=+8-9.

A wall has an incident solar radiation of 300 Bu/(hr-ft-), an outside air temperature of 98 F, and an outside wind speed of 15 mph. The wall has a solar absorptivity of 0.6, a thermal emissivity of 0.9. negligible thermal mass, an outside-surface-to-inside-surface U-factor of 0.1 Bu/(hr-ffª-F).

and an inside surface temperature of 72 F. Determine the conduction heat flux