Sol-Air Temperature
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5 Sol-Air Temperature

Sol-air temperature (Tsol) is the fictitious temperature of the outdoor air which, in the absence of radiative exchanges on the outer surface of the roof or wall, would give the same rate of heat transfer (Q) through the wall or roof as the actual combined heat transfer mechanism between the sun, the surface of the roof or wall, the outdoor air and the surroundings.

(13)

where hso = heat transfer coefficient of the outer surface

                Ts = temperature of outer surface

The heat gain due to the heat flow through the roof or wall is easily determined by using sol-air temperature as the outdoor air temperature excitation.