The hot water type LiBr absorption chiller is a hot water powered refrigeration unit. It adopts the aqueous solution of lithium bromide (LiBr) as a cycling working medium. The LiBr solution works as an absorbent and water as a refrigerant.
The chiller comprises primarily the generator, condenser, evaporator, absorber, heat exchanger, auto purge device, vacuum pump and canned pump.
Working principle: The refrigerant water in the evaporator evaporates away from the surface of the heat conducting tube. As heat in the chilled water is taken away from the tube, the water temperature drops and cooling is generated. The refrigerant vapor evaporated from the evaporator is absorbed by the concentrated solution in absorber and therefore the solution is diluted. The diluted solution in absorber is then delivered by the solution pump to the heat exchanger, where the solution is heated and the solution temperature rises. Then the diluted solution is delivered to the generator, where it is heated by hot water to produce refrigerant vapor. Then the solution becomes a concentrated solution. After releasing heat in the heat exchanger, the temperature of the concentrated solution drops. The concentrated solution then enters the absorber, where it absorbs the refrigerant vapor from the evaporator, becomes a diluted solution and enters the next cycle. The refrigerant vapor generated by the generator is cooled in the condenser and become refrigerant water, which is further depressurized by throttle valve or U-type tube and delivered to the evaporator. After the evaporation & refrigeration process, the refrigerant vapor enters the next cycle.
The aforesaid cycle occurs repeatedly to form a continuous refrigeration process.
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