JPS5824706B2 - Control device for dual effect absorption chiller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a dual-effect absorption chiller, which improves efficiency particularly at partial loads, stabilizes chilled water temperature, and shortens start-up time at startup. At the same time, the purpose is to improve liquid circulation.

In general, in relatively small capacity absorption chillers of 20 refrigeration tons or less, burners with 0N-OFF control are used in order to have a small amount of combustion and to keep the structure simple and inexpensive. is controlled.

Therefore, when there is a partial load during cooling, the burner is turned off when the chilled water temperature drops, but when combustion stops, the spraying of the refrigerant and absorption liquid also stops.

Therefore, there was a drawback that the refrigerant capacity became zero and the efficiency during the partial load period was lower than that during the full load period.

The present invention has been made in view of the above points, and an embodiment shown in the drawings will be described below.

1 is a high-temperature generator that boils the tank liquid in the combustor 2 to generate refrigerant vapor, and 3 is a separator that separates the tank liquid and refrigerant pumped up from the high-temperature generator 1 together with refrigerant vapor bubbles. , 4 is a low temperature generator that reheats the intermediate liquid using the refrigerant vapor sent out from the separator 3 as a heat source and further separates the refrigerant; 5
7 is a condenser that cools and condenses the refrigerant flowing into the cooler 6 from the separator 3 and the low temperature generator 4; an evaporator configured to obtain cold water for cooling from a water cooler 8;
After separating the refrigerant from the intermediate liquid in the low-temperature generator 4, the concentrated liquid is dispersed to absorb the refrigerant vapor in the container, thereby maintaining the inside of the evaporator 7 at a low pressure and continuously supplying cold water. 10 and 11 are low-temperature heat exchangers and high-temperature heat exchangers, 12 is a level tank, and these are pumped liquid t
13, refrigerant vapor pipe 14, refrigerant liquid down-flow pipe 15, refrigerant circulation path 17 with bubble pump 16, tank liquid pipes 19, 20, 21 with absorption liquid pump 18, intermediate liquid pipe 22 and concentrated liquid pipe 23. The separator 3 and the level tank 12 are connected through a pressure equalization pipe 24 to form a refrigeration cycle.

The refrigerant liquid down-flow pipe 15 is connected to a refrigerant dispersion device 25 located above the evaporator 7, and a refrigerant tank 26 is formed on the upstream side of the dispersion device.
is connected to the refrigerant outflow pipe 27 by a side pipe 28 which similarly has a solenoid valve Sv1.

Further, the separator 3 and the absorption liquid dispersion device 29 located above the absorber 9 are connected through a solution conduit 30 having a solenoid valve S2.

THl is a thermostat that detects the outlet temperature of the water cooler 8, and a signal from the thermostat opens and closes the fuel control valve 31 of the high temperature generator 1, and also opens and closes the fuel control valve 31 of the high temperature generator 1, and also opens and closes the fuel control valve 31 of the high temperature generator 1. SV2
Open and close.

Additionally, a thermostat TH detects the liquid temperature of the high temperature generator 1.
2 also causes both of the solenoid valves S■1. Sv2 can be opened and closed.

In the above configuration, during normal operation, the fuel control valve 31 is open;
Both electromagnetic valves SV1 and SV2 are closed, and the refrigerant liquid flowing down from the condenser 5 to the refrigerant spargeer 25 is stored in the refrigerant tank 26 on the way, and then flows from the upper part of the tank into the refrigerant outflow pipe 2.
The refrigerant 7 flows through the refrigerant dispersion device 25, is dispersed in the evaporator 8, and is vaporized.

As a result, the temperature of the cold water supplied from the water cooler 8 to the cooling load gradually decreases until it reaches the set value and becomes a partial load.

At this time, when the cold water temperature decreases, the combustion control valve 31 is closed in response to a signal from the thermostat THL, and the combustion operation of the combustor 2 is stopped.

When the magnetic valves S1 and S2 are opened in response to the signal from the thermostat THl or the signal from the thermostat TH2 which detects the liquid temperature of the high temperature generator 1, the refrigerant is stored in the tank 26 and sent to the evaporator 8. Since the refrigerant flows into the absorber 9 through the side pipe 28 and the intermediate absorption liquid from the separator 3 flows into the absorber 9 through the solution conduit 30, it is possible to maintain the refrigeration capacity, and at the same time, the temperature of the chilled water increases. can be prevented.

Furthermore, by opening the solenoid valve Sv2, it is possible to prevent a rise in the liquid level in the separator 3 and cavitation troubles in the absorption liquid pump 18 during partial load.

In addition, if the solenoid valve SV1 connected to another electric circuit is closed and the solenoid valve Sv2 is opened when the operation of the absorption chiller is stopped, in preparation for the next restart of operation, the start-up standby solenoid valves SV1 and S If 2 is opened, the refrigerant and absorption liquid are sprayed into the evaporator 7 and absorber 9 at the same time as the start of operation, so the start-up time is significantly shortened and the problem of poor circulation of the absorption liquid is also solved at the same time.

In addition, when obtaining hot water from the water cooler 8, use the on-off valves installed in the pipes 32 and 33■1. ■If both 2 are opened and the flow of cooling water to the absorber 9 and the cooler 6 is stopped, the high temperature generator 1
The refrigerant heated in the separator 3 separates the refrigerant and becomes an intermediate liquid.The refrigerant vapor flows through the pipe 33 into the absorber 9, and the refrigerant vapor flows through the pipe 32, the upper space of the low temperature generator 4, and the U-seal pipe 34.
It flows into the evaporator 7, condenses through heat exchange with water, and is absorbed into the absorption liquid.

This provides hot water for heating.

As described above, the present invention configures a refrigeration cycle by connecting a high temperature generator, a separator, a low temperature generator, a condenser, an evaporator, an absorber, a low temperature heat exchanger, a high temperature heat exchanger, etc. In a double-effect absorption refrigerator that supplies chilled water heat exchanged with a load to a load, the refrigerant distribution device located above the condenser and evaporator is connected by a side pipe having a solenoid valve S1. At the same time, the separator and the absorption liquid distribution device located above the absorber are connected by a solution conduit having a solenoid valve Sv2, and the temperature of the cold water supplied from the evaporator is detected by a thermostat TH1, and the temperature of the cold water supplied from the evaporator is detected by a thermostat TH1, and the high temperature is adjusted at partial load. This is because the heating control valve of the generator is closed and both the electromagnetic valves S1SV2 are opened by either the thermostat 1-TH1 or the thermostat TH2 that detects the liquid temperature of the high temperature generator. The refrigerating capacity can be maintained even under partial load, increasing efficiency and stabilizing the chilled water temperature by preventing it from rising.

It also has practical effects such as preventing the rise in liquid level in the separator and cavitation problems in the absorption pump.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of a dual-effect absorption refrigerator equipped with the device of the present invention. 1... High temperature generator, 3... Separator, 7... Evaporator, 8... Water cooler, 25... Refrigerant distribution device, 29...
Absorption liquid sprayer, THL... thermostat, TH2...
・・Thermostat, Svl・Solenoid valve, S■2・・
·solenoid valve.

Claims (1)

[Claims] 1 A refrigeration cycle is constructed by connecting a high temperature generator, a separator, a low temperature generator, a condenser, an evaporator, an absorber, a low temperature heat exchanger, a high temperature heat exchanger, etc., and the cold water heat exchanged with the evaporator is In a dual-effect absorption refrigerating machine configured to supply a load, a refrigerant tank is provided between the condenser and the refrigerant spreader located above the evaporator, and the tank and the refrigerant spreader are connected to each other by a solenoid valve S.
At the same time, the separator and the absorption liquid distribution device located above the absorber are connected by a side pipe having a solenoid valve S2, and the cold water supplied from the evaporator is connected by a side pipe having a solenoid valve S2. The temperature is detected by the thermostat) THL and the heating control valve of the high temperature generator is closed at partial load.
Both the solenoid valves S1. S■2
A control device for a dual-effect absorption refrigerator, characterized in that the device is configured to open.