JPH04131662A - Stopping method for operation of absorption refrigerator-cold/hot water device and stop controller - Google Patents

Abstract

PURPOSE:To provide an inexpensive facility without necessity of an additional component such as a shut-off valve even if a plurality of absorption refrigerators.cold/hot water devices are employed and only one coolant pump is provided by stopping a coolant pump, a chilled water pump and a refrigerant pump, then maintaining the operation of the absorption liquid pump, diluting the liquid and stopping the operation. CONSTITUTION:If a coolant flow confirmation switch 18 for always monitoring the flow of coolant 22 outputs an OFF signal when an operation stop command signal is input by the operation of an operation stop command switch 16, the stop commands of a chilled water pump 13 and a refrigerant pump 14 are output. On the other hand, if an ON signal is output from the switch 18 when the operation stop command signal is input by the operation of the switch 16, a command for operating the pumps 13, 14 continuously, for example, for 5min, and then stopping the pump 14, is output.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and a stop control device for stopping the operation of absorption refrigerators and cold/hot water machines. The present invention relates to an operation shutdown method and a shutdown control device that allow the operation of the absorption liquid pump to be maintained and the absorption liquid to be diluted after stopping the cooling water pump, chilled water pump, or refrigerant pump.

[Conventional technology]

Absorption refrigerators and absorption chiller/heater machines are designed to extract cold water by changing the concentration of the absorption liquid that circulates within the network. For example, in a dual-effect type absorption chiller/heater, as shown in Figure 3, an evaporator 1. Absorber 2. Low temperature regenerator 3. There is a condenser 4, and a high temperature regenerator 5 is installed outside the condenser.
is provided.

An evaporator tube IA is arranged inside the evaporator 1, and the refrigerant liquid pumped up by the refrigerant pump 14 from the refrigerant reservoir IB is made to flow down to the outer surface of the evaporator tube IA under high vacuum. . The latent heat of vaporization is taken away by the refrigerant liquid, and the cold water 21 flowing in the evaporator tube IA is cooled. The cold water 21a
is sent to a predetermined heat exchanger installed in a room that requires cooling, and the cold water 21b that has received heat and raised its temperature is sent to a cold water pump 13.
to the evaporator tube IA.

On the other hand, an absorber tube 2A is arranged inside the absorber 2, and by cooling the refrigerant vapor generated in the evaporator 1 with the cooling water 22 in the absorber tube 2A, the sprayed absorption liquid 23 is absorbed. At the same time, the inside of the net is maintained at a high vacuum. In addition,
An absorption liquid pump I5 is provided to send the dilute absorption liquid in the absorber 2 to the low temperature regenerator 3. The condenser 4 has a condenser tube 4
A is arranged so that the refrigerant vapor evaporated in the regenerator 3.5 is cooled and condensed by the cooling water 22 in the condenser pipe 4A. The low temperature regenerator 3 is the gas-liquid separator 20 of the high temperature regenerator 5.
The absorbing liquid 23a is heated and concentrated using the latent heat of the refrigerant vapor 20a separated and evaporated, and the refrigerant is separated and evaporated. In the high temperature regenerator 5, the absorption liquid 23b is heated in vacuum by the heating device 9, and a part of the refrigerant is evaporated and separated.

The above absorber pipe 2A and condenser pipe 4A are generally in communication, and after the cooling water 22 passes through the absorber 2, the condenser pipe 4A is connected to the condenser pipe 4A.
supplied to The temperature of the cooling water is lowered in a cooling tower or the like, and then returned to the absorber pipe 2A via the cooling water pump 12.

In absorption refrigerators and cold/hot water machines that operate in this manner, the opening degree of the heating amount adjustment valve 10 of the high-temperature regenerator 5 is adjusted by a signal from a temperature sensor 8 provided at the cold water outlet. There is. If the chilled water outlet temperature is not low enough to obtain the temperature set for cooling, the opening degree of the heating amount adjustment valve 10 is increased to promote heating, and the absorption chiller/chilling/heating machine is activated. Operated at or near full load. Note that an absorption chiller/heater mainly has only a cooling function, but in the case of an absorption chiller/heater, it can perform not only cooling operation but also heating operation. If either machine is a double-effect absorber, the absorption liquid is heated by burning gas or oil or by introducing high-temperature steam in the high-temperature regenerator 5; In the illustrated example, high-temperature steam is introduced into the low-temperature regenerator 3).

By the way, when stopping the cooling operation of the absorption chiller/cooling/heating machine, the cooling water pump 12, cold water pump 13, and refrigerant pump 14 are stopped at the same time, and the operation of the absorption liquid pump 15 is maintained to dilute the absorption liquid 23. method may be adopted. This is because if a concentration difference remains in the absorption liquid 23 after stopping the supply of oil etc. to the heating device 9 with the fuel cutoff valve 11 and stopping the operation of the absorption chiller/cooler/heater, the absorption This is because lithium bromide, which acts as an absorber, precipitates in areas where the concentration of the liquid is high, preventing restart of operation or requiring time to start up.

[Problem to be solved by the invention]

In order to increase the cooling capacity of absorption refrigerating machines and water chillers and hot water machines that employ such a stop method, a plurality of such machines may be installed at different locations. In this case, installing a cooling water pump for each unit increases equipment costs, so to avoid this, only one cooling water pump is installed and cooling water from that pump is supplied to all units. When it is desired to reduce the cooling capacity of equipment configured in this way, in order to avoid inefficient partial load operation, one or two units should be stopped and the remaining absorption chillers/chilled/heated water units should be operated at their rated capacity. In some cases, the number of units is controlled.

Since the cooling water pump remains in operation for absorption chillers and chiller/hot water machines that continue to operate, cooling water also flows to the absorbers and condensers of the absorption chillers and chiller/hot water machines that are in a stopped state. In this state, the absorption liquid pump continues to operate, but if the chilled water pump or refrigerant pump is stopped when the absorption chiller or chiller/heater is stopped while operating near the cooling rated load, Refrigerant freezes. In other words, the absorption liquid moving through the brain by the absorption liquid pump is cooled by the cooling water flowing by the cooling water pump, the pressure in the absorber and evaporator decreases, and the refrigerant in the refrigerant reservoir of the evaporator freezes. This may lead to insufficient dilution of the absorption liquid.

Therefore, consideration must be given to installing a shutoff valve in the cooling water piping of each absorption chiller/chilling/heating water machine so that cooling water does not flow into the absorption chiller/chilling/heating machine during dilution operation after the operation has been stopped. Become. In this case, even if only one cooling water pump is used, the number of cutoff valves required is equal to the number of absorption chillers and water chillers, which also increases costs.

Although this is different from the above case, even if there is only one absorption chiller/cooler/heater installed, there are times when it is desirable to leave the cooling water pump running after stopping its operation. For example, the operation is stopped when the cooling load becomes extremely small, but if cold water that is already at a predetermined temperature, for example, 6° C., is sent out, weak cooling can be performed with the remaining capacity.

At that time, if you stop the cold water pump or refrigerant pump,
Situations such as the above-mentioned freezing may occur.

Therefore, when stopping the oil supply to the absorption chiller/chiller/heater and stopping the operation, it is desirable to stop the cooling water pump and enter the absorption liquid dilution operation, and not to enter the dilution operation immediately. Even if an absorption chiller or chiller/heater receives a command to stop operation, it is possible to select the subsequent operating state depending on whether the flow of cooling water is to be stopped or maintained. It is desirable to keep it that way.

The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent interruptions even when only one cooling water pump is installed, even though multiple absorption chillers and chiller-heating machines are used. It does not require additional components such as valves, making it an inexpensive facility, and even if cooling water is poured into an absorption chiller or chiller/heater that is not operating, the absorption chiller or chiller/heater will not absorb the water. It must be possible to prevent the liquid from freezing, and the cooling water piping for the absorption chiller/chiller/hot water machine, regardless of whether multiple or only one absorption chiller/chiller/heater is used. Operation of absorption chillers and hot/cold water machines that automatically selects a shutdown mode depending on whether or not cooling water is flowing to the machine, thereby avoiding the occurrence of adverse effects due to shutdowns. An object of the present invention is to provide a stopping method and a stopping control device.

[Problem to be solved by the invention]

The present invention provides a cooling water pump that distributes cooling water to an absorber pipe or a condenser pipe, a cold water pump that distributes cold water to an evaporator pipe, and a cooling water pump that distributes cold water to an evaporator pipe when stopping the cooling operation of an absorption chiller or a water chiller/heater. This method is applied to an operation shutdown method in which, after stopping the refrigerant pump for distributing refrigerant, the operation of the absorption liquid pump that sends out the absorption liquid from the absorber is maintained to dilute the absorption liquid.

The feature is that, with reference to FIG. 1, when the cooling water pump 12 stops, the cooling water pump 13 stops almost at the same time.
．． The refrigerant pump 14 is stopped, and the absorption liquid pump 15 is stopped after a predetermined period of time has elapsed. If the cooling water pump 12 does not stop, the refrigerant pump 14 is stopped after operating the chilled water pump 13 and the refrigerant pump 14 for several minutes. , the operation of the cold water pump 13 is maintained until the cooling water pump 12 is stopped thereafter, and if a predetermined time has elapsed when the cold water pump 13 is stopped after the cooling water pump 12 is stopped, the absorption liquid pump 15 is also stopped. This is what I tried to do.

In the invention of the device, in order to stop the operation of the absorption refrigerating machine/chilling/heating machine, an operation stop command switch 16 that instructs to stop the supply of the heating source to the heating device 9, and a cooling water pipe 17 are provided.
A cooling water flow confirmation switch 18 attached to the cooling water flow confirmation switch 18 is provided. Then, based on the signals from the operation stop command switch 16 and the cooling water flow confirmation switch 1, when there is no flow of the cooling water 22, a stop command for the cold water pump 13 and the refrigerant pump 14 is immediately output. 22, an operation command control means 19 is employed which outputs a command to stop the refrigerant pump 14 after continuing to operate the cold water pump 13 and the refrigerant pump 14 for several minutes.

[For production]

A signal to stop the absorption refrigerating machine/cold/hot water machine in operation is sent from the operation stop command switch 16 to the operation command control means 19.
When input to , the supply of the heat source to the heating device 9 is cut off. At this time, if there is a signal from the cooling water flow confirmation switch 18 that the flow of the cooling water 22 in the cooling water pipe 17 is stopped, that is, if the operation of the cooling water pump 12 is stopped, the operation command control means 19 outputs a signal to stop the cold water pump 13 and refrigerant pump 14 almost simultaneously with the stop of the cooling water pump 12.

The absorption liquid pump 15 is operated until a predetermined period of time has elapsed after a stop signal is outputted by the operation stop command switch 16, and the absorption liquid 23 in the absorption refrigerator/cooler/hot water machine whose operation has been stopped is operated to dilute it. After a predetermined period of time, the absorption liquid pump 1
5 was also stopped, and its absorption refrigerator and cold/hot water machine were completely stopped.

On the other hand, when a stop signal is input from the operation stop command switch 16 to the operation command control means 19, it becomes clear from the signal from the cooling water flow confirmation switch 18 that the cooling water 22 in the cooling water pipe 17 is still flowing. In other words, if the operation of the cooling water pump 12 is not stopped,
The operation command control means 19 continues to operate the cold water pump 13 and the refrigerant pump 14 for several minutes. During this time, the absorption liquid pump 15 is also operating, and the absorption liquid 23 is brought into a state where it can be diluted. In this case, the cooling water 22 flows through the cooling water pipe 17 to cool the absorption liquid 23, and the refrigerant liquid is successively dispersed into the evaporator pipe IA. If the refrigerant pump 14 is stopped, the refrigerant remaining in the evaporator pipe IA or the refrigerant in the refrigerant reservoir IB may boil, boiling droplets may adhere to the evaporator pipe IA, or the absorption liquid 23 may freeze. things will happen, but they will be avoided.

When the time necessary for the absorption liquid 23 to be diluted to a certain extent in this manner has elapsed, a signal to stop the refrigerant pump 14 is output. Thereafter, until the cooling water pump 12 stops, that is, a signal indicating that the cooling water 22 is no longer circulating is detected from the cooling water flow confirmation switch 18, the cooling water pump 12 stops.
3 operation is maintained. When the cold water pump 13 is stopped, if a predetermined period of time has elapsed since the signal from the operation stop command switch 16 was received, the absorption liquid pump 15 is also stopped. If the predetermined time has not elapsed, the absorption liquid pump 15 is stopped after the elapse of the predetermined time, and the absorption refrigerator/cooler/heater is completely stopped.

〔Effect of the invention〕

According to the present invention, different operation shutdown controls are performed depending on whether or not cooling water is flowing. Therefore, if the cooling water is stopped, the chilled water pump and refrigerant pump can also be stopped immediately, so the absorption chiller/chiller/heater that is stopped by the operation stop command switch only needs power for the specified dilution operation. Therefore, excessive energy consumption can be prevented.

On the other hand, if a command to stop operation is received but cooling water is still flowing, the chilled water pump and refrigerant pump will continue to operate for a while, so freezing of the absorption liquid will occur if the chilled water pump or refrigerant pump is stopped at the time of shutdown. The occurrence of such troubles can be avoided.

In either mode of operation stoppage, the absorption liquid in the absorption refrigerating machine/chilling/heating machine can be diluted, and the start-up time for restarting can be shortened.

[Example] The present invention will be explained in detail below based on examples.

FIG. 1 is a configuration diagram of an example of a dual-effect absorption chiller/heater. In addition to absorption chiller-heating machines with cooling and heating functions, absorption chillers and the like with cooling functions draw cold water 21a from the evaporator pipe IA disposed in the evaporator 1 due to changes in the concentration of the circulating absorption liquid. It can be taken out. For this purpose, the carcass meat is placed in a vacuum state using an evaporator 1. An absorber 2, a low-temperature regenerator 3, and a condenser 4 are provided, and a high-temperature regenerator 5 connected to the absorber 2 and the low-temperature regenerator 3 is installed outside the body.
Furthermore, a low-temperature heat exchanger 6 and a high-temperature heat exchanger 7 are provided for heat exchange of the absorption liquid.

Note that in the following explanation, the cooling operation in the absorption chiller/heater will be discussed, and the explanation of the cooling operation in the absorption refrigerator, which functions similarly, will be omitted.

Cold water 21 is placed in the evaporator tube IA arranged inside the evaporator 1.
A temperature sensor 8 for detecting the cold water outlet temperature is connected to the pipe for taking out the cold water.

A heating device 9 that burns gas or oil is installed in the high-temperature regenerator 5, and is equipped with a heating amount adjustment valve 10 that adjusts the amount of heating heat in the high-temperature regenerator 5 based on a signal from the temperature sensor 8. has been done. As a result, when the outlet temperature of the cold water 21 due to absorption refrigeration differs from the control setting value, the supply heat source amount is adjusted by the valve opening degree of the heating amount adjustment valve 10 so that the control setting value is obtained as the outlet temperature. Ru. Note that a fuel cutoff valve 11 that supplies a heat source such as oil is provided upstream of this heating amount adjustment valve 10.

In such an absorption chiller/heater, when the cooling operation is stopped, a cooling water pump 12. After stopping the cold water pump 13 for circulating cold water 21 through the evaporator pipe IA and the refrigerant pump 14 for distributing refrigerant in the evaporator l, the absorption liquid 23
The operation of the absorption liquid pump 15, which sends out the absorption liquid from the absorber 2, is maintained so that the absorption liquid 23 can be diluted.

Although most of the drawings show one absorption chiller/heater, the following explanation will be based on an example in which a plurality of absorption chiller/heaters are installed in one place.

Each absorption chiller/heater is provided with an operation stop command switch 16A, 16B, etc., which instructs the high temperature regenerator 5 to stop supplying oil in order to stop its cooling operation. . This operation stop command switch 16 may be a remote stop type or a hand stop type, or when controlling the number of operating units using a control device (not shown), it may be a switch operated by a command from the control system. do. When the operation stop command switch 16 is turned off, it outputs a signal to that effect to the operation command control means 9, which will be described later, and immediately issues a command to fully close the fuel cutoff valve 11 described above.

Cooling water pipe 1 connected to absorber pipe 2A of absorber 2
7 is attached with a cooling water flow confirmation switch 18 that detects whether or not the cooling water 22 is flowing therethrough.

A flow rate switch, a differential pressure switch, or the like is used for this, and if the cooling water 22 does not flow, an OFF signal is output to the operation command control means 19.

The absorption chiller/heater is provided with a control device for controlling its operation, and based on the signals from the above-mentioned operation stop command switch 16 and cooling water flow confirmation switch 18,
An operation command control means 19 for commanding the start and stop of the cold water pump 13 and the refrigerant bomb 4 is incorporated in a microcomputer in the operation control unit (not shown). When an operation stop command signal is input by operating the operation stop command switch 16, if an off signal is output from the cooling water flow confirmation switch 18, which constantly monitors the flow of the cooling water 22, the cold water pump 13 and the refrigerant A command to stop the pump 14 is output. On the other hand, when the operation stop command signal is input by the operation of the operation stop command switch 16, if the ON signal is output from the cooling water flow confirmation switch 18, the chilled water pump 13 and the refrigerant pump 14 continue to operate for 5 minutes, for example. After that, a command to stop the refrigerant pump 14 is output.

In an absorption chiller/heater that adopts such a control form, the following operation and stopping operations can be performed.

When the absorption chiller/heater is in operation, for example, oil is supplied to the heating device 9 in the high-temperature regenerator 5, and its combustion heats the absorption liquid 23b in a vacuum and evaporates and separates a part of the refrigerant. The absorption liquid 23 is drawn out from the absorber 2 by the absorption liquid pump 15, and is heated in the low-temperature heat exchanger 6 and then supplied to the low-temperature regenerator 3. Refrigerant vapor 20 separated and evaporated in liquid separator 20
A liquid after separating and evaporating the refrigerant using the latent heat of a,
Thereafter, it was further heated in a high-temperature heat exchanger 7 and introduced into a high-temperature regenerator 5.

In the condenser 4, the refrigerant vapor that evaporated in the low-temperature regenerator 3 and the refrigerant vapor that could not become refrigerant liquid while passing through the regenerator pipe 3A are condensed. The absorber pipe 2A is attached to the condenser pipe 4A.
The cooling water 22 that has passed through is flowing, thereby producing a refrigerant liquid.

The refrigerant liquid is led to the evaporator 1, pumped up and distributed by the refrigerant pump 14, and the latent heat of evaporation is taken away by the refrigerant liquid flowing down to the outer surface of the evaporator pipe IA under high vacuum.
The cold water 21 flowing inside is cooled. In the absorber 2, the refrigerant vapor generated in the evaporator 1 is cooled by the cooling water 22 flowing in the absorber tube 2A, and when absorbed by the sprayed absorption liquid 23, the body meat is maintained in a high vacuum state. .

During such operation, the cooling water 22 is cooled in the cooling tower and pumped by the cooling water pump 12 into the absorber 2. It flows through the condenser 4. After the cold water 21 is led out from the evaporator 1 to the heat exchanger of the room requiring cooling, it is returned to the evaporator pipe IA by the cold water pump 13 in a slightly raised state.

When such a cooling effect is stably performed in all the absorption chiller/heater units (step 1 in the flowchart of FIG. 2, hereinafter referred to as 31, etc.), the operation stop command switch 16 of any one of the units is activated. When turned off by an operator's operation or a command from the automatic control system (S2), the fuel cutoff valve 11 is closed to stop the supply of oil to the heating device 9 in the high-temperature regenerator 5 ( S3). The signal that the operation stop command switch 16 is turned off is the operation command control means 1
9, at that point the operation command control means 19
The state of the cooling water flow confirmation switch 18 is confirmed based on the input signal from the switch.

For example, if it is determined that the cooling water pump 12 is stopped and the cooling water 22 is not flowing through the cooling water piping 17 because the operation of all absorption chiller/heating machines is stopped, etc., (34)
, and almost simultaneously, the cold water pump 13 and the refrigerant pump 1
Outputs a command to stop the operation of 4. The time elapsed from the time when the cold water pump 13 and the refrigerant pump 14 were stopped (35) and a signal indicating that the operation stop command switch 16 was turned off was input to the operation command control means 19 is counted. For example, 15 minutes is counted. The operation of the absorption liquid pump 15 is maintained until the time elapses (S6). The absorption liquid 23 with a difference in concentration is circulated through the trunk meat by the absorption liquid pump 15 to dilute it. Therefore, even if a concentration difference remains in the absorption liquid 23 while the combustion in the heating device 9 is stopped,
The dilution effect prevents the absorbent from crystallizing.

After 15 minutes have elapsed, it is assumed that the dilution has been completed, and the absorption liquid pump 15 is stopped, and the operation of the absorption chiller/heater is completely stopped (S7). According to such a stop mode, in the absorption chiller/hot water machine whose operation is stopped, power is only consumed for dilution operation, and energy saving is achieved.

On the other hand, even though only one cooling water pump 12 is installed, if it is responsible for circulating all the cooling water of multiple absorption chiller/heaters, only one of the absorption chiller/heaters This section describes when you want to operate only one or two units and reduce the cooling capacity. By operating in this manner, inefficient partial load operation can be avoided, and the operated absorption chiller/heater will be in a state close to the rated load, improving efficiency. For this reason, when the operation of some absorption chiller/hot water machines is stopped, the operation stop command switch 16 for each absorption chiller/heater is turned off (S2). The fuel cutoff valve 11 of the stopped absorption chiller/heater is fully opened (S3
), its combustion is stopped, and there is no effect of creating a concentration difference in the absorption liquid (However, the cooling water 22 from the cooling water pump 12 is also supplied to the stopped absorption chiller/heater, and its absorber pipe 2A The state in which the cooling water 22 is flowing through the condenser pipe 4A is maintained.

Therefore, the operation command control means 19 is operated by the operation stop command switch 1.
6 is turned off, it is confirmed what state the cooling water flow confirmation switch 18 is at that time. Because it is detected that the cooling water 22 is flowing (S4
), the operation command control means 19 maintains the operation of the cold water pump 13 and the refrigerant pump 14 for the next five minutes. During this time, the absorption liquid pump 15 is still operating, but together with the operation of the refrigerant pump 14, the absorption liquid is brought into a state where it can be diluted. When 5 minutes have passed (S8), there is no possibility of the absorption liquid freezing, so at that point, refrigerant pump 1
4 is stopped (S9).

Thereafter, the operation of the cold water pump 13 is maintained until the circulation of cooling water in the cooling water pipe 17 is stopped, for example, when all of the absorption chiller/heaters are stopped. This cools the absorption liquid 23 while the cooling water 22 is flowing, but the refrigerant liquid is also successively sprayed into the evaporator tube IA. If the refrigerant pump 14 is stopped, the refrigerant remaining in the evaporator pipe IA or the refrigerant in the refrigerant reservoir IB may boil for some reason, and its droplets may adhere to the evaporator pipe IA. There remains a possibility that the absorption liquid 23 may freeze. However, since the cold water 21 is distributed, such a situation can be avoided.

When an off signal is input from the cooling water flow confirmation switch 16 (310), the cold water pump 13 is stopped (31
1) At that point, if 15 minutes have not elapsed since the signal indicating that the operation stop command switch 19 was turned off was input to the operation command control means 19 (36), the operation of the absorption liquid pump 15 is maintained. be done. The absorption liquid 23 with a difference in concentration is circulated through the trunk meat by the absorption liquid pump 15 and diluted. Therefore, even if a concentration difference remains in the absorption liquid 23 while combustion in the heating device 9 is stopped, crystallization of the absorption agent due to the dilution effect can be avoided.

If 15 minutes have already passed or after that (
S6), the absorption liquid pump 15 is also stopped, and the operation of the absorption chiller/heater is completely stopped (S7).

With this kind of stop control, even if there are multiple absorption chiller/heaters installed and only one cooling water pump is installed considering the equipment cost, cooling can be done to the absorption chiller/heater that is stopped. Problems caused by flowing water can be resolved. That is, freezing of the refrigerant, which would occur if the cold water pump or refrigerant pump is stopped when the absorption chiller/heater is operating near the cooling rated load, is avoided, and the absorption liquid is sufficiently diluted. Therefore, there is no need to provide a cutoff valve in the cooling water piping of each absorption chiller/heater, and an inexpensive and easily controllable absorption chiller/heater with a single cooling water pump can be achieved.

The above explanation is an example where multiple absorption chiller/heaters are installed, but even if only one absorption chiller/heater is installed, the cooling water pump may be left running after its operation is stopped. In the section on the prior art, there are some things that you may want to keep in mind. In such a case, when stopping the operation of the absorption chiller/heater, if the delivery of cold water is to be stopped immediately or a mode in which the delivery of cold water is not stopped immediately is selected, control according to the above explanation can be adopted. Therefore, the control of the present invention can be applied when shutting down the operation, regardless of the number of absorption chiller/heater units installed.

Note that although the above example is for burning oil, the same applies to burning city gas or natural gas, and there is no problem in the case of a device that introduces steam as the heating device 9 of the high-temperature regenerator 5. Furthermore, in the case of a single-effect absorber without a high-temperature regenerator, steam is introduced into the regenerator pipe in the regenerator, but if the steam supply valve is regarded as a fuel cutoff valve, similar control is possible. Become.

[Brief explanation of drawings]

FIG. 1 is a control system diagram in which the present invention is applied to an absorption chiller/heater, FIG. 2 is a flowchart for explaining the control, and FIG. 3 is a configuration diagram of an example of the absorption chiller/heater. 1--Evaporator, IA--Evaporator tube, 2--Absorber, 2
A...-Absorber pipe, 4A--Condenser pipe, 9... Heating device, 11--Fuel cutoff valve, 12... Cooling water pump,
13 Chilled water pump, 14... Refrigerant pump, 15...-Absorption liquid pump, 16.16A to 16C...-Operation stop command switch, 17-... Cooling water piping, 18... Cooling water flow confirmation switch, 19...operation command control means, 21.
21a--Cold water, 22--Cooling water, 23--Absorption liquid.

Claims (2)

[Claims] (1) When stopping the cooling operation of an absorption chiller or water chiller/heater, the cooling water pump that distributes cooling water to the absorber pipe and condenser pipe, the cold water pump that distributes cold water to the evaporator pipe, and the inside of the evaporator. In the operation stop method, the operation of the absorption liquid pump that sends out the absorption liquid from the absorber is maintained to dilute the absorption liquid after stopping the refrigerant pump for distributing the refrigerant, wherein the cooling water pump is When the cooling water pump has stopped, the chilled water pump and the refrigerant pump are stopped at almost the same time, and the absorption liquid pump is stopped after a predetermined period of time has elapsed, and when the cooling water pump does not stop, the chilled water pump and the refrigerant pump are operated for several minutes. After that, the refrigerant pump is stopped, and the operation of the chilled water pump is maintained until the cooling water pump is stopped.After the cooling water pump is stopped, if a predetermined period of time has elapsed when the chilled water pump is stopped, the absorption liquid pump is stopped. A method for stopping operation of an absorption chiller and a cold/hot water machine, characterized by stopping the operation of an absorption chiller and a cold/hot water machine. (2) When stopping the cooling operation of an absorption chiller or water chiller/heater, the cooling water pump that distributes cooling water to the absorber pipe and condenser pipe, the cold water pump that distributes cold water to the evaporator pipe, and the inside of the evaporator. In an operation stop device that dilutes the absorption liquid by maintaining the operation of the absorption liquid pump that sends out the absorption liquid from the absorber after stopping the refrigerant pump for distributing the refrigerant, the absorption refrigerating machine In order to stop the operation of the water machine, an operation stop command switch that instructs to stop the supply of a heating source to the heating device, a cooling water flow confirmation switch provided in the cooling water pipe, the operation stop command switch and the cooling Immediately outputs a stop command for the chilled water pump and refrigerant pump when there is no circulation of cooling water based on a signal from a water circulation confirmation switch;
On the other hand, when there is a flow of cooling water, an operation command control means outputs a command to stop the refrigerant pump after continuing to operate the cold water pump and the refrigerant pump for several minutes, and absorption refrigeration characterized by comprising: A device to stop the operation of water heaters and cold water machines.