Discussion :: Heat and Mass Transfer
- Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be
Answer : Option C
Explanation :
Q with shield/Q without shield = 1/n+1. N = no.of parallel shields. 0.25n+0.25 = 1. 0.25n = 0.75. n = 3.
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