A multilayer wall has a thermal resistance of 0.0058 ° C / W in the inner layer, 0.28 °C/W in the middle layer and 0.18 ° C/W in the outer layer. The total temperature difference across the wall is 70 ° C. a. Find the heat flow through the wall (per unit area). b. If we increase the heat resistance in the middle layer up to 0.48 ° C/W, then there will be a relative change in the heat flow if the temperature difference remains unchanged. Please answer as a percentage (%) of the heat flow in item a).

A multilayer wall has a thermal resistance of 0.0058 ° C / W in the inner layer, 0.28 °C/W in the middle layer and 0.18 ° C/W in the outer layer. The total temperature difference across the wall is 70 ° C. a. Find the heat flow through the wall (per unit area). b. If we increase the heat resistance in the middle layer up to 0.48 ° C/W, then there will be a relative change in the heat flow if the temperature difference remains unchanged. Please answer as a percentage (%) of the heat flow in item a).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

A multilayer wall has a thermal resistance of 0.0058 ° C/ W in the inner layer, 0.28 ° C/ W in
the middle layer and 0.18 ° C/ W in the outer layer. The total temperature difference across
the wall is 70 ° C.
a. Find the heat flow through the wall (per unit area).
b. If we increase the heat resistance in the middle layer up to 0.48 ° C/ W, then there will be
a relative change in the heat flow if the temperature difference remains unchanged. Please
answer as a percentage (%) of the heat flow in item a).

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