Improvement of IEA Model with Power Section of Clearness Index
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概要
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It is necessary to calculate the tilted angle irradiation from horizontal global irradiation using solar energy. A separation of global irradiation into direct and diffuse components must be required. There are various models in the separation, IEA model have been widely used because of its simplicity. However, the accuracy of IEA model is not sufficient. Examining the correlativity of several parameters for the measured direct irradiation, the correlation coefficient of the 2nd and 3rd power of clearness index became much higher. So, we propose improved IEA model which is more accurate using power section of clearness index.