Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Question
Chapter 1, Problem 1.58P
(a)
To determine
The electric power produced by a stack and to find the total thermal energy generated by stack for bipolar plate thickness in the range
(b)
To determine
The surface temperature and explains whether the stack needed to be internally heated or cooled to operate at the optimal internal temperature of
(c)
To determine
Explain the method to increase or decrease the operating temperature of bipolar plate thickness, design changes that promote a more uniform temperature distribution within the stack, explain how the answer is affected by the external and surrounding temperature, identify the membrane in the stack that fail due to high operating temperature.
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at atmospheric pressure, water melts as the temperature increases from 270K to 280K because
a. the chemical potential of the liquid is lower than that of the gas
b. the liquid and solid form a eutectic mixture
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12. A piece of copper wire is initially at 150 C. We now expose this wire to air at
38 C. Find a) the rate of heat transfer at the moment of exposure and b) compare
this rate of heat transfer to the rate of heat transfer from thermal radiation at the
moment of exposure.
Data: For copper at 150 C; k = 374 W/m-K, c = 381 J/kg-K, p = 8938 kg/m², ɛ
= 0.8. The heat transfer coefficient is h = 5 W/m²-K. [Ans.: Initial heat loss is
64% due to radiation and 36% due to convection].
This Concepts revolves around thermodynamics and this practice example may need a PV diagram
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Chapter 1 Solutions
Fundamentals of Heat and Mass Transfer
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