비추적집광형 집열기의 열손실 최적화에 관한 설계연구

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.