JP2000283589A - Vapor heating absoption water cooling/heating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a dilute solution by a condensed solution without rendering the size large and stably control vapor as a heating source in a region from high load to partial load. SOLUTION: Control means 16, 17 which are provided to a piping system on this side of divergence, are fixed to the regenerator 11 in order to control a dilute solution, which is transferred from an absorber 4 to a high temperature regenerator 11 and a low temperature regenerator 9, by a condensed solution which is transferred from the regenerator 11 to the absorber 4. Further, the piping system on this side of divergence is provided with a drain cooler 19 for exchanging heat of the dilute solution which is transferred from the absorber 4 to the regenerator 11 and the regenerator 9, with the heat of the vapor from the regenerator 11 after heating. Furthermore, there are provided a low temperature solution heat exchanger 8 and a high temperature solution heat exchanger 10 for exchanging heat of the dilute solution with that of the condensed solution separated with refrigerant at the front and rear of the control means 16, 17, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a steam-fired absorption chiller / heater using steam supplied from an external heat source as a heating source,
Steam that can control the whole diluted solution with a part of concentrated solution to obtain excellent operation characteristics from high load to partial load range, and can stably recirculate steam supplied from an external heat source to low temperature It relates to a fired absorption chiller / heater.

[0002]

2. Description of the Related Art In a conventional absorption chiller / heater, for example, as described in JP-A-10-38402,
By operating the switching valve, it is possible to take out cold water and hot water from the evaporator, and the steam supplied from the external heat source is circulated at the time of taking out cold water or hot water. Steam from an external heat source was heat exchanged with some dilute solution sent from the absorber to the high temperature regenerator.

Further, as described in Japanese Patent Application Laid-Open No. 05-26533, control of the amount of circulating solution is realized without particularly requiring a large-scale device, and gas-fired or operable gas can be operated from a high load to a partial load region. An oil fired absorption chiller / heater is disclosed.

Further, a steam-fired absorption chiller / heater for heating a high-temperature regenerator by supplying steam from an external heat source is also known.
The refrigeration cycle will be described with reference to the system diagram shown in FIG.

[0005] Reference numeral 1 denotes an evaporator. The refrigerant is circulated by a refrigerant pump 2 and dispersed on the surface of an evaporator heat transfer tube 3. The refrigerant exchanges heat with cold water and changes to steam. The generated refrigerant vapor is sent to the absorber 4 and is absorbed by the solution sprayed on the surface of the heat transfer tube 6. The dilute solution that has absorbed the refrigerant vapor passes through the low-temperature solution heat exchanger 8 in the dilute solution pipe 7 by the solution pump 5, partially flows into the low-temperature regenerator 9 through the dilute solution pipe 7 b, and the remainder flows through the dilute solution pipe 7 a. It is sent to the high temperature regenerator 11 via the exchanger 10. The dilute solution is heated by the steam flowing through the steam pipe 18 in the high-temperature regenerator 11 to separate the refrigerant vapor from the dilute solution.

In the low-temperature regenerator 9, the diluted solution separates the refrigerant vapor using the refrigerant vapor generated in the high-temperature regenerator 11 as a heating source. The concentrated solution from which the refrigerant vapor has been separated is supplied from the high-temperature regenerator 11 to the high-temperature solution heat exchanger
, And sent to the absorber 4 through the low-temperature solution heat exchanger 8. The concentrated solution from which the refrigerant vapor has been separated in the low-temperature regenerator 9 is sent to the absorber 4 via the low-temperature solution heat exchanger 8 through the concentrated solution pipe 12b. The refrigerant vapor generated in the low-temperature regenerator 9 is supplied to the condenser 13
And is condensed on the surface of the absorber heat transfer tube 6. The condensed refrigerant is sent to the evaporator 1.

On the other hand, the steam used as a heating source in the high-temperature regenerator 11 exchanges heat with the dilute solution in the drain cooler 19 sent from the absorber 4 to the low-temperature regenerator 9 and is returned at low temperature. The steam amount of the heating source of the high-temperature regenerator 11 is controlled by a steam control valve 15 in response to a command from the temperature controller 14. The float valve 16 is provided on the dilute solution pipe 7a for controlling a part of the dilute solution from the absorber 4, and the float box 17 is provided with the concentrated solution pipe 12a for supplying the concentrated solution from the high temperature regenerator 11 to the absorber 4. Are located in

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
No. 402, the steam supplied from the external heat source exchanges heat with a part of the dilute solution sent from the absorber to the high-temperature regenerator to form a water ring. No consideration was given to controlling the total dilute solution by the concentrated solution sent.

The one described in Japanese Patent Application Laid-Open No. 05-26533 controls the amount of solution circulation without requiring a particularly large-scale device, and can operate from a high load to a partial load range. The heating source of the regenerator was limited to gas-fired or oil-fired.

Further, in the steam-fired absorption chiller / heater shown in FIG. 6, no consideration has been given to a configuration for controlling the total dilute solution by the concentrated solution sent from the high-temperature regenerator to the absorber.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to increase the size of an apparatus even in a case of using steam supplied from an external heat source as a heat source. SUMMARY OF THE INVENTION An object of the present invention is to provide a steam-fired absorption chiller / heater which can control a total dilute solution with a part of a concentrated solution without performing.

It is another object of the present invention to provide a steam-fired absorption chiller / heater that stably circulates steam supplied from an external heat source at a low temperature from a high load to a partial load region.

[0013]

Means for Solving the Problems In order to achieve the above object, the structure of the invention relating to the steam-fired absorption chiller / heater of the present invention is as follows.
A high-temperature regenerator that separates refrigerant vapor from a solution by using steam supplied from an external heat source as a heating source; a low-temperature regenerator that separates refrigerant vapor from a solution by using the refrigerant vapor separated by the high-temperature regenerator as a heating source; A condenser that liquefies the refrigerant vapor separated by the regenerator, an evaporator that converts the refrigerant liquefied by the condenser into vapor, an absorber that absorbs the refrigerant vapor generated by the evaporator into a solution, and absorbs the refrigerant vapor And a piping system branched to send the diluted solution from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel, in a steam-fired absorption chiller / heater with a concentrated solution sent from the high-temperature regenerator to the absorber. In order to control the dilute solution sent to the high-temperature regenerator and low-temperature regenerator from the vessel, control means provided in the piping system before the branch is attached to the high-temperature regenerator, and the high-temperature regenerator and A drain cooler for exchanging heat between the dilute solution sent to the low-temperature regenerator and steam after heating the high-temperature regenerator is provided in the piping system before the branch, and the concentrated solution obtained by separating the dilute solution and the refrigerant before and after the control means. And a low-temperature solution heat exchanger and a high-temperature solution heat exchanger for exchanging heat respectively.

According to another aspect of the present invention, there is provided a high-temperature regenerator for separating refrigerant vapor from a solution using steam supplied from an external heat source as a heating source. And a low-temperature regenerator that separates the refrigerant vapor from the solution using the refrigerant vapor separated by the high-temperature regenerator as a heating source, a condenser that liquefies the refrigerant vapor separated by the low-temperature regenerator, and a refrigerant that is liquefied by the condenser An evaporator that converts the vapor into vapor, an absorber that absorbs the refrigerant vapor generated by the evaporator into a solution, and a dilute solution that absorbs the refrigerant vapor is sent from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In a steam-fired absorption chiller / heater equipped with a branched piping system, the concentrated solution sent from the high-temperature regenerator to the absorber controls the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator, A control means provided in the piping system at the front is attached to the high-temperature regenerator, and a drain cooler that exchanges heat between the dilute solution sent from the absorber to the low-temperature regenerator and steam after heating the high-temperature regenerator, A low-temperature solution heat exchanger and a high-temperature solution heat exchanger, which are provided in a piping system of a low-temperature regenerator after branching, and perform heat exchange between a dilute solution and a concentrated solution obtained by separating a refrigerant before and after the control means, respectively. .

Further, in order to achieve the above object,
The configuration of the invention according to the steam-fired absorption chiller / heater of the present invention includes a high-temperature regenerator that separates refrigerant vapor from a solution using steam supplied from an external heat source as a heating source, and heats the refrigerant vapor separated by the high-temperature regenerator. A low-temperature regenerator that separates refrigerant vapor from the solution as a source, a condenser that liquefies the refrigerant vapor separated by this low-temperature regenerator, an evaporator that converts the refrigerant liquefied by this condenser into vapor, and a gas that is generated by this evaporator Steam-absorbing chiller / heater comprising: an absorber for absorbing refrigerant vapor into a solution; and a piping system branched to send the dilute solution having absorbed refrigerant vapor from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In order to control the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator by the concentrated solution sent to the absorber from the high-temperature regenerator, the control means provided in the piping system before the branch is controlled by the high-temperature A drain cooler attached to the creature and exchanging heat between the dilute solution sent from the absorber to the high-temperature regenerator and steam after heating the high-temperature regenerator is provided in a piping system of the high-temperature regenerator after the branch, and the control is performed. Before and after the means, a low-temperature solution heat exchanger and a high-temperature solution heat exchanger for heat exchange between the dilute solution and the concentrated solution obtained by separating the refrigerant are provided.

Further, in order to achieve the above object,
The configuration of the invention according to the steam-fired absorption chiller / heater of the present invention includes a high-temperature regenerator that separates refrigerant vapor from a solution using steam supplied from an external heat source as a heating source, and heats the refrigerant vapor separated by the high-temperature regenerator. A low-temperature regenerator that separates the refrigerant vapor from the solution as a source, a condenser that liquefies the refrigerant vapor separated by the low-temperature regenerator, an evaporator that converts the refrigerant liquefied by the condenser into vapor, and a gas generated by the evaporator Steam-fired absorption chiller / heater comprising: an absorber that absorbs the cooled refrigerant vapor into the solution; and a piping system that branches the dilute solution that has absorbed the refrigerant vapor from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In order to control the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator by the concentrated solution sent to the absorber from the high-temperature regenerator, the control means provided in the piping system before the branch is controlled by the high-temperature A drain cooler attached to a creature and exchanging heat between the dilute solution sent from the absorber to the low-temperature regenerator and steam after heating the high-temperature regenerator is provided in a piping system of the low-temperature regenerator after the branch, and the control is performed. After the means, a low-temperature solution heat exchanger and a high-temperature solution heat exchanger for performing heat exchange between the dilute solution and the concentrated solution obtained by separating the refrigerant, respectively, are provided.

Further, in order to achieve the above object,
The configuration of the invention according to the steam-fired absorption chiller / heater of the present invention includes a high-temperature regenerator that separates refrigerant vapor from a solution using steam supplied from an external heat source as a heating source, and heats the refrigerant vapor separated by the high-temperature regenerator. A low-temperature regenerator that separates the refrigerant vapor from the solution as a source, a condenser that liquefies the refrigerant vapor separated by the low-temperature regenerator, an evaporator that converts the refrigerant liquefied by the condenser into vapor, and a gas generated by the evaporator Steam-absorbing chiller / heater comprising: an absorber for absorbing refrigerant vapor into a solution; and a piping system branched to send the dilute solution having absorbed refrigerant vapor from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In order to control the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator by the concentrated solution sent to the absorber from the high-temperature regenerator, the control means provided in the piping system before the branch is controlled by the high-temperature A drain cooler attached to the creature and exchanging heat between the diluted solution sent from the absorber and the steam after heating the high-temperature regenerator is provided in the piping system of the high-temperature regenerator further branched from the piping system before the branch, After the control means, a low-temperature solution heat exchanger and a high-temperature solution heat exchanger for exchanging heat between the dilute solution and the concentrated solution obtained by separating the refrigerant are provided.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a cycle diagram of a steam-fired absorption chiller / heater according to a first embodiment of the present invention.

The internal pressure of the evaporator 1 is maintained at about 1/100 atm. Water as the refrigerant is circulated by the refrigerant pump 2 and is sprayed on the surface of the evaporator heat transfer tube 3 in which the cold water flows. As a result, the refrigerant exchanges heat with cold water and changes its form from water to steam. The generated refrigerant vapor is sent to the absorber 4 maintained at a low pressure, and is absorbed by a solution (aqueous lithium bromide solution) sprayed on the surface of the absorber heat transfer tube 6 in which cooling water flows. The dilute solution that has absorbed the refrigerant vapor passes through the low-temperature solution heat exchanger 8 in the dilute solution pipe 7 by the solution pump 5, partially flows into the low-temperature regenerator 9 through the dilute solution pipe 7 b, and the remainder flows through the dilute solution pipe 7 a. It is sent to the high temperature regenerator 11 via the exchanger 10.

In the high-temperature regenerator 11, the diluted solution is heated by the steam flowing through the steam pipe 18 supplied from an external heat source, and separates the refrigerant vapor from the diluted solution. In the low-temperature regenerator 9, the dilute solution is separated from the dilute solution by using the refrigerant vapor generated in the high-temperature regenerator 11 as a heating source.

The concentrated solution from which the refrigerant vapor has been separated is sent from the high-temperature regenerator 11 to the high-temperature solution heat exchanger 10 through the concentrated solution pipe 12a.
, And sent to the absorber 4 through the low-temperature solution heat exchanger 8. From the low-temperature regenerator 9, the water is sent to the absorber 4 via the low-temperature solution heat exchanger 8 through the concentrated solution pipe 12 b. The refrigerant vapor generated in the low-temperature regenerator 9 is sent to the condenser 13 maintained at a low pressure, and is condensed on the surface of the absorber heat transfer tube 6 in which cooling water flows. The condensed refrigerant is sent to the evaporator 1 and goes through a cycle.

On the other hand, steam supplied from an external heat source for heating the dilute solution in the high-temperature regenerator 11 is supplied from the absorber 4 to the high-temperature regenerator 11 and the low-temperature regenerator 9 by the dilute solution pipes 7a and 7b.
Drain cooler 1 placed in the pipe before being sent by
At 9, the water is exchanged with the dilute solution by heat exchange.

The amount of steam supplied from an external heat source, which is a heating source of the high-temperature regenerator 11, is controlled by a steam control valve 15 in response to a command from the temperature controller 14. The float valve 16 is installed in the diluted solution pipe 7 sent from the absorber 4. The float box 17 is a high-temperature regenerator 1
It is installed in a concentrated solution pipe 12a supplied from 1 to the absorber 4. The float valve 16 and the float box 17 constitute control means for controlling the total dilute solution sent from the absorber 4 by the concentrated solution supplied from the high-temperature regenerator 11 to the absorber 4.

With the above configuration, the total diluted solution sent from the absorber 4 can be controlled by the concentrated solution supplied from the high-temperature regenerator 11 to the absorber 4, and necessary for exchanging heat with the total diluted solution. The amount of steam can be controlled by the steam control valve 15, and efficient operation can be performed from a high load to a partial load region. In the drain cooler 19,
Heat exchange with dilute solution enables stable water circulation at low temperature (about 90 ° C).

Embodiment 2 FIG. 2 is a cycle system diagram of a steam-fired absorption chiller / heater according to a second embodiment of the present invention.
In the figure, the same reference numerals as those in FIG. 1 denote the same parts, and a description thereof will be omitted.

The embodiment of FIG. 2 is different from the embodiment of FIG. 1 in that a drain cooler 19 is installed in a dilute solution pipe 7b sent to a low-temperature regenerator 9 so that steam supplied from an external heat source as a heating source can be removed. To perform heat exchange.

According to this embodiment, a result similar to that of the embodiment shown in FIG. 1 can be obtained.

[Embodiment 3] FIG. 3 is a cycle diagram of a steam-fired absorption chiller / heater according to a third embodiment of the present invention.
In the figure, the same reference numerals as those in FIG. 1 denote the same parts, and a description thereof will be omitted.

The embodiment of FIG. 3 is different from the embodiment of FIG. 1 in that a drain cooler 19 is installed in a dilute solution pipe 7a sent to a high-temperature regenerator 11 to exchange heat with high-temperature steam as a heating source. It is in.

According to this embodiment, the same result as that of each embodiment of FIG. 1 can be obtained.

Fourth Embodiment FIG. 4 is a cycle diagram of a steam-fired absorption chiller / heater according to a fourth embodiment of the present invention.
In the figure, components having the same reference numerals as those in FIG.

The embodiment of FIG. 4 differs from the embodiment of FIG. 1 in that the dilute solution from the absorber 4 is directly supplied to the float valve 16.
After passing through the float box 17, the partially diluted solution is sent to the high-temperature regenerator 11 through the low-temperature solution heat exchanger 8 and the high-temperature solution heat exchanger 10, and the rest is sent to the low-temperature regenerator 9. is there. And drain cooler 1
9 is provided in the dilute solution pipe 7b sent to the low-temperature regenerator 9 to perform heat exchange with steam supplied from an external heat source as a heating source.

According to this embodiment, the same result as that of each embodiment shown in FIG. 1 can be obtained.

[Embodiment 5] FIG. 5 is a cycle system diagram of a steam-fired absorption chiller / heater according to a fifth embodiment of the present invention.
In the figure, components having the same reference numerals as those in FIG.

The embodiment of FIG. 5 is different from the embodiment of FIG. 1 in that first, the entire dilute solution from the absorber 4 is directly sent to a float box 17 having a float valve 16, and after passing through the float box 17, a part thereof is partially removed. Dilute solution is directly supplied to high-temperature regenerator 11
And the rest are the low-temperature solution heat exchanger 8 and the high-temperature solution heat exchanger 1
0 to the high-temperature regenerator 11. Then, the drain cooler 19 is provided in the dilute solution pipe 7c for sending the liquid to the high temperature regenerator 11, and performs heat exchange with steam supplied from an external heat source which is a heating source.

According to this embodiment, the same result as that of each embodiment shown in FIG. 1 can be obtained.

[0038]

As described above in detail, according to the present invention, by controlling the total dilute solution with a part of the concentrated solution, the steam-fired method having excellent operation characteristics from a high load to a partial load region can be obtained. An absorption chiller / heater can be provided.

Further, it is possible to provide a steam-fired absorption chiller / heater capable of stably circulating steam supplied from an external heat source at a low temperature (about 90 ° C.).

[Brief description of the drawings]

FIG. 1 is a cycle system diagram of a steam-fired absorption chiller / heater according to a first embodiment of the present invention.

FIG. 2 is a cycle diagram of a steam-fired absorption chiller / heater according to a second embodiment of the present invention.

FIG. 3 is a cycle diagram of a steam-fired absorption chiller / heater according to a third embodiment of the present invention.

FIG. 4 is a cycle system diagram of a steam-fired absorption chiller / heater according to a fourth embodiment of the present invention.

FIG. 5 is a cycle diagram of a steam-fired absorption chiller / heater according to a fifth embodiment of the present invention.

FIG. 6 is a cycle diagram of a conventional general steam-fired absorption chiller / heater.

[Description of Signs] 1 Evaporator 2 Refrigerant pump 3 Evaporator heat transfer tube 4 Absorber 5 Solution pump 6 Absorber heat transfer tube 7, 7a, 7b, 7c Dilute solution pipe 8 Low temperature solution heat exchanger 9 Low temperature regenerator 10 High temperature solution Heat exchanger 11 High temperature regenerator 12, 12a, 12b Concentrated solution pipe 13 Condenser 14 Temperature controller 15 Steam control valve 16 Float valve 17 Float box 18 Steam pipe supplied from external heat source 19 Drain cooler

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shuichiro Uchida 603, Kandamachi, Tsuchiura-shi, Ibaraki F-term in Tsuchiura Plant, Hitachi, Ltd. 3L093 BB11 BB23 BB29 BB31 BB32 EE25 GG04 HH02 JJ02 LL03 MM07

Claims (5)

[Claims] 1. A high-temperature regenerator for separating refrigerant vapor from a solution using steam supplied from an external heat source as a heating source, and a low-temperature regeneration for separating refrigerant vapor from a solution using the refrigerant vapor separated by the high-temperature regenerator as a heating source. A condenser that liquefies the refrigerant vapor separated by the low-temperature regenerator, an evaporator that converts the refrigerant liquefied by the condenser into vapor, and an absorber that absorbs the refrigerant vapor generated by the evaporator into a solution. A steam-fired absorption chiller / heater comprising a piping system for branching the dilute solution having absorbed the refrigerant vapor from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In order to control the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator by the concentrated solution, a control means provided in the piping system before the branch is attached to the high-temperature regenerator, from the absorber A drain cooler for exchanging heat between the dilute solution sent to the hot regenerator and the low temperature regenerator and steam after heating the high temperature regenerator is provided in the piping system before the branch, and the dilute solution and the refrigerant before and after the control means are provided. A steam-fired absorption chiller / heater comprising a low-temperature solution heat exchanger and a high-temperature solution heat exchanger for exchanging heat with the separated concentrated solution, respectively. 2. A high-temperature regenerator for separating refrigerant vapor from a solution using steam supplied from an external heat source as a heating source, and a low-temperature regeneration for separating refrigerant vapor from a solution using the refrigerant vapor separated by the high-temperature regenerator as a heating source. A condenser that liquefies the refrigerant vapor separated by the low-temperature regenerator, an evaporator that converts the refrigerant liquefied by the condenser into vapor, and an absorber that absorbs the refrigerant vapor generated by the evaporator into a solution. A steam-fired absorption chiller / heater comprising a piping system for branching the dilute solution having absorbed the refrigerant vapor from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In order to control the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator by the concentrated solution, a control means provided in the piping system before the branch is attached to the high-temperature regenerator. The Dorenkura for heat exchange and steam after heating the diluted solution to be sent to the hot regenerator the high temperature generator,
It is provided in a piping system of the low-temperature regenerator after the branching, and a low-temperature solution heat exchanger and a high-temperature solution heat exchanger for performing heat exchange between the dilute solution and the concentrated solution obtained by separating the refrigerant before and after the control means, respectively. Features a steam-fired absorption chiller / heater. 3. A high-temperature regenerator for separating refrigerant vapor from a solution using steam supplied from an external heat source as a heating source, and a low-temperature regeneration for separating refrigerant vapor from a solution using the refrigerant vapor separated by the high-temperature regenerator as a heating source. A condenser that liquefies the refrigerant vapor separated by the low-temperature regenerator, an evaporator that converts the refrigerant liquefied by the condenser into vapor, and an absorber that absorbs the refrigerant vapor generated by the evaporator into a solution. A steam-fired absorption chiller / heater comprising a piping system for branching the dilute solution having absorbed the refrigerant vapor from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In order to control the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator by the concentrated solution, a control means provided in the piping system before the branch is attached to the high-temperature regenerator. The Dorenkura for heat exchange and steam after heating the diluted solution to be sent to the hot regenerator the high temperature generator,
It is provided in a piping system of the high-temperature regenerator after the branch, and a low-temperature solution heat exchanger and a high-temperature solution heat exchanger for performing heat exchange between the dilute solution and the concentrated solution obtained by separating the refrigerant before and after the control means, respectively. Features a steam-fired absorption chiller / heater. 4. A high-temperature regenerator for separating refrigerant vapor from a solution using steam supplied from an external heat source as a heating source, and a low-temperature regeneration for separating refrigerant vapor from a solution using the refrigerant vapor separated by the high-temperature regenerator as a heating source. A condenser that liquefies the refrigerant vapor separated by the low-temperature regenerator, an evaporator that converts the refrigerant liquefied by the condenser into vapor, and an absorber that absorbs the refrigerant vapor generated by the evaporator into a solution. A steam-fired absorption chiller / heater comprising a piping system for branching the dilute solution having absorbed the refrigerant vapor from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In order to control the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator by the concentrated solution, a control means provided in the piping system before the branch is attached to the high-temperature regenerator, from the absorber The Dorenkura for heat exchange and steam after heating the diluted solution to be sent to the hot regenerator the high temperature generator,
It is provided in the piping system of the low-temperature regenerator after the branching, and after the control means, a low-temperature solution heat exchanger and a high-temperature solution heat exchanger that exchange heat respectively with the diluted solution and the concentrated solution obtained by separating the refrigerant are provided. Features a steam-fired absorption chiller / heater. 5. A high-temperature regenerator for separating refrigerant vapor from a solution using steam supplied from an external heat source as a heating source, and a low-temperature regeneration for separating refrigerant vapor from a solution using the refrigerant vapor separated by the high-temperature regenerator as a heating source. A condenser that liquefies the refrigerant vapor separated by the low-temperature regenerator, an evaporator that converts the refrigerant liquefied by the condenser into vapor, and an absorber that absorbs the refrigerant vapor generated by the evaporator into a solution. A steam-fired absorption chiller / heater comprising a piping system for branching the dilute solution having absorbed the refrigerant vapor from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In order to control the dilute solution sent from the absorber to the high-temperature regenerator and the low-temperature regenerator by the concentrated solution, a control means provided in the piping system before the branch is attached to the high-temperature regenerator, from the absorber A drain cooler for exchanging heat between the diluted solution and the steam after heating the high-temperature regenerator is provided in a piping system of the high-temperature regenerator further branched from the piping system before the branch, and the diluted solution and the refrigerant after the control means. A steam-fired absorption chiller / heater comprising a low-temperature solution heat exchanger and a high-temperature solution heat exchanger for exchanging heat with the concentrated solution from which the water has been separated.