http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
황재호(J. H. Hwang),한인근(I. G. Han) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A heat pump, in the common thermodynamic sense, is a system in which refrigeration components (compressors, condensers, evaporators, and expansion devices) are used in such a manner as to take heat from a source (air, water, ground, etc.) and give it up to a heat sink (air, water, ground, etc.) that is at a higher temperature than the source. For many applications, the heat pump is designed in such a manner as to reverse the cooling and heating functions. With the value of energy today, the heat pump has become a more timely concept. The heat pump dryer has more merits than using hot wind, the sun for drying. First, relatively low electrical rates were necessary for the heat pump to compete favorably in terms of operating costs with fossil fuel fired furances. Second, the heat pump had to have satisfactory reliability and low maintenance requirement. Third, it gives a little environmental impacts. The results of this study are presented fundmental principles of heat pump, reliability of heat pump dryer.
탄화수소계 냉매용 열펌프의 성능특성에 관한 실험적 연구
이호생(H.S.Lee),차동안(D.A.Cha),김재돌(J.D.Kim),한인근(I.G.Han),윤정인(J.I.Yoon) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
Performance of a heat pump using hydrocarbon refrigerants are experimentally investigated. The working fluids for this study are R-290(propane), R-600a(iso-butane) as a natural refrigerant and HCFCs refrigerant R-22. The experimental apparatus is a conventional vapor compression type heat pump system. The performance of each refrigerant are obtained under several compressor speeds and the change temperature levels of secondary heat transfer fluids. The compressor work increased as the evaporating temperature increased and were a little higher using hydrocarbon refrigerant than HCFCs refrigerant. The increasement of refrigeration capacity with hydrocarbon refrigerant were better than R-22 according to the evaporating temperature. And COP increased linearly as evaporating temperature increased and showed the highest value when R-600a(iso-butane) was used as a working fluid. Experimental results showed some hydrocarbon refrigerants had better characteristics than R-22, that is, the natural refrigerants can be used as substitute for R-22.<br/> <br/>