JPS6150228B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerator that uses water as a refrigerant and a salt solution such as lithium bromide as an absorbent. The purpose is to shorten the startup time and improve the startup characteristics.

Generally, the refrigerant vapor that is heated and separated in the generator of an absorption refrigerator is liquefied in the condenser and distributed to the evaporator, while the absorption liquid from which the refrigerant has been separated in the generator is cooled by cooling water. It is circulated and distributed to the absorber. However, cooling the absorption liquid when the temperature of the absorption liquid has not risen sufficiently, such as when the chiller starts operating, increases the time it takes for the absorption chiller to reach normal operation, and increases the temperature of the chiller. This resulted in a decrease in operating efficiency.

The present invention aims to improve the start-up of the absorption chiller by reducing such heat loss at the time of starting operation of the absorption chiller, and to quickly shift to normal operation and improve the operating efficiency of the chiller. This will be explained below according to the embodiments shown in the drawings.

1 has a heating chamber 3 with a combustor 2 such as a gas burner, and a high temperature generator that heats the absorption liquid and vaporizes and separates the refrigerant; 4 uses the heat of the gaseous refrigerant generated in the high temperature generator 1; 5 is a cooler 6 using cooling water;
A condenser 7 condenses and liquefies the refrigerant flowing in from both generators 1 and 4, and a condenser 7 distributes and vaporizes the liquid refrigerant, thereby sending it from a water cooler 8 to an external cooling load (not shown) for cooling. evaporator supplying cold water, 9
The continuous cooling function in the evaporator 7 is achieved by dispersing the absorption liquid flowing from the low temperature generator 4, absorbing the vaporized refrigerant in the evaporator 7, and cooling the reaction heat generated at this time in the cooler 10. 11 and 12 are heat exchangers that exchange heat between absorbing liquids having different temperatures; 13 is a water cooler 8;
14 is a heating control valve that also controls the amount of heating in the high temperature generator 1, and 15 is a control valve that controls the amount of absorption liquid sprayed to the absorber 9 according to the temperature of cold water discharged from the absorber 9. A control valve 16 controls the amount of absorption liquid flowing into the low temperature generator 4 from the absorber 9. A detector 17 detects the liquid level or temperature of the high temperature generator 1. 18
The starting controller 19 that controls the control valve 15 and the control valve 16 or the control valve 13 in response to input from the start controller 19 is a load controller that controls the control valve 13 and the heating control valve 14.

In such a configuration, when the absorption refrigerator starts operating, the flow of cooling water to the coolers 6 and 10 is stopped, and the start controller 17 opens the control valve 16 to stop the absorption liquid discharged from the absorption liquid pump 20. from the low temperature generator 4 through the heat exchanger 11 and immediately into the absorber 9.
The refrigerant vaporized in the high-temperature generator 1 is cooled and liquefied by the absorption liquid, while the opening degree of the control valve 15 is adjusted so that the amount of absorption liquid flowing into the high-temperature generator 1 is normal. This is to maintain the liquid level in the generator.

Incidentally, when the amount of absorption liquid flowing into the low temperature generator 4 mentioned above is sufficient, the control valve 15 is not used.
Alternatively, the control valve 13 may be controlled by the controller 17.

In this way, at the start of operation, the flow of cooling water is stopped while reducing the amount of absorption liquid sent to the high-temperature generator 1, and the amount of heating heat in the high-temperature generator 1 is used only for separating the refrigerant from the absorption liquid, and the low-temperature generation By flowing a low-temperature absorption liquid into the container 4, the refrigerant vaporized in the high-temperature generator 1 can be condensed with the absorption liquid without using cooling water, thereby reducing heat loss and improving the pressure balance of the absorption refrigerator system and the concentration difference. This improves the start-up characteristics of the absorption chiller and allows it to shift to the desired cooling operation in a short period of time.

Note that when transitioning to normal operation, the control valve 16 is closed, the control valve 15 is opened, and the starting controller 17 is closed.
stops its operation, and the operation of the absorption refrigerator is controlled by the load controller 19 as in the conventional case.

[Brief explanation of the drawing]

The figure is a refrigeration cycle diagram of an absorption refrigerator showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... High temperature generator, 4... Low temperature generator, 5... Condenser, 7... Evaporator, 9... Absorber, 15, 16... Absorption liquid control valve, 18... Start controller.

Claims (1)

[Claims] 1 High temperature generator, low temperature generator, condenser, evaporator,
A high temperature generator and a high temperature generator are installed on the discharge side of the absorption liquid pump, which connects the absorber, heat exchanger, etc. with piping to form a circulation cycle of refrigerant and absorption liquid, and returns the diluted absorption liquid at the bottom of the absorber to the generator. Each valve is provided to control the amount of dilute absorption liquid flowing into the low-temperature generator, and when the absorption refrigerator starts operating, the dilute absorption liquid is directly supplied to the low-temperature generator while limiting the amount of dilute absorption liquid flowing into the high-temperature generator. An absorption chiller that allows the flow to flow into the air.