As shown in the Figure, a
composite material consists of a 0.9 cm layer of glass (pyrex) (A)
and a 0.4 cm layer of Teflon (B). The material separates two
gasses; one inside at Ti = 270°C with convective coefficient hi =
60 W/(m2 K) and one outside with convective coefficient ho = 28
W/(m2 K). It is know that the temperature of the exposed side of
the Teflon is Ts,o = 40°C. The two layers are not in perfect
contact, resulting to an unknown contact resistance. Determine the
magnitude of the contact resistance, in K/W, if it is known that
the total heat transfer through the 34 cm wide by 64 cm high
section is 1054.1 Watt. Use four decimal figures in your
answer.
Homework Answers
Principles of heat transfer by convection and conduction are utilised to solve the problem.
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Figure Q2(b) shows the composite wall of a freezing
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temperature on the outside concrete surface is 24 °C. The thermal
conductivity for corkboard is 0.04 W/m.K and for concrete is 0.8
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summatize the following info and break them into differeng key points. write them in yojr own words
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