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

47.5 %

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27.5%

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37.5%

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None of the mentioned

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Solution

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

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

The correct option is C 37.5%Explanation: The thermal efficiency of heat engine = net work output/heat input =80−5080=3080=0.375=37.5%

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

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