| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 88 === The main purpose of the research is to develop and implement a two-stage refrigerator with binary refrigerant mixtures,
including R134a and Helium. It requests low temperature and high cooling capacity for CPU cooling. We use electro-magnetic valves to adjust operating frequency and duty cycle of pulse tube inlet pressure to improve system performance and control cold-end temperature. The test method is searching the coolest temperature by varying operating condition, analyzing system response, and conducting system identification for controller design.
The experiment results show that the cold-end temperature reaches -70℃ at 0.5 Hz and 50% duty cycle, and 30W cooling capacity at -10℃. It demonstrates the refrigerator can be applied in CPU cooling.
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