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천원기,강상훈 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.2
Plate heat exchangers have less limitation on space and weight because they can be small with higher heat transfer coefficients rather than air-cooled, shell-tube, and plate-fin heat exchangers. And, heat exchange can be efficiently performed even though the temperature difference of sea-water is small. They also have expense reduction effect in case that we use expensive materials for corrosion prevention and have merits of cleaning and changing design easily. So, plate heat exchangers are more suitable for evaporator and condenser of OTEC system.
Thermal Analysis of Passive Solar Schoolroom Designs
천원기 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.2
This paper studies thermal performances of three types of schoolroom configurations designed to maximize the use of solar energy. Each design contains certain distinctive haracteristics in trapping and utilization of solar energy. To carry out the thermal analysis here numerical simulations as well as on-thesite measurements are peformed for a certain period of time (unsteady state). The results are then extended to predict the long term average thermal performance of each configuration during a typical wintry season. Suggestions are further made to improve its overall environmental conditions when designing a schoolroom with passive solar concepts.
Heat Transfer Characteristics of a Miniature Two-Phase Closed Annular Thermosyphon
천원기,이영수 濟州大學校 産業技術硏究所 1995 산업기술연구소논문집 Vol.6 No.-
An experimental study on the heat transfer performance of a miniature two-phase closed thermosyphon is described. Water, ethanol and methanol have been tested as the working fluids. A visualization regarding the motion of liquid with boiling, scattering of liquid drops and condensation of vapor has been made to clarify the heat transfer mechanism in the miniature thermosyphon. Out of many possible controlling variables, the effects of (a) the insert thickness (b) the ratio of heated-length to cooled-length and (c) the heat flux, were investigated.
천원기,이경진 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.1
This study has been carried out to develop thermal diode Smart Modules. which are capable of adjusting the direction of heat flow and solar absorption. It can be used for space heating in winter and reduce the cooling load of buildings in summer. The major feature of this system is the application of bidirectional thermo-diode which allows a change in the forward bias heat transfer direction. Manufacturing processes and installation of the system were designed to facilitate the "modular" production of the system. A master module equipped with an electronic controller determines the operational mode of the system.
천원기,강상훈 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.2
Plate heat exchangers have less limitation on space and weight because they can be small with higher heat transfer coefficients rather than air-cooled. shell-tube. and plate-fin heat exchangers. And, heat exchange can be efficiently performed even though the temperature difference of sea-water is small. They also have expense reduction effect in case that we use expensive materials for corrosion prevention and have merits of cleaning and changing design easily. So. plate heat exchangers are more suitable for evaporator and condenser of OTEC system.
천원기,강상훈 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2
This thesis is to find the optimum way to increase the use of the currently widely vacuum tube solar collector through the analysis of its thermal efficiency and various types and features. The vacuum tube solar collector is divided into two classes depending on its design. One is equipped with a metal fin in a vacuum tube for collecting the solar heat, while the other uses an inner tube to collect the heat, in effect doubling the vacuum tube. Of course, both maximize the collection of solar heat but they differ in the way the heat is transferred to its point of use. In the first case, the collecting of the solar energy can derive the thermal analysis through the use of the theory of heat collection such as the flat-type collector's fin efficiency. The representative example of this is the type of vacuum tube with a heat pipe and attached.
An Experimental Study on the Utilization of Heat Pipes for Solar Water Heaters
천원기,강용혁,전명석,곽희열,Chun, Won-Gee,Kang, Yong-Heack,Jeon, Myung-Seok,Kwak, Hee-Youl 한국태양에너지학회 1995 한국태양에너지학회 논문집 Vol.15 No.2
본 논문은 히이트 파이프를 이용한 태양열 온수 급탕 시스템의 제작 및 그 열성능에 관한 내용이다. 국내 기후에 적합한 모델을 도출하기 위하여 본 연구에서는 여러번에 기초실증 실험을 수행하였다. 히이트 파이프는 구리로 제작하였으며 증발부, 단열부 및 응축부의 길이는 각각 1700mm, 100mm, 그리고 200mm이다. 증발부는, 특히 효율적인 집열을 위하여 얇은 구리로 만든 핀(fin)을 부착하였다. 연구결과를 살펴보면 작동 유체의 종류, 윅(wick)의 유무, 표면 처리 정도 그리고 그 밖의 여러 설계인자에 따라 히이트 파이프를 이용한 태양열 온수 급탕 시스템의 열성능이 적지 않은 영향을 받을 수 있음을 나타내고 있다. This paper reports the performance of solar domestic hot water systems manufactured with heat pipes. A series of tests were conducted on a number of systems to elicit the most suitable configuration of the system for possible commercialization in Korea. The heat pipe is made with a copper tube and the respective length of the evaporator, adiabatic, and condenser sections are 1700mm, 100mm and 200mm. The evaportor section is finned with a copper plate to increase solar input for its proper operation as a heat pipe. Results show quite an interesting performance data stemming from the difference in working fluids, presence of wick, and other various design parameters associated with the collection and utilization of solar energy.