# How do you calculate radiation heat transfer?

Jun 28, 2017

By Stefan–Boltzmann set of formulae.

#### Explanation:

The Stefan–Boltzmann law describes the power(energy) radiated from the ideally absorptive black body .

Transference of heat by emission and later absorption of electromagnetic radiation (via waves) between two bodies.

Q = σ *T^4*A

$$  or


Q= σA (T^4 1 -T^4 2)

................................................................................................................................

Q = heat transfer per unit time (W)

The S.-B. constant: σ = 5.6703 10^-8 $\left(\text{W/"m^2*K^4}\right)$

T = absolute temperature in Kelvin (K) :

T1= of the first object , T2= of the second object.

A = area of the emitting body$\left({m}^{2}\right)$