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measurement and comparison of solar radiation estimation models ...

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so widely throughout China that they can be considered representative <strong>of</strong> different<br />

climatic regions <strong>of</strong> China. Two polynomial <strong>models</strong> have been developed to simulate<br />

clearness index <strong>and</strong> diffuse ratio at each station <strong>and</strong> also they proposed a trigonometric<br />

model in conjunction with a sine <strong>and</strong> cosine wave for estimating daily global <strong>solar</strong><br />

<strong>radiation</strong>. The statistical estimator <strong>of</strong> root mean square (RMSE) showed that the<br />

developed <strong>models</strong> are suitable for simulations <strong>of</strong> clearness index <strong>and</strong> diffuse ratio at<br />

most premium <strong>solar</strong> <strong>radiation</strong> stations in China.<br />

.<br />

14

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