Example 22
An inventor produces a motorcycle that delivers 90 hp
while burning fuel at the rate of 14.5 lbm/h. The heating
value of the fuel is 20,400 Btu/lbm and the maximum
engine temperature is 520°F. Take ambient air
temperature to be 70°F. Is this cycle possible or
impossible? Support your result with calculations.
Solution:
The heat added to the engine is
5
Btu
lbm
Btu
20400
14.5
2.96 10
lbm
h
h
H
Q
⎛⎞
⎛
⎞
==
×
⎜⎟
⎜
⎟
⎝⎠
⎝
⎠
±
The claimed efficiency of the motorcycle is
5
90hp
0.774
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This homework help was uploaded on 04/07/2008 for the course MANE 4010 taught by Professor Kaminski during the Spring '08 term at Rensselaer Polytechnic Institute.
 Spring '08
 Kaminski

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