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 Heat pump in the falling film evaporator used in the application of heat pump hot compression machine compression device for centrifugal and positive displacement compressors. Larger temperature difference between compression, generally around 11 ℃, which limits the use of mechanical compression heat pump efficiency generally does not exceed a maximum of three-way, the higher the boiling point of the solution increases when evaporation is limited, and the structure of complex, high cost , high maintenance costs, power consumption, and therefore the application of mechanical compression heat pump rarely.

     The use of steam jet pump jet pump steam spit in the shape of the text body and it does not drive, a simpler structure, the application more. With heat pump, compared with non-heat pump can be equal to increase efficiency.