JPH08170862A - Compound cooler and control method thereof - Google Patents

Abstract

PURPOSE: To prevent crystallization effectively inside a high temperature waste heat exchanger and a low temperature waste heat exchanger. CONSTITUTION: The generation of an operation stop signal of a solution pump or a heating means 100 is detected and a control signal is outputted to three-way valves V1 and V2 from a control means 50 after a specified time passes from the stoppage thereof to bypass hot water to a high temperature waste heat exchanger 30 and a low temperature waste heat exchanger 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined cooling apparatus using hot water or steam of a two-temperature level exhaust heat source and a control method thereof.

[0002]

2. Description of the Related Art A high temperature regenerator, a low temperature regenerator, a low temperature solution heat exchanger, a high temperature solution heat exchanger and a dilute solution line of an absorbent which communicates with the high temperature regenerator are provided. The heat heat exchanger and the low temperature exhaust heat heat exchanger are respectively installed,
The high temperature exhaust heat heat exchanger and the low temperature exhaust heat heat exchanger are combined cooling apparatuses for exchanging heat between a high temperature fluid and a low temperature fluid respectively supplied from a two temperature level exhaust heat source other than an absorption refrigerator and a dilute absorbent solution. For example, there is one disclosed in Japanese Patent Application No. 6-8314 filed by the applicant earlier.

This will be described with reference to FIG. 10. A gas fired absorption chiller / heater (WGAF) 2 equipped with an exhaust heat input heat exchanger.
0 is an evaporator 9, an absorber 10, a high temperature regenerator 11, a low temperature regenerator 12, a condenser 13, a high temperature solution heat exchanger 14, a low temperature solution heat exchanger 15, a refrigerant pump P9, a solution pump P10, and these members. The cooling water is supplied to a cooling load (not shown) via the cold water line 6 including the respective lines connecting to each other. Further, a cooling water line CL for supplying cooling water to the absorber 10 and the condenser 13 is provided. Further, the high temperature regenerator 11 is connected to a fuel line 21 for supplying high quality fuel to the heating burner 100 which is a heating means.

[0004] The high temperature solution heat exchanger 14 and the high temperature regenerator 11 in the absorbent dilute solution line L1 communicating the low temperature solution heat exchanger 15, the high temperature solution heat exchanger 14 and the high temperature regenerator 11 described above.
A high temperature exhaust heat heat exchanger 30 is interposed between the heat exchangers 1 and 2, and a low temperature exhaust heat heat exchanger 34 is interposed between the heat exchangers 14 and 15.

The hot exhaust heat exchanger 30 is supplied with pressurized water of, for example, 120 ° C. or higher of the fuel cell FC through the hot water line 2, and the low temperature exhaust heat exchanger 34 is fed to the fuel cell FC.
The hot water of 80 ° C. to 120 ° C. is supplied through the hot water line 3. The heat source is not limited to the fuel cell, and high-temperature exhaust heat of pressurized water of 120 ° C. or higher or steam of 3 kg or higher and hot water of 80 ° C. to 120 ° C. or 1 to
It suffices to supply low-temperature exhaust heat of 3 kg of steam, and gas engine exhaust heat, factory process exhaust heat, gas turbine exhaust heat, etc. are used.

Therefore, the dilute solution of the absorbent discharged from the low temperature solution heat exchanger 15 is heated in the low temperature waste heat heat exchanger 34 by 80
The temperature is raised by the amount of heat of warm water of ℃ to 120 ℃ and enters the high temperature solution heat exchanger 14. The dilute solution discharged from the heat exchanger 14 is further heated in the high temperature exhaust heat heat exchanger 30 by the amount of heat of the pressurized water of 120 ° C. or higher and enters the high temperature regenerator 11.

[0007]

In the absorption refrigerating machine constituting the composite cooling device, the solution pump is responsive to various signals generated during operation (detection signal of cold water temperature lower than a predetermined value, etc.). P10 may stop.

However, if a heat exchanger into which exhaust heat is introduced from the outside is provided in the exhaust heat utilization system pipe, even if the solution pump P10 is stopped, the heat is exchanged via the heat exchangers 30 and 34 to the outside. There is a case where exhaust heat is input from. In this case,
Since the solution does not circulate, the solution inside the heat exchangers 30 and 34 is concentrated and may be crystallized inside the heat exchangers 30 and 34. When crystallization occurs, the system with the heat exchangers 30 and 34 interposed becomes unusable. Therefore, it is desired to avoid the occurrence of crystallization, but no effective preventive measure has been proposed in the prior art.

There is also a case where the heating burner 100 is in an operation stop state, and in that case, the same problem occurs. That is, even if the heating burner is stopped, if exhaust heat is input from the outside through the heat exchanger, the solution inside the heat exchanger will be concentrated and crystallization may occur in the heat exchanger.

The present invention has been proposed in view of the above-mentioned problems of the prior art. It has a high-quality fuel system and an exhaust heat utilization system, and there are two exhaust heat utilization systems, and each system has a high temperature. A combined air-conditioning system in which an exhaust heat heat exchanger and a low-temperature exhaust heat heat exchanger are respectively interposed, which effectively prevents crystallization from occurring inside the high-temperature exhaust heat exchanger and the low-temperature exhaust heat heat exchanger. It is an object of the present invention to provide a combined cooling device and a control method thereof that can be prevented.

[0011]

SUMMARY OF THE INVENTION A method of controlling a combined air conditioner according to the present invention comprises a high temperature regenerator, a low temperature regenerator, a low temperature solution heat exchanger, a high temperature solution heat exchanger, and an absorbent communicating with the high temperature regenerator. And a high temperature exhaust heat heat exchanger and a low temperature exhaust heat heat exchanger, respectively, and the high temperature exhaust heat heat exchanger and the low temperature exhaust heat heat exchanger are absorption refrigeration. In the operation control method of the combined cooling device for exchanging heat between the high temperature fluid and low temperature fluid respectively supplied from the two temperature level exhaust heat sources other than the cooling machine and the dilute absorbent solution, it is detected that the solution pump operation stop signal is generated. And a step of determining whether or not a predetermined time has passed since the operation of the solution pump was stopped, and a step of bypassing the heat exchanger with a fluid containing exhaust heat after the predetermined time has elapsed. I'm out.

Further, the control method of the combined air-conditioning apparatus of the present invention is
A high temperature regenerator, a low temperature regenerator, a low temperature solution heat exchanger, a high temperature solution heat exchanger, and a dilute solution line of an absorbent that communicates the high temperature regenerator, and the high temperature waste heat heat exchanger to the dilute solution line. A low temperature exhaust heat heat exchanger is interposed respectively, and the high temperature exhaust heat heat exchanger and the low temperature exhaust heat heat exchanger absorb the high temperature fluid and the low temperature fluid respectively supplied from the two temperature level exhaust heat sources other than the absorption refrigerator. In the operation control method of the composite cooling device for exchanging heat with the diluted agent solution, a step of detecting that an operation stop signal of the heating means using high quality fuel is generated, and a predetermined time has elapsed from the operation stop of the heating means. A step of determining whether or not
And a step of bypassing the heat exchanger with a fluid containing waste heat after the predetermined time has elapsed.

Here, in the method for controlling the combined cooling apparatus, the temperature or pressure of the fluid containing the high temperature exhaust heat and the temperature of the fluid containing the low temperature exhaust heat are detected, and the temperature or pressure of the fluid containing the high temperature exhaust heat is determined. If the temperature is higher than the value, the fluid is supplied to the high temperature exhaust heat heat exchanger side, and if the temperature or pressure of the fluid containing the high temperature exhaust heat is lower than a predetermined value, the fluid is treated as the high temperature exhaust heat heat exchanger. When the temperature or pressure of the fluid containing the low temperature exhaust heat is higher than a predetermined value, the fluid is supplied to the low temperature exhaust heat heat exchanger side, and the temperature or pressure of the fluid containing the low temperature exhaust heat is If it is lower than a predetermined value, it is preferable to allow the fluid to bypass the low temperature exhaust heat exchanger.

Here, if the fluid containing the exhaust heat is hot water (liquid phase), the detected physical quantity is temperature. on the other hand,
If the fluid containing the exhaust heat is vapor (gas phase), there are cases where the detected physical quantity is temperature and cases where it is pressure.

Further, the combined cooling apparatus of the present invention comprises a high temperature regenerator, a low temperature regenerator, a low temperature solution heat exchanger, a high temperature solution heat exchanger and a dilute solution line of an absorbent which connects the high temperature regenerator. , A high temperature exhaust heat heat exchanger and a low temperature exhaust heat heat exchanger are respectively installed in the dilute solution lines, and the high temperature exhaust heat heat exchanger and the low temperature exhaust heat heat exchanger are exhausted at two temperature levels other than the absorption refrigerator. In a composite cooling device that exchanges heat between a high temperature fluid and a low temperature fluid respectively supplied from a heat source and a dilute absorbent solution, a branch means is provided in the piping system of the fluid containing the exhaust heat, and the solution pump is operated. Solution pump operation stop detection means for detecting that a stop signal has been generated, time measuring means for judging whether or not a predetermined time has passed since the solution pump operation was stopped, and output from the solution pump operation stop detection means and time measuring means Exhaust heat when signal is transmitted Control means for containing fluid to output a control signal to the branching means so as to bypass the heat exchanger includes a city.

Further, the combined air conditioner of the present invention comprises a high temperature regenerator, a low temperature regenerator, a low temperature solution heat exchanger, a high temperature solution heat exchanger and a dilute solution line of an absorbent communicating with the high temperature regenerator. A high temperature exhaust heat heat exchanger and a low temperature exhaust heat heat exchanger are respectively installed in the dilute solution lines, and the high temperature exhaust heat heat exchanger and the low temperature exhaust heat heat exchanger are two temperature level exhaust heat sources other than an absorption refrigerator. In the combined cooling device for exchanging heat between the high-temperature fluid and the low-temperature fluid respectively supplied from the cooling medium and the absorbent dilute solution, the pipe system for the fluid containing the exhaust heat is provided with the branching means, and the high-quality fuel is used. The heating means operation stop detection means for detecting that the operation stop signal for the heating means has been generated, the clock means for judging whether or not a predetermined time has elapsed from the operation stop of the heating means, the heating means operation stop detection means, and The output signal from the timekeeping means is transmitted Fluid containing waste heat control means for outputting a control signal to the branching means so as to bypass the heat exchanger includes a city and.

Here, in the combined air conditioner of the present invention,
A temperature or pressure detecting means for detecting the temperature or pressure of the fluid containing the high-temperature exhaust heat and the fluid containing the low-temperature exhaust heat, wherein the control means has a predetermined temperature or pressure of the fluid containing the high-temperature exhaust heat. If it is higher than a value, it is supplied to the high temperature exhaust heat heat exchanger side, and if it is lower than a predetermined value, while transmitting the control output to the branching means on the high temperature exhaust heat side so as to bypass the high temperature exhaust heat heat exchanger, If the temperature or pressure of the fluid containing the low temperature exhaust heat is higher than a predetermined value, it is supplied to the low temperature exhaust heat heat exchanger side, and if it is lower than the predetermined value, the low temperature exhaust heat heat exchanger is bypassed so that the low temperature exhaust heat is bypassed. The control output is preferably transmitted to the branch means on the heat side.

As the heating means using high quality fuel, it is preferable to use a gas burner or the like.

[0019]

According to the present invention having the above-mentioned structure,
When the solution pump operation stop detection means detects that the solution pump operation stop signal has been generated, the time measurement means determines whether or not a predetermined time has passed since the solution pump operation was stopped, and the predetermined time has passed. Then, the control means outputs a control signal to the branching means so that the fluid containing the exhaust heat bypasses the high temperature exhaust heat heat exchanger or the low temperature exhaust heat heat exchanger. If the fluid containing the exhaust heat is bypassed, the high temperature exhaust heat heat exchanger or the low temperature exhaust heat heat exchanger will not receive heat from the outside, and therefore, the high temperature exhaust heat heat exchanger or the low temperature exhaust heat heat exchanger will not be supplied. Even if the absorbing solution remains inside the heat exchanger, the remaining solution is prevented from concentrating or crystallizing.

Similarly, when the operation of the heating means such as the heating burner is stopped, the fact that the operation of the heating means is detected is detected by the heating means operation stop detecting means, and the fluid containing the exhaust heat is heated by the high temperature exhaust heat heat exchanger or the low temperature exhaust heat heat exchange. It is configured to bypass the vessel.
Thereby, even if the absorption solution remains inside the high temperature exhaust heat heat exchanger or the low temperature exhaust heat heat exchanger when the heating means is stopped, the remaining solution is prevented from concentrating or crystallizing. It

In the present invention, the temperature or pressure of the fluid containing the high temperature exhaust heat and the fluid containing the low temperature exhaust heat are detected by the temperature or pressure detecting means, and the temperature or pressure of the fluid containing the high temperature exhaust heat is predetermined. If it is higher than a value, the fluid is supplied to the high temperature exhaust heat heat exchanger side, and if it is lower than a predetermined value, it is configured to bypass, and the temperature or pressure of the fluid containing low temperature exhaust heat is higher than a predetermined value. If the fluid is supplied to the low temperature exhaust heat heat exchanger side if the temperature is higher, and if it is lower than the predetermined value, the fluid is supplied to the heat exchanger without supplying the fluid having a low temperature or pressure to the combined cooling. A situation in which the absorption solution circulating in the exhaust heat utilization system of the device is deprived of heat when passing through the high temperature exhaust heat heat exchanger or the low temperature exhaust heat heat exchanger is prevented. That is, the high temperature exhaust heat or the low temperature exhaust heat can be efficiently used.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

In these figures, the parts corresponding to those in FIG. 10 are designated by the same reference numerals, and the duplicated description will be omitted.

In FIG. 1, a hot water supply line L2 for supplying hot water from the hot water line 2 to the high temperature exhaust heat heat exchanger 30,
A hot water line L3 for supplying hot water from the hot water line 3 to the low temperature exhaust heat exchanger 34 is provided.

At the confluence of the hot water line 3 and the hot water supply line L3, a three-way valve V1 with adjustable flow rate is provided as a branching means, and the three-way valve V1 is provided with a control means 50 via a signal transmission line SL1. The valve opening control signal is transmitted from.

Similarly, the hot water line 2 and the hot water supply line L
A flow rate adjustable three-way valve V2 is provided as a branching unit at the confluence of two, and a valve opening control signal is transmitted from the control unit 50 to the three-way valve V2 via a signal transmission line SL2. It is configured.

The control means 50 includes the absorption chiller / heater 20.
The stop signal of the solution pump P10 (not shown in FIG. 1), the gas-fired operation switch OFF signal, the operation abnormality signal, and the operation stop signal of the gas burner 100 are respectively detected by the sensor 5
2, 54, 56 and 57 are input.

Next, the operation will be described with reference to FIGS. When the gas-fired operation switch of the absorption chiller-heater 20 is turned on or the reset switch is turned on (step S1), the operation is started, and the control means 50 sets the three-way valve V1 to the hot water supply line L3 side and the three-way valve. V2 is switched to the L2 side (step S2). Therefore, during operation, whether the solution pump P10 is stopped or the gas burner 100 is stopped by any of the sensors 52, 54, 56, 57,
It is determined whether or not there is an alarm that can be automatically reset (step S3).

If step S3 is NO, that is, if the operation is continued or the alarm is released, the process returns to step S2. If step S3 is YES, that is, the stop signal of the solution pump P10 is output, the stop signal of the gas burner 100 is output, or an alarm is issued, a predetermined signal is issued after such a signal is issued. It is determined whether the time T has elapsed (step S
4). Here, the predetermined time T means a time during which the solution remaining in the heat exchangers 30 and 34 does not condense to a certain concentration or more, which is the installation condition of the absorption chiller-heater 20 or It varies depending on various specifications.
It is a constant determined by the case.

If NO in step S4, the process returns to step S2, and if YES, the heat exchangers 30, 3
Since the solution remaining in 4 may be condensed, the three-way valve V1 is switched to the bypass side, the three-way valve V2 is also switched to the bypass side (step S5), and the process returns to step S3. As a result, the supply of hot water to the heat exchangers 30 and 34 is stopped, and thus the solution remaining in the heat exchangers 30 and 34 is prevented from being concentrated or crystallized.

In addition to the control flow during normal operation shown in FIG. 2, when operation is stopped, control as shown in FIG. 3 is performed. One of the sensors 52, 54, 56, 57 turns off the operation switch of the absorption chiller-heater 20, the operation of the gas burner 100 is stopped (OFF), or an abnormal situation occurs during operation. Then, when an abnormal signal is transmitted (step S6, step S6A, or step S7), the three-way valves V1 and V2 are switched to the bypass side (step S8). As a result, the hot water line 2,
The warm water flowing through 3 is not supplied to the heat exchangers 30, 34, and the solution remaining in the heat exchangers 30, 34 is prevented from condensing or crystallizing. After that, the operation of stopping the operation of the absorption chiller-heater 20 is performed, the operation is stopped (step S9), and the control ends.

FIG. 4 shows a second embodiment of the present invention. The hot water line 2, the hot water temperature T the temperature sensor 60 is a temperature measuring _{means H} for detecting a is provided, connected to the control device 50 by a signal transmission line SL3, the hot water line 3, like, the hot water temperature T _L Temperature sensor 61 for detection
Is provided, and the control means 50 is provided by the signal transmission line SL4.
The other parts are configured in the same manner as in FIG.

Next, the operation will be described with reference to FIG. When the gas-fired operation switch of the absorption chiller 20 is ON (step S10), and detects the temperature of hot water T _H, T _L by the temperature sensor 60 and 61 (step S11). Although not shown, when the fluid containing the exhaust heat is vapor, the pressure may be detected by the pressure sensor.
When the determination is made based on the pressure, the detected pressure is compared with the pressure of a predetermined value in the determinations in step S13 and thereafter.

After detecting the hot water temperature in step S11, it is determined to perform control such that the hot water temperature T _H is compared with a predetermined value and then the hot water temperature T _L is compared with a predetermined value (step S12). Then, it is determined whether or not the warm water temperature _TH is higher than a predetermined value (step S13).

If YES in step S13, that is, if the hot water temperature T _H is higher than the predetermined value, the three-way valve V2 is switched to the absorption chiller / heater 20 side (step S14), and step S14 is performed.
Returning to 12, if NO, that is, if the hot water temperature T _H is lower than the predetermined value, the three-way valve V2 is switched to the bypass side (step S15).

Once the determination has been made for temperature T _H ,
It is determined whether the warm water temperature T _L is higher than a predetermined value (step S16). Therefore, if YES, that is, if the hot water temperature _TL is higher than the predetermined value, the three-way valve V1 is absorbed and the chiller / heater 20
If it is NO, that is, if the hot water temperature T _L is lower than a predetermined value, the three-way valve V1 is switched to the bypass side (step S18), and the process proceeds to step S19. Although not shown, it is possible to perform control such that the hot water temperature T _L is compared with a predetermined value and then the hot water temperature T _H is compared with a predetermined value.

In step S19, during operation, the solution pump P10 is stopped by any of the sensors 52, 54, 56, 57, there is an alarm that can be automatically restored, or the heating burner 100 is stopped (OFF). If it is NO, that is, if the operation is continued or the alarm is released, the process returns to step S11. On the other hand, if step S19 is YES, that is, if the stop signal of the solution pump P10 is output, an alarm is issued, or the heating burner 100 is stopped, a predetermined time T has elapsed after such a signal was issued. Is determined (step S20). If NO, the process returns to step S11 and Y
If it is ES, the three-way valves V1 and V2 are 100 to the bypass side.
% Open and stop supplying hot water to the heat exchangers 30, 34. Therefore, the solution remaining in the heat exchangers 30 and 34 is prevented from condensing and crystallizing.

FIG. 6 shows a third embodiment of the present invention, in which a high temperature steam exhaust heat exchanger 30 is provided in a high pressure steam line 2A having a two-way valve V2A and a low pressure steam line having a two-way valve V1A. Three
This is an example in which the low temperature exhaust heat exchanger 34 is interposed in A and the other configurations are the same as those in FIG. This embodiment has substantially the same effects as the embodiment of FIG.

FIG. 7 shows a fourth embodiment of the present invention, in which a high pressure steam line 2A is provided with a pressure sensor 62 for detecting the pressure PH, a low pressure steam line 3A is provided with a pressure sensor 63 for detecting the pressure PL, and others are provided. This is an example configured similarly to FIG. This embodiment has substantially the same effects as the embodiment of FIG.

FIG. 8 shows a fifth embodiment of the present invention, in which a high temperature exhaust heat heat exchanger 30 is installed in a steam line 2B equipped with a two-way valve V2B.
Is provided, a three-way valve V1B is provided in the hot water line 3B, and the others are configured similarly to FIG. This embodiment has substantially the same effects as the embodiment of FIG.

FIG. 9 shows a sixth embodiment of the present invention. A pressure sensor 64 for detecting the pressure P is provided in the steam line 2B, a temperature sensor 65 for detecting the temperature T is provided in the hot water line 3B, and the others are shown in FIG. This is an example configured in the same manner as. This embodiment has substantially the same effects as the embodiment of FIG.

It should be noted that the illustrated embodiment is merely an example and is not intended to limit the technical scope of the present invention. For example, the technical scope of the present invention includes a technique of measuring and controlling the pressure of steam containing exhaust heat instead of controlling by the temperature of hot water containing exhaust heat.

[0043]

As described above, according to the present invention, unnecessary supply of exhaust heat to the absorption chiller / heater is avoided, and crystals are formed inside the high temperature exhaust heat exchanger and the low temperature exhaust heat exchanger. The precipitation can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a control flowchart of FIG.

FIG. 3 is another control flowchart of FIG.

FIG. 4 is a control flowchart showing a second embodiment of the present invention.

FIG. 5 is a flowchart of FIG.

FIG. 6 is a block diagram showing a third embodiment of the present invention.

FIG. 7 is a block diagram showing a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing a fifth embodiment of the present invention.

FIG. 9 is a block diagram showing a sixth embodiment of the present invention.

FIG. 10 is an overall configuration diagram showing an example of a conventional absorption chiller-heater.

[Explanation of symbols]

 CL ... Cooling water line L1 ... Dilute solution line L2, L3 ... Hot water supply line P9 ... Refrigerant pump P10 ... Solution pump V1, V1B, V2 ... Three-way valve V1A, V2A, V2B ... Two-way valves SL1 to SL4 ... Signal transmission lines 2, 3, 3B ... Hot water line 2A ... High pressure steam line 2B ... Steam line 3A ... Low pressure steam line 6 ... Cold water Line 9 ... Evaporator 10 ... Absorber 11 ... High temperature regenerator 12 ... Low temperature regenerator 13 ... Condenser 14 ... High temperature solution heat exchanger 15 ... Low temperature solution heat exchange Container 20 ... Absorption chiller / heater 21 ... Fuel line 30 ... High temperature exhaust heat heat exchanger 34 ... Low temperature exhaust heat heat exchanger 52, 54, 56, 57 ... Sensor 60, 61, 65 ... Temperature sensor 62, 63, 64 ... The force sensor 100 ... heating burner

Claims (6)

[Claims] 1. A high-temperature regenerator, a low-temperature regenerator, a low-temperature solution heat exchanger, a high-temperature solution heat exchanger, and a dilute solution line of an absorbent that communicates with the high-temperature regenerator, and the high-temperature exhaust gas is introduced into the dilute solution line. The heat heat exchanger and the low temperature exhaust heat heat exchanger are respectively installed,
The high-temperature exhaust heat heat exchanger and the low-temperature exhaust heat heat exchanger operate a combined cooling device for exchanging heat between a high-temperature fluid and a low-temperature fluid supplied from a two-temperature level exhaust heat source other than an absorption refrigerator and an absorbent dilute solution. In the control method, a step of detecting that a solution pump operation stop signal has occurred, and a step of determining whether or not a predetermined time has elapsed from the solution pump operation stop,
And a step of bypassing the heat exchanger with a fluid containing exhaust heat after the lapse of the predetermined time. 2. A high-temperature regenerator, a low-temperature regenerator, a low-temperature solution heat exchanger, a high-temperature solution heat exchanger, and a dilute solution line of an absorbent which communicates with the high-temperature regenerator, and the high-temperature exhaust gas is introduced into the dilute solution line. The heat heat exchanger and the low temperature exhaust heat heat exchanger are respectively installed,
The high-temperature exhaust heat heat exchanger and the low-temperature exhaust heat heat exchanger operate a combined cooling device for exchanging heat between a high-temperature fluid and a low-temperature fluid supplied from a two-temperature level exhaust heat source other than an absorption refrigerator and an absorbent dilute solution. In the control method, a step of detecting that an operation stop signal of the heating means using high quality fuel is generated, a step of determining whether or not a predetermined time has elapsed from the stop of operation of the heating means, and the predetermined time And a step of bypassing the heat exchanger with a fluid containing exhaust heat after the passage of. 3. A temperature or pressure of a fluid containing high temperature exhaust heat and a fluid containing low temperature exhaust heat are detected, and if the temperature or pressure of the fluid containing high temperature exhaust heat is higher than a predetermined value, the fluid is When the temperature or pressure of the fluid containing the high temperature exhaust heat is lower than a predetermined value, the fluid is supplied to the high temperature exhaust heat heat exchanger side to bypass the high temperature exhaust heat heat exchanger and the low temperature exhaust heat is removed. If the temperature or pressure of the contained fluid is higher than a predetermined value, the fluid is supplied to the low temperature exhaust heat heat exchanger side, and if the temperature or pressure of the fluid containing the low temperature exhaust heat is lower than the predetermined value, the fluid is The method for controlling a combined air conditioner according to any one of claims 1 and 2, wherein the low temperature exhaust heat heat exchanger is bypassed. 4. A high-temperature regenerator, a low-temperature regenerator, a low-temperature solution heat exchanger, a high-temperature solution heat exchanger, and a dilute solution line of an absorbent that communicates with the high-temperature regenerator, and the high-temperature exhaust gas is discharged to the dilute solution line. The heat heat exchanger and the low temperature exhaust heat heat exchanger are respectively installed,
The high temperature exhaust heat heat exchanger and the low temperature exhaust heat heat exchanger are heat exchangers for exchanging heat between a high temperature fluid and a low temperature fluid respectively supplied from two temperature level exhaust heat sources other than an absorption refrigerator and an absorbent dilute solution, A branching means is provided in the piping system of the fluid containing the exhaust heat, a solution pump operation stop detecting means for detecting that a solution pump operation stop signal is generated, and a predetermined time from the solution pump operation stop. When the output signals from the solution pump operation stop detection means and the time measuring means are transmitted to the time measuring means that determines whether or not the time has passed, the branching means is provided so that the fluid containing the exhaust heat bypasses the heat exchanger. And a control means for outputting a control signal to the combined cooling device. 5. A high-temperature regenerator, a low-temperature regenerator, a low-temperature solution heat exchanger, a high-temperature solution heat exchanger, and a dilute solution line of an absorbent that communicates with the high-temperature regenerator are provided, and the high-temperature exhaust gas is discharged to the dilute solution line. The heat heat exchanger and the low temperature exhaust heat heat exchanger are respectively installed,
The high temperature exhaust heat heat exchanger and the low temperature exhaust heat heat exchanger are heat exchangers for exchanging heat between a high temperature fluid and a low temperature fluid respectively supplied from two temperature level exhaust heat sources other than an absorption refrigerator and an absorbent dilute solution, A branching means is interposed in the piping system of the fluid containing the exhaust heat, and a heating means operation stop detecting means for detecting that an operation stop signal of the heating means using high quality fuel is generated, and the heating means. When the output signals from the timing means for determining whether or not a predetermined time has elapsed after the operation stop of the heating means, the heating means, the operation stop detection means and the timing means are transmitted, the fluid containing the exhaust heat bypasses the heat exchanger. And a control means for outputting a control signal to the branching means. 6. A temperature or pressure detecting means for detecting the temperature or pressure of the fluid containing the high temperature exhaust heat and the fluid containing the low temperature exhaust heat, wherein said control means detects the temperature or pressure of the fluid containing the high temperature exhaust heat. If the temperature or pressure is higher than a predetermined value, it is supplied to the high temperature exhaust heat heat exchanger side, and if the temperature or pressure is lower than the predetermined value, control output to the branching means on the high temperature exhaust heat side so as to bypass the high temperature exhaust heat heat exchanger. When the temperature or pressure of the fluid containing the low temperature exhaust heat is higher than a predetermined value, it is supplied to the low temperature exhaust heat heat exchanger side, and if it is lower than the predetermined value, the low temperature exhaust heat heat exchanger is bypassed. 6. The combined air-conditioning system according to claim 4, wherein the control output is transmitted to the branching means on the low temperature exhaust heat side so as to prevent it.