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Radiation heat transfer coefficient, surface to air

Radiation heat transfer coefficient from surface of PAC/GIL to the surrounding air.

Symbol
$h_{rad,sa}$
Unit
W/(K.m$^2$)
Formulae
$\sigma K_r \left(\theta_e+\theta_{abs}+\theta_{film}+\theta_{abs}\right) \left(\left(\theta_e+\theta_{abs}\right)^2+\left(\theta_{film}+\theta_{abs}\right)^2\right)$
Related
$K_r$
Radiation shape factor
$\sigma$
Stefan Boltzmann constant [W/m$^2$K$^4$]
$\theta_{abs}$
Absolute temperature [K]
$\theta_e$
External temperature of the object [°C]
$\theta_{film}$
Film temperature [°C]
Used in
$W_{rad,sa}$
Radiation heat transfer, surface to air [W/m]