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온도에 따른 집광형 태양전지의 성능에 관한 실험적 연구
신재혁(Shin Jae Hyuk),이승신(Yi Seung Shin),김상민(Kim Sang Min),부준홍(Boo Joon Hong) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
An experimental study was conducted to investigate the performance of a concentrating photovoltaic cell(CPV) against temperature. It is know that a high efficiency of a CPV can be achieved only with proper cell temperature as well as high concentration ratio (CR). This study is concerned with appropriate cooling condition for a liquid-convection cooler for the best performance of a specific CPV. A series of experiments was conducted in a range of cell temperatures as a result of varying cooling conditions, while the concentration ratio was 390 and the solar irradiation flux was higher than 900W/m2 in outdoor environment. The CPV had a planar dimension of 10 by 10mm. A Fresnel lens was used as a concentrator, of which the dimension was 221 mm(W) X 221 mm(L) X 3mm(t) and the transmissivity was known to be 0.8. The cooler was attached to the bottom side of the CPV and had a contact area of 21 mm(W) X 26 mm(L), which was identical to the size of the base plate of the CPV. The coolant temperature was controlled by an isothermal bath and the flow rate was controlled and measured by a flowmeter. The experimental results showed that the average of power efficiency of the CPV decreased from 28.6 % to 24.7 % as the cell temperature increased from 36℃ to 97℃. An appropriate cooling method of a CPV might increase the power conversion efficiency by about 4% for the same concentration ratio. Discussion is included from the viewpoint of the combined efficiency in a ddition to the power efficiency.