= 5.12 A building in Madison has as part of the south surfaces a collector-storage wall with double glazing (KL = 0.0125 per sheet) and a black absorbing surface behind it that has an = 0.92 and an angular dependence as shown in Figure 4.11.1. Calculate the absorbed beam, diffuse, ground-reflected, and total radiation for the month of January. Assume that the ground reflectance averages 0.7 for the month. State any assumptions you make.