=+8-11. Compute the solar irradiation for a south-facing wall in Boise, ID, for each hour of the day on July 21. Assume 0.4 percent outdoor design conditions. The wall has a solar absorptivity of 0.9.

a thermal emissivity of 0.9. negligible thermal mass, an outside-surface-to-inside-surface U-factor of 0.1 Btu/(hr-ft -- F), and an inside surface temperature of 72 F. Determine the con-

duction heat flux for each hour.