Abstract
Hydrocarbon refrigerants such as isobutene are hopeful for the refrigeration cycle, as they exist in a state of nature. But the efficiencies of those cycles must be increased in the standpoint of decreasing the carbon dioxide emissions. We had been researching the two-phase ejector that recovers the energy loss at the expansion to reduce the compressor work. In this report, the coefficients of performance of the two-phase ejector system for the refrigeration cycle using isobutene are estimated by the theory of the ideal ejector. And the results of the system using isobutene are compared with those of R-134a. It is elucidate that the two-phase ejector cycle can be applied to the refrigeration cycle using isobutene as well as that of R-134a. And the increase in the coefficients of performance became large as the temperature of evaporator decrease. At-30 degrees of centigrade about 40% increase in the coefficients of performance is obtained by the ejector cycle.
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