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탄화수소계 냉매를 이용한 수냉식 히트점프의 성능특성에 관한 연구
전철호,이호생,김재돌,윤정인,Jun Chul-Ho,Lee Ho-Saeng,Kim Jae-Dol,Yoon Jung-ln 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.8
This study of the performance characteristics of natural refrigerants such as R-290 (propane), R-6OOa (iso-butane) and R-1270 (propylene) has investigated to compare with conventional HCFC's refrigerant R-22 for water-cooled heat pump system. The experimental apparatus has basic parts of cycle that uses the water as a heat source. The Performance of the water-cooled system using hydrocarbon refrigerants had been getting better than R-22 from start-up to the similar evaporating temperature after stabilizing system. Through the above it is possible that hydrocarbon refrigerants could be drop-in alternatives for R-22.
韓國 交通政策의 現在 및 未來課題 : 鐵道經營 政策方向을 中心으로 On the Perspective Policy in Railroad Business
全哲鎬 大田産業大學校 1994 한밭대학교 논문집 Vol.11 No.0102
This study focuses on the question why the present and future transportation market structure is needed. Especially in preparation for the new government-railway relationship and the expected necessity of intermediate/long-term planned active railway business in the coming era of rapid-transit electronic railway, the future comparative advantage of railway compared with other transportation(especially land transportation) must be examined in order to boost persistent and spontaneous railroad Policy and Propose reform measures curing the chronic railroad business deficit. As reference for the improvement of Korean railway business, particular railway business policies in other countries are reviewed. The result and the main point of railway business policy in this study are as follows: (ⅰ) to establish the partial responsibility system of investors and funds towards the public and profit sectors : (ⅱ) to propose the deregulation of railway rate system and the internal business policy(especially the improved railway parcel system and the reduced personal expenditures) as the means for the establishment of the profit-oriented system assuring the profit of railway business.
兼業銀行制度下에서의 流動性管理에 관한 諸學說 比較 硏究
全哲鎬 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.1
우리나라의 銀行들은 WTO體制下의 資本市場 開放化에 즈음하여 지금까지의 專門銀行制度에서 世界的 인 變形 趨勢인 兼業銀行制度로 本格的인 銀行經營의 多角化 過程을 目前에 두고 있으며, 이에 대비한 諸 銀行經營原則 中 가장 重視되는 部分이 流動性確保策이며, 또한 諸 學者들의 論爭 초점 대상이다. 流動性管理가 重視되는 이유는 銀行들이 수행해야 될 經營目的中 '預金者의 保護側面'外에도 近年에 强調되고 있는 '銀行의 收輦性確保라는 두가지 상반된 目的의 衝突로서 어떻게 이 兩者를 合 目的으로 調和를 導出해 낼 수 있는가의 結論을 내리l기 위해서는 兼業鑛行制度의 대표격인 獨逸을 中心으로 提示되고 있는 諸 學說의 代表的인 세 理論으로서 먼저 Hu¨bner가 19世紀 중반에 제창한 銀行經營의 流動性 確保原則인 Goldene Bankregel(銀行鐵則論), Wagner의 主唱論인 Bodensatztheorie(沈積論) 및 Stu¨tzel 敎授의 Maximalbelastungstheorie(最大負債論)등을 相互批判·分析하여 流動性管理에 客觀的인 指針을 마련하였음.
SiO₂ Wick을 使用한 Heat Pipe의 傳熱特性에 관한 硏究
全哲昊,徐海成 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1
Cu heat pipe with SiO₂ sintered wicks type capillary structure and distilled water as the working fluid was studied in the heat transfer rate range of 60W to 180W. Analysis resistances are considered in the pipe wall at the condenser and evaporator, in the fluid gap between pipe wall and capillary structure, at liquid vapor interface, and in the vapor region. The results are as follows. 1) Thermal resistance of wick had larger than any other thermal resistance and thermal resistance at pipe wall, interface, vapor region can usually be neglected 2) Increase the heat transfer rate and vapor temperature, temperature difference of evaporator were increased but temperature difference of vapor path were not changed.
전철호,장길홍 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2
The use of a combined cycle leads to an updating of power output, at the same time, increasing power plant efficiency. In this paper, the dissipation energy was calculated from two conventional and combined cycle processes, and then the efficiencies of many types of the combined cycle were compared. The efficiency of combined cycle power plant is evaluated by given data and its performance characteristics from the simulation. As a result, the total efficiency is increased as the compression ratio is increased.
실외 온도 변화에 따른HC계 공랭식 히트펌프 시스템의 성능 특성
전철호,이호생,김재돌,윤정인 대한설비공학회 2006 설비공학 논문집 Vol.18 No.3
The performance of an air to water vapor compression heat pump has been investigated experimentally. The main purpose of this study was to study the possibilities of using hydrocarbon refrigerants as a working fluid to replace R-22 for vapor compression heat pumps. Pure R-22 and R-290, R-600a, R-1270 were considered as working fluids. The performance of the system was characterized by compression shaft work, refrigeration capacity, pressure ratio, discharge temperature and COP. The experimental apparatus has basic parts of cycle that uses the air as a heat source. The experimental results show that refrigeration capacity of HC refrigerants is same or higher than that of R-22. On the other hand, compression shaft work of HC refrigerants is lower than that of R-22. Compression shaft work is lower than that of R-22. Come to the conclusion that, it is possible that hydrocarbon refrigerants could be drop-in alternatives for R-22.