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박천완(ChunWan Park),이동규(DongGyu Lee),백종현(JongHyeon Peck),강채동(Chaedong Kang) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Gas diffusion layer(GDL) in PEMFC performs the discharge of water vapor smoothly. When GDL is left alone under a cold region, the freezing of the droplet or water net in GDL may occurs. The purpose of this work is to observe the cooling and freezing phenomenon of the droplet which contacts to the microporous surface under the various low temperature conditions. GDL was coated with waterproof material, which has three types of coating, 0, 40 and 60%. In order to observe the phenomenon, the water droplet and net on GDL were supercooled, frozen and crystalized using by low temperature thermostat under sub zero surrounding.
박천완(ChunWan Park),이동규(DongGyu Lee),백종현(JongHyeon Peck),강채동(Chaedong Kang) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.3
Gas diffusion layer(GDL) in PEMFC performs the discharge of water vapor smoothly. When GDL is revealed to cold environment, the freezing of the water droplet or water net in GDL occurs. The purpose of this work is to observe the cooling and freezing behavior of the water droplet which meets to the microporous surface and air under the various low temperature conditions. GDL was coated with waterproof material, which has three types of coating rate, 0, 40 and 60%. Water droplets in series of sizes on GDL were supercooled, frozen and crystalized orderly by circulating low temperature brine. The process of cooling was investigated with the temperature and the snapshot of the water droplet.
김형국(HyungKuk Kim),김경훈(KyungHun Kim),백종현(JongHyeon Peck),강채동(Chaedong Kang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
Phase change material(PCM) is applied actively to a supplementary heat source/sink in building HVAC and others.In order to show that thermal interference of adjoining two PCMs which made two rooms. Two PCMs, the high temperature PCM(HPCM, M.P: 78~79°C) and low temperature PCM(LPCM, M.P.:28~29°C) were utilized to the thermal energy storage material. PCMs were charged in two rooms of module, respectively. The arrangement of the cell was selected to BRINE-HTPCM-LTPCM order which was found to the worst heat transfer rate during melting/solidification from previous study. In this study, we predicted the heat transfer rate of HTP to that of HTP with perforated fin(FHTP) using CFD. We compared using CFD results and experimental results. At results, melting/solidification time of CFD results is long compared to the experimental results. But results of FHTP was shorter than results of HTP.
충전 순서가 다른 이종 PCM의 가열/냉각에 따른 열전달 특성
김형국(HyungKuk Kim),박천완(ChunWan Park),이동규(DongGyu Lee),백종현(JongHyeon Peck),최영석(Youngseok Choi),강채동(Chaedong Kang) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Phase change material(PCM) in solar heat thermal heat pump system is changeable to the utilizing temperature of the heat source. In this experiment, melting/solidification was performed to adjoining Two PCMs which is alternately neighbored each other in order to perform heating/cooling two thermal baths were independently used and the two PCMs, LTPCM(M.P.27.8°C) and HTPCM(M.P.78 °C) were set to heat transfer direction. As results, the PCM less than volume change should be positioned inner module in consideration of heat transfer area.
수직형 실린더 내 분리 충전된 이종 PCM의 융해/응고 실험
김경훈(KyoungHun Kim),김형국(Hyungkuk Kim),박천완(ChunWan Park),백종현(JongHyeon Peck),강채동(Chaedong Kang) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
태양열 열원 축열 시스템에서 상 변화물질(PCM)은 열원이용 온도에 따라 종류를 달리할 수 있다. 본 연구에서는 냉난방 겸용 시스템에의 적용을 위해 수직 방향 이중 실린더 내에 충전된 이종 PCM의 융해/응고 실험을 수행하였다. 이종 PCM은 수직 방향의 원형 모듈 안에 분리 충전되어 있고 각각의 PCM 충전부에 열전대를 장착하여 융해/응고 동안 온도를 측정하였다. PCM 각각의 상 변화점은 78 ℃, 27.8℃ 이다. 그 결과, 융해 시 이종 PCM의 상층부부터 원추형으로 융해가 진행되는 것과, 융해/응고 동안 상 변화에 의한 열 전달이 인접한 PCM에 의해 부분 간섭을 받아 진행되는 것이 확인되었다. Phase change material(PCM) in solar heat source heat pump system is changeable to the utilizing temperature of the heat source. In the experiment, melting/solidification of the two PCMs in a vertically cylindrical heat transfer module was investigated whether to use heat pump system. The two PCMs are stored but separated to wall and the temperature of the PCM is measured to thermocouples which are installed to PCM layer. The melting point of PCMs is 27.8℃ and 78 ℃, respectively. To the results, the PCM is conically melted from top of region. Moreover, due to phase change, some interference on heat transfer between the two PCMs is observed during melting/solidification.