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A Study on the Solar Radiation Estimation of 16 Areas in Korea Using Cloud Cover  

Jo, Dok-Ki (Korea Institute of Energy Research)
Kang, Young-Heack (Korea Institute of Energy Research)
Publication Information
Journal of the Korean Solar Energy Society / v.30, no.4, 2010 , pp. 15-21 More about this Journal
Abstract
Radiation data are the best source of information for estimating average incident radiation. Lacking this or data from nearby locations of similar climate, it is possible to use empirical relation ships to estimate radiation from days of cloudiness. It is necessary to estimate the regression coefficients in order to predict the daily global radiation on a horizontal surface. There fore many different equations have proposed to evaluate them for certain areas. In this work a new correlation has been made to predict the solar radiation for 16 different areas over Korea by estimating the regression coefficients taking into account cloud cover. Particularly, the straight line regression model proposed shows reliable results for estimating the global radiation on a horizontal surface with monthly average deviation of -0.26 to +0.53% and each station annual average deviation of -1.61 to +1.7% from measured values.
Keywords
Solar Radiation; Global Radiation on Horizontal Surface; Cloud Cover; Straight Line Regression Model;
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