How do you calculate the radiative heat transfer coefficient?

1 Answer
May 22, 2016

Answer:

#h_(rad) = εσ(T_1^2 + T_2^2)(T_1 + T_2)#

Explanation:

The Stefan-Boltzman law relates the total amount of radiation emitted by an object to its temperature:
ε=σT4
where:
ε = total amount of radiation emitted by an object per square meter (Watts #m^(-2)#) (emissivity)
σ is a constant called the Stefan-Boltzman constant
= 5.67 x 10-8 (Watts #m^(-2)#)#K^(-4)#
T is the temperature of the object in K.

Radiative heat transfer is a comparison of an actual materials emissivity to a “black body”.

Radiative exchange between two gray, diffuse surfaces may be characterized by calculating the radiative heat transfer coefficient as shown below:
#h_(rad) = εσ(T_1^2 + T_2^2)(T_1 + T_2)#