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

εx + εy)/(εx + εy - εx . εy)

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

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1.	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
A.	x + εy
B.	x . εy
C.	/εx + 1/εy
D.	εx + εy)/(εx + εy - εx . εy)
Answer» E.

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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

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