The study on performance characteristic of domestic refrigerators is an important issue for energy saving because of its long running time and wide usage. In this study, experiment was conducted to analyze temperature distribution of a reciprocating compressor and performance of a refrigerator under actual operating condition. And effect of heat property inside compressor is implicated in performance of a refrigerator. The temperature distribution in the compressor and performance of the system were measured with temperature in a refrigerating compartment and a freezer, ambient temperature, and fan velocity during steady-state of the system of the refrigerator. Continuous running of the compressor causes temperature in refrigerating compartment to fall far from actual operating temperature. For running the system as actual operating temperature, an electric heater was installed in the freezer. And special temperature sensors were installed inside the compressor to obtain internal temperatures distribution. Ambient temperature and temperature in refrigerating compartment cause evaporating pressure of the system to vary. And it causes mass flow rate of refrigerant to vary. Also velocity of the fan outside compressor causes temperature of refrigerant inside the compressor to vary, and it causes superheat degree of refrigerant in compressor to vary. Therefore evaporating pressure of the system and superheat of suction refrigerant in compressor cause mass flow rate of refrigerant in the compressor to vary. It influences on refrigerating capacity of the system and volumetric efficiency of the compressor. As a conclusion, it is clear that the refrigerating capacity of a refrigerator varies evaporating pressure of the system and superheat of suction refrigerant in the compressor under actual operating condition.
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