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저온공조용 잠열 축열조의 열전달 특성에 관한 실험적 연구
서인호(I.H.Seo),고재윤(J.Y.Koh),이채문(C.M.Lee),임장순(C.S.Yim) 한국태양에너지학회 2000 한국태양에너지학회 논문집 Vol.20 No.3
In this study, the basic data which were required for development of LHSS(latent heat storage system) were experimentally obtained. Experiments were carried out under the following conditions. The initial temperatures of P.C.M. which were used by parameter is 5℃, 9℃ and 14℃. The conditions of working fluid are -6℃, -4℃, and 65ℓ/min.. The pure water of which the freezing point is 0℃ was filled in the system, and the Ethylene glycol(brine) was circulated through the 10 vertical tubes as a secondary fluid in order to cool the P.C.M. down. The inlet temperature of the secondary fluid and the initial temperature of the water were varied to investigate the effects of the important design parameters. The phenomenons of temperature conversion of P.C.M. were appeared for the conductive heat transfer and free convective heat transfer by buoyancy force in this storage unit system. In order to find the effective water circulation path, we obtained P.C.M. temperature distributions of 5 parts in the storage tank during freezing process.
김일겸(I.G.Kim),박상록(S.R.Park),고재윤(J.Y.Koh),김영중(Y.J.Kim),김준근(J.G.Kim),임장순(C.S.Yim) 한국태양에너지학회 1998 한국태양에너지학회 논문집 Vol.18 No.2
본 연구에서는 냉매 를 사용한 배치형 열펌프건조기(Batch type heat pump dryer)에 대하여 수치적 해석을 수행하였다. 즉 냉매의 과열도와 과냉도를 일정하게 유지하고 공기의 질량유량, 공기의 바이패스비(bypass ratio), 압축기의 회전속도, 건조기의 입구건구온도에 따른 건조기의 성능을 분석하였다. SMER에 대하여 수치해와 실험치를 비교한 결과 최대 10%이내에서 잘 일치 하였다. 또한 공기의 질량유량에 대하여 적정공기의 바이패스비가 존재하며, 건조기 입구온도가 35℃이고, 압축기 회전속도가 1360rpm일 때, 공기질량유량이 0.5kg/s에서는 공기의 바이패스비가 30%, 0.7kg/s에서는 공기의 바이패스비가 40%, 0.9kg/s와 1.1kg/s에서는 공기의 바이패스비가 50%에서 최대의 SMER이 나타났다. 그리고 압축기의 회전속도가 증가함에 따라 SMER은 감소지만 COP는 증가하고 건조기의 입구건구온도가 증가함에 따라 SMER과 COP는 감소하는 것으로 나타났다. This study carried out a numerical analysis on a heat pump assisted dryer using HFCl34a. Under the constant degree of superheat and that of subcooling, we analyzed the performance of heat pump assisted dryer with varying an air mass velocity, bypass air ratio, compressor speed and an inlet bulb temperature of dryer. Simulation results were compared with experimental results, so they were maximally agreed in the range of 10%. There was the proper bypass air ratio with varying an air mass velocity. As for the effect of Sl'v1ER having the inlet temperature 35°C and compressor speed 1360rpm, bypass air ratio was 30 % at the front velocity 0.5kg/s, 40% at the front velocity 0.7kg/s and 50% at the front velocity 0.9kg/s and 1.1kg/s. As the compressor speed was increased, SMER decreased and COP increased. As the inlet bulb temperature was increased. SMER and COP decreased.