February 2015
Intermediate to advanced
578 pages
19h 27m
English
Content preview from Advanced Thermodynamics for Engineers, 2nd Edition
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FINITE TIME
(OR ENDOREVERSIBLE)
THERMODYNAMICS
6
6.1 GENERAL CONSIDERATIONS
The thermal efficiency of a Carnot cycle operating between high-temperature (T
H
) and low-
temperature (T
C
) reservoirs is given by
h
th
¼ 1
T
C
T
H
(6.1)
This cycle is extremely idealised. It requires an ideal, reversible heat engine (internally reversible)
but in addition the heat transfer from the reservoirs is also reversible (externally reversible). To achieve
external reversibility it is necessary that the temperature difference between the reservoirs and the
engine is infinitesimal (see Chapter 4, Section 4.9.1.1), which means that the heat exchanger surface
area must be very large ...
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