A Study of Collector Slope Angles for Acquiring Maximum Solar Radiation for Various Periods

ABSTRACT:The objective of this research is to study the variation of optimum slope angles of collectors for seven regions in Korea, which are Seoul, Gangneung, Daejeon, Daegu, Gwangju, Busan and Jeju. The results for 2000～2007 are analyzed to see if adjustment of slope angles is necessary each year to receive maximum solar radiation. For an azimuth fixed solar collector, solar radiation of yearly optimized slope angle during May～Sept.(summer), Nov.～Mar.(winter) and the whole year are greater than the fixed slope angle by 0.03%, 0.02%, and 0.04%, respectively. For an azimuth tracking solar collector, solar radiation of yearly optimized slope angle during May～Sept.(summer), Nov.～Mar.(winter) and the whole year are greater than the fixed slope angle by 0.03%, 0.07%, and 0.04% respectively. It is unnecessary to adjust slope angles each year for both azimuth fixed and tracking collectors, since the gains are insignificant. Solar radiation of the azimuth tracking solar collector during May～Sept., Nov.～Mar. and the whole year are greater by 14.7%, 16.0%, and 19.2% than the azimuth fixed solar collector.Keywords:Solar radiation(일사량), Optimum slope angle(최적 경사 각도), Azimuth fixed(방위 고정식), Azimuth tracking(방위추적식), Reindl model(Reindl 모델)