- Sol-air temperature
Sol-air temperature ("T"sol-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
:frac{q}{A} = h_o(T_o - T_s) where:h_o = heat transfer coefficient for radiation (long wave) and convection:T_o = outdoor surroundings' temperature:T_s = outside surface temperature
This equation only takes into account the temperature differences thus, ignoring solar radiative flux and infrared exchanges from the sky. The "T"sol-air was then introduced to accommodate these two parameters.
:T_mathrm{sol-air} = frac{T_o + (a cdot I - Delta Q_{ir})}{h_o}where:a = solar radiation absortivity of a surface:I = global solar irradiance:Delta Q_{ir} = infrared radiation transfer of sky temperature to surface
and is to be used in:frac{q}{A} = h_o(T_mathrm{sol-air} - T_s)
References
#Fundamentals volume of the "ASHRAE Handbook", ASHRAE, Inc., Atlanta, GA, USA, 2005
#"Heating and Cooling of Buildings", 2nd ed., Kreider, Curtiss, Rabl, McGraw-Hill, New York, USA, 2002ee also
*
HVAC
*ASHRAE
*Active solar
*Passive solar
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