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Thermal Insulation Calculation Problems

The document contains two practice problems related to heat transfer through walls. The first problem asks to calculate the required thickness of insulation for a wall with a 2 cm thickness and specified thermal conductivities so that the heat loss does not exceed 1830 W per square meter given inner and outer surface temperatures. The second problem asks to calculate the heat flow per unit area through a composite wall made of copper, asbestos, and fiberglass plates with a total temperature difference of 560°C across the wall.

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Nauman Khan
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130 views1 page

Thermal Insulation Calculation Problems

The document contains two practice problems related to heat transfer through walls. The first problem asks to calculate the required thickness of insulation for a wall with a 2 cm thickness and specified thermal conductivities so that the heat loss does not exceed 1830 W per square meter given inner and outer surface temperatures. The second problem asks to calculate the heat flow per unit area through a composite wall made of copper, asbestos, and fiberglass plates with a total temperature difference of 560°C across the wall.

Uploaded by

Nauman Khan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Practice Problems

A wall 2 cm thick is to be constructed from material that has an


average thermal conductivity of 1.3 W/m C. The wall is to be
insulated with material having an average thermal conductivity of
0.35 W/m C, so that the heat loss per square meter will not
exceed 1830 W. Assuming that the inner and outer surface
temperatures of the insulated wall are 1300 and 30C, calculate the
thickness of insulation required

A composite wall is formed of a 2.5-cm copper plate, a 3.2-mm


layer of asbestos, and a 5-cm layer of fiberglass. The wall is
subjected to an overall temperature difference of 560C. Calculate
the heat flow per unit area through the composite structure.

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