Question

6. The radiation analysis of enclosures that consist of black surfaces is relatively easy due to the ……………….

A. presence of reflection

B. absence of reflection

C. presence of refraction

D. absence of refraction

Answer 1

Radiosity is sum of energy emitted as well as reflected from a surface.

However if the surface is black then Radiosity is equal to its Emissive power, since black body do not reflect any energy.

Thus in radiation Analysis it is easier if the enclosures consist of only black surface, since only emissivity needs to be calculated and not Reflection.

Thus answer to the MCQ is 'B. absence of reflection'

Finally,

The radiation analysis of enclosures that consist of black surfaces is relatively easy due to the absence of reflection.