JP4326478B2 - Single double-effect absorption refrigerator - Google Patents

Description

  The present invention relates to a single double-effect absorption refrigerator (including an absorption chiller / heater).

  As this type of absorption refrigerator, for example, as shown in FIG. 2, a high-temperature regenerator 5 that heats the absorption liquid using the combustion heat generated in the gas burner 4 as a heat source and evaporates and separates the refrigerant is supplied from the high-temperature regenerator 5 The refrigerant vapor supplied from the low-temperature regenerator 6 is arranged in parallel with the low-temperature regenerator 6 of the dual-effect regenerator that heats the absorption liquid using the generated refrigerant vapor as a heat source and evaporates and separates the refrigerant. The absorption liquid is heated by using a relatively low temperature hot waste water of, for example, about 80 ° C. supplied from the condenser 7 of the double-effect condenser, the cogeneration device, etc. through the low heat source supply pipe 19, for example. A low heat source regenerator 9 of a single effect regenerator for evaporating and separating, a condenser 10 of a single effect condenser which is provided in parallel to the low heat source regenerator 9 and condenses the refrigerant vapor supplied from the low heat source regenerator 9, a condenser 7 and condenser 10 An evaporator 1 for evaporating the refrigerant liquid to be evaporated, an absorber 2 for absorbing the refrigerant vapor evaporated in the evaporator 1 by the concentrated absorbent supplied from the low-temperature regenerator 6, a rare absorbent pump P1, and an intermediate absorbent pump P2. A single-double-effect absorption refrigerator 100X equipped with a refrigerant pump P4 and the like is well known (see, for example, Patent Document 1).

  In the figure, 12 is a low-temperature heat exchanger, 13 is a high-temperature heat exchanger, 15X is an exhaust heat recovery unit, 17 is a brine (for example, water) for circulating and supplying cold heat or heat to a heat load (not shown) for air conditioning and the like. ) Is a brine pipe flowing inside, and 18 is a cooling water pipe.

  In the absorption chiller 100X having the above-described configuration, the combustion of the gas in the gas burner 4 is stopped from the double-effect operation or the single-double-effect operation, and only the hot waste water supplied from the low heat source supply pipe 19 to the heat transfer pipe 9B is used. When shifting to the single effect operation in which the heat regeneration of the absorption liquid and the generation of the refrigerant vapor are performed, the liquid level of the absorption liquid in the high temperature regenerator 5 gradually decreases due to the residual pressure of the high temperature regenerator 5.

Therefore, the intermediate absorbing liquid pump P2 that is controlled so that the liquid level of the absorbing liquid in the high-temperature regenerator 5 is constant is repeatedly operated and stopped, and is regenerated so that the refrigerant can be absorbed by evaporating and separating the refrigerant to regenerate the low heat source. Since the amount of the absorbing liquid flowing from the vessel 9 into the absorber 2 varies, the amount of the refrigerant absorbed by the absorbing solution in the absorber 2 varies. Therefore, there has been a problem that the amount of refrigerant evaporated in the evaporator 1 fluctuates and the temperature of the brine that is circulated from the evaporator 1 to the heat load fluctuates.
Japanese Patent Laid-Open No. 11-281186

  Therefore, in a single double-effect absorption refrigerator, even when shifting from a double-effect operation or single-double-effect operation to a single-effect operation, the temperature of the brine that is taken out of the evaporator and supplied to the heat load will not fluctuate. It was necessary to solve this, and the solution was an issue.

In order to solve the above problems , the present invention
Evaporator absorber cylinder containing the evaporator and absorber, low temperature regenerator condenser cylinder containing the low temperature regenerator and condenser, low heat source regenerator and condenser using hot wastewater as the heat source. Low heat source regenerator Condenser barrel, high temperature regenerator, low temperature heat exchanger, high temperature heat exchanger, refrigerant pump, absorption liquid pump, etc.
A pressure equalizing pipe in which an on-off valve is interposed between the refrigerant pipe from the high temperature regenerator to the low temperature regenerator and the low heat source regenerator condenser body and / or the condenser of the low heat source regenerator condenser body. Connected by
A single-double-effect absorption refrigerator characterized by opening and closing the on-off valve according to the temperature of the heat source flowing into the low heat source regenerator and the operating state of the gas burner provided in the high temperature regenerator ; ,
In the above single double effect absorption refrigerator,
When the heating of the absorbing liquid in the high-temperature regenerator is stopped and the heating is switched to only heating the absorbing liquid in the low-heat source regenerator of the condenser body of the low-heat source regenerator, the on-off valve of the pressure equalizing pipe With the configuration to open the valve
Is to provide.

  According to the present invention, there is provided an on-off valve for a pressure equalizing pipe connecting a refrigerant vapor pipe from a high temperature regenerator to a low temperature regenerator and a condenser of the low temperature regenerator condenser cylinder and / or the heat source regenerator condenser cylinder. Therefore, the high-temperature and high-pressure refrigerant vapor generated in the high-temperature regenerator dissipates heat to the cooling water and remains in the high-temperature regenerator because the valve is opened when switching from double-effect operation or single-double-effect operation to single-effect operation. The pressure quickly decreases, and the absorbent pump that transports the absorbent to the high-temperature regenerator does not repeat operation and stop.

  Therefore, the amount of absorbing liquid flowing into the absorber from the low heat source regenerator regenerated so that the refrigerant can be absorbed by evaporating and separating the refrigerant is stabilized, and the amount of refrigerant absorbed in the absorbing liquid in the absorber is stabilized. The amount of refrigerant evaporated in the evaporator is stabilized, and the temperature of the brine that is cooled by the evaporator and circulated to the heat load is stabilized.

  Evaporator absorber cylinder containing the evaporator and absorber, low temperature regenerator condenser cylinder containing the low temperature regenerator and condenser, low heat source regenerator and condenser using the hot drain as a heat source. Low heat source regenerator Condenser barrel, high temperature regenerator, low temperature heat exchanger, high temperature heat exchanger, refrigerant pump, absorption liquid pump, etc. The refrigerant vapor pipe leading to the low-temperature regenerator and the low-temperature regenerator condenser cylinder and / or the condenser of the heat source regenerator condenser cylinder are connected by a pressure equalizing pipe with an open / close valve, and the absorption liquid is heated in the high-temperature regenerator. Was stopped, and the switching valve of the pressure equalizing pipe was opened when switching to only heating of the absorption liquid in the low heat source regenerator of the condenser body of the low heat source regenerator.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1A and 1B . Incidentally, order to facilitate understanding, in FIG. 1A · 1B, the portions having the same functions as the portions described in FIG. 2, the same reference numerals are given.

The absorption refrigerator 100 of the present invention illustrated in FIGS. 1A and 1B is a single double-effect absorption chiller / heater using water as a refrigerant and a lithium bromide (LiBr) aqueous solution as an absorption liquid. An evaporator absorber body 3 containing the regenerator 1 and the absorber 2, a high temperature regenerator 5 having a gas burner 4, a low temperature regenerator 6, a condenser 7 juxtaposed to the low temperature regenerator 6, a low temperature regenerator 6, A low-temperature regenerator condenser body 8 containing the condenser 7, a low-heat source regenerator 9 that uses hot wastewater or the like as a heat source, a condenser 10 provided in parallel with the low-heat source regenerator 9, a low-heat source regenerator 9 and a condenser 10, a low heat source regenerator condenser body 11, a low temperature heat exchanger 12, a high temperature heat exchanger 13, a refrigerant drain heat recovery device 14, a first exhaust gas heat recovery device 15, and a second exhaust gas heat recovery device. 16, brine pipe 17 through which the brine (for example, water) flows, cooling water pipe 18, low heat source supply pipe 19, A rare absorbent pump P1, an intermediate absorbent pump P2, a concentrated absorbent pump P3, a refrigerant pump P4, and the like are provided, and these are connected by piping as shown in the figure. Symbol C is a controller.

  That is, in the absorption chiller 100 of the present invention, on the upstream side of the absorption liquid pipe 21 connecting the dilute absorption liquid reservoir formed in the lower part of the absorber 2 and the gas phase part of the low heat source regenerator 9. A rare absorbent pump P1 is provided.

  And the discharge side of the rare absorption liquid pump P1, that is, the downstream side of the absorption liquid pipe 21 passes through the solution cooling absorber 2A provided on the upper side of the absorber 2, and then the absorption liquid in which the low temperature heat exchanger 12 is interposed. The pipe 21 </ b> A and the absorption liquid pipe 21 </ b> B in which the refrigerant drain heat recovery unit 14 intervenes are branched, and then merged and connected to a spreader 9 </ b> A disposed at the upper part in the low heat source regenerator 9.

  The intermediate absorption liquid reservoir formed in the lower part of the low heat source regenerator 9 and the gas phase part of the high temperature regenerator 5 are the intermediate absorption liquid pump P2, the high temperature heat exchanger 13, the first exhaust gas heat recovery unit 15, the on-off valve. V1 is connected by an absorbing liquid pipe 22 interposed in series from the upstream side. The absorption liquid pipe 22 is connected to an absorption liquid pipe 22A with an on-off valve V2 interposed therebetween as shown in the figure.

  The absorption liquid reservoir of the high temperature regenerator 5 and the gas phase part of the low temperature regenerator 6 are connected by an absorption liquid pipe 23 that passes through the high temperature heat exchanger 13, and the absorption liquid pipe 23 upstream of the high temperature heat exchanger 13. The side and the absorber 2 are connected by an absorbing liquid pipe 24 with an on-off valve V3 interposed therebetween.

  A concentrated absorbent pipe 25 connecting the absorbent reservoir of the low-temperature regenerator 6 and the sprayer 2B of the solution-cooled absorbent 2A is piped through the concentrated absorbent pump P3 and the low-temperature heat exchanger 12, and concentrated. The upstream side of the absorption liquid pump P3 and the downstream side of the low-temperature heat exchanger 12 are connected by a bypass pipe 26, and the upstream side of the intermediate absorption liquid pump P2 and the upstream side of the concentrated absorption liquid pump P3 are connected by a bypass pipe 27. Yes.

  The gas phase part of the high temperature regenerator 5 and the bottom part of the condenser 7 are connected by a refrigerant pipe 31 that passes through the heat transfer pipe 6 </ b> A piped to the bottom part of the low temperature regenerator 6 and the refrigerant drain heat recovery unit 14. The upstream side of the heat transfer pipe 6A of the refrigerant pipe 31 and the gas phase part of the absorber 2 are connected by a refrigerant pipe 32 with an on-off valve V4 interposed therebetween, and the upstream side of the heat transfer pipe 6A of the refrigerant pipe 31 and the low heat source regenerator condenser. The gas phase part of the condenser 10 accommodated in the cylinder 11 is connected by a pressure equalizing pipe 41 with an on-off valve V5 interposed.

  Further, the bottom side of the condenser 7 and the vapor phase part of the evaporator 1 are connected by a refrigerant pipe 33 in which a U seal part is interposed, and the vicinity of the U seal part of the refrigerant pipe 34 and the bottom side of the condenser 10 are connected. The refrigerant pipe 34 is connected. Further, the refrigerant liquid reservoir of the evaporator 1 and the spreader 1A in the upper part of the evaporator 1 are connected by the refrigerant pipe 35 with the refrigerant pump P4 interposed therebetween, and the downstream side of the refrigerant pump P4 of the refrigerant pipe 35 and the absorber 2 The absorption liquid reservoir is connected by a refrigerant pipe 36 in which an on-off valve V6 is interposed.

  The vapor phase portions of the evaporator 1 and the condenser 7 are connected to each other by a pressure equalizing tube 42, and the vapor phase portions of the evaporator 1 and the condenser 10 are connected to each other by a pressure equalizing tube 43. 1 outlet side and the condenser 7 of the cooling water pipe | tube 18 and the condenser 10 are connected by the pressure equalization pipe | tube 44 which the on-off valve V7 interposes.

  In the low heat source regenerator 9 of the low heat source regenerator condenser body 11, the heat transfer pipe 9B connected to the low heat source supply pipe 19 is installed below the spreader 9A, and the intermediate absorption liquid pipe 22 is regenerated as the low heat source. It is connected to the bottom part of the vessel 9.

  During cooling operation such as cooling, the temperature of the evaporator 1 outlet side of brine (for example, cold water) circulated and supplied to a heat load (not shown) via the brine pipe 17, that is, accumulated in the refrigerant liquid reservoir of the evaporator 1, The refrigerant liquid pumped by the refrigerant pump P4 and sprayed from the spreader 1A onto the heat transfer tube 1B is cooled when flowing through the heat transfer tube 1B due to evaporation, and discharged from the evaporator 1 The controller C controls the amount of heat input to the absorption refrigeration machine 100 so that the brine evaporator 1 outlet side temperature measured by the temperature sensor S1 becomes a predetermined set temperature, for example, 7 ° C.

  For example, when the heat load is large and the temperature of the hot wastewater supplied to the low heat source regenerator 9 via the low heat source supply pipe 19 reaches a predetermined temperature, for example, 85 ° C., the low heat source supply pipe 19 While supplying the rated amount of warm wastewater to the regenerator 9, all the pumps are started, and the gas burner 4 performs a single double effect operation in which gas is burned, and the temperature of the brine measured by the temperature sensor S1 is a predetermined value. The heating power of the gas burner 4 is controlled by the controller C so as to be 7 ° C.

  The behavior of the refrigerant and the absorption liquid during the single double effect operation will be described. The low heat source regenerator 9 of the low heat source regenerator condenser body 11 is supplied from the absorber 2 through the absorption liquid pipe 21 by the rare absorption liquid pump P1. The transported rare absorbent is heated via the tube wall of the heat transfer tube 9B by the hot waste water supplied from the low heat source supply tube 19 in the process of dropping, and evaporates and separates the refrigerant.

  The intermediate absorption liquid whose absorption liquid concentration has been increased by evaporating and separating the refrigerant is heated by the intermediate absorption liquid pump P2 of the absorption liquid pipe 22 via the high-temperature heat exchanger 13 and the first exhaust gas heat recovery unit 15 to obtain a high temperature. It is sent to the regenerator 5.

  The intermediate absorption liquid conveyed to the high temperature regenerator 5 is heated here by the flame by the gas burner 4 and the high temperature combustion gas, and the refrigerant evaporates and separates. The intermediate absorption liquid whose concentration has been increased by evaporating and separating the refrigerant in the high temperature regenerator 5 is sent to the low temperature regenerator 6 via the high temperature heat exchanger 13 as in the conventional double effect absorption refrigerator.

  Then, the intermediate absorbing liquid is heated by the high-temperature refrigerant vapor supplied from the high-temperature regenerator 5 through the refrigerant vapor pipe 31 and flowing into the heat transfer pipe 6A in the low-temperature regenerator 6, and further the refrigerant is separated to further increase the concentration. The concentrated absorbent is sent to the absorber 2 via the low-temperature heat exchanger 12 and sprayed from above the solution-cooled absorber 2A.

  On the other hand, the refrigerant separated and generated by the low heat source regenerator 9 enters the condenser 10 and condenses, and the refrigerant separated and generated by the low temperature regenerator 6 enters the condenser 7 and condenses. The refrigerant liquid generated by the condenser 7 enters the evaporator 1 via the refrigerant pipe 33 and the refrigerant liquid condensed and generated by the condenser 10 enters the evaporator 1 via the refrigerant pipe 34 and is pumped by the operation of the refrigerant pump 4. It spreads on the heat exchanger tube 1B from the spreader 1A.

  The refrigerant liquid sprayed on the heat transfer tube 1B takes the heat of vaporization from the brine passing through the inside of the heat transfer tube 1B and evaporates. Therefore, the brine passing through the inside of the heat transfer tube 1B is cooled. Cooling operation such as cooling is performed by being supplied to the heat load from the brine pipe 17.

  Then, the refrigerant evaporated in the evaporator 1 enters the absorber 2, is absorbed by the concentrated absorbent supplied from the low temperature regenerator 6 and sprayed from above, and accumulates in the absorbent reservoir of the absorber 2, and becomes a rare absorbent. The circulation conveyed to the low heat source regenerator 9 of the low heat source regenerator condenser body 11 by the pump P1 is repeated.

  At the time of the single double effect operation, the temperature measured by the temperature sensor S1 as described above, that is, cooled in the heat transfer pipe 1B in the evaporator 1, discharged to the brine pipe 17 and circulated and supplied to the heat load. The amount of heating by the gas burner 4, specifically, the amount of gas supplied to the gas burner 4 is controlled by the controller C so that the brine temperature becomes a predetermined 7 ° C.

  Even when the amount of heating by the gas burner 4 is minimized, when the temperature sensor S1 measures a temperature lower than the predetermined 7 ° C., the combustion of the gas is stopped and the heating by the gas burner 4 is stopped, and the operation of the intermediate absorbent pump P2 is performed. Also stop.

  The absorbing liquid in this case is heated only in the low heat source regenerator 9 of the low heat source regenerator condenser body 11 by the hot waste water supplied from the low heat source supply pipe 19 to evaporate and separate the refrigerant. Then, the absorption liquid whose absorption liquid concentration has been increased is returned to the solution cooling absorber 2A via the bypass pipe 27 and the low-temperature heat exchanger 12 by the operation of the concentrated absorption liquid pump P3.

  On the other hand, the refrigerant vapor separated and generated by the low heat source regenerator 9 enters the condenser 10 and condenses, enters the evaporator 1 through the refrigerant pipe 34, and operates from the spreader 1A to the heat transfer pipe 1B by operating the refrigerant pump P4. A circulation is performed in which heat is taken from the brine passing through the heat transfer tube 1B and evaporated to enter the absorber 2 and be absorbed by the absorbent dispersed from above.

  During the single effect operation, the temperature measured by the temperature sensor S1, that is, the temperature of the brine cooled by the heat transfer pipe 1B in the evaporator 1 and discharged to the brine pipe 17 and circulated and supplied to the heat load is a predetermined 7 The controller C controls the amount of heating in the low heat source regenerator 9, specifically, the amount of warm waste water taken into the heat transfer tube 9 B from the low heat source supply pipe 19, that is, the opening degree of the three-way valve V 7 so .

  And even if the three-way valve V7 is operated so that the entire amount of the hot drainage flowing through the low heat source supply pipe 19 flows to the heat transfer pipe 9B, the temperature sensor S1 does not measure a temperature of 7 ° C. or less, that is, the heat transfer pipe. When the brine cooled by 1B and discharged to the brine pipe 17 does not drop to a predetermined 7 ° C., the gas is burned by the gas burner 4 as described above, and the high temperature regenerator 5 heats and regenerates the absorption liquid and generates refrigerant vapor. Is resumed, and the operation returns to the single double effect operation.

  Although the heat load is large, the temperature of the hot wastewater supplied to the low heat source regenerator 9 via the low heat source supply pipe 19 does not reach the predetermined 85 ° C., the low heat source regenerator 9 is connected to the low heat source supply pipe 19. In addition, the three-way valve V7 is switched so that hot wastewater is not supplied to the gas generator, all the pumps are started, and the gas burner 4 performs a double-effect operation in which gas is burned. Also in this case, the heating power of the gas burner 4 is controlled by the controller C so that the temperature of the brine measured by the temperature sensor S1 becomes a predetermined temperature of 7 ° C.

  In this double-effect operation, the rare absorption liquid in the absorption liquid reservoir of the absorber 2 is conveyed to the low heat source regenerator 9 by the rare absorption liquid pump P1 and dispersed on the heat transfer tube 9B from the spreader 9A. Since the hot drainage as a heat source is not supplied to the heat transfer tube 9B, it is dropped without being heated and is transported to the high temperature regenerator 5 via the high temperature heat exchanger 13 by the operation of the intermediate absorbent pump P2. After that, it is heated while being circulated in the same manner as in the single double effect operation, and the high temperature regenerator 5 and the low temperature regenerator 6 concentrate and regenerate the absorbing liquid and separate and produce the refrigerant.

  Then, the gas is burned by the gas burner 4 and the absorption liquid is heated and regenerated by the high-temperature regenerator 5, and from the operation state in which refrigerant vapor is generated, that is, from the double effect operation or the single double effect operation, When the combustion is stopped and the heating liquid is regenerated and the refrigerant vapor is generated only by the warm waste water supplied from the low heat source supply pipe 19 to the heat transfer pipe 9B, the controller C opens the on-off valve V5 to increase the temperature. The refrigerant vapor generated in the regenerator 5 is directly flowed to the condenser 10 via the refrigerant pipe 31 and the pressure equalizing pipe 41, and is dissipated to the cooling water flowing inside the cooling water pipe 18 to be condensed.

  Therefore, in the absorption refrigerator 100 of the present invention, the gas supplied from the low heat source supply pipe 19 to the heat transfer pipe 9B is stopped by stopping the gas combustion in the gas burner 4 from the double effect operation or the single double effect operation. The residual pressure of the high-temperature regenerator 5 quickly decreases when shifting to a single-effect operation in which the absorption liquid is heated and regenerated and the refrigerant vapor is generated only by drainage, and the intermediate absorption liquid pump P2 is not repeatedly operated and stopped. .

  Therefore, the refrigerant is regenerated so as to be able to absorb the refrigerant by evaporating and separating, and the amount of the absorbing liquid flowing into the absorber 2 from the low heat source regenerator 9 is stabilized. Accordingly, since the amount of refrigerant absorbed in the absorbing liquid in the absorber 2 is stabilized and the amount of refrigerant evaporated in the evaporator 1 is stabilized, the amount of brine to be circulated from the evaporator 1 to the heat load via the brine pipe 17 is increased. The temperature stabilizes.

  In the absorption refrigerator 100 of the present invention, the combustion exhaust gas generated by the gas burner 4 is configured to be exhausted via the first and second exhaust gas heat recovery units 15 and 16. Therefore, in the first exhaust gas heat recovery unit 15, the waste heat retained by the combustion exhaust gas is recovered by the intermediate absorption liquid flowing into the high temperature regenerator 5, and is supplied to the gas burner 4 in the second exhaust gas heat recovery unit 16. The waste heat possessed by the combustion exhaust gas is recovered by the combustion air. Therefore, the temperature of the intermediate absorption liquid flowing into the high-temperature regenerator 5 and the combustion air supplied to the gas burner 4 rise, and the consumption of fuel combusted in the gas burner 4 is suppressed.

  By the way, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit described in the claims.

The configuration shown in FIG. 1B corresponds to [means for solving the problem].
For example, the upstream side of the heat transfer pipe 6A of the refrigerant pipe 31 and the gas phase part of the condenser 7 housed in the low temperature regenerator condenser body 8 may be connected by a pressure equalizing pipe 41 with an on-off valve V5 interposed therebetween, The upstream side of the heat transfer pipe 6 </ b> A of the refrigerant pipe 31 is provided in both the gas phase part of the condenser 10 housed in the low heat source regenerator condenser body 11 and the gas phase part of the condenser 7 housed in the low temperature regenerator condenser body 8. Further, they may be connected by a uniform pipe 41 with an on-off valve V5 interposed therebetween.

  The refrigerant drain heat recovery unit 14 and the solution cooling absorber 2A provided in the absorber 2 are not necessarily provided.

It is explanatory drawing which shows the structure of the absorption refrigerator of this invention. It is explanatory drawing which shows the structure of the absorption refrigerator of this invention. It is explanatory drawing which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 3 Evaporator absorber cylinder 5 High temperature regenerator 6 Low temperature regenerator 7 Condenser 8 Low temperature regenerator condenser cylinder 9 Low heat source regenerator 10 Condenser 11 Low heat source regenerator condenser cylinder 12 Low temperature heat exchange 13 High temperature heat exchanger 14 Refrigerant drain heat recovery unit 17 Brine pipe 18 Cooling water pipe 19 Low heat source supply pipe 21-25 Absorption liquid pipe 31-34 Refrigerant pipe 41-44 Pressure equalizing pipe C Controller P1 Rare absorption liquid pump P2 Intermediate absorption Liquid pump P3 Concentrated liquid pump P4 Refrigerant pump S1 Temperature sensor V1-V6 On-off valve V7 Three-way valve 100, 100X Absorption type refrigerator

Claims (2)

Evaporator absorber cylinder containing the evaporator and absorber, low temperature regenerator condenser cylinder containing the low temperature regenerator and condenser, low heat source regenerator and condenser using the hot drain as a heat source. Low heat source regenerator Condenser barrel, high temperature regenerator, low temperature heat exchanger, high temperature heat exchanger, refrigerant pump, absorption liquid pump, etc.
Connecting the refrigerant pipe leading to the low temperature regenerator from the Atsushi Ko regenerator, wherein the pressure equalizing pipe cold source regenerator condenser cylinders and / or said low-temperature heat source regenerator condenser cylinder condenser and an on-off valve is interposed And
A single-double-effect absorption refrigerator that opens and closes the on-off valve according to the temperature of the heat source flowing into the low heat source regenerator and the operating state of a gas burner provided in the high temperature regenerator . The heating was stopped of the absorbent in the high temperature regenerator, wherein when the switch only for heating the absorbent solution in the low heat source regenerator condenser cylinder of the low heat source regenerator, opening the opening closing of the equalizing pipe The single-double-effect absorption refrigerator according to claim 1.

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