Chapter 3 Calculation of ground solar radiation F(X) function Q=Qi(a+bs or n) a+b=l or a+b=0.7 factors: Hours of sunshine(or percent of sunshine),s Cloud. n S+n>=1 ssessment of Climate/ Change Impact 23of76Chapter 3 Assessment of Climate/Change Impacts 23 of 76 Calculation of Ground Solar Radiation F(x) function: • Q=Qi(a+b·s or n) • a+b=1 or a+b=0.7 Factors: • Hours of sunshine (or percent of sunshine), s • Cloud, n • s+n>=1