Influence of electronic expansion valve on heating performance of vehicle heat pump system

Abstract

In this paper, based on the regulation characteristics of electronic expansion valve, an experimental platform is built for studying a vehicle heat pump system. Under an ultra-low temperature condition of -10?C, the influence of the super-heat setting value of the electronic expansion valve on the main heating performance parameters of the system is analyzed. The results show that when the superheat setting value of the main valve increases from 2 K to 8 K, the discharge temperature of the compressor increases, the heating capacity of the system decreases by 12.6%, and the compressor power decreases by 15.9%. When the superheat setting value of make-up valve increases from 15 K to 30 K, the discharge temperature of the compressor increases, the heating capacity of the system decreases by 17.7%, and the compressor power decreases by 22.0%.

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“…The electronic expansion valve at the inlet and the outlet state parameter changes in a very fast response time, while its time constant is very small compared with the heat exchanger, so the electronic expansion valve characteristics can be described by a steady-state equation, and the assumption that the throttling process is adiabatic means that throttling does not occur with the outside world regarding heat transfer in the valve parts and so the import and export enthalpy value is unchanged, and the model for this is shown in eqn (24).where dm is the mass flow rate of the electronic expansion valve, Cq is the flow coefficient, A is the throttling area, ρ is the refrigerant inlet density, and Δ P is the pressure difference before and after the valve. 35,36…”