JPH06341729A - Controlling method for operation of single-double effect absorption refrigerating machine - Google Patents

Abstract

PURPOSE:To improve a coefficient of performance of a single-double effect absorption refrigerating machine at the time of a single effect operation. CONSTITUTION:At the time of a low-load operation when a sufficient quantity of heat for a load is obtained from hot waste water flowing through a low-heat source supply piping 29 when cold water is supplied with on-off valves 19V, 21V, 25V and 28V closed, both of the operation of an intermediate absorption liquid pump P2 and the operation of a high-temperature regenerator 4 are stopped. In a frequency converter 11, the frequency of a power supplied to a rare absorption liquid pump P1 is converted to be increased when the temperature of a solution discharged to an intermediate absorption liquid piping 15 from a low-heat source regenerator 9 is high and to be decreased when it is low, and thereby the number of revolutions of the rare absorption liquid pump P1 is controlled. Therefore circulation of a rare absorption liquid lessens at the time of a low load and, accordingly, the amount of evaporation of a refrigerant is reduced. Consequently, a sensible heat loss is reduced and a coefficient of performance is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating machine, and more particularly to a method for controlling the operation of a single double-effect absorption refrigerating machine having a low heat source regenerator condenser barrel containing a low heat source regenerator and a condenser. .

[0002]

2. Description of the Related Art For example, in Japanese Unexamined Patent Publication (Kokai) No. 4-260760, an evaporator absorber cylinder containing an evaporator and an absorber, a low temperature regenerator condenser cylinder containing a low temperature regenerator and a condenser, warm waste water, etc. Low heat source regenerator as low temperature heat source and low heat source regenerator containing condenser Condenser body, high temperature regenerator, low temperature heat exchanger, high temperature heat exchanger, rare absorbent pump and intermediate absorbent pump connected by piping A technique for making a single-double-effect absorption refrigerator is disclosed.

[0003]

In the above single-double-effect absorption refrigerator, the rare-absorption liquid pump, that is, the pipe portion connecting the absorber and the low heat source regenerator, is installed to absorb the rare absorption from the absorber. The pump for sending the liquid to the low heat source regenerator is
It is provided so that the refrigerator is operated at a rated speed, that is, at a constant rotation speed, while the refrigerator is started and then stopped.

Therefore, in the conventional refrigerator / cooler, the load is small and it is sufficient to operate the low heat source regenerator, or when the low heat source regenerator and the high temperature regenerator are operated together, the load is reduced. Even when the temperature of the high temperature regenerator is extinguished due to the decrease, the solution with the maximum rated flow rate circulates in the low temperature regenerator, resulting in a large sensible heat loss and thus a decrease in the coefficient of performance. There was a problem to solve this point.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention solves the above-mentioned problems of the prior art by means of an evaporator absorber body containing an evaporator and an absorber, and a low temperature regenerator containing a low temperature regenerator and a condenser. Low heat source regenerator containing a condenser body and a low heat source regenerator that uses hot wastewater as a low temperature heat source, and a condenser body, a high temperature regenerator, a low temperature heat exchanger, a high temperature heat exchanger, a rare absorbent pump, and In a single-double-effect absorption refrigerator with an intermediate absorbent pump connected by piping,

At the time of low load, both the operation of the intermediate absorbent pump installed in the pipe section connecting the low heat source regenerator and the high temperature regenerator and the operation of the high temperature regenerator are stopped, and the absorber and the low heat source are The number of revolutions of the rare absorbent pump installed in the pipe part connecting to the regenerator is controlled based on the temperature of the solution discharged from the low heat source regenerator.

When the load is high, the rare absorbent pump installed in the pipe section connecting the absorber and the low heat source regenerator is operated under rated operation, and the pipe connecting the low heat source regenerator and the high temperature regenerator is connected. The rotation speed of the intermediate absorption liquid pump installed in the section is controlled based on the solution temperature of the high temperature regenerator and the inlet temperature of the cooling water flowing into the absorber,

When the load is high, the fuel supply amount to the high temperature regenerator and the low temperature heat source supply amount to the low heat source regenerator are independently controlled based on the temperature of the cold water discharged from the evaporator. It was done.

[0009]

[Function] When a sufficient amount of heat for the load can be obtained from a low temperature heat source such as hot wastewater flowing into the low heat source regenerator, both the operation of the intermediate absorbent pump and the operation of the high temperature regenerator are stopped, resulting in rare absorption. Since the single-effect operation is performed in which the rotation speed of the liquid pump is controlled based on the temperature of the solution discharged from the low heat source regenerator, the circulation of the rare absorption liquid is reduced, and the evaporation amount of the refrigerant is reduced. Heat loss is reduced and the coefficient of performance is improved.

On the other hand, when the load is large, in addition to the operation of the low heat source regenerator, the high temperature regenerator and the intermediate absorbent pump are started to perform the single double effect operation, so that a high refrigerating capacity can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a single-double-effect absorption refrigerator using, for example, water as a refrigerant and a lithium bromide (LiBr) solution as an absorption liquid (solution), and 1 is an evaporator,
Reference numeral 2 is an absorber, 3 is an evaporator absorber shell (hereinafter, referred to as a lower shell) accommodating the evaporator 1 and the absorber 2, 4 is, for example, a gas burner 5, and high temperature regeneration is performed by a flame generated by the gas burner 5. , 6 is a low temperature regenerator, 7 is a condenser for the low temperature regenerator 6 (hereinafter referred to as the first condenser), 8 is a low temperature regenerator 6
A low temperature regenerator condenser body (hereinafter, referred to as a first upper body) accommodating a first condenser 7 and a low heat source regenerator 9 that uses, for example, warm waste water of about 80 ° C. as a low temperature heat source, and 10 is a low heat source. Regenerator 9
A condenser (hereinafter, referred to as a second condenser) 11 for storing a low heat source regenerator 9 and a second condenser 10, and a low heat source regenerator condenser cylinder (hereinafter, referred to as a second upper cylinder). , 12 are low temperature heat exchangers, and 13 are high temperature heat exchangers.

Reference numeral 2A denotes a rare absorbent pool formed in the lower portion of the absorber 2. The rare absorbent pool 2A and the low heat source regenerator 9 are provided.
The gas phase part is connected by a dilute absorbent pipe 14 equipped with a dilute absorbent pump P1 on the way. Further, the intermediate absorbent pool 9A formed in the lower portion of the low heat source regenerator 9 and the gas phase portion of the high temperature regenerator 4 are connected by an intermediate absorbent pipe 15 equipped with an intermediate absorbent pump P2. There is.

Reference numeral 4A denotes an intermediate absorption liquid pool formed in the high temperature regenerator 4, and the intermediate absorption liquid pool 4A and the low temperature regenerator 6 are provided.
The gas phase part is connected by a pipe 16 for an intermediate absorbing liquid. Further, the concentrated absorbent pool 6A formed in the lower part of the low temperature regenerator 6 and the concentrated absorbent spraying device 2B provided in the gas phase part of the absorber 2 are the concentrated absorbent pipes 17A and 17B. The pipe 17 is connected to the pipe.

An intermediate absorption liquid pipe 15A on the suction side of the intermediate absorption liquid pump P2 and a concentrated absorption liquid pipe 17A on the upstream side of the low temperature heat exchanger 12 are connected by an absorption liquid pipe 18.
The absorbing liquid pipe 18 is installed at a level lower than that of the first upper body 8, and even if there is a difference between the pressure in the second upper body and the pressure in the first upper body 8, the space between the bodies is reduced. Can be U-sealed.

Further, the intermediate absorption liquid pipe 16A on the upstream side of the high temperature heat exchanger 13 and the absorber 2 are connected by an intermediate absorption liquid pipe 19 having an opening / closing valve 19V in the middle thereof. The on-off valve 19V is closed when cold water is supplied and opened when hot water is supplied.

Reference numeral 20 denotes a refrigerant vapor pipe extending from the gas phase portion of the high temperature regenerator 4 to the first upper body 8, and opens at the bottom of the first condenser 7 via the inside of the low temperature regenerator 6. Reference numeral 21 denotes a refrigerant vapor pipe which is provided with an on-off valve 21V on the way and connects the refrigerant vapor pipe 20A in front of the low-temperature regenerator 6 and the gas phase portion of the absorber 2 to each other. The on-off valve 21V is closed when cold water is supplied, It is opened when hot water is supplied.

Reference numeral 22 is a first refrigerant liquid pipe for connecting the bottom portion of the first condenser 7 and the vapor phase portion of the evaporator 1 by piping.
A U-seal portion 22A is formed in the refrigerant liquid pipe 22.
Further, 23 is the bottom of the second condenser 10 and the first refrigerant liquid pipe 2
It is the second refrigerant liquid pipe that connects the second U seal portion 22A with the pipe. Therefore, the second refrigerant liquid pipe 23 also has the first
The U-seal portion 23A is formed at the connection portion with the refrigerant liquid pipe 22.

Reference numeral 24 is a refrigerant liquid circulation pipe for connecting the refrigerant liquid reservoir 1A of the evaporator 1 and the refrigerant dispersion device 1B, and a refrigerant liquid pump P3 is provided in the middle of the refrigerant liquid circulation pipe 24. Reference numeral 25 denotes a refrigerant liquid drain pipe connected between the refrigerant liquid reservoir 1A and the rare absorption liquid reservoir 2A, and an opening / closing valve 25V is provided in the refrigerant liquid drain pipe 25.

Reference numeral 26 denotes a cold / hot water pipe 26A and a cold / hot water heat exchanger 2
6B is a cold / hot water pipe consisting of a hot / cold water pipe 26C. Further, 27 is a cooling water pipe, and this cooling water pipe 27 passes from a cooling tower (not shown) through an absorber heat exchanger 27A, a first condenser heat exchanger 27B, and a second condenser heat exchanger 27C. A circulation path for cooling water that returns to the cooling tower is formed.

A cooling water pipe 27D and a cold / hot water pipe 26 extending from the first condenser heat exchanger 27B to the second condenser heat exchanger 27C.
The cold / hot water pipe 26C is connected by a cooling water pipe 28 having an opening / closing valve 28V in the middle thereof.
Is opened when hot water is supplied and when the cooling water is stored in the cooling water pipe 27.

Reference numeral 29 is a low heat source supply pipe for supplying the waste heat water of about 80 ° C. to the low heat source regenerator 9 as a low temperature heat source. The low heat source water pipe 29A, the low heat source heat exchanger 29B, the low heat source water pipe 29C, and the side. Flow pipe 29D, flow control valve 2 which is a three-way valve
It is composed of 9E.

C1 is a main controller, and this controller C1 is a cold / hot water heat exchanger 26 measured by a temperature sensor T1.
The flow control valve 29E of the low heat source supply pipe 29 is based on the temperature of the hot / cold water flowing through the cold / hot water pipe 26C after heat exchange with B.
By controlling the opening degree of the low heat source regenerator 9 and adjusting the amount of warm waste water supplied to the low heat source regenerator 9, the refrigerant regeneration capacity in the low heat source regenerator 9 is controlled, and the temperature data is stored in the controllers C2 and C3. The control of the flow rate of the gas supplied to the gas burner 5, the start / stop control of the intermediate absorption liquid pump P2, and the rated operation instruction of the rare absorption liquid pump P1 are executed.

The controller C2 controls the flow rate of the gas supplied to the gas burner 5 and controls the start / stop of the intermediate absorbent pump P2 based on the temperature information of the cold / hot water obtained from the controller C1. The temperature of the cooling water flowing in the absorber 2 flowing through the cooling water pipe 27 measured by the temperature sensor T2,
Based on the temperature of the solution in the high temperature regenerator 4 measured by the temperature sensor T3, the frequency converter I2 also has a function of converting the frequency of the electric power supplied to the intermediate absorption liquid pump P2.

C3 is a controller for controlling the operation of the lean absorbent pump P1, and this controller C3 instructs the rated operation of the lean absorbent pump P1 based on the temperature information from the controller C1. When the rated operation is not instructed, the electric power supplied to the dilute absorbent pump P1 is determined based on the temperature of the intermediate absorbent that is discharged from the low heat source regenerator 9 to the intermediate absorbent pipe 15 measured by the temperature sensor T4. Frequency
The frequency is converted by the frequency converter I1.

(B) Single-effect operation control In the absorption refrigerator having the above-mentioned structure, when cold water is supplied to the load and sufficient heat is obtained for the load from the warm wastewater of the low heat source supply pipe 29. The control of the single effect cold water supply operation to be performed will be described. At the time of this cold water supply, the on-off valves 19V, 21V, 25V and 28V are closed.
Then, the controller C1 controls the opening degree of the control valve 29E based on the temperature of the cold water measured by the temperature sensor T1 to adjust the flow rate of the warm waste water flowing through the low heat source heat exchanger 29B. At this time, since the cold water temperature measured by the temperature sensor T1 is equal to or lower than the predetermined temperature, the controller C1 outputs this temperature information to the controller C.
2. Send to C3.

The controller C2 does not supply the gas to the gas burner 5 on the basis of the temperature information that the temperature of the cold water flowing through the cold / hot water pipe 26C obtained from the controller C1 is equal to or lower than a predetermined temperature, and does not perform the intermediate absorption. It also does not instruct activation of the liquid pump P2.

On the other hand, the controller C3 is obtained from the controller C1.
Based on the temperature information that the cold water temperature is lower than or equal to a predetermined temperature, the rare absorption is not performed based on the temperature of the intermediate absorption liquid measured by the temperature sensor T4, instead of instructing the rated operation of the rare absorption liquid pump P1. The frequency of the electric power supplied to the liquid pump P1 is controlled in the frequency converter I1 as shown in FIG. 2, for example, to control the rotation speed of the dilute absorption liquid pump P1.

That is, for example, when the temperature of the intermediate absorption liquid measured by the temperature sensor T4 is 80 ° C. or higher, the rated value is 60.
When the load is small, the circulation of the rare absorbing liquid is reduced by operating at a frequency of 30 Hz, which is half the rated voltage when the temperature is 70 ° C or less, and at a frequency proportional to the temperature when the temperature is between 70 and 80 ° C. As a result, the evaporation amount of the refrigerant is also reduced, so that the sensible heat loss is reduced and the coefficient of performance is improved.

It should be noted that the flow of the refrigerant and the solution itself is well known in the prior art. Briefly, however, the intermediate absorption liquid whose concentration is increased by separating the refrigerant in the low heat source regenerator 9 has an intermediate absorption liquid pipe 15
Absorption liquid pipe 18, concentrated absorption liquid pipe 17A, low temperature heat exchanger 1
2. It is sprayed from the concentrated absorbent spray device 2B to the absorber heat exchanger 27A via the concentrated absorbent pipe 17B.

The refrigerant separated in the low heat source regenerator 9 flows into the second condenser 10 to be cooled and condensed. Then, the refrigerant liquid flows down the second refrigerant liquid pipe 23, and the U seal portion 23A.
Collect in 2A. The refrigerant liquid accumulated in the U seal portions 23A and 22A overflows and flows into the evaporator 1. The refrigerant liquid that has flowed into the first refrigerant liquid pipe 22 from the U-seal portion 23A self-evaporates, and the internal pressure of the first refrigerant liquid pipe 22 and the first upper body 8 rises due to the vapor pressure.

The refrigerant liquid accumulated in the refrigerant liquid reservoir 1A of the evaporator 1 is sprayed from the refrigerant spraying device 1B to the cold / hot water heat exchanger 26B by the operation of the refrigerant liquid pump P3 of the refrigerant liquid circulation pipe 24. Then, the cold water cooled by the latent heat when the refrigerant liquid is vaporized is cooled / hot water heat exchanger 26B / cooled / hot water pipe 26C.
Supplied to the load from. The refrigerant vaporized in the evaporator 1 flows to the absorber 2 and is absorbed by the concentrated absorbent spread from the concentrated absorbent dispersion device 2B.

(B) Single-duplex combination operation control The flow rate of the hot waste water supplied to the low heat source heat exchanger 29B in accordance with the temperature rise of the cold water flowing through the cold / hot water pipe 26C measured by the temperature sensor T1 due to the large load of the cold water. Even if you increase
When the cold water temperature measured by the temperature sensor T1 does not drop to the set temperature, the controller C2 instructs the intermediate absorbent pump P2 to start based on the cold water temperature information transmitted from the controller C1. , Instructing the ignition of the gas burner 5 and controlling the gas flow rate supplied to the gas burner 5 based on the temperature information.

Further, the controller C2, based on the temperature of the cooling water measured by the temperature sensor T2 and the temperature of the solution in the high temperature regenerator 4 measured by the temperature sensor T3, determines the intermediate absorption liquid pump P.
The frequency of the electric power supplied to 2 is controlled in the frequency converter I2 as shown in FIG.
Control the rotation speed of.

That is, when the rated frequency is 60 Hz, the lowest frequency is, for example, 28 Hz which is less than half of the rated value, and the lower the temperature of the cooling water measured by the temperature sensor T2 during this period, the higher the temperature regeneration measured by the temperature sensor T3. The higher the temperature of the solution in the vessel 4, the higher the frequency of the conversion, and the conversion is performed so that the rotation speed of the intermediate absorption liquid pump P2 is increased.

On the other hand, the controller C3 is obtained from the controller C1.
Based on the temperature information that the cold water temperature has not dropped to the predetermined temperature, the rated operation of the diluted absorbent pump 1 is started, and as a whole, the absorber 2, the low heat source regenerator 9, and the high temperature regeneration are performed. Vessel 4, high temperature heat exchanger 13, low temperature regenerator 6
-Low temperature heat exchanger 12-First condenser 7-Second condenser 10-
Since the refrigeration cycle is configured by the evaporator 1, it is possible to quickly cope with an increase in the cold / hot water load.

In this case, the intermediate absorption liquid of the low heat source regenerator 9 is sent to the high temperature regenerator 4 by the intermediate absorption liquid pump P2,
It is heated here and the refrigerant evaporates and separates. The intermediate absorption liquid whose concentration has increased in the high temperature regenerator 4 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 absorbent is heated in the low temperature regenerator 6 by the refrigerant vapor sent through the refrigerant vapor pipe 20, and the refrigerant is further separated to have a higher concentration, and the concentrated absorbent passes through the low temperature heat exchanger 12. After that, it is sent to the absorber 2 and sprayed from the concentrated absorbent dispersion device 2B.

The refrigerant separated in the low heat source regenerator 9 is condensed in the second condenser 10, and the refrigerant separated in the low temperature regenerator 6 is condensed in the first condenser 7. Then, the refrigerant liquid flows from the first condenser 7 and the second condenser 10 to the evaporator 1 via the first refrigerant liquid pipe 22 and the second refrigerant liquid pipe 23, and is sprayed from the refrigerant spraying device 1B.

The cold water cooled by the cold / hot water heat exchanger 26B is supplied to the load by the cold / hot water pipe 26C.
Further, the refrigerant vaporized in the evaporator 1 flows to the absorber 2 and is absorbed by the concentrated absorbent spread from the concentrated absorbent dispersion device 2B.

When supplying hot water to the load, the on-off valve 1
9V, 21V, 25V and 28V are opened, and the high temperature refrigerant vapor generated in the high temperature regenerator 4 flows to the lower body 3 through the refrigerant vapor pipe 20A and the refrigerant vapor pipe 21. The hot water flowing through the cold / hot water heat exchanger 26B is heated by the refrigerant vapor and supplied to the load via the cold / hot water pipe 26C. Further, the refrigerant liquid that has contacted with the cold / hot water heat exchanger 26B and is condensed and accumulated in the refrigerant liquid pool 1A flows into the rare absorption liquid pool 2A through the refrigerant liquid drain pipe 25.

Since the present invention is not limited to the above-mentioned embodiments, various modifications can be made without departing from the spirit of the claims.

For example, the controllers C1, C2, and C3 are individually provided in the embodiment to facilitate understanding of the present invention, but in an actual device, they are formed by a microcomputer in which a control circuit is written in one chip. Of course it is possible.

Further, based on the cold / hot water temperature measured by one temperature sensor T1, the opening control of the flow control valve 29E, the rated operation instruction of the rare absorbent pump P1, and the intermediate absorbent pump P are performed.
Although the starting / stopping of No. 2 and the control of the gas amount supplied to the gas burner 5 are performed, a temperature sensor corresponding to each device may be installed.

[0043]

As described above, according to the present invention, when a sufficient amount of heat for a load can be obtained from a low temperature heat source such as warm waste water flowing into a low heat source regenerator, the operation of the intermediate absorbent pump is performed. Since the operation of the high temperature regenerator is stopped together and the number of revolutions of the rare absorbent pump is controlled based on the temperature of the solution discharged from the low heat source regenerator, the single effect operation is performed.
Since the circulation of the rare absorption liquid is reduced, and the evaporation amount of the refrigerant is reduced, the sensible heat loss is reduced and the coefficient of performance is improved.

On the other hand, when the load is large, in addition to the operation of the low heat source regenerator, the high temperature regenerator and the intermediate absorption liquid pump are started to perform the single double effect operation, so that a high refrigerating capacity is obtained. It has a remarkable effect.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a single-double-effect absorption refrigerator.

FIG. 2 is an explanatory diagram showing an example of control of a rare absorbent pump.

FIG. 3 is an explanatory diagram showing an example of control of an intermediate absorbent pump.

[Explanation of symbols]

 1 Evaporator 1A Refrigerant Liquid Reservoir 1B Refrigerant Dispersing Device 2 Absorber 2A Rare Absorbing Liquid Reservoir 2B Concentrated Absorbing Liquid Dispersing Device 3 Lower Body (Evaporator Absorber Body) 4 High Temperature Regenerator 4A Intermediate Absorbing Liquid Reservoir 5 Gas Burner 6 Low Temperature Regenerator 6A Concentrated absorption liquid reservoir 7 1st condenser 8 1st upper body (low temperature regenerator condenser body) 9 Low heat source regenerator 9A Intermediate absorption liquid reservoir 10 2nd condenser 11 2nd upper body (low heat source regenerator condenser) 12) Low-temperature heat exchanger 13 High-temperature heat exchanger 14 Rare absorption liquid pipe 15 Intermediate absorption liquid pipe 15A Intermediate absorption liquid pipe 16 Intermediate absorption liquid pipe 16A Intermediate absorption liquid pipe 17 Concentrated absorption liquid pipe 17A Concentrated absorption liquid pipe 17B Concentrated absorption liquid Liquid pipe 18 Absorbing liquid pipe 19 Intermediate absorbing liquid pipe 19V Open / close valve 20 Refrigerant vapor pipe 20A Refrigerant vapor pipe 21 Refrigerant vapor pipe 21V Open / close valve 22 First refrigerant liquid pipe 22A U seal part 23 Second cold Liquid pipe 23A U seal part 24 Refrigerant liquid circulation pipe 25 Refrigerant liquid drain pipe 25V Open / close valve 26 Cold / hot water pipe 26A Cold / hot water pipe 26B Cold / hot water heat exchanger 26C Cold / hot water pipe 27 Cooling water pipe 27A Absorber heat exchanger 27B First condenser Heat exchanger 27C Second condenser heat exchanger 27D Cooling water pipe 28 Cooling water pipe 28V Open / close valve 29 Low heat source supply pipe 29A Low heat source water pipe 29B Low heat source heat exchanger 29C Low heat source water pipe 29D Side pipe 29E Flow control valve C1 ( Main) Controller C2 (for intermediate absorption liquid pump) Controller C3 (for rare absorption liquid pump) Controller I1, I2 Frequency converter P1 Rare absorption liquid pump P2 Intermediate absorption liquid pump P3 Refrigerant liquid pump T1-T4 Temperature sensor

Claims (3)

[Claims] 1. An evaporator absorber body containing an evaporator and an absorber, a low temperature regenerator condenser body containing a low temperature regenerator and a condenser, and a low heat source regenerator using hot wastewater as a low temperature heat source. A low heat source regenerator containing a condenser, a condenser body, a high temperature regenerator, a low temperature heat exchanger, a high temperature heat exchanger, a single double effect absorption refrigerator with pipe connection of a rare absorption liquid pump and an intermediate absorption liquid pump, When the load is low, both the operation of the intermediate absorbent pump installed in the pipe connecting the low heat source regenerator and the high temperature regenerator and the operation of the high temperature regenerator are stopped, and the absorber and the low heat source regenerator Operation control of single-dual-effect absorption chiller characterized by controlling the number of revolutions of the rare absorbent pump installed in the pipe connecting the Method. 2. An evaporator absorber body containing an evaporator and an absorber, a low temperature regenerator condenser body containing a low temperature regenerator and a condenser, and a low heat source regenerator using hot wastewater as a low temperature heat source. A low heat source regenerator containing a condenser, a condenser body, a high temperature regenerator, a low temperature heat exchanger, a high temperature heat exchanger, a single double effect absorption refrigerator with pipe connection of a rare absorption liquid pump and an intermediate absorption liquid pump, When the load is high, the rare absorbent pump installed in the pipe that connects the absorber and the low heat source regenerator is operated under rated conditions, and installed in the pipe that connects the low heat source regenerator and the high temperature regenerator. The rotation speed of the intermediate absorption liquid pump is controlled based on the solution temperature of the high temperature regenerator and the inlet temperature of the cooling water flowing into the absorber. Operation control method. 3. An evaporator absorber cylinder containing an evaporator and an absorber, a low temperature regenerator condenser cylinder containing a low temperature regenerator and a condenser, and a low heat source regenerator using hot wastewater as a low temperature heat source. A low heat source regenerator containing a condenser, a condenser body, a high temperature regenerator, a low temperature heat exchanger, a high temperature heat exchanger, a single double effect absorption refrigerator with pipe connection of a rare absorption liquid pump and an intermediate absorption liquid pump, At high load, the fuel supply amount to the high temperature regenerator and the low temperature heat source supply amount to the low heat source regenerator are independently controlled based on the temperature of the cold water discharged from the evaporator. Operation control method for double-effect absorption refrigerator.