THERMODYNAMIC ANALYSIS OF A CO_2 TRANS-CRITICAL REFRIGERATION SYSTEM WITH EJECTOR FOR HIGH AMBIENT CONDITIONS

摘要

CO_2 as a refrigerant in cooling application is believed to have a prominent scope in warm weather countriesrnlike India in near future. In this article we present an ejector sub cooled trans-critical CO_2 based refrigerationrncycle and its thermodynamic analysis. The proposed configuration incorporates two intermediate separatorsrnand an ejector employed between gas cooler outlet pressure and the lower separator pressure. With the help ofrnejector, the vapour generated at low pressure separator is pumped to the high pressure separator and their byrnliquid in the low pressure separator is sub cooled. The performance of the proposed cycle is compared with anrnefficient parallel compression cycle for wide range of evaporation temperature. The result substantiates ourrnclaim and exhibits better performance for the proposed configuration at all investigated conditions over thernparallel compression cycle, a maximum of about 10% improvement in COP is observed.