Project ForgeHeat Transfer
Convection & Radiation
GATE 2017
Medium
The heat loss from a fin is 6 W. The effectiveness and efficiency of the fin are 3 and 0.75, respectively. The heat loss (in W) from the fin, keeping the entire fin surface at base temperature, is __________.
8 W(± 0.2 accepted)
Explanation
Fin efficiency η = Q_actual / Q_max, where Q_max is the heat loss if the entire fin surface were at base temperature. Q_max = Q_actual/η = 6/0.75 = 8 W. (The given effectiveness value is extra information, not needed for this particular ratio.)
Source: GATE ME 2017 Session 2 (ME-2) (2017)
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