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Electrical
Analogy - Heat Transfer
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[ Heat
Transfer Table of Contents]
A composite protective wall is formed of a 1
in. copper plate, a 1/8 in. layer of asbestos, and
a 2 in. layer of fiberglass. The thermal conductivities of
the materials in units of Btu/hr-ft-oF
are as follows: kCu =
240, kasb =
0.048, and kfib =
0.022. The overall temperature
difference across the wall is 500°F. Calculate the thermal
resistance of each layer
of the wall and the heat transfer rate per unit area (heat
flux) through the composite structure.
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