Question

A window receives 200 W of heat transfer at the inside surface of 20°C and transmits the 200 W from its outside surface at 2°C continuing to ambient air at – 5°C. Find the flux of entropy at all three surfaces and the window’* rate of entropy generation.

Answer 1

Flux of entropy :

If you want to include the generation in the outside air boundary layer where T changes from 2°C to the ambient –5°C then it is