水平面全天日射量観測値よりの直達日射量の推定

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タイトル別名
  • THE ESTIMATION OF DIRECT SOLAR RADIATION FROM GLOBAL RADIATION
  • スイヘイメン ゼンテン ニッシャリョウ カンソクチ ヨリ ノ チョクタツ ニッ

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抄録

Data of solar radiation on the tilted surface are essential for designing buildings, air conditioning systems and solar utilizing equipments and can be estimated from the data of direct and diffuse components of global radiation. The purpose of this study is to find the relationship between global radiation and direct component of it to estimate solar radiation on the tilted surface only from global solar radiation in any sky conditions by analizing the data of global solar radiation and diffuse sky radiation obtained from TATENO Aerological Observatory throughout a year for examination of statistical characteristics. As the statistical analysis showed the possibilities of estimating the direct component only from global radiation, the regression model expressed by a combination of linear and cubic equations, in which direct component is expressed directly as the functions of global radiation, was presented. The standard errors on estimating the direct normal radiation by this model was 60kcal/m^2h for all of the annual data when sin h>0.3 (h : solar altitude). The effects of the errors from those of direct normal radiation in converting the global radiation into the radiation on tilted surface, which is more important in practical use than the direct radiation, were examined and it is considered that the regression equations presented in this study is useful in practical purpose.

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