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Performance prediction for heat pump system with flash tank coupled with scroll compressor

SYNOPSIS A heat pump system with a flash tank is suitable to use as the thermodynamic cycle in the compact air-source heat pump for cold climate regions. This paper presents the characteristics of a novel heat pump system with a flash tank coupled with a scroll compressor and its improved system; the proposed apparatus has been named the heat pump system with flash reservoir. With the aid of an analytical model based on the first law of thermodynamics and experimental data, the performance of the two systems are predicted in detail. The calculated results show that the two systems can improve the heating capacity efficiently when run under the conditions of low climate temperature, and the intermediate pressure evaluated between 8 bar and 10 bar is favourable for the two systems.