In the face of serious energy and environment problems

energy conservation and environmental protection have always been the hotspot that needs special attention in national and international aspects. Combining the advantage of high temperature heat pump and natural refrigerant of water

water vapor high temperature heat pump system (WVHTHP) is the ideal heat pump system in the next generation. WVHTHP not only can effectively recycle low grade waste energy but also is a green and sustainable technology. The preliminary study shows the closed water vapor compression heat pump cycle is feasible under the condition of negative pressure evaporation and positive pressure condensation. And the confirmatory test show that when the compressor suction temperature is fixed 80℃ and the discharge temperature increases from 117℃ to 133℃

the system pressure ratio increases from 3.47 to 5.94 and the system COP decreases from 5.8 to 3.7. When the compressor discharge temperature is 120℃

and the system pressure ratio is 4.2 and the system COP is nearly 5. The system performance of WVHTHP is very superior

and it has great potential in industrial application.