Question

Heat is transferred to a heat engine from a furnace at a rate of $80MW$. If the rate of water heat rejection to a nearby river is $50MW$,
determine the thermal efficiency for this heat engine.

• A. 47.5 %
• B. 27.5%
• C. 37.5%
• D. None of the mentioned

Answer 1

The correct option is C 37.5%

Explanation: The thermal efficiency of heat engine = net work output/heat input
$=\frac{80-50}{80}=\frac{30}{80}=0.375=37.5\%$