EXERGETIC ANALYSIS OF CO_2 TRANS-CRITICAL REFRIGERATION SYSTEM WITH AND WITHOUT INTERNAL HEAT EXCHANGER USING EXPERIMENTAL DATA

摘要

This paper presents exergetic analysis of a CO_2 trans-critical refrigeration system based on experimental datarnfor warm weather condition up to 45℃ .Results from configuration with and without internal heat exchangerrn(IHX) are compared for their performance at two different evaporator temperatures(0℃ and -5℃) and gasrncooler air flow velocity within range 1 m∙s~(-1) to 3 m∙s~(-1).rnThe experimental results demonstrate the relative advantage of use of IHX for high ambient operation. Forrncycle with IHX, the maximum enhancement in exergy efficiency is found to be 5.05 % at 0℃ evaporatorrntemperature while the same is found 4.60 % at -5℃ evaporator temperature. Component wise, compressorrnfollowed by gas cooler are found to have highest exergy destruction while that in IHXis found to bethernleast.