A representative cross-section of a 31.5-cm-thick wall is shown in the left figure below (not drawn to scale). The thermal conductivities of the materials used are shown on the right figure below. The left and right surfaces of the wall are maintained at uniform temperatures of 250°C and 41°C, respectively. Assuming that the heat transfer through the wall is one-directional, and that the representative height of layer C is 25.5 cm, determine (a) the thermal resistances for each section (A to G), (b) the temperature at the point where the sections ABCD meet, (c) the heat transfer rate per unit

A representative cross-section of a 31.5-cm-thick wall is shown in the left figure below (not drawn to scale). The thermal conductivities of the materials used are shown on the right figure below. The left and right surfaces of the wall are maintained at uniform temperatures of 250°C and 41°C, respectively. Assuming that the heat transfer through the wall is one-directional, and that the representative height of layer C is 25.5 cm, determine (a) the thermal resistances for each section (A to G), (b) the temperature at the point where the sections ABCD meet, (c) the heat transfer rate per unit

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 representative cross-section of a 31.5-cm-thick wall is shown in the left figure below (not drawn to
scale). The thermal conductivities of the materials used are shown on the right figure below. The left
and right surfaces of the wall are maintained at uniform temperatures of 250°C and 41°C,
respectively. Assuming that the heat transfer through the wall is one-directional, and that the
representative height of layer C is 25.5 cm, determine (a) the thermal resistances for each section (A
to G), (b) the temperature at the point where the sections ABCD meet, (c) the heat transfer rate per unit
length across the wall, in kW/m (d) the temperature (in °C) where HI meet, (e) the temperature drop
т
across section CD, and (f) the total heat transferred (in kW) for a 7m-high and 5m-long wall.
A
a
b
C
d
e
E
dimension
2.0
4.0
5.5
9.0
11.0
(in cm)
f
i
3.0
3.0
6.0
2.5
12.0
В
F
A
В
C
E
H
value of k
3.0
7.5
23.0
2.0
3.0
(in W/m-C)
G
H
I
i
14.0
2.0
7.0
20.0
a
d.
e

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