JP2894974B2 - Absorption chiller / heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-quality fuel system and an exhaust heat utilization system, and an external exhaust heat (for example, a cogeneration system) via a heat exchanger interposed in a pipe of the exhaust heat utilization system. And the like, which is supplied with a fluid at 30 ° C. to 120 ° C., hot water, steam or the like generated from the above.

[0002]

2. Description of the Related Art With respect to such technology, the present applicant has filed Japanese Patent Application No.
No. 73428 will be described.

In FIG. 6, an absorption chiller / heater 1 comprises an evaporator 2, an absorber 3, a high temperature regenerator 10, a low temperature regenerator 14, a condenser 4, a high temperature solution heat exchanger 15, a low temperature solution heat exchanger 16,
A refrigerant pump P2, a solution pump P3, and various lines connecting these members are provided. Further, a chilled water line 5 for supplying chilled water to a cooling load (not shown) and a fuel line 23 for supplying high quality fuel to a heating source (for example, a gas burner) for the high temperature regenerator 10 are provided. Further, a cooling water line 6 for supplying cooling water to the absorber 3 and the condenser 4 is provided, and circulates cooling water cooled by a cooling tower (not shown).

A heat source heat exchanger 20A is interposed in the absorption solution line L1 between the high-temperature solution heat exchanger 15 and the low-temperature solution heat exchanger 16. 20A, the hot waste water flowing through the exhaust heat input line 22 of the cogeneration system (not shown) and the absorber 3
Exchange heat with the absorbing solution flowing through the absorbing solution line L1 via the pump P3. More specifically, for example, 85
A part of the amount of heat of the waste water at a temperature of 120 ° C. to 120 ° C. is transmitted to the absorbing solution flowing through the absorbing solution line L1 by the heat source heat exchanger 20A, thereby consuming high-cost high-quality fuel. Is to be reduced.

[0005]

The technique proposed above is very effective. However, in recent years, demands for energy saving are severe, and a reduction rate of high-quality fuel consumption is demanded to be about 20% to 40%. On the other hand, in the above-described conventional technology, the reduction rate of high-quality fuel at the time of rating is about 12%, and it is difficult to cope with the strict requirements described above.

In addition to the above problems, there are also the following problems. As a standard of the cold / hot water line 5 in the absorption cold / hot water machine 1 as shown in FIG. 6, for example, the cold / hot water inlet temperature T _Lin is 12 ° C., and the cold / hot water outlet temperature T _Lout is 7 ° C. The high-temperature regenerator 10 and the burner 11 for high-quality fuel combustion installed in the high-temperature regenerator 10 are designed on the basis of this temperature condition without exhaust heat being supplied.

Here, there is a case where the temperature of the high-temperature regenerator 10 rises as compared with the case where the operation is performed according to the above-mentioned standard or standard. For example, when an excessive load is applied by the refrigeration load connected to the cold / hot water line 5, the cold / hot water inlet temperature T _Lin is higher than 12 ° C. (for example, 13 ° C.).
° C). In order to set the cold / hot water outlet temperature T _Lout to 7 ° C. in such an overload state, it is necessary to perform a higher load operation or an overload operation than in the reference operation. (Specified value in). Further, even when the cooling water temperature T _Min returning from the cooling tower (not shown) provided in the cooling water line 6 to the chiller / heater 1 rises above a set value, the temperature of the high temperature regenerator 10 rises above a specified value. I do. And such a high temperature regenerator 10
Is remarkable in the exhaust heat input operation mode in which external exhaust heat is input.

However, when the temperature of the high-temperature regenerator 10 rises above a specified value, there is a problem that the corrosion of the high-temperature regenerator 10 is accelerated.

On the other hand, a technique has been proposed in which a limiter is provided, and when the temperature of the high-temperature regenerator 10 rises above a specified value, the operation of the high-temperature regenerator 10 is stopped by the action of the limiter. However, when such a technology is adopted, the performance of the chiller / heater 1 is drastically reduced due to the stoppage of the operation of the high-temperature regenerator 10, which causes a problem that the smooth operation of the chiller / heater 1 is hindered. I do.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and further increases the waste heat utilization rate to reduce the consumption of high quality fuel. It is an object of the present invention to provide an absorption chiller / heater that prevents the accompanying corrosion and does not drastically reduce its capacity.

[0011]

[Knowledge] In the above prior art, the heat exchange performed by the heat source heat exchanger 5 interposed in the dilute solution line L1 is performed in a liquid phase
Sensible heat and sensible heat exchange between liquid phases. On the other hand, as a result of various studies, the present inventor has found that when a dilute solution is decompressed and sent to a heat exchanger, a part of the dilute solution undergoes a phase change (evaporation) and deprives the heat exchanger of heat of vaporization, that is, latent heat. We paid attention to sensible heat and latent heat exchange. When such sensible heat / latent heat exchange is performed, more heat is transferred from the hot wastewater side to the absorption solution side as compared to sensible heat / sensible heat exchange, which is heat exchange between liquid phases. Moved and found that the heat exchange efficiency was improved. Further, in the exhaust heat input operation mode, it is not necessary to operate the high quality fuel combustion burner 100%, and the exhaust heat is assigned to a part of the load, and the high quality fuel combustion burner is assigned to the remaining part. We focused on what should be done. The present invention has been made based on these findings.

[0012]

SUMMARY OF THE INVENTION An absorption chiller / heater according to the present invention is an absorption chiller / heater having a high temperature regenerator and a low temperature regenerator, wherein the absorption solution for communicating the high temperature regenerator or the absorber with the low temperature regenerator is provided. The line is provided with a pressure adjusting means and an intermediate regenerator, and the intermediate regenerator performs sensible heat / latent heat exchange between the fluid supplied from the external heat source and the absorbing solution flowing through the absorbing solution line, and discharges heat. It has a control device that determines the closing operation mode and the normal operation mode based on a predetermined signal, and the control device includes:
In each mode, the opening of the high-quality fuel adjustment throttle valve and the combustion air adjustment throttle valve of the high-quality fuel combustion burner installed in the high-temperature regenerator is automatically adjusted.

When the absorption chiller / heater of the present invention is implemented, a three-way valve open / closed state detecting means for detecting an open / closed state of a three-way valve interposed in the exhaust heat supply line is provided. A control signal is output to the opening upper limiter provided in the adjusting throttle valve and the opening upper limiter provided in the combustion air adjusting throttle valve, and a detection signal from the three-way valve opening / closing state detecting means is output. Preferably, it is configured to input.

In this case, a cold / hot water line outlet temperature detecting means for detecting the outlet temperature of the cold / hot water line, a high temperature regenerator temperature detecting means for detecting the temperature of the high temperature regenerator, and a high temperature regeneration for detecting the pressure of the high temperature regenerator. And a cooling water line inlet temperature detecting means for detecting an inlet temperature of the cooling water line, wherein a detection signal from each of the detecting means is output to the control device. Preferably.

According to the present invention having the above-described structure, by performing sensible heat / latent heat exchange in which the amount of heat transfer is large, compared with the conventional sensible heat / sensible heat exchange only technology, More heat can be supplied from the exhaust heat into the absorption chiller / heater. As a result, it is possible to increase the waste heat utilization rate and reduce the consumption of high quality fuel, and approach the target value of 20 to 40%.

More specifically, according to the present invention, the pressure is reduced by interposing a pressure adjusting means such as a pressure reducing valve in the absorbing solution line, so that the pressure of the absorbing solution passing through the pressure adjusting means is reduced. And the regeneration temperature decreases.
Therefore, a part of the absorbing solution is vaporized in the intermediate regenerator due to the amount of heat held by the fluid (warm water) supplied from the external heat source. That is, in the intermediate regenerator, sensible heat / latent heat exchange is performed between the hot waste water and the absorbing solution.

Here, sensible heat / latent heat exchange involves a larger amount of heat exchanged or moved than sensible heat / sensible heat exchange. Therefore,
According to the present invention, by performing sensible heat / latent heat exchange in which the amount of transferred heat is large, more heat can be transferred from the hot wastewater to the absorbing solution side (compared to the conventional sensible heat / sensible heat exchange only technology). That is, it is thrown into the absorption chiller / heater. As a result, the amount of expensive high-quality fuel used can be reduced.

After the sensible heat / latent heat exchange, the solution
A part is a two-phase flow of a gas phase and a part is a liquid phase, and flows into downstream equipment.

According to the three-way valve open / closed state detecting means, the three-way valve interposed in the exhaust heat supply line is open to the side to supply exhaust heat (exhaust heat supply side) or does not supply exhaust heat. It is detected whether it is open on the side (the side that bypasses the exhaust heat exchanger and the intermediate regenerator). According to this detection result,
The operation mode at the time of detection is an exhaust heat input operation mode (an operation mode in which the three-way valve is open to the exhaust heat input side, that is, an exhaust heat supply side): an exhaust heat single firing operation mode or an exhaust heat plus high quality Fuel burning operation mode) or normal operation mode (operation mode in which the three-way valve is open to the side that does not supply exhaust heat, that is, the side that bypasses the exhaust heat exchanger): single high-quality fuel operation Mode).

When the control device determines that the operation mode is the exhaust heat input operation mode (exhaust heat alone firing mode or the exhaust heat plus high quality fuel firing operation mode), the high quality fuel combustion installed in the high temperature regenerator is determined. Of the opening limiter for the high-quality fuel adjustment throttle valve and the opening limit upper limiter for the combustion air adjustment throttle valve of the burner are controlled so that the opening of each adjustment valve does not exceed a predetermined value. . That is, when exhaust heat is supplied, the burner for high-quality fuel combustion does not operate 100%, and operation is suppressed to a level corresponding to the remaining load in which part of the load is assigned to exhaust heat. . as a result,
Acceleration of corrosion due to a rise in the temperature of the high-temperature regenerator is prevented.

Further, in the present invention, a cold / hot water line outlet temperature detecting means for detecting the outlet temperature of the cold / hot water line, a high temperature regenerator temperature detecting means for detecting the temperature of the high temperature regenerator, and a high temperature regeneration for detecting the pressure of the high temperature regenerator. If the control device is configured to transmit a detection signal from the pressure sensor detecting means and the cooling water line inlet temperature detecting means for detecting an inlet temperature of the cooling water line to the control device, the control device detects the three-way valve opening / closing state. Based on not only the detection signal of the means but also the high-quality fuel single-burning operation mode, the exhaust heat only-burning operation mode, and the exhaust heat plus high-quality fuel-burning operation mode based on the detection signals of the above-described detection means, The upper limiters of the high-quality fuel adjustment burner and the combustion air adjustment throttle valve of the high-quality fuel combustion burner installed in the vessel are controlled to operate.

According to the present invention, the operation of the limiter for the high-quality fuel adjustment throttle valve and the operation of the limiter for the combustion air adjustment throttle valve of the high-quality fuel combustion burner can be automatically controlled in accordance with the operating conditions. When an over-refrigeration load is applied or when the cooling water temperature rises above a set value, the opening upper limiter for the high-quality fuel adjustment throttle valve and the opening upper limiter for the combustion air adjustment throttle valve are set. The temperature of the high-temperature regenerator is suppressed to a specified value or less by controlling the supply amount of high-quality fuel or combustion air automatically, thereby suppressing corrosion.

Particularly, in the present invention in which the intermediate regenerator is provided as described above and the efficiency of inputting the exhaust heat is extremely good, the temperature rise of the high temperature regenerator 10 is higher than that of the conventional absorption chiller / heater (exhaust heat). (In the make-up mode). Therefore, it is extremely effective to prevent the high-quality fuel combustion burner from operating 100%, thereby preventing the corrosion of the high-temperature regenerator from accelerating due to a rise in temperature.

Further, by detecting the outlet temperature of the cold / hot water line, the temperature or pressure of the high-temperature regenerator, and the inlet temperature of the cooling water line, the opening upper limiter for the high-quality fuel regulating throttle valve and the combustion air It is also possible to adjust each of the set values of the opening upper limiter for the adjustment throttle valve as a parameter.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In these drawings,
Parts corresponding to those in FIG. 6 are denoted by the same reference numerals, and redundant description is omitted.

First, an absorption chiller / heater proposed by the present applicant will be described with reference to FIG. Here, the absorption chiller / heater shown in FIG. 1 is a modification of a so-called “parallel flow” type,
The “series flow” type and “reverse flow” type absorption chiller / heater are also configured as shown in the illustrated embodiment,
The operation is substantially the same. Therefore, "Series Flow"
The illustration of the overall configuration of the type, “reverse flow” type absorption chiller / heater is omitted.

In FIG. 1, a branch point 17 is provided between the high-temperature solution heat exchanger 15 and the low-temperature solution heat exchanger 16 of the absorption solution line L1, and a branch line L2 from the branch point 17 to the low-temperature regenerator 14 is provided. Is branched. The branch line L2 is provided with a pressure reducing valve 18 as pressure adjusting means and an intermediate regenerator 20. A waste heat input line 22 is connected to the intermediate regenerator 20, and sensible heat / latent heat exchange is performed between hot waste water in the waste heat input line 22 and an absorbing solution (dilute solution) in the branch line L2. It is configured as follows.
Here, since the flow rate and the pressure in the circulation system of the absorption chiller / heater need to be finely adjusted, the pressure reducing valve 18 as the pressure adjusting means is not only used as a pressure adjusting means but also as a flow adjusting means. It also has a role.

In FIG. 1, a control device 3 as a control means is shown.
The control device 30A includes a high-quality fuel supply control valve 12, a three-way valve V1 provided at the junction of the exhaust heat input line 22 and the exhaust heat line 21 and having an adjustable flow rate, and an exhaust heat input line. 22, a temperature sensor 31 for detecting the hot water inlet temperature Th, a temperature sensor 32 for detecting the outlet temperature _TLout of the cold / hot water line 5, a temperature sensor 41 for detecting the inlet temperature of the cold / hot water line 5, and a temperature of the high temperature regenerator 10. A temperature sensor 33 for detecting T _H , a pressure sensor 34 for detecting the pressure P _H of the high-temperature regenerator 10, a temperature sensor 40 for detecting the inlet temperature T _MIN of the cooling water line 6, and the pressure reducing valve 18 are respectively connected.

In FIG. 2, a burner 11 for high quality fuel combustion
Is provided with a throttle valve 12 for high quality fuel adjustment and a throttle valve 13 for combustion air adjustment. The throttle valves 12 and 13 have an opening upper limiter 42 for the throttle valve 12 for high quality fuel adjustment. ,
An opening upper limiter 43 for the throttle valve 13 for adjusting combustion air is provided. However, the throttle valves 12, 13
Opening limiters 42 and 43 are provided not only at the positions of the respective throttle valves 12 and 13 but also at the positions indicated by reference numerals 42A and 43A on the upstream side of the throttle valve or the reference numeral 42B on the downstream side of the throttle valve. , 43B.

The throttle valves 12, 13 are connected to a control device 30 via signal transmission lines SL1, SL2 shown by dotted lines in FIG. 2, and receive control signals from the control device.
Further, the control device 30 is configured to output an open / close signal from a three-way valve open / closed state detecting means (not shown in FIG. 2) of the three-way valve V1 via the signal transmission line SL3.

Next, the control mode will be described with reference to FIG. The control device 30 detects the hot / drain water inlet temperature Th, the cold / hot water inlet temperature T _{Lin, the} cold / hot water outlet temperature _{TLout, and the} like (step S1), and determines whether or not the operation mode is the high-quality fuel single combustion operation (step S1). S2). Specifically, when the temperature of the hot waste water is extremely low as compared with the absorption solution and there is a possibility that the amount of heat held by the absorption solution may flow back to the hot waste water side, the operation mode in which the waste heat is not supplied, the high quality fuel alone Select the boil operation mode. Then, if step S2 is YES, that is, the state in which the warm drainage flowing through the exhaust heat line 21 is not injected at all into the exhaust heat input line 22 or the chiller / heater 1 side, in other words, the three-way valve V1 is fully opened to the bypass side. If so, it is determined that the high-quality-fuel-only-fired operation mode is set (step S7).

On the other hand, if step S2 is NO, that is, if the three-way valve V1 is not fully opened to the bypass side, it is determined whether or not the exhaust heat only operation is performed (step S3).
In other words, it is determined whether or not sufficient refrigeration capacity or heating capacity can be exerted with respect to the thermal load only by warm exhaust heat. Then, if the thermal load can be covered only by the exhaust heat (YES in step S3), it is determined that the operation mode is the exhaust heat only operation mode (step S4). Here, in the exhaust-heat-only-fired operation mode, the high-temperature regenerator 10 is not heated or input by the burner 11 and is not controlled by the present invention.

On the other hand, if the thermal load cannot be satisfied only by the exhaust heat, that is, if step S3 is NO, it is determined that the operation mode is the exhaust heat plus high quality fuel burning operation mode (step S3).
5). If it is determined that the operation mode is the exhaust heat plus high quality fuel burning operation mode, the high quality fuel combustion burner does not operate 100%, and a level corresponding to the remaining load in which a part of the load is assigned to the input exhaust heat. It is necessary to suppress the increase in the temperature of the high-temperature regenerator 10 to prevent the promotion of corrosion. Therefore, the opening upper limiters 42 and 43 are set, and the throttle valve 1 is set.
The opening degrees of 2, 13 are prevented from becoming larger than a predetermined value (step S6). Here, the predetermined value of the degree of opening of the throttle valves 12 and 13 is determined on a case-by-case basis based on whether or not corrosion is promoted due to a rise in the temperature of the high-temperature regenerator 10.

If it is determined that the operation mode is the single high quality fuel burning operation mode (step S7), the burner for high quality fuel combustion is set to 100
% Operation is within the specification of the high-temperature regenerator 10,
Since there is no need to consider “promotion of corrosion due to a rise in temperature of the high-temperature regenerator”, the opening upper limiters 42 and 43 are released (step S4).

Next, a second embodiment of the present invention will be described with reference to FIG. The cold / hot water line 5 has a cold / hot water line outlet temperature detecting means 46 for detecting its outlet temperature T _Lout.
Is interposed. The high temperature regenerator 10 has its temperature T _H
High temperature regenerator temperature detecting means 48 for detecting the pressure P
A high temperature regenerator pressure detecting means 50 for detecting _H is provided. The cooling water line 6 has an inlet temperature T
A cooling water line inlet temperature detecting means 52 for detecting _Min is interposed. These detecting means 46, 48, 50, 5
The detection results of No. 2 are sent to the control device 30 via signal transmission lines SL11 to SL14 indicated by dotted lines, respectively.

Next, the control in the embodiment shown in FIG. 4 will be described with reference to FIG. The control device 30, the outlet temperature T _Lout of the hot and cold water line 5, the temperature and pressure P _H of the high-temperature regenerator 10 detects the inlet temperature T _Min of the cooling water line 6 (step S1A), the same steps as FIG. 3 The operation mode is determined by S2 to S5 and S7.

In the exhaust heat plus high-quality fuel burning operation mode (step S5), the control device 30 executes step S1A.
In the temperature T _H of the detected high-temperature regenerator 10, high temperature regenerator 1
It is determined whether the pressure P _{H of} 0 and the inlet temperature T _Min of the cooling water line 6 are higher than the set values in the exhaust heat input operation mode (step S10). If it is higher than the set value (YES in step S10), the temperature of the high-temperature regenerator rises, and there is a high possibility that adverse effects such as corrosion will occur. Therefore, the upper limit limiters 42 and 44 are controlled to control the throttle valve. Control is performed in the direction in which steps 12 and 13 are reduced (step S11).

On the other hand, the temperature T _{H of} the high-temperature regenerator 10, the pressure P _H of the high-temperature regenerator 10, and the inlet temperature T _Min of the cooling water line 6.
However, if it is lower than the set value of the exhaust heat plus high-quality fuel burning operation mode (NO in step S10), the temperature of the high-temperature regenerator does not rise, and there is little possibility that adverse effects such as corrosion will occur. Then, it is determined whether or not the outlet temperature _TL of the cold / hot water line 5 is higher than a set value (in this case, the set value of the exhaust heat plus the high quality fuel burning operation mode) (step S12). It is determined whether the refrigeration capacity is sufficient for the thermal load.

If the outlet temperature T _Lout of the cold / hot water line 5 is higher than the set value of the exhaust heat plus the high quality fuel burning operation mode (YES in step S12), the current refrigerating capacity is insufficient for the thermal load. Therefore, the opening upper limiter 42,
44 is controlled to the release side, and the throttle valves 12, 13 are controlled to open (step S13).

On the other hand, if the chilled / hot water line outlet temperature T _Lout is lower than the set value of the exhaust heat plus the high quality fuel burning operation mode (NO in step S12), the current refrigeration capacity is sufficient for the thermal load. . In this case, in order to save the consumption of high-quality fuel, in step S11, the upper limit limiters 42 and 44 are controlled to adjust the throttle valves 12 and 13 to the throttle side.

If it is determined that the operation mode is the single high quality fuel burning operation mode (step S17), the burner for high quality fuel combustion is set to 10
Even if 0% operation is performed, the operation is within the standard of the high-temperature regenerator 10,
There is no need to consider “promotion of corrosion due to a rise in temperature of the high-temperature regenerator”, and the opening limiter is released (step S7).
1). Then, in a state where the opening degree of the limiter is maximized, the operation is performed by the control by the normal opening and closing of the throttle valve.

[0042]

As described above, the present invention is constructed as described above, so that the waste heat utilization rate is further increased by the intermediate regenerator to reduce the consumption of high quality fuel. By determining whether the operation mode is the waste heat plus high quality fuel burning operation mode or the high quality fuel single combustion operation mode, and controlling the combustion of the high quality fuel combustion burner, the temperature rise of the high temperature regenerator and the accompanying temperature rise Corrosion can be prevented so that the capacity of the absorption chiller / heater is not drastically reduced.

In addition, more precise control is performed by judging the operating state of the absorption chiller / heater.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an absorption chiller / heater previously applied by the present applicant.

FIG. 2 is a block diagram showing a first embodiment of the present invention.

FIG. 3 is a control flowchart of FIG. 2;

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is a control flowchart of FIG. 4;

FIG. 6 is a block diagram showing an example of a conventional absorption chiller / heater.

[Explanation of symbols]

V1: Three-way valve P _H: High-temperature regenerator pressure T _H: High-temperature regenerator temperature T _{Lout: Cooling} / heating water line outlet temperature 1: Absorption cooling / heating machine 2: Evaporation Unit 3 ・ ・ ・ Absorber 4 ・ ・ ・ Condenser 5 ・ ・ ・ Cool and hot water line 6 ・ ・ ・ Cooling water line 10 ・ ・ ・ High temperature regenerator 11 ・ ・ ・ High quality fuel combustion burner 12 ・ ・ ・ High quality fuel Throttle valve for adjustment 13 ・ ・ ・ Throttle valve for combustion air adjustment 14 ・ ・ ・ Low temperature regenerator 15 ・ ・ ・ High temperature solution heat exchanger 16 ・ ・ ・ Low temperature solution heat exchanger 17 ・ ・ ・ Branch point 18 ・ ・ ・ Decompression Valve 20: Intermediate regenerator 20A: Heat source-like heat exchanger 21: Exhaust heat line 22: Exhaust heat input line 23: High quality fuel line 30, 30A: Control device 31 , 32, 33, 40, 42 ... temperature sensor 34 ... pressure sensor 42, 42A, 42B ... high Opening upper limiter for fuel regulating throttle valve 43, 43A, 43B ... Opening upper limiter for combustion air regulating throttle valve 46 ... Cold / hot water line outlet temperature detecting means 48 ... High temperature regenerator temperature Detecting means 50 ... High temperature regenerator pressure detecting means 52 ... Cooling water line inlet temperature detecting means SL1-3, SL11-14 ... Signal transmission line

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F25B 15/00 306 F25B 15/00 303

Claims (3)

(57) [Claims] 1. An absorption chiller / heater having a high temperature regenerator and a low temperature regenerator, wherein a pressure adjusting means and an intermediate regenerator are interposed in an absorption solution line connecting the high temperature regenerator or the absorber and the low temperature regenerator. The intermediate regenerator performs sensible heat / latent heat exchange between a fluid supplied from an external heat source and an absorbing solution flowing through an absorbing solution line, and determines a waste heat input operation mode and a normal operation mode based on a predetermined signal. The control device automatically adjusts the opening degree of the high-quality fuel adjustment throttle valve and the combustion air adjustment throttle valve of the high-quality fuel combustion burner installed in the high-temperature regenerator for each mode. An absorption chiller / heater characterized by being configured to be adjusted in a controlled manner. 2. A three-way valve open / closed state detecting means for detecting an open / closed state of a three-way valve interposed in an exhaust heat supply line, wherein the control device is provided with an open / closed state provided in a high quality fuel regulating throttle valve. A control signal is output to the opening upper limiter and the opening upper limiter provided in the combustion air regulating throttle valve, and a detection signal from the three-way valve opening / closing state detecting means is inputted. Item 1. Absorption chiller / heater of item 1. 3. A hot / cold water line outlet temperature detecting means for detecting a cold / hot water line outlet temperature, a high temperature regenerator temperature detecting means for detecting a high temperature regenerator temperature, and a high temperature regenerator for detecting a pressure of the high temperature regenerator. Pressure detecting means, and a cooling water line inlet temperature detecting means for detecting an inlet temperature of the cooling water line, wherein a detection signal from each of the detecting means is output to the control device. The absorption chiller / heater according to claim 2.