0418 エジェクタサイクルに利用される炭酸ガス二相流ノズルの特性(S46-1 高効率ヒートポンプの要素技術とその応用(1),S46 高効率ヒートポンプの要素技術とその応用)

概要

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Carbon dioxide is one of the most hopeful refrigerants because it naturally exists in the atmosphere and has a minimal greenhouse effect. But when it is used in the standard VCC, the energy loss at the expansion valve is critically high. We have been researching on converging-diverging nozzles for the ejector-type refrigeration cycle which can replace the VCC and recover the expansion loss. In this particular study, the energy-conversion efficiencies of such nozzles having two-phase flow for different inlet conditions were measured. The supercritical inlet conditions used are within the standard operating conditions of the ejector-type refrigeration cycle, which are above the critical point of CO2. We found out through experiment that the efficiencies of the supercritical-liquid inlet conditions are higher than those of the other inlet conditions. The efficiency increases with the length of the diverging section.
2007-09-07