Chapter 3 Calculation of ground solar radiation Qa(w/m'day) (24/m)o/p2)( Qsinφ·sinS+cosφ·cosS·sino) 0。= arccos(- ttgδ) l/p2=1.00011+0.03422lcoo+0.00128sino +0.000719c0s20+0.000077sin260 8=(0.006918-0.399912c0s00+0.070257sino 0.006758c0s260+0.000907sin200-0.002697c0s390 +0.000148sin30o)(180/)( degree) 60=2π(dn-1)365(弧度) p=b/a 2021/2/22 Assessment of Climate/Change Impacts 18 of 76Chapter 3 2021/2/22 Assessment of Climate/Change Impacts 18 of 76 Calculation of Ground Solar Radiation Qa(W/m2 day) =(24/)(Io/ 2 )(o·sin ·sin + cos· cos·sino ) • o=arccos(-tgtg) • 1/ 2 = 1.00011+0.034221coso+0.00128sino +0.000719 cos2o+0.000077sin2o •  = (0.006918-0.399912coso+0.070257sino -0.006758cos2o+0.000907sin2o-0.002697cos3o +0.000148sin3o)(180/)（degree) • o = 2(dn-1)/365 (弧度） • =b/a