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Question

The
interchange factor for radiation heat transfer from surface 'x' to
surface 'y' in case of an infinite parallel planes with emis-sivities `epsi_x` & `epsi_y`s given by

 Theinterchange Factor For Radiation Heat Transfer From Surfa...
Options:
A .  `epsi_x + epsi_y`
B .  `epsi_x .epsi_y`
C .  `1/epsi_x + 1/epsi_y`
D .  `(epsi_x + epsi_y)/(epsi_x + epsi_y - epsi_x .epsi_y)`
Answer: Option D


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