A Comparative Study of Some Regression Models to Estimate the Global Solar Radiation on a Horizontal Surface from Sunshine Duration and Meteorological Parameters for Ghardaïa Site, Algeria

<table class="table-group" id="tab8"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td align="left">Measured value</td><td align="center">Model</td><td align="center">Estimated values</td><td align="center"><svg height="7.9499998" id="M60" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 7.1624999 7.9499998" width="7.1624999" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path d="M391 364q0 -28 -20.5 -53.5t-50 -43.5t-70 -34t-73.5 -25t-68 -17v-29q0 -48 20 -81t65 -33q73 0 157 76l16 -23q-107 -113 -221 -113q-21 0 -40.5 6.5t-39 22t-31.5 47t-12 75.5q0 69 33.5 139.5t95.5 114.5q77 55 143 55q42 0 69 -24.5t27 -59.5zM313 350
q0 26 -14.5 40.5t-37.5 14.5q-32 0 -44 -7q-82 -46 -104 -175q200 49 200 127z" id="x1D452"></path></g>
</svg> (%)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td align="left"> </td><td align="center">Linear</td><td align="center">5852.45</td><td align="center">0.316</td></tr><tr><td align="left"> </td><td align="center">Quadratic</td><td align="center">5857.43</td><td align="center">0.231</td></tr><tr><td align="left"> </td><td align="center">Logarithmic</td><td align="center">6108.62</td><td align="center">−4.047</td></tr><tr><td align="left">5871</td><td align="center">Exponential</td><td align="center">5847.95</td><td align="center">0.393</td></tr><tr><td align="left"> </td><td align="center">Abdalla</td><td align="center">5846.03</td><td align="center">0.425</td></tr><tr><td align="left"> </td><td align="center">Ojosu et al.</td><td align="center">5833.50</td><td align="center">0.639</td></tr><tr><td align="left"> </td><td align="center">Hargreaves et al.</td><td align="center">5887.97</td><td align="center">−0.289</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Comparison between measured and estimated annual global solar radiation (Wh/m<sup>2</sup>).

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Table 8

Table 8: A Comparative Study of Some Regression Models to Estimate the Global Solar Radiation on a Horizontal Surface from Sunshine Duration and Meteorological Parameters for Ghardaïa Site, Algeria 

Table 8 | A Comparative Study of Some Regression Models to Estimate the Global Solar Radiation on a Horizontal Surface from Sunshine Duration and Meteorological Parameters for Ghardaïa Site, Algeria 