Estimation of direct normal irradiance under various sky condi-tions in data sparse tropical ecological zones in Nigeria
作者: Samuel NwokoloJulie Ogbulezie
作者单位: 1University of Calabar.
刊名: International Journal of Advanced Astronomy, 2017, Vol.5 (2), pp.90-105
来源数据库: Science Publishing Corporation
DOI: 10.14419/ijaa.v5i2.8329
关键词: Decomposition ModelEquatorial LineDirect TransmittanceClearness IndexExtraterrestrial Solar Radiation.
原始语种摘要: In this study, models for estimating direct normal irradiance (Hb) under various sky conditions in data sparse tropical ecological zones in Nigeria were fitted. The evaluated values of clearness index indicate that the prevailing sky condition in the southern tropical zones is heavily overcast while the northern zones experience partly overcast under all sky conditions. From the analyses of the influences of clearness index on Hb, it was observed that higher values of Hb were recorded in the far north zone of Sahel savannah (FNZSS) of Sokoto while lower values were registered in the far south zone of mangrove swamp of Port Harcourt revealing an increasing trend from FSZMS to FNZSS due to the trends in cloudiness and associated atmospheric moisture with the movement through the Hadley cell...
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  • tropical 热带的
  • irradiance 辐照度
  • cloudiness 云量
  • latitude 纬度
  • sparse 稀疏的
  • trend 
  • clearness 清晰度
  • equatorial 赤道仪
  • conditions 条件式
  • various 千变万化的