The figure shows the cross section of a wall made of three layers. The thicknesses of the layers are L1, L2 =0.500 L1. and L3 = 0.350 L1. The thermal conductivities are k1. k2 = 0.800 k1. and k3 = 0.680 k1. The temperatures at the left and right sides of the wall are TH= 20 °C and Tc=-10 °C, respectively. Thermal conduction is steady. (a) What is the temperature difference AT2 across layer 2 (between the left and right sides of the layer)? If k2 were, instead, equal to 1.100 k1. (b) would the rate at which energy is conducted through the wall be greater than, less than, or the same as previously, and (c) what would be the value of AT2?

The figure shows the cross section of a wall made of three layers. The thicknesses of the layers are L1, L2 =0.500 L1. and L3 = 0.350 L1. The thermal conductivities are k1. k2 = 0.800 k1. and k3 = 0.680 k1. The temperatures at the left and right sides of the wall are TH= 20 °C and Tc=-10 °C, respectively. Thermal conduction is steady. (a) What is the temperature difference AT2 across layer 2 (between the left and right sides of the layer)? If k2 were, instead, equal to 1.100 k1. (b) would the rate at which energy is conducted through the wall be greater than, less than, or the same as previously, and (c) what would be the value of AT2?

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

The figure shows the cross section of a wall made of three layers. The thicknesses of the layers are L1. L2 =0.500 L1. and L3 = 0.350 L1.
The thermal conductivities are k1, k2 = 0.800 k1, and k3 = 0.680 k1. The temperatures at the left and right sides of the wall are TH = 20 °C
and Tc = -10 °C, respectively. Thermal conduction is steady.
(a) What is the temperature difference AT2 across layer 2 (between the left and right sides of the layer)?
If k2 were, instead, equal to 1.100 k1,
(b) would the rate at which energy is conducted through the wall be greater than, less than, or the same as previously,
and
(c) what would be the value of AT2?
k1
ko k3
TH
Tc
L1
L9 L3
(a) AT2 =
i
(b)
(c) AT2= i

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