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황우성(Whang Uoo Sung),조일식(Cho Yil Sik),양윤섭(Yang Yoon Sub) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
In CPC solar collectors convective and radiative heat losses are comparable. Radiative losses can be reduced by selective absorber coatings, but this will not improve the performance greatly unless convection losses are reduced at the same time. The proposed optical design would provide high efficiency comparable to a vacuum collector, since the design is constructed to suppress convection losses by placing the absorber facing downward, instead of facing up to the sky. The optical design of CPC is modified to provide a relatively uniform distribution of the concentrated radiation flux through the optics on the absorber surface that will enhance the thermal efficiency. Various absorber designs are suggested for efficient applications that lead to a selection of appropriate operating temperature ranges.
황우성(Whang Uoo Sung),황상문(Hwang Sang Moon),조성환(Cho Sung Hwan) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
The advantages in the use of low concentration ratio optics in photovoltaic applications are that the system can be a stationary and that a planar cell could be used as a concentrating cell, resulting in significant cost reductions of greater than 25% compared to a conventional planar PV module or system. Optics that are well-designed would provide a uniform distribution of concentrated radiation flux on the cell which enhance the fill factor of the cell, as well as preserving the life of the cells. A photovoltaic-thermal system is suggested as an application.
조일식(Cho Yil-sik),L. Bulat,황우성(Whang Uoo-Sung),양윤섭(Yang Yoon-Sub) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
In Compound Parabolic Concentration(CPC) solar collectors heat transfer as convective and radiative heat losses are comparable. Radiative losses can be reduced by selective absorber coatings, but this will not improve the performance greatly unless convection losses are reduced at the same time. The proposed optical design would provide high efficiency comparable to a vacuum collector, since the design is constructed to suppress convection losses by placing the absorber facing downward, instead of facing up to the sky. The optical design of CPC is modified to provide a relatively uniform distribution of the concentrated radiation flux through the optics on the absorber surface that will enhance the thermal efficiency. Various absorber designs are suggested for efficient applications that lead to a selection of appropriate operating temperature ranges.