=+8-10.

Compute the solar irradiation for a west-facing wall in Albuquerque, NM, for each hour of the day on July 21. Assume 0.4 percent outdoor design conditions. The wall has a solar absorptiv-

ity of 0.8. a thermal emissivity of 0.9, negligible thermal mass, an outside-surface-to-inside-

surface U-factor of 0.1 Btu/(hr-fr -- F), and an inside surface temperature of 72 F. Determine the conduction heat flux for each hour.