Q1- An exterior wall of a house consists of 10.2 cm brick and 3.8 cm gypsum plaster. What thickness of loosely packed rockwool insulation should be added to reduce the heat transfer through the wall by 80%?

Q1- An exterior wall of a house consists of 10.2 cm brick and 3.8 cm gypsum plaster. What thickness of loosely packed rockwool insulation should be added to reduce the heat transfer through the wall by 80%?

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

Q1- An exterior wall of a house consists of 10.2 cm brick and 3.8 cm gypsum plaster. What
thickness of loosely packed rockwool insulation should be added to reduce the heat transfer
through the wall by 80%?
Thermal conductivity of materials for the wall are
Brick: k= 0.7 W/mK
Gypsum plaster: k=0.48 W/mK
Rockwool: k= 0.065 W/mK

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