Stefan-Boltzmann law
Input(s)
\(\sigma\): Stefan Boltzmann Constant (1.713 E-9) \(\left(\mathrm{BTU} / \mathrm{ft}^{2} \mathrm{~h}^{\circ} \mathrm{R}^{4}\right)\)
\(T\): Temperature \(\left({ }^{\circ} \mathrm{F}\right)\)
\(\varepsilon\): Emissivity (fraction)
Output(s)
\(u_{i}\): Rate of Radiation Heat Transfer Per Unit Area \(\left(\mathrm{BTU} / \mathrm{h} \mathrm{ft}^{2}\right.\) )
Formula(s)
\[
\mathrm{u}_{\mathrm{i}}=\sigma * \varepsilon *(\mathrm{~T}+460)^{4}
\]
Reference(s)
Pratts, M. (1986). Thermal Recovery Monograph Vol. 7. Society of Petroleum Engineers, Houston, Page: 19.