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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
10.4.3.1 Higher and lower calorific values
The enthalpy of reaction of CH
4
derived above (50,178 kJ/kg) is the negative of the lower calorific
value (LCV) because it is based on gaseous water (H
2
O(g)) in the products. If the water in the products
(exhaust) was condensed to a liquid then extra energy could be released by the process. In this case the
enthalpy of reaction would be
Q
p
25
¼ðDH
f
Þ
CO
2
þ 2ðDH
f
Þ
H
2
OðlÞ
ðDH
f
Þ
CH
4
¼890225 kJ
=
kmol
This gives an enthalpy of reaction per kilogram of CH
4
of 55,639 kJ/kg. This is the negative of
the higher calorific value.
Normally the LCV, or lower internal energy or enthalpy of reaction, is used in engine calculations ...
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Publisher Resources

ISBN: 9780444633736