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R600a를 이용한 소형 2단압축 시스템의 성능특성에 관한 실험적 연구
김영헌(Youngheon Kim),주영주(Youngju Joo),김용찬(Yongchan Kim),서국정(Kookjeong Seo) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
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.
열전소자를 이용한 싱글 및 캐스케이드 냉동시스템의 냉각 성능에 관한 연구
임창학(Changhak Lim),김동우(Dongwoo Kim),김용찬(Yongchan Kim),서국정(Kookjeong Seo) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.12
The purpose of this study is to improve the cooling performance of single and cascade refrigeration systems using thermoelectric modules. The system consists of a heat sink, fan, and thermoelectric module. The operating parameters considered in this study include power distribution between the first- and second-stage thermoelectric modules, air flow, and variable condensing unit. The cooling capacity increased with decreases in the temperature difference between hot and cold surfaces, but decreased with increases in the condensing temperature. The COP decreased with increasing electric power of the thermoelectric module because of the increased Joule heat. The cooling performance improvement using the thermoelectric module is represented by the freezer temperature.