18 May 2017
The traditional refrigerants such as CFCs or HCFCs has been phased out for ODP and many HFCs is being phased down for their relatively high GWP. Among all the substitutions, the mixture has become much attractive because it can reach a balance between thermodynamic performance and environmental effects. R32/R1234ze(E) is one of them. At the same time, the technology of vapor injected technology is widely applied in heat pump under low temperature ambient for its great performance improvement. In this paper, the vapor injected heat pump model with R32/R1234ze(E) is established, the injection ratio, heating capacity and COP performance with variable concentrations is analyzed and compared with that of single-stage compression system.