GATE 2017 ME (ME2) – Question 28
A fin loses 6 W of heat. Its effectiveness is 3 and efficiency is 0.75. The heat loss if the entire fin surface were at base temperature is ______ W.
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Correct answer: 7.9 to 8.1
Explanation
Fin efficiency is actual heat transfer divided by the heat transfer if all fin area were at base temperature. Thus ideal heat transfer is6/0.75=**8W**. Effectiveness3 compares against the bare base area and is not the denominator needed here.