A 4-m high and 6-m-wide wall consists of long 15-cm x 20 cm cross section horizontal bricks (k of 0.69 W/m K) separated by 2-cm thick plaster layers (k of 0.2 W/m K). There are also 2-cm-thck plaster layers on each side of the brick and a 3-cm-thick rigid foam (k of 0.025 W/m K) on the inner side of the wall. See figure below. The indoor and the outdoor air temperatures are 18 and -8°C, respectively. Convective heat transfer coefficient for inside and outer surfaces are 8 and 22 W/m²K, respectively. Assume 1-D heat transfer. Neglect radiation. a. assume any plane wall normal to the x-direction is isothermal, draw the thermal circuit and calculate the heat transfer rate through the wall assume any plane parallel to the x-axis is adiabatic,, draw the thermal circuit and calculate the heat transfer rate through the wall Compare the results from a and b, discuss the reason for any difference there might be. b. c.

A 4-m high and 6-m-wide wall consists of long 15-cm x 20 cm cross section horizontal bricks (k of 0.69 W/m K) separated by 2-cm thick plaster layers (k of 0.2 W/m K). There are also 2-cm-thck plaster layers on each side of the brick and a 3-cm-thick rigid foam (k of 0.025 W/m K) on the inner side of the wall. See figure below. The indoor and the outdoor air temperatures are 18 and -8°C, respectively. Convective heat transfer coefficient for inside and outer surfaces are 8 and 22 W/m²K, respectively. Assume 1-D heat transfer. Neglect radiation. a. assume any plane wall normal to the x-direction is isothermal, draw the thermal circuit and calculate the heat transfer rate through the wall assume any plane parallel to the x-axis is adiabatic,, draw the thermal circuit and calculate the heat transfer rate through the wall Compare the results from a and b, discuss the reason for any difference there might be. b. 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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1. A 4-m high and 6-m-wide wall consists of long 15-cm x 20 cm cross section horizontal bricks (k of 0.69
W/m K) separated by 2-cm thick plaster layers (k of 0.2 W/m K). There are also 2-cm-thck plaster layers
on each side of the brick and a 3-cm-thick rigid foam (k of 0.025 W/m K) on the inner side of the wall. See
figure below. The indoor and the outdoor air temperatures are 18 and -8°C, respectively. Convective heat
transfer coefficient for inside and outer surfaces are 8 and 22 W/m² K, respectively. Assume 1-D heat
transfer. Neglect radiation.
Foam
inside
a. assume any plane wall normal to the x-direction is isothermal, draw the thermal circuit and
calculate the heat transfer rate through the wall
b.
c.
assume any plane parallel to the x-axis is adiabatic,, draw the thermal circuit and calculate the
heat transfer rate through the wall
Compare the results from a and b, discuss the reason for any difference there might be.
brick
brick
brick
L15 cm.
X
plaster
1 cm
20 cm
1 cm
outside

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