Consider a plane composite wall that is composed of three materials. Given the thermal conductivities k= 1.5 W/m.K and kc = 1.75 W/m.K thicknesses L=40 mm, L= 25 mm, Lc= 30 mm and the contact resistance at the interface between the two materials (A, and B) is known to be 0.30 m².K/W. 2 Material A adjoins a fluid at 35°C for which h=10 =W/m².K, and material C adjoins a fluid at 22°C for which h= 20 W/m².K. Given that the temperature Ts,i = 31ºC. Answer the followings: (a) What is the rate of heat transfer through a wall that is 3 m high by 4 m wide?

Consider a plane composite wall that is composed of three materials. Given the thermal conductivities k= 1.5 W/m.K and kc = 1.75 W/m.K thicknesses L=40 mm, L= 25 mm, Lc= 30 mm and the contact resistance at the interface between the two materials (A, and B) is known to be 0.30 m².K/W. 2 Material A adjoins a fluid at 35°C for which h=10 =W/m².K, and material C adjoins a fluid at 22°C for which h= 20 W/m².K. Given that the temperature Ts,i = 31ºC. Answer the followings: (a) What is the rate of heat transfer through a wall that is 3 m high by 4 m wide?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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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

Consider a plane composite wall that is composed of three materials.
Given the thermal conductivities k= 1.5 W/m.K and k = 1.75 W/m.K
thicknesses L=40 mm, L= 25 mm, Lc= 30 mm
and the contact resistance at the interface between the two materials
(A, and B) is known to be 0.30 m².K/W.
2
Material A adjoins a fluid at 35°C for
2
which h = 10 = W/m .K, and material C adjoins a fluid at 22°C for
A
2
which h= 20 W/m².K.
Given that the temperature Ts,i = 31°C.
Answer the followings:
(a) What is the rate of heat transfer through a wall that is 3 m high by 4 m wide?

Ts, i
hA
KA
LA
TA
KR
-TB
kc
LB LC
S, O
hc

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