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

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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