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심층수 이용 열교환기 개발을 위한 열교환기 재질과 열교환 성능에 관한 연구
이창경(C.K.Lee),권정태(J.T.Kwon),권영철(Y.C.Kwon),허철(C.Huh) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.11
본 논문은 심층수 이용 열교환기 개발에 있어서 열교환기의 재질인 티타늄, 알루미늄, 스테인리스, 철, 구리 및 코팅된 알루미늄관 등을 이용하여 이중관 열교환 실험장치를 구성하고 그 열교환 성능을 실험하였다. 기존 심층수 이용 열교환기는 대부분티타늄 금속으로 이루어져 있다. 티타늄의 재질은 해양 심층수에 적합하나 고가의 금속이다. 이런 티타늄 금속을 대체할 금속으로 알루미늄, 스테인리스, 철, 구리와 코팅된 알루미늄 관을 실험함으로써 기존 티타늄 열교환기에 비해 비용을 많이 줄일 수 있는 반면 열교환 성능도 크게 뒤지지 않은 재질을 고찰해 보았다. 해양 심층수 이용열교환기의 적합한 금속은 부식에 있어서 강해야 하며 열전달 또한 좋아야 한다. 이러한 열교환기 재질 및 열전달 성능에 관한 기초연구를 위해서 이중관 열교환기를 설계하고 제작하였다. 다양한 재질의 이중관 열교환기에서 열교환 성능을 실험적으로 구하였다. 또한 EES(Engineering Equation Solver) 프로그램을 사용하여 각 관들의 열전달률을 해석 하고 이중관 열교환 실험 결과와 비교하였다. This paper, for the development of heat exchangers using deep sea water, presented the design method of heat exchangers, experimentation, and analysis of double-tube heat exchanger performances. The heat exchangers were made of titanium, aluminum, stainless steel, iron, copper and aluminum with coating pipes. Most frequently used heat exchanger for using deep sea water is composed of titanium metal. Titanium is suitable for deep sea water because of it"s anti-corrosion property, while it is quite expensive. We considered some metals which can reduce the initial cost compared to titanium heat exchanger by testing the heat exchange performances. For these experiments, we designed double-tube heat exchangers and tested their heat transfer performances. Also we calculated heat transfer rate of each pipe by using EES (Engineering Equation Solver) program and compared it with the corresponding experimental result.
환경변화에 따른 핀-관, PF 열교환기 적용 공조기 성능 특성 실험 연구
박경만(K.M. Park),엄유식(U.S. Um),권영철(Y.C. Kwon),이상재(S.J. Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In the present study, performance characteristics on environment change of A/C applied fin-tube and PF heat exchangers were experimentally investigated. Capacity and COP changing an outlet air velocity, an indoor/outdoor temperature and a relative humidity were obtained. Air-enthalpy calorimeter was used. As the air velocity, indoor temperature and relative humidity increase, capacity and COP increase. PF A/C has smaller refrigerant weight than the fin-tube A/C. The performance of PF-2 A/C with the squarer fin was more excellent than that of PF-1 A/C with the triangler fin.
엄유식(Y.S. Um),서동남(D.N. Seo),박경만(K.M. Park),이상재(S.J. Lee),김대훈(D.H. Kim),권영철(Y.C. Kwon) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
In the present study, the air-side heat transfer and pressure drop characteristics of the fin-tube and PF heat exchangers have been experimentally investigated under the cooling standard condition. Fin type of PF heat exchanger is a triangler and squarer form. The experimental data of the slit fin-tube and two kinds of PF heat exchangers are measured using the air-enthalpy calorimeter and the constant temperature water bath. As the inlet air velocity increases, the heat transfer rate and pressure drop of the heat exchanger increased. The heat transfer rate and pressure drop of PF-2 heat exchanger of the squarer fin is larger than that of PF-1 heat exchanger of the triangler fin. As the inlet air temperature increases, the heat transfer rate decreases and the pressure drop is nearly uniform.
용량가변 시스템 에어컨의 냉방운전 시압축기 토출온도 상관식
이상헌(S.H. Lee),권영철(Y.C. Kwon),장근선(K.S. Chang),김대훈(D.H. Kim),허삼행(S.H. Heo),윤백(B. Youn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An experimental study has been performed to investigate the correlation on compressor discharge temperature of capacity modulated system A/C in cooling mode. Indoor and outdoor temperatures, the cooling capacity, compressor discharge temperature and loading time are measured by the psychrometric calorimeter. The system is controlled by applying the scroll compressor, which is operated by PWM valve and loading duty. With decreasing outdoor temperature, the cooling capacity increases. But, with decreasing indoor temperature, it decreases. Also, with increasing loading duty the cooling capacity increases. According to the increase in outdoor temperature and loading duty, compressor discharge temperature increases. From these experimental data, the correlation on compressor discharge temperature is proposed. It is expressed as a function of indoor temperature, outdoor temperature, and loading duty. The correlation obtained from the present study is agreed with the experimental data within 3℃.