This paper refers to an analysis of performance in a rolling piston type hermetic compressor for a room air-conditioner. First, influences of several factors on compressor performance were studied experimentally. Cylinder pressure was measured accurately with very small piezoelectric transducers, and temperatures of refrigerant gas, oil, and cylinder wall were measured at the same time. Detail distribution and rates of losses in a rotary compressor were made definite from the results of the experiment. Motor loss was about 50 percent, heat loss (consisted of chiefly both leakage loss and heat transfer loss) was about 20 percent of total loss. Then heat exchange in a cylinder was simulated in order to estimate respectively leakage loss and heat transfer loss which v/ere difficult to separate from each other with the experiment. In the simulation considering leakage of hot refrigerant gas and oil through piston clearances and heat transfer from a cylinder wall to gas in a cylinder, volumetric efficiency which is one of performance index was estimated too. The results from the simulation were found to agree well with those from the experiment. Decreasing heat transfer loss was found to be very important for improving performance as well as decreasing leakage loss. Then further scope for improving performance was studied.
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