Abstract
Vapor compression very high temperature heat pumps (VHTHPs) with low-GWP refrigerants have attracted enormous attention for waste heat recovery. To yield high temperature output, a water vapor screw compressor with water-injection is developed and a VHTHP prototype is established to conduct the experimental investigation. The results show that when condensation temperature Tc increases from 110 to 150°C and evaporation temperature Te is 75°C, 80°C and 85°C, COP of this VHTHP ranges between 1.85-4.03, 1.89-4.88 and 1.96-6.10, respectively. COP can reach the highest value 6.10 with heating capacity of 284.7 kW at Te=85°C, Tc=117°C. What’s more, the highest condensation temperature of this water vapor VHTHP can reach 150°C with the COP of 1.96 when Te=85°C. So the water vapor VHTHP can supply pressured hot water or high temperature steam when the user is favourable. Considering the characteristic of high energy efficiency and environment friendly, this VHTHP is highly desirable and competitive.
Published Version
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