A COMPARISON OF MODELS TO ESTIMATE HOURLY DIRECT AND DIFFUSE IRRADIATION FROM HOURLY GLOBAL IRRADIATION

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  • SOGA Kazuhiro
    Graduate School of Engineering, Kagoshima University
  • AKASAKA Hiroshi
    Dept. of Architecture, Faculty of Engineering, Kagoshima University
  • NIMIYA Hideyo
    Dept. of Environmental Design, Faculty of Design, Nagaoka Institute of Design

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  • 全天日射量から直達日射量と天空日射量を推定する各種モデルの比較と評価
  • ゼン テンニッシャリョウ カラ チョクタツ ニッシャリョウ ト テンクウ ニッ

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Abstract

Considerable number of models for the estimation of hourly direct or diffuse irradiation have been developed both in our country and overseas countries. This report compares the models in order to find the most appropriate model applicable to the estimation of hourly direct irradiation and diffuse irradiation from hourly global irradiation observed at various sites in Japan. Two Japanese models and six foreign models are selected for the comparison. More than 60,000 hourly global and direct irradiation data observed at fourteen sites of JMA (Japan Meteorological Agency) are used for the comparison. It is found that five of the six foreign models give the better estimations than Japanese two models. Among the eight models, Root Mean Square Error (RMSE) of the Reindl model is the smallest at seven sites out of fourteen sites. Although RMSE of the five foreign models are similar, the estimation of the Reindl model is the best at the sites in high latitude. This indicates that Reindl model should be recommended for the application to various sites in Japan.

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