R600a를 이용한 소형 2단압축 시스템의 성능특성에 관한 실험적 연구

The application of a two-stage refrigeration cycle with small capacity into a household refrigerator are very limited in literature. This paper presents the performance of two-stage and single-stage with compressor rpm and compressor combinations, and operating conditions. Based on experimental data, a proper compressor rpm combination of two-stage was determined. When the temperature difference between the condenser and F-evaporator was large, the COP of two-stage was higher than that of the single-stage. Generally, the two-stage system showed better performance than the single-stage system. When the external load of the two-stage cycle was the same as that of the single-stage cycle, the increase of the temperature of R-evaporator, which corresponds to intermediate temperature of the two-stage cycle, can enhance the system efficiency. As the temperature of the R-evaporator increased by 5 , the COP increased by 0.2.