D151 CO2 冷凍機の性能における過熱度の影響

概要

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This paper aims to estimate the effect of the degree of superheat at compressor inlet on the CO_2 refrigeration cycle's performance and investigate the CO2 Brine-Chiller's COP to control the optimum degree of superheat. Based on the CO2 Brine-Chiller's characteristics, higher degree of superheat decreases refrigerating capacity and COP because the decrease of CO_2 mass flow rate caused by the density decreasing at compressor inlet affects the system performance more than the increase of latent heat at evaporator. According to the CO2 Brine-Chiller's operating data during two years, the degree of superheat at compressor inlet is approximately 20K. Therefore, COP of the CO2 Brine-Chiller will increase to control lower degree of superheat to avoid the CO_2 liquid-compression.
一般社団法人日本機械学会の論文
2003-11-10