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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.
고속버스의 유선형 설계가 연비향상 및 이산화탄소 저감에 미치는 영향에 관한 수치해석 연구
서인호(I.H. Seo),김철호(C.H. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Buses have been used as one of the main and important public transportation facilities in society. Especially for high-speed coaches, they have been played and will play an important role in a long-distance transportation system between city-to-city and state-to-state in future. In general, the size of engine installed in a high-speed express coach is on the range of 12~16 liters in displacement volume and 800~1,200 kw in brake power. Its fuel consumption is surprisingly high and the rate is on 2.5~3.5 km/liter in its cruising speed(110km/h) on a high speed. In this research, a streamlined design of a high-speed, long-distance coach was studied to understand its effect on the fuel consumption and carbon dioxide reduction compared to its original configuration. For this, one of popular models of high-speed express bus was selected and compared its aerodynamic performance to its streamline designed models. For a streamlined design of the model bus, a frontal configuration of the vehicle was modified to reduce the stagnation pressure drag and an IDRD (induced drag reduction device) was installed to reduce the induced drag at the rear-side of the bus. Five models of streamlined designed vehicle were developed with the combination of the modified frontal area and rear spoiler. From the study, it was found that 27.4% of the total drag of the original bus (Model-0) was reduced on the model-3 that is equivalent to 17.3kW of an engine brake power at 120km/h in speed. The annual economical effect is the reductions in about 14,610 liters of fuel and 41.2 tons of CO2 per year by each car at the assumed operating condition.