1.

For infinite parallel planes with emissivities ε1 and ε2, the interchange factor for radiation from surface 1 to surface 2 is given by

A. \(\frac{{{\varepsilon _1}{\varepsilon _2}}}{{{\varepsilon _1} + {\varepsilon _2} - {\varepsilon _1}{\varepsilon _2}}}\)
B. \(\frac{1}{{{\varepsilon _1}}} + \frac{1}{{{\varepsilon _2}}}\)
C. ε1 + ε2
D. ε1 ε2
Answer» B. \(\frac{1}{{{\varepsilon _1}}} + \frac{1}{{{\varepsilon _2}}}\)


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