JPH03156260A - Absorption cold/hot water producer - Google Patents

Abstract

PURPOSE:To securely prevent a refrigerant or cold water from being frozen and an absorption fluid from being crystallized by controlling the opening of a refrigerant control valve at the temperature of a cold water outlet upon hot water main control and further providing a mechanism for controlling the opening/closing of a solenoid valve. CONSTITUTION:Where a cold water load is rapidly reduced and hence cold water outlet temperature is rapidly lowered as an absorption cold/hot water machine is under hot water main control operation, the opening of a control valve 30 is increased and a refrigerant flows from an evaporator 2 to an absorber 3, sprayed absorption fluid concentration is diluted with refrigerant absorption capability being lowered and further with the concentration of the sprayed absorption fluid being diluted, whereby the refrigerant absorption capability is lowered to lower the cooling capability of the evaporator 2. When the cold water outlet temperature is further lowered, a solenoid valve 24 is opened, a refrigerant in a condenser 5 flows to the absorber 3 via the solenoid valve 34, whereby the refrigerant absorption capability is further lowered, the refrigerant in the condenser 5 flows to the absorber 3 via the solenoid valve 34. Thus, the refrigerant absorption capability is further lowered and hence the refrigerant or the cold water is securely prevented from being frozen and the absorption fluid from being crystallized. Further, also after a refrigerant pump 26 is interrupted, the refrigerant is the condenser 5 flows to the absorber 3 to prevent the absorption fluid from being crystallized.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an absorption chiller/heater that supplies cold water and hot water.

(b) Conventional technology For example, Japanese Patent Application Laid-Open No. 58-37460 discloses a control device for a dual-effect absorption chiller/heater. In this control device, a water heater is attached to a high temperature regenerator, and the chilled water load and hot water The fuel that can be supplied to the high-temperature regenerator is controlled by adding the load, and in the cooling main control, the refrigerant control valve (CM) installed in the pipe between the high-temperature regenerator and the condenser is fully opened, and the fuel that can be supplied to the high-temperature regenerator is fully opened. A refrigerant control valve (CM) installed in the pipe between the condenser and the condenser is operated proportionally to the hot water temperature. In addition, in the heating main control, the refrigerant control valve (CM,
) is proportionally controlled by the chilled water temperature, the refrigerant control valve (CM, ) is fully opened, and the refrigerant control valve (CM, ) installed in the piping between the water heater and the high temperature regenerator is opened.

Furthermore, for example, in Japanese Patent Application Laid-Open No. 64-54179, a water heater is attached to the high-temperature regenerator, the cold water load of the evaporator is determined by a cold water load detector, and when the cold water load is larger than a set value, high-temperature regeneration is performed based on the cold water outlet temperature. When the heating amount of the high temperature regenerator is controlled by the hot water temperature and the heating amount of the high temperature regenerator is controlled by the hot water temperature, when the cold water load is smaller than the set value, the heating amount of the high temperature regenerator is controlled by the hot water temperature, An absorption chiller/heater has been disclosed in which when the chilled water load decreases, the refrigerant discharged from the refrigerant pump is flowed to the absorber via a refrigerant blowing device to reduce the concentration of the absorption liquid and reduce the refrigerant absorption capacity.

(c) Problems to be Solved by the Invention In the control device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 58-37460, when the chilled water load decreases in the heating main control, the opening degree of the refrigerant control valve (CMI) decreases. , the amount of refrigerant sent from the high temperature regenerator to the condenser and the amount of refrigerant vapor generated in the low temperature regenerator are reduced, thereby reducing the amount of refrigerant sent from the condenser to the evaporator. Then, the amount of refrigerant sprayed in the evaporator decreases, and the cooling capacity decreases, but if the chilled water load decreases rapidly, the chilled water outlet temperature decreases faster than the cooling capacity decreases, and the chilled water decreases. There was a risk of freezing. In addition, when the amount of refrigerant sprayed in the evaporator decreases due to a decrease in the chilled water load, the concentration of the absorbent in the absorber increases, and accordingly the concentration of the absorbent in the absorbent circulation path increases, causing the concentrated liquid to flow. There was a risk that the absorption liquid would crystallize in the piping between the regenerator and absorber.

In addition, in the absorption chiller/heater disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 64-54179, when the chilled water load decreases and the chilled water outlet temperature suddenly decreases, the absorber refrigerant pump operates to stop the evaporator. Although it is possible to send refrigerant,
If the refrigerant pump stops operating before the chilled water outlet temperature drops rapidly and the cooling capacity decreases significantly, the refrigerant from the condenser will accumulate in the evaporator and will continue to flow through the absorber until it overflows and flows to the absorber. Since the refrigerant was not blown to the absorbent, the concentration of the absorbent increased, and there was a risk that crystals would form in the absorbent.

An object of the present invention is to reliably prevent freezing of the refrigerant or cold water and crystallization of the absorption liquid when the cold water load suddenly decreases when the absorption chiller/heater is operated under heating main control.

(d) Means for Solving the Problems In order to solve the above problems, the present invention provides a solution between the refrigerant pipe (15) between the condenser (5) and the evaporator (2) and the absorber (3). The refrigerant blow pipes (33), (29) connected to the refrigerant blow pipe (33), the solenoid valve (34) provided on the refrigerant blow pipe (33), and the refrigerant pipe (refrigerant circulation pipe) connected to the evaporator (2) (
Refrigerant blow pipe (2g) provided between the discharge side of the refrigerant pump (25) of 16) and the absorber (3), (29)
and a refrigerant blow control valve (30) provided in the refrigerant blow pipe (28). During hot water main control operation, the opening degree of the refrigerant blow control valve (30) is controlled based on the cold water outlet temperature, and a solenoid valve ( 34) A mechanism for controlling the opening and closing of the absorption chiller/heater is provided.

In addition, refrigerant blow pipes (33) and (29) are connected between the refrigerant pipe (15) and the absorber (3), and the refrigerant blow pipe (3) is connected between the refrigerant pipe (15) and the absorber (3).
A solenoid valve (34) is provided in the middle of the refrigerant blow pipe (2) between the refrigerant pipe (refrigerant circulation pipe) (16) and the absorber (3).
B), (29) are connected, a control valve (30) is provided in the middle of the refrigerant blow pipe (28), and an electromagnetic valve is connected to the refrigerant pipe (14) between the high temperature regenerator (7) and the condenser (5). An absorption refrigerator provided with a valve (24) and a mechanism for controlling the opening/closing of each solenoid valve (34), (24) and the opening degree of a control valve (30) by the cold water outlet temperature of the evaporator (2). It provides:

Furthermore, there are solenoid valves (34) installed in the middle of the refrigerant blow pipes (33) and (29) that flow the refrigerant from the condenser (5) to the absorber (3), and solenoid valves (34) that flow the refrigerant from the evaporator (2) to the absorber. (3) A control valve (30) provided in the middle of the refrigerant blow pipes (28) and (29), and the opening degree of this control valve (30),
and a mechanism for controlling the opening and closing of the solenoid valve (34) by the cold water load of the evaporator (2).

(*) When the action absorption chiller/heater is operating under hot water main control, if the chilled water load suddenly decreases and the chilled water outlet temperature suddenly drops, the opening degree of the control valve (30) will increase accordingly. , the refrigerant flows from the evaporator (2) to the absorber (3),
The concentration of the absorption liquid becomes thinner, the refrigerant absorption capacity decreases, and the concentration of the sprayed absorption liquid also becomes thinner, the refrigerant absorption capacity further decreases, and the cooling capacity of the evaporator (2) decreases.

If the cold water outlet temperature drops further, the solenoid valve (34
) opens, the refrigerant in the condenser (5) flows through the solenoid valve (34) to the absorber (3), and the refrigerant absorption capacity is further reduced, ensuring freezing of the refrigerant or cold water and crystallization of the absorbing liquid. It becomes possible to prevent Further, even after the refrigerant pump (26) is stopped, the refrigerant in the condenser (5) flows to the absorber (3), making it possible to prevent crystallization of the absorption liquid.

In addition, when the absorption chiller is operating under hot water main control, if the chilled water load suddenly decreases and the chilled water outlet temperature suddenly drops, the refrigerant in the evaporator (2) is removed via the control valve (30). flows to the absorber (3), and when the chilled water outlet temperature still decreases, the solenoid valve (24) closes and the amount of refrigerant flowing from the high temperature regenerator (7) to the condenser (5) rapidly decreases, causing the condenser ( 5)
The amount of refrigerant flowing from the to the evaporator (2) is reduced, and
When the chilled water outlet temperature drops, the refrigerant in the condenser (5) flows to the absorber (3), which significantly reduces the refrigerant absorption capacity of the absorber (3), causing freezing of the chilled water, crystallization of the absorption liquid, etc. becomes possible to avoid.

Furthermore, when the cold water load suddenly decreases during hot water main control operation,
The refrigerant in the evaporator (2) is passed through the control valve (30) to the absorber (
When the chilled water load further decreases, the refrigerant from the condenser (5) is transferred to the absorber (5).
3), which lowers the absorption capacity of the -layer refrigerant and prevents freezing of cold water etc. and crystallization of the absorption liquid.Furthermore, even after the refrigerant blowing from the evaporator (2) has stopped, the absorption capacity from the condenser (5) is reduced. The refrigerant flows into the container (3), making it possible to reduce the concentration of the absorption liquid.

(F) Example Hereinafter, an example of the present invention will be described in detail based on the drawings.

The drawing shows water (H!O) as the refrigerant and lithium bromide (L!O) as the absorbent.
This figure shows a dual-effect absorption chiller/heater using an iBr) solution, in which (1) is the evaporative absorption side with built-in evaporator (2) and absorber (3), and (4) is the condenser ( 5) and a low-temperature regenerator (6), (7) is a high-temperature regenerator equipped with a heater (8) such as a gas burner, and (9A) and (9B) are low-temperature heat exchangers, respectively. , and a high temperature heat exchanger, which are absorbent tubes (10), (IIA),
(11B), (12A), (12B), and refrigerant pipes (14), (15), and (16). A water heater (17) is attached to the high temperature regenerator (7), and the water heater (17) and the high temperature regenerator (7)
) A hot water drain control valve (20) is provided in the middle of a refrigerant drain pipe (18) connected between the two. Also, (21
) is a hot water pipe connected between the water heater (17) and the load;
(21A) is a hot water heat exchanger. Further, a fuel control valve (23) is provided in the fuel pipe (22) connected to the heater (8).

(24) is a first solenoid valve provided between the low temperature regenerator (6) and the condenser (5) of the refrigerant pipe (14). (25)
is a refrigerant tank, (26) is a refrigerant pump installed in the middle of the refrigerant pipe (16), and a refrigerant feed pipe (27) is installed between the discharge side of this refrigerant pump (26) and the refrigerant tank (25).
are connected, and the refrigerant tank (25) and absorber (3)
Refrigerant blow pipes (2B) and (29) are connected between them. A refrigerant control valve (30) is provided in the middle of the refrigerant blow pipe (28). Here, the outlet of the refrigerant blow pipe (29) is located approximately in the middle of the absorber (3) in order to prevent the absorption liquid from flowing back. or,
(31) is a refrigerant return pipe, (32) is a refrigerant overflow pipe, and the refrigerant overflowing from the weir (25A) is returned to the refrigerant pipe (15) via the refrigerant return pipe (31).

(33) is a refrigerant blow pipe connected between the refrigerant pipe (15) and the refrigerant blow pipe (29), and a 215th magnetic valve (34) is provided in the middle of this refrigerant blow pipe (33). There is. In addition, (35> is a cold water pipe piped to the evaporator (2), and an evaporator heat exchanger (
35A) is provided. (36) is the refrigerant reservoir (2A) of the evaporator (2) and the absorption liquid reservoir (3A) of the absorber (3).
This refrigerant pipe (36) is connected between
A valve (37) is provided in the middle.

(38) is a cooling water pipe, and an absorber heat exchanger (40) and a condenser heat exchanger (40) are installed in the middle of this cooling water pipe (38).
1) is provided. In addition, (42) is the absorption liquid pipe (10
) is an absorption liquid pump installed in the middle of the

(43) is the microcomputer control panel of the dual-effect absorption chiller/heater, (44) and (45) are the hot water pipe (21B) on the hot water outlet side of the water heater (17), and the hot water pipe on the hot water inlet side, respectively. (21C) attached to the first. This is a second hot water temperature detector. In addition, <46) and (47) are the first. This is a second cold water temperature detector. Then, the control panel (43), each temperature detector (44) or 46), and the hot water drain control valve (20)
, a refrigerant control valve (30), and a first. 2nd solenoid valve <24)
, (34) are connected. The control panel (43) has a second hot water temperature detector (45) and a second cold water temperature detector (
It operates by inputting hot water and cold water inlet temperature signals from 47), and depending on each detected temperature, cooling main control (chilled water main control) operation and heating main control (hot water main control) operation are shown in Figure 2. Switch as shown. The control panel (43) also has a first hot water temperature detector (44) and a first cold water temperature detector (46).
), the output temperature signals of the hot water and cold water are inputted, and opening signals are outputted to the fuel control valve (23), the hot water drain control valve (20), and the refrigerant control valve (30). 2nd'E
Outputs open/close signals to the magnetic valves (24) and (34). Here, a hot water drain control valve (20), a refrigerant control valve (30)
The opening degrees of are controlled as shown in FIGS. 3 and 4 according to the hot water outlet temperature and the cold water outlet temperature, respectively.

Below, regarding the operation of the above dual-effect absorption chiller/heater, i5
This will be explained based on the flowchart shown in the figure.

For example, in the summer, when the heating load (hot water load) is small and the cooling load (chilled water load) is large, the hot water inlet temperature of the water heater (17) is 54°C, and the cold water inlet temperature of the evaporator (2) is 11°C. As shown in Figure 2, the control panel (43) performs main cooling control. The control panel (43) then controls the first magnetic valve (24).
), a close signal to the refrigerant control valve (30), and a close signal to the second electromagnetic valve (34). Then, the refrigerant pump (25) and the absorption liquid pump (42) are operated as in the conventional dual-effect absorption chiller/heater, and the refrigerant and absorption liquid are circulated. In addition, the opening degree of the fuel control valve (23) changes according to the opening degree signal output by the control panel (43) based on the chilled water outlet temperature, and the amount of refrigerant generated by the high temperature regenerator (7) changes, causing the chilled water outlet temperature to change. is maintained at approximately the set temperature.

In addition, the control panel (43) which receives the signal from the first hot water temperature detector (44) outputs an opening signal to the hot water drain control valve (20) as shown in Fig. 3 based on the hot water outlet temperature. ,
The opening degree of the hot water drain control valve (20) is controlled to change the amount of drain. Therefore, the water level of the refrigerant stored in the water heater (21) changes, the amount of heat exchanged in the hot water heat exchanger (2IA) changes, and the hot water outlet temperature is maintained at approximately the set temperature. Thereafter, when the relationship between the hot water inlet temperature and the cold water inlet temperature falls within the cooling main control operation range shown in FIG. 2, the absorption chiller/heater is operated in the same manner as described above.

For example, in winter when the heating load is large and the cooling load is small and the hot water inlet temperature is 51°C and the cold water inlet temperature is 9°C, the control panel (43) is activated as shown in Figure 2.
performs heating main control operation, and the control panel (43) outputs an opening signal to the fuel control valve (23) based on the hot water outlet temperature detected by the first hot water temperature detector (44), and Outputs a 100% open signal to the hot water drain control valve (20). Therefore, based on the hot water outlet temperature, the high temperature regenerator (7)
The amount of heating is controlled, and the hot water outlet temperature is maintained at approximately the set temperature.

Further, the control panel (43) outputs an open signal to the first electromagnetic piece (24) based on the cold water outlet temperature, and outputs an opening signal to the refrigerant control valve (30>. When the air conditioner is on, the cooling load decreases and the chilled water outlet temperature reaches the first set temperature of 8°.
When the temperature drops below C, the opening degree of the refrigerant control valve (30) changes as the chilled water outlet temperature changes, as shown in FIG. After that, when the refrigerant load suddenly decreases and the chilled water outlet temperature falls below the second set temperature of 6.5°C, the close signal goes to the first T! , magnetic piece (2
4), the first solenoid valve (24) closes, and the refrigerant passes from the high temperature regenerator (7) to the condenser (5) via the refrigerant pipe (14).
) will no longer be sent to. Here, as mentioned above, when the chilled water outlet temperature decreases, the opening degree of the refrigerant control valve (30) increases, and from the evaporator (2) to the refrigerant pump (26), the refrigerant tank (25), and the refrigerant blow pipe (28). ), (29), and the amount of refrigerant flowing to the absorber (3) via the second refrigerant control valve (30) increases. Therefore, the amount of refrigerant sprayed in the evaporator (2) decreases, and the cold water cooling capacity of the evaporator (2) decreases.

Then, based on the change in the chilled water outlet temperature, the refrigerant control valve (3
0) changes in opening degree. When the cooling load further decreases and the chilled water outlet temperature decreases, the control panel (43) outputs a signal as the chilled water outlet temperature decreases, opening the refrigerant control valve (30) as shown in FIG. The temperature further increases, the amount of refrigerant flowing from the refrigerant tank (25) to the absorber (3) increases, and the amount of refrigerant sprayed in the evaporator (2) decreases. When the cooling load further decreases and the chilled water outlet temperature reaches the third set temperature of 6°C, the control panel (43) activates the second solenoid valve (34).
An open signal is output to the second solenoid valve (34), and the refrigerant accumulated in the condenser (5) passes through the refrigerant pipe (15) and the refrigerant blow pipe (33) to the absorber (29). 3), and the refrigerant absorption capacity further decreases. Also, control panel (43)
outputs a 100% open signal to the refrigerant control valve (30), the refrigerant control valve (30) is fully opened, and most of the refrigerant discharged from the refrigerant pump (26) flows to the absorber (3). As a result, the cooling capacity of the evaporator (2) further decreases.

After that, when the cooling load decreases and the chilled water outlet temperature drops to the fourth set temperature of 5°C, the control panel (43) operates to output a stop signal to the refrigerant pump (26), and the refrigerant pump (26) is stopped, and refrigerant dispersion in the evaporator (2) is stopped. Therefore, the cooling capacity of the evaporator (2) becomes almost zero. Thereafter, when the cold water outlet temperature becomes 3.0° C. or lower, the absorption chiller/heater abnormally stops.

Also, as mentioned above, after the refrigerant pump (26) stops, the cooling load increases, and the chilled water outlet temperature rises to, for example, 5.5°.
When the temperature reaches C, the control panel (43) outputs a signal to the refrigerant pump (26). Therefore, the refrigerant pump (26) starts operating. Then, the refrigerant is sent from the condenser (5) to the evaporator (2), and the refrigerant is dispersed to the evaporator heat exchanger (35A) by operating the refrigerant pump (26). Therefore, the cold water cooled by the evaporator heat exchanger (35A) is transferred to the evaporator (2).
to the load. Thereafter, when the cooling load further increases and the cold water outlet temperature reaches 6.5°C or higher, the second solenoid valve (34) closes.

If the cold water outlet temperature rises to 7.0°C or higher, the first magnetic piece (24) opens. Also, the cold water outlet temperature is 6.0
When the temperature exceeds °C, the refrigerant control valve (3
0) is controlled.

Thereafter, during main heating control, the opening degree of the fuel control valve (23) is controlled by the hot water outlet temperature in the same way as above, the heating amount of the high temperature regenerator (7) changes, and the amount of refrigerant vapor generated changes. Hot water outlet temperature is kept almost constant. Also, depending on the chilled water outlet temperature, the opening degree of the refrigerant control valve (30), the first. Opening/closing of the second solenoid valves (24), (34), and refrigerant pump (26)
) operation is controlled.

According to the above embodiment, when the cooling load decreases and the chilled water outlet temperature becomes equal to or lower than the first set temperature during heating main control operation, the opening degree of the refrigerant control valve (30) is controlled based on the chilled water outlet temperature. As the chilled water outlet temperature decreases, the opening degree of the refrigerant control valve (24) increases, and the amount of refrigerant sent from the evaporator (2) to the absorber (3) increases, and the amount of refrigerant that is distributed by the evaporator (2) increases. The amount of refrigerant used is reduced, and a sudden drop in the chilled water outlet temperature can be prevented. In addition, when the chilled water outlet temperature further decreases, the first solenoid valve (24) is closed, the refrigerant from the high temperature regenerator (7) to the condenser (5) is stopped, and the second solenoid valve (24) is closed.
By opening the solenoid valve (34) and stopping the operation of the refrigerant pump (26), the chilled water cooling capacity in the evaporator (2) can be reduced to almost zero, preventing the temperature of the chilled water from further decreasing. In addition, the refrigerant accumulated in the condenser (5) can be flowed to the absorber (3) to further dilute the concentration of the dilute absorption liquid flowing out from the absorber (3). , absorption liquid tube (10), (IIA).

(IIB>, (12A), (12B), the concentration of the absorption liquid flowing through the high temperature heat exchanger (9B), and the low temperature heat exchanger (9A) can be reduced, and as a result, the concentration of the absorption liquid flowing through the low temperature heat exchanger (9A) can be reduced. ), etc. Also, even after the refrigerant pump (26) has stopped, the condenser (5) can be prevented from forming.
) to the absorber (3), the concentration of the absorption liquid can be reduced, and crystals of the absorption liquid can be more reliably prevented.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, the refrigerant pump (26
) between the refrigerant pipe (16) on the discharge side and the absorption liquid pipe (10) on the inlet side of the absorption liquid pump (42).
) and a second refrigerant control valve (30) is provided in the middle of this refrigerant blow pipe (50), similar effects can be obtained. Furthermore, the second electromagnetic valve (34) may be replaced with a control valve, and this control valve may be fully opened when the cold water outlet temperature is 6.0°C or less, as in the above embodiment.

(g) Effects of the invention The present invention is an absorption chiller/heater configured as described above,
In an absorption chiller/heater equipped with a mechanism for switching between cold water main control operation and hot water main control operation, between the refrigerant pipe between the condenser and the evaporator and the absorber, and between the refrigerant pipe and the absorber A solenoid valve is provided in the refrigerant blow pipe of the refrigerant circulation pipe, and a refrigerant control valve is provided in the refrigerant blow pipe between the refrigerant pump outlet side of the refrigerant circulation pipe and the absorber, and during hot water main control, the refrigerant is controlled using the cold water outlet temperature of the evaporator. Since the opening degree of the valve is controlled and the opening and closing of the solenoid valve is controlled, when the chilled water load is small and the chilled water outlet temperature is low during hot water main control operation, the opening degree of the refrigerant control valve is increased and evaporation is prevented. The amount of refrigerant flowing from the refrigerant to the absorber through the refrigerant blow pipe increases and the refrigerant absorption capacity of the absorber decreases, and the amount of refrigerant discharged from the refrigerant pump and sprayed by the evaporator decreases, causing the evaporator to The cooling capacity can be reduced according to the drop in the chilled water outlet temperature, and when the chilled water outlet temperature drops, the solenoid valve is opened and the refrigerant accumulated in the condenser is flowed to the absorber via the refrigerant blow pipe. By diluting the concentration of the absorption liquid, the refrigerant absorption capacity of the absorber can be rapidly reduced, and as a result, even if the chilled water load suddenly decreases during hot water main control operation, a significant drop in the chilled water outlet temperature can be avoided. It can prevent cold water from freezing. In addition, by flowing the refrigerant accumulated in the evaporator and condenser to the absorber, the concentration of the absorption liquid can be significantly reduced.
Crystallization of the absorption liquid can be reliably prevented. Kirani,
After the refrigerant pump stops, the refrigerant flows from the condenser to the absorber, and the concentration of the absorption liquid becomes diluted, making it possible to reliably prevent the formation of crystals.

In addition, a solenoid valve is installed in the refrigerant pipe between the regenerator and the condenser, a solenoid valve is installed in the refrigerant pipe between the condenser and evaporator, and a refrigerant blow pipe between the absorber, and the refrigerant circulation pipe and A control valve is provided in the refrigerant blow pipe between the absorber and the opening degree of this control valve and the opening/closing of each of the above-mentioned xi valves are controlled by the cold water outlet temperature of the evaporator, so that the hot water main control operation of the absorption chiller/heater is performed. Sometimes, when the chilled water load suddenly decreases, the opening degree of the control valve increases as the chilled water outlet temperature decreases, and the amount of refrigerant flowing from the absorber to the evaporator increases, reducing the refrigerant absorption capacity of the absorber and reducing evaporation. Furthermore, when the chilled water outlet temperature drops, the solenoid valve of the refrigerant pipe is closed and the solenoid valve of the refrigerant blow pipe is opened, significantly reducing the amount of refrigerant flowing from the regenerator to the condenser. At the same time, the refrigerant in the condenser is flowed to the absorber, reducing the refrigerant absorption capacity of the absorber to #
It is possible to reduce the cooling capacity of the evaporator by rapidly diluting the concentration of the absorption liquid, and as a result, it is possible to avoid a significant drop in the cold water outlet temperature and prevent the cold water from freezing. crystallization can be prevented.

Furthermore, a solenoid valve is installed in the piping that flows the refrigerant from the condenser to the absorber, and a control valve is installed in the piping that flows the refrigerant from the evaporator to the absorber.
By controlling the opening degree of this control valve and the opening/closing of the above-mentioned solenoid valve by the chilled water load of the evaporator, when the chilled water load suddenly decreases, the opening degree of the control valve is increased as the chilled water load decreases, and the evaporator It is possible to flow refrigerant from the evaporator to the absorber, dilute the absorption liquid concentration in the absorber, reduce the refrigerant absorption capacity of the absorber, and reduce the cooling capacity of the evaporator in accordance with the reduction of the chilled water load. When the chilled water load decreases, the solenoid valve is opened and the refrigerant in the condenser flows to the absorber, significantly reducing the refrigerant absorption capacity and the cooling capacity of the evaporator, thereby preventing the chilled water or refrigerant from freezing. can do.

[Brief explanation of the drawing]

1 to 5 show one embodiment of the present invention, and the first embodiment is shown in FIG.
Figure 2 is a diagram showing the circuit configuration of an absorption chiller/heater, Figure 2 is a diagram showing the relationship between heating main control and cooling main control based on hot water inlet temperature and cold water inlet temperature, and Figure 3 is a diagram showing the relationship between hot water outlet temperature and hot water drain control valve opening. FIG. 4 is a diagram showing the relationship between the chilled water outlet temperature and the opening degree of the refrigerant control valve, and FIG. 5 is a flowchart for explaining the operation of the absorption chiller/heater. (2>...Evaporator, (3)...Absorber, (5)
... Condenser, (6) ... Low temperature regenerator, (7).
...High temperature regenerator, (14), (15), (16
)... Refrigerant pipe, (20)... Hot water drain control valve,
(24)...First solenoid valve, (26)...Refrigerant pump, (2g), (29)...Refrigerant blow pipe,
Control valve, <33)... Refrigerant blow pipe, magnetic piece, (4
3)...Control panel. (30)...Refrigerant (34)...Second electric

Claims (1)

[Claims] 1. An absorber, a regenerator equipped with a water heater, a condenser, and an evaporator are connected via piping to form a refrigeration cycle, and the heating amount of the regenerator is determined by the cold water outlet temperature of the evaporator. In an absorption chiller/heater equipped with a mechanism for switching between cold water main control that controls the amount of heat generated by the regenerator and hot water main control that controls the heating amount of the regenerator based on the hot water outlet temperature, the refrigerant pipe between the condenser and the evaporator and the absorber a refrigerant blow pipe connected between the refrigerant blow pipe, a solenoid valve provided on the refrigerant blow pipe, and a refrigerant pump provided between the discharge side of the refrigerant pump and the absorber provided in the refrigerant circulation pipe connected to the evaporator. a refrigerant blow pipe, a refrigerant control valve provided in the refrigerant blow pipe, and a mechanism that controls the opening degree of the refrigerant control valve according to the cold water outlet temperature during main hot water control, and further controls the opening and closing of the solenoid valve. An absorption chiller/heater featuring the following features: 2. Connect an absorber, a regenerator with a water heater, a condenser, and an evaporator via piping to form a refrigeration cycle, and connect a refrigerant pipe between the condenser and evaporator to connect the evaporator to the evaporator. In an absorption chiller/heater configured to connect a refrigerant circulation pipe, supply cold water from an evaporator, and supply hot water from a water heater, a refrigerant blow pipe is connected between the refrigerant pipe and the absorber,
A solenoid valve is provided in the middle of this refrigerant blow pipe, a refrigerant blow pipe is connected between the refrigerant circulation pipe and the absorber, a control valve is provided in the middle of this refrigerant blow pipe, and the refrigerant blow pipe is connected between the regenerator and the condenser. A solenoid valve is installed in the middle of the refrigerant pipe, and each of the above solenoid valves is opened and closed.
and an absorption chiller/heater comprising a mechanism for controlling the opening degree of the control valve according to the chilled water outlet temperature of the evaporator. 3. Absorption cold/hot water by connecting an absorber, a regenerator with a water heater, a condenser, and an evaporator via piping to form a refrigeration cycle, supplying hot water from the water heater and cold water from the evaporator. In the machine, there is a solenoid valve installed in the middle of the pipe that flows the refrigerant from the condenser to the absorber, a control valve installed in the middle of the pipe that flows the refrigerant from the evaporator to the absorber, and the opening degree of this control valve.
and a mechanism for controlling the opening and closing of the electromagnetic valve according to the cold water load of the evaporator.