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오시덕,권용호,김태국 중앙대학교 기술과학연구소 1994 기술과학연구소 논문집 Vol.24 No.-
In this study a computer program has been developed to analyze the thermal and hydraulic performance of waste heat recovery boilers. Using the program developed in this study, the thermal and hydraulic performance data of a 3T/hr boiler are obtained for 100%, 75%, 50% and 25% loads. The results include the expected steam capacity, the local gas/water temperatures, and gas side pressure drop etc. For 100% load, comparison of the current results with those obtained from existing boiler code show fairly good agreements.
Electrohydrodynamic (EHD) Enhancement of Boiling Heat Transfer of R113+WT4% Ethanol
Oh Si-Doek,Kwak Ho-Young The Korean Society of Mechanical Engineers 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.5
Nucleate boiling heat transfer for refrigerants, R113, and R113+wt4% ethanol mixture, an azeotropic mixture under electric field was investigated experimentally in a single-tube shell/ tube heat exchanger. A special electrode configuration which provides a more uniform electric field that produces more higher voltage limit against the dielectric breakdown was used in this study. Experimental study has revealed that the electrical charge relaxation time is an important parameter for the boiling heat transfer enhancement under electric field. Up to 1210% enhancement of boiling heat transfer was obtained for R113+wt4% ethanol mixture which has the electrical charge relaxation time of 0.0053 sec whereas only 280% enhancement obtained for R113 which has relaxation time of 0.97 sec. With artificially machined boiling surface, more enhancement in the heat transfer coefficient in the azeotropic mixture was obtained.
Electrohydrodynamic (EHD) Enhancement of Boiling Heat Transfer of R113+WT4% Ethanol
Si-Doek Oh,Ho-Young Kwak 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.5
Nucleate boiling heat transfer for refrigerants, R113, and R113+wt4% ethanol mixture, an azeotropic mixture under electric field was investigated experimentally in a single-tube shell/tube heat exchanger. A special electrode configuration which provides a more uniform electric field that produces more higher voltage limit against the dielectric breakdown was used in this study. Experimental study has revealed that the electrical charge relaxation time is an important parameter for the boiling heat transfer enhancement under electric field. Up to 1210% enhancement of boiling heat transfer was obtained for R1l3+wt4% ethanol mixture which has the electrical charge relaxation time of 0.0053 sec whereas only 280% enhancement obtained for R1l3 which has relaxation time of 0.97 sec. With artificially machined boiling surface, more enhancement in the heat transfer coefficient in the azeotropic mixture was obtained.
한국과 일본에서의 가정용 PEMFC 시스템 경제성 분석
오시덕(Oh, Si-Doek),김기영(Kim, Ki-Young),서석호(Seo, Seok-Ho) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Fuel cell with high electric efficiency has many probabilities of commercial use. Especially, proton exchange membrane fuel cell (PEMFC) which is a low temperature fuel cell and has less influence on CO₂ concentration is considered the power generation system of small building and household. We calculated the optimal operational plans of 1 kW household PEMFC power system based on the daily electricity and heat demand patterns of Japan and Korea. Calculated results show that the economic feasibility of PEMFC power system is very sensitive to the cost policy of electricity and natural gas.
오시덕(Si-doek Oh),최원호(Won-ho Choi),이현주(Hyun-joo Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
According to recent price boom of oil, interesting about renewable energy reaches the climax. Especially wind energy is considered as the best solution for energy crisis because it's low cost of energy and abundant amount. In this paper, It is stated that wind turbine industrial and technical trend around world, and also domestic condition and trend is described including present developing state.