In lithium bromide absorption refrigeration, since the lithium bromide aqueous solution itself has a very high boiling point (1265 ° C) and is extremely volatile, it can be considered that the vapor on the surface of the lithium bromide saturated solution is pure water vapor; at a certain temperature, the lithium bromide aqueous solution is on the liquid surface. The water vapor saturation partial pressure is smaller than the saturated partial pressure of the pure water; and the higher the concentration, the smaller the water vapor saturation partial pressure on the liquid surface. Therefore, under the same temperature conditions, the greater the concentration of lithium bromide aqueous solution, the stronger its ability to absorb water. This is why lithium bromide is usually used as an absorbent and water is used as a refrigerant. The lithium bromide absorption chiller is mainly composed of a generator, a condenser, an evaporator, an absorber, a heat exchanger, a circulation pump and the like. During the operation of the lithium bromide absorption chiller, when the lithium bromide aqueous solution is heated by the heat medium water in the generator, the water in the solution is continuously vaporized; as the water is continuously vaporized, the concentration of the lithium bromide aqueous solution in the generator is continuously increased. Entering the absorber; the water vapor enters the condenser, is cooled by the cooling water in the condenser, and becomes a high-pressure low-temperature liquid water; when the water in the condenser enters the evaporator through the throttle valve, it rapidly expands and vaporizes, and During the vaporization process, a large amount of heat of the refrigerant water in the evaporator is absorbed, thereby achieving the purpose of cooling and cooling; in this process, the low-temperature water vapor enters the absorber, is absorbed by the lithium bromide aqueous solution in the absorber, and the solution concentration is gradually reduced, and then the circulation pump is further Return to the generator to complete the cycle. This cycle is continuous, and the cooling capacity is continuously produced. Since the lithium bromide solution has been cooled in the absorber and the temperature is low, in order to save the heat of the heated dilute solution and improve the thermal efficiency of the whole device, a heat exchanger is added to the system to allow the generator to flow out of the concentrated solution and absorb the high temperature. The low temperature dilute solution flowing out of the device exchanges heat to increase the temperature of the dilute solution entering the generator. However, if a problem occurs, the lithium bromide refrigerator is repaired.