Title of article :
Solar radiation concentration features in Linear Fresnel Reflector arrays
Author/Authors :
Abbas، نويسنده , , R. and Montes، نويسنده , , M.J. and Piera، نويسنده , , M. and Martيnez-Val، نويسنده , , J.M.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
12
From page :
133
To page :
144
Abstract :
This paper is aimed at characterizing the concentration process for LFRs, and to analyze the use of different optical designs, including circular-cylindrical and parabolic-cylindrical mirrors with different reference positions. A new approach to analyze and optimize the performance of Fresnel arrays is presented, which is based on a newly formulated optical property that can be used to evaluate the drift of the reflected sunbeams from the mirrors as they rotate to follow the sun. This new optical-geometric property sets upper bounds for the deviation of the reflected sunbeams, in relation to trajectories of the reference situation. It is observed that the maximum deviation depends on the width of the mirror, which must be limited for maximizing the optical efficiency. From this theory an optical design process is suggested to minimize such lateral drifts and to minimize the concentration factor variation along the day. A new mirror layout is defined for keeping a constant value of the radiation impinging onto the receiver from effective sunrise to effective sunset.
Keywords :
Optical geometry , Rotating mirrors , Radiation concentration , Linear Fresnel Reflectors , Mirrors layout
Journal title :
Energy Conversion and Management
Serial Year :
2012
Journal title :
Energy Conversion and Management
Record number :
2335857
Link To Document :
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