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이지수 ( Ji Su Lee ),황현창 ( Hyun Chang Hwang ),이석호 ( Soek Ho Rhi ),이계복 ( Kye Bock Lee ) 충북대학교 산업과학기술연구소 2014 산업과학기술연구 논문집 Vol.28 No.1
Generally, any power generation system dissipating heat should be cooled by heat exchanging system such as fan, water-cooled path. In the present study, the heat exchanger for water cooling system in extreme environment was designed by numerical analysis. To design the optimum cooling system for very small temperature difference between hot source temperature and cold source temperature, theoretical calculation based on heat exchanger design theory were carried out. The heat exchanging chamber of 300mm×300mm×600mm including heat exchanger was considered to transmit the beat from maximum 60℃ hot side water to the coolant which is supplied in the range of 45`55℃ by Korea district heating corporation. Pipe diameter at hot side is 13.82mm and the cooling water flows into heat exchanger at the speed of 8.33 kg/s. Also hot side water circulating in the loop to cool power generation module flows in 1.67kg/s. In the present study, the required pipe length at hot side in coil type heat exchanger is optimized to about 26m based on theoretical calculation. In order to reduce the hot side temperature as much as 005℃, the additional pipe length of 15`20 to should be added. The fin type of heat exchanger must be considered with various geometries such as fin height, diameter, and thickness etc. And the fin design also should be considered carefully in terms of pressure drop across the heat exchanger.
태양광자동차의 발전모듈 온도 특성에 따른 최적 설계 기술
조민희 ( Min Hee Cho ),윤진원 ( Jin Won Yoon ),김건용 ( Gun Yong Kim ),허재원 ( Jae Won Huh ),이지수 ( Ji Soo Lee ),황현창 ( Hyun Chang Hwang ),이계복 ( Kye Bock Lee ),이석호 ( Soek Ho Rhi ) 충북대학교 산업과학기술연구소 2014 산업과학기술연구 논문집 Vol.28 No.2
Solar cars combine technologies typically used in the alternative energy and automotive industries. The design of a solar vehicle is severely limited by the amount of supplied solar energy input into the car. Currently, most solar cars have been built for the purpose of solar car racing or prototyping of solar energy usage. But in the present study, solar car designed with given solar cells was investigated in terms of daily irradiation, cell temperature and geometrical characteristics to improve the solar power generation and the driving efficiency. Mainly driving power of solar car depends on the performance of photovoltaic cells to convert sunlight into electricity. Unlike solar thermal energy which converts solar energy to heat for either household purposes, industrial purposes or to be converted to electricity, PV cells directly convert sunlight into electricity. Present solar car system``s power output was affected by module inclination and module temperature. Intensity of solar irradiation depending on time was also severely depending on the position of sun. Decreasing cell temperature leads to increase power generation.