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Advanced Thermodynamics for Engineers, 2nd Edition
book

Advanced Thermodynamics for Engineers, 2nd Edition

by Ali Turan, D. Winterbone
February 2015
Intermediate to advanced content levelIntermediate to advanced
578 pages
19h 27m
English
Butterworth-Heinemann
Content preview from Advanced Thermodynamics for Engineers, 2nd Edition
16.5 FRICTION IN RECIPROCATING ENGINES
The basic equation defining the variation of thermal efficiency of an engine operating on the Otto cycle
was derived in Chapter 3, and is from Eqn 3.16
h
th
¼ 1
1
r
ðk1Þ
This thermal efficiency is the indicated thermal efficiency. The more important parameter for the
engine user is brake thermal efficiency, because this relates the energy input in the fuel to the power
output at the crankshaft. The brake thermal efficiency is defined as
h
b
¼ h
th
h
m
(16.17)
where h
m
is the mechanical efficiency. The mechanical efficiency accounts for all the losses between
the fuel input and the power output, and includes friction, effects of
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Publisher Resources

ISBN: 9780444633736