Radiation of two surfaces
It is a thought experiment:
Imagine two bodies (A and B) of different surface area, made of the same material. Imagine all heat radiation of body A could be directed to body B and all radiation of Body B could be directed to body A.
After some time this would lead to a balance of radiation. Radiation from A to B would equal radiation from B to A.
As the bodies have different surface areas, this would lead to the interesting effekt, that the temperatures of these two bodies would be different.
What happens if you use these two different temperatures to power a heat engine? Is this a way to get entropy from enthalpy?
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"Time for a nobel prize?😊"
May be!
I will have to read more about radiation theory as it is not my area of expertise. :)