The interchange factor for radiation heat transfer from surface 'x' to surface '

Question

The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by

Options:

A . Εx + εy

B . Εx . εy

C . 1/εx + 1/εy

D . (εx + εy)/(εx + εy - εx . εy)

Answer: Option D

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