Chapter-5 2 nd Law
Chapter-5 2 nd Law
Chapter-5 2 nd Law
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Example:<br />
Heat is transferred to a heat engine from a furnace at a rate of 75MW. If waste heat<br />
rejection to a nearby river is 48MW, determine the power output a<strong>nd</strong> the thermal<br />
efficiency for this heat engine.<br />
Furnace<br />
W<br />
net,out<br />
<br />
Q<br />
H Q<br />
L<br />
H<br />
Q ?<br />
75 MW<br />
<br />
(75 48)<br />
MW<br />
27 MW<br />
H.E.<br />
W net, out <br />
27 MW<br />
Q L 48 MW<br />
net,out<br />
th<br />
0. 36<br />
QH<br />
75 MW<br />
river<br />
W<br />
or 36%
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