| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 102 === The cascade refrigeration systems are widely applied in Taiwan, for use in air conditioning, refrigeration and food processing, pharmaceuticals, chemicals, machinery, etc. More attention recently, So this thesis refrigeration components easily available in the market to buy the dual refrigeration system developed for conducted to explore various expansion valve of the refrigerant flow. The system of high and low temperature circulation system individually in four A, B, C and D expansion valve testing, in order to best binary refrigerating system expansion valve and the coefficient of performance. Results in a high temperature due to the circulatory system A, B, C the expansion valve of the refrigerant flow rate is too small, resulting in low temperature startup cycle, temperature cycle system can,t be stabilized at the intercooler below -30 ℃, the system also due to temperature cycling and A the flow of refrigerant expansion valve B is too small, the evaporator can,t reach -80 ℃, and start C expansion valve of the evaporator inlet temperature difference is too large, said it could not achieve a good cooling effect, this thesis high binary refrigeration system, hypothermic circulatory system are available starting D expansion valve coefficient of 0.45 for the best performance.
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