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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
The voltage representing temperature T
H
is obtained due to the thermoelectric effect in the leads
when zero current flows, i.e. the potentiometer is balanced and J
I
¼ 0. At zero current, as previously
discussed, the electromotive force (emf) at the potentiometer (or DVM) equals the thermal emf
generated by the thermocouple.
From Eqn (20.48), the potential difference between each end of a wire of material M is related to
the temperature difference between the points by the following equation.
dεÞ
J
I
¼0
¼S
M
dT
J
I
¼0
(20.50)
where S
M
is the value of S* for material M.
Equation (20.50) can be applied to each wire in the system shown above, to give the following ...
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Publisher Resources

ISBN: 9780444633736