SCIENTIA GEOGRAPHICA SINICA ›› 1989, Vol. 9 ›› Issue (1): 43-50,95.doi: 10.13249/j.cnki.sgs.1989.01.43

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FEATURES OF SOLAR RADIATION ON INCLINED SURFACES IN CHANGCHUN

Zhu Zhihui   

  1. Institute of Geography, Academia Sinica, and State Planning Commission of the People’s Republic of China, Beijing
  • Online:1989-01-20 Published:1989-01-20

Abstract: Orientational characteristics and seasonal variation of monthly average daily and annual sums of extraterrestrial,direct,global radiation and sunshine duration on various inclined surfaces in Changchun.Jilin Province are computed and analyzed,The good azimuthes,the Optimum inclination angles suitable for solar energy utilization and the relevant direct and global radiation on these inclined surfaces are discussed and determined. The computative results indicate that the various radiations on non-horizontal surfaces in Changchun vary remarkably with slope and orientation.The optimum inclination angles fixed annually facing south is 45癴or direct radiation and 43癴or global radiation,The annual sums of direct and global radiation on the optimum inclined surfaces are 37% and 25% more than those on horizontal surface respectively.When south-facing optimum slopes are fixed for each month,the annual sums of monthly direct and global radiation on the optimum inclined surfaces can reach 149% and 135% of those on horizontal surface respectively.