GENERAL THERMODYNAMIC MODEL FOR ANALYSIS OF TWO-STAGE VAPOR COMPRESSION REFRIGERATION SYSTEM USING R32 REFRIGERANT

Abstract

Two-stage vapor compression refrigeration systems improve the cooling coefficient (COP) by performing compression in two stages, reducing the heat load on the compressor and improving energy efficiency. When using R32 refrigerant, the system not only achieves higher cooling efficiency but is also more environmentally friendly. In this study, a thermodynamic calculation program for two-stage vapor compression refrigeration systems was performed to investigate the effects of sub-cooling, de-superheating and intermediate pressure on COP. The sub-cooling and de-superheating parameters were varied from 0 to 1 to investigate a variety of cycles from single stage to multiple two-stage cycles. The results showed that the intermediate pressure deviation ratio should be between 1.02 and 1.04 to achieve the largest COP. The two-stage vapor compression refrigeration cycle with complete sub-cooling and complete de-superheating in the intermediate tank has a COP of up to 3.5 while the single-stage vapor compression refrigeration system achieves a COP of 3.1 under the same operating conditions.