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태양열 집열기용 히트파이프의 작동유체량 변화에 따른 열특성에 관한 실험적 연구
김병기(B.G. Kim),정경택(K.T. Chung),배찬효(C.H. Bae),서정세(J.S. Suh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Heat pipe can be utilized in many ways such as a heat transfer device in heat recovery system, heat exchanger and stabilizer temperature of electronics devices and solar collector. Especially, This study is aimed to research the thermal characteristics with the quantity of working fluid of grooved heat pipe for solar collector. The heat pipe used in this study has a rectangular grooved wick structure and the quantity of working fluid is charged in the heat pipe with 12㏄, 15㏄ and 18㏄, respectively. The effects of heat input, coolant temperature, tilt angle and charging quantity of heat pipe have been found. As a result from experiment, the thermal characteristics can be found according to the working fluid quantity of heat pipe for solar collector and the experimental results of charging quantity will be compared with those of analytical quantity.
모바일 전자장비 냉각용 Micro-CPL 의 재질 변화에 따른 열전달특성에 대한 해석
김병기(B.G. Kim),장환영(H.W. Jang),서정세(J.S. Suh),황건(G. Hwang),문석환(S.H. Moon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Using Micro Electro Mechanical Systems(MEMS) technologies, a micro-capillary pumped loop was designed, fabricated and tested to cool electronics or MEMS type devices. In this study, heat transfer characteristics of micro-capillary pumped loop is analyzed. Especially, this study was focused on heat transport capacity of micro-CPL with the materials of a cover and substrate. The micro-CPL is a bend type which has a grooved wick in evaporator region and a bend tube in condenser region separately. And a micro-CPL consists of two wafer with a cover and substrate. An analysis of heat transfer and pressure drop was conducted under various materials of a cover and substrate with silicon, glass and copper. In order to operate optimally micro-CPL, the optimal design of each part that evaporator, condenser, vapor and liquid line is necessary. In this study, a modified model was suggested with a optimal design of each part. The results of heat transfer characteristics will be discussed.
태양열 온수급탕 시스템의 부하패턴이 열성능에 미치는 영향에 관한 해석적 연구
김병기(B.G. Kim),장환영(H.Y. Jang),서정세(J.S. Suh) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
The performance of a solar water heater incorporating evacuated tubes was evaluated using a transient simulation program, TRNSYS. Simulations were performed for 60 degree of hot water load temperature and for 280 liter of daily hot water volumes and three 400liter of storage tank volumes. Three patterns of daily hot water consumption profile were used in the present study(morning, lunch and evening). The results show that the increase in solar fraction depends on the load profile, as well as the collector efficiency coefficient. Hot water draw profile has a large effect on the performance of the SDHWS, the morning load profile has the highest solar fraction. The annual solar fraction of the system, at the weather conditions of Jinju is approximately 84% at lunch load pattern, the 280㎏ of load volume, 400㎏ of tank volume and the 60 degree of load temperature.
TRNSYS를 이용한 태양열 온수 시스템의 열성능에 관한 해석적 연구
김병기(B.G. Kim),장환영(H.W. Jang),서정세(J.S. Suh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
A solar water heating system with auxiliary heater was simulated using the TRNSYS. Simulations were performed for three different hot water load temperature(60,70,80℃) and for two types of daily hot water volumes(140㎏, 280㎏) and three types of storage tank volumes(200,300,400㎏). Three patterns of daily hot water consumption profile were used in the present study(continuous, morning and evening). The results show that the increase in solar fraction depends on the load profile and volume, temperature setting, as well as the storage tank volume. Hot water draw profile and volume have a large effect on the performance of the SDHWS, the continuous profile has the highest solar fraction. The annual solar fraction of the system, at the weather conditions of Jinju is , at best, approximately 83% at continuous load pattern, the 140㎏ of load volume, 400㎏ of tank volume and the 60 degree of load temperature.