heat recovery device in the liquid phase. Therefore, the efficiency of heat exchange between the refrigerant and the rare absorption liquid in the refrigerant heat recovery device is improved.

Further, in an absorption refrigerator having a refrigerant pipe arranged so that the refrigerant discharged from the refrigerant heat recovery device can be introduced into the evaporator instead of the condenser, the length of the refrigerant pipe can be shortened and the piping structure can be simplified. Is possible.

Further, the means for providing the flow path resistance provided in the refrigerant pipe is the variable resistance member, and the temperature of the refrigerant discharged from the refrigerant heat recovery device is equal to the temperature before heat exchange of the rare absorption liquid + the predetermined temperature α (however, , Α> 0), the flow path resistance of the flow path resistance variable member is controlled so that the heat of the refrigerant is ensured by the rare absorption liquid that is sent from the absorber to the high temperature regenerator. It is possible to reduce the retained heat of the refrigerant which is recovered by the condenser and radiates heat in the condenser.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a modified embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

1 High temperature regenerator 2 gas burners 3 low temperature regenerator 4 condenser 5 hot body 6 evaporator 7 absorber 8 low temperature body 9 Low temperature heat exchanger 10 High temperature heat exchanger 11 Refrigerant heat recovery unit 12-16 Absorption liquid tube 17, 18 Absorption liquid pump 19-21 Refrigerant tube 22 Refrigerant pump 23 Cold water pipe 24 Cooling water pipe 25 exhaust pipe 26 First exhaust gas heat recovery unit 27 Second exhaust gas heat recovery device 28 Flow control valve 28A switching valve 29 Flow control valve 30-32 Temperature sensor 33 Controller

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ira Minoru Kazuyasu             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Shioku Yamazaki             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Yasushi Kamata             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F term (reference) 3L093 AA01 BB11 BB22 BB29 BB37                       CC00 DD08 EE09 GG02 HH08                       JJ02 KK03 LL03

Claims (3)

[Claims] 1. A high-temperature regenerator for heating and boiling in a combustion device to evaporate and separate a refrigerant to obtain a refrigerant vapor and an intermediate absorption liquid from a rare absorption liquid, and an intermediate absorption liquid generated and supplied by the high-temperature regenerator. A low-temperature regenerator that heats the refrigerant vapor generated in the high-temperature regenerator to further evaporate and separate the refrigerant to obtain the refrigerant vapor and concentrated absorbent from the intermediate absorption liquid, and the intermediate absorption liquid is heated and condensed in this low-temperature regenerator. A refrigerant liquid is supplied, a condenser that cools the refrigerant vapor generated and supplied by the low temperature regenerator to obtain a refrigerant liquid, and the refrigerant liquid supplied from this condenser is sprayed on the heat transfer tubes, The evaporator that takes heat from the fluid flowing in the heat transfer tube to evaporate the refrigerant and the refrigerant vapor that is generated and supplied by this evaporator are separated from the refrigerant vapor from the low-temperature regenerator and absorbed by the concentrated absorbing liquid that is supplied. The absorber that supplies the high temperature regenerator with diluted absorbent Equipped with a low temperature heat exchanger that exchanges heat between the rare absorbent and the concentrated absorbent that enter and leave the absorber, and a high temperature heat exchanger that exchanges heat between the intermediate absorbent and the rare absorbent that enter and exit the high temperature regenerator. In the absorption chiller, a part of the rare absorbent discharged from the absorber radiates heat from the low temperature regenerator and is discharged, and a refrigerant heat recovery device that bypasses the low temperature heat exchanger and exchanges heat.
An absorption refrigerating machine, which is provided with means for imparting flow path resistance to a refrigerant pipe that introduces a refrigerant that radiates heat to a rare absorption liquid in a refrigerant heat recovery device into a condenser. 2. The absorption refrigerator according to claim 1, wherein a refrigerant pipe is arranged so that the refrigerant discharged from the refrigerant heat recovery device can be introduced into the evaporator instead of the condenser. 3. A variable resistance member is provided in the refrigerant pipe to provide flow resistance, and the temperature of the refrigerant discharged from the refrigerant heat recovery device is equal to the temperature before heat exchange of the rare absorption liquid + predetermined temperature α (however). ,
3. The absorption refrigerator according to claim 1, wherein the flow path resistance of the flow path resistance variable member is controlled so that α> 0).