Jwo, C.-S.C.-S.JwoLin, M.-W.M.-W.LinLin, C.-Y.C.-Y.LinHsu, C.-W.C.-W.HsuChen, S.-L.S.-L.ChenSIH-LI CHEN2020-01-132020-01-132010https://scholars.lib.ntu.edu.tw/handle/123456789/448363This study presents a "cold-stored liquid-vapor heat exchanger" to improve the performance of dual-temperature refrigerator system, for the installation of "cold-stored liquid-vapor heat exchanger" to measure the improving the performance of system. The study designs four different experimental models for making analytical discussion, and these models include: Model-A, dual-temperature refrigerator system (control group); Model-B, electronic expansion valve, which replaces mechanical evaporating pressure regulating valve; Model-C, dual-temperature refrigerator system equipped with a "traditional liquid heat exchanger"; and Model-D, dual-temperature refrigerator system equipped with an "cold-stored liquid-vapor heat exchanger" developed by the study. As known from analysis of the experimental data, under the operation of Model-B, the overheating situation at the return conduit of medium-temperature evaporator can be effectively controlled. Furthermore, the model can enhance the refrigeration speed, and improve the problems of accumulation of refrigerator oil as well as the shutdown and instability of pump appeared in traditional evaporating pressure regulating valve. After making analysis and comparison under the operation of Model-C, the COP of dual-temperature refrigerator is found improved by around 21.7%. When experimental analysis and comparison are made under the operation of Model-D, it is found that air-cooled liquid-gas heat exchanger can effectively provide better overcooling degree, and this device can improve the exhaust of compressor and excessively high temperature of machine shell. Eventually, the overall COP can be effectively improved by around 29.5%.[SDGs]SDG7conference paper10.1117/12.8854852-s2.0-79952748116https://www.scopus.com/inward/record.uri?eid=2-s2.0-79952748116&doi=10.1117%2f12.885485&partnerID=40&md5=3899690dacf50fe7852665066148d20a