Sol-air temperature
Sol-air temperature (Tsol-air) is a variable used to calculate cooling load of a building and determine the total heat gain through exterior surfaces. It is an improvement over: q A = h o ( T o − T s ) {\displaystyle {\frac {q}{A}}=h_{o}(T_{o}-T_{s})} Where: q {\displaystyle q} = rate of heat transfer [W] A {\displaystyle A} = heat transfer surface area [m2] h o {\displaystyle h_{o}} = heat transfer coefficient for radiation (long wave) and convection [W/m2K] T o {\displaystyle T_{o}} = outdoor surroundings' temperature [°C] T s {\displaystyle T_{s}} = outside surface temperature [°C] The above equation only takes into account the temperature differences and ignores two important parameters, being 1) solar radiative flux; and 2) infrared exchanges from the sky.