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주우진(W. J. Joo),변종영(J. Y. Byun ),정태영 (T. Y. Jeong ),정석권 (S. K. Jeong ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
This paper investigates optimum operating conditions to develop automatic system with high energy efficiency of a seawater ice machine which has rotating drum installed an evaporator inside it. The coefficient of performance(COP) was used as an index to evaluate energy efficiency of the machine and it was calculated by two different manners. The opening angle(OA) of electronic expansion valve(EEV)/controlvariable,wasadjustedwithin 50-100% range to estimate the energy efficiency of the machine. At first, we checked COP and superheat according to the variation of OA of the EEV and rpm of the drum. Then we analyzed that how the variation of OA and rpm of the drum have influence on the COP and superheat. Finally, we confirmed that optimum OA of EEV was 85~90% range and the rpm variation of the drum did not have influence on the COP and superheat.
냉장고용 압축기의 무고장시험시간 주요 변수들의 영향 분석
변종영 (J. Y. Byun ),주우진 (W. J. Joo ),정태영 (T. Y. Jeong ),정영미 (Y. M. Jeong ),정석권 (S. K. Jeong ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
This paper evaluates the influences of variables related to accelerated life test time for a compressor in a refrigerator to guarantee qualification life of it. At first, some equations applied to real industrial field for evaluating accelerated life test time are introduced. Then we investigate influences of the variables of the equations effected on the test time. Finally, we analyze the times obtained from each equation which is necessary for testing the compressor. It will be expected that relations between each equation can be cleared. Therefore, we can conduct accelerated life test of a refrigerator"s compressor within optimized minimum test time.