The outside wall of a building consists of an inner layer of gypsum plaster, k = 0.17 W/ m K and 1.5 cm thick, placed on concrete blocks, k = 1.0 W/m K and 20 cm thick. The outside of the wall is face brick, k = 1.3 W/ m K and 10 cm thick. The heat transfer cocfficients on the inside and outside surfaces of the wall are 8.35 and 34.10 W/m K, respectively. The outside air temperature is -10 °C while the interior air temperature is 20 °C. Dctermine: (a) The rate of hcat transfer per unit arca (b) The surface temperature of the inner surface of the wall. (58.32 W/m2) (13.01 °C)

The outside wall of a building consists of an inner layer of gypsum plaster, k = 0.17 W/ m K and 1.5 cm thick, placed on concrete blocks, k = 1.0 W/m K and 20 cm thick. The outside of the wall is face brick, k = 1.3 W/ m K and 10 cm thick. The heat transfer cocfficients on the inside and outside surfaces of the wall are 8.35 and 34.10 W/m K, respectively. The outside air temperature is -10 °C while the interior air temperature is 20 °C. Dctermine: (a) The rate of hcat transfer per unit arca (b) The surface temperature of the inner surface of the wall. (58.32 W/m2) (13.01 °C)

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

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The outside wall of a building consists of an inner layer of gypsum plaster, k = 0.17 W/ m K and
1.5 cm thick, placed on concrete blocks, k = 1.0 W/m K and 20 cm thick. The outside of the wall
is face brick, k = 1.3 W/ m K and 10 cm thick. The heat transfer cocfficients on the inside and
outside surfaces of the wall are 8.35 and 34.10 W/m K, respectively. The outside air temperature
is -10 °C while the interior air temperature is 20 °C. Dctermine:
(a) The rate of heat transfer per unit area
(b) The surface temperature of the inner surface of the wall.
(58.32 W/m2)
(13.01 °C)

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