Ql: Find the following:A) The heat transfer per unit area through the composite wall in Figure below.Assume one-dimensional heat flowB) The temperature at the point where the sections B, D and C meetKA = 100 W/m.°CKg= 20 W/m. °CA = 0.1 m?Kc = 40W/m.°CKp = 65 W/m.°CT= 370°CT= 66°CH F 75 cm →fa5.0 cm-|2.5 cm Q2: A 2.5 -mm-diameter electrical wire is insulated by a 2-mm-thick rubberizedsheath (* = 0.11 W/m K), and the wire/sheath interface. The convection heattransfer coefficient of the outer surface of the sheath is 10 W/m² K, and thetemperature of the ambient air is 20 C. If the temperature of the insulation may notexceed 50 C, what is the maximum allowable electrical power that may bedissipated per unit length of the conductor? What is the critical radius of theinsulation?

As given above that T1=370°C and T2=66°C , AC=0.1 m2 ;LA= 2.5 cm, LB=LD=7.5 cm , LC=5 cm ; So the…

Q1: Find the following: A) The heat transfer per unit area through the composite wall in Figure below Assume one-dimensional heat flow B) The temperature at the point where the sections B, D and C meet KA = 100 W/m.°C Kg = 20 W/m. °c A = 0.1 m² Kc = 40 W/m.C ° Kp = 65 W/m.C T= 370°C T= 66°C 25 cm - E 7.5 cm →-5.0 cm»|

Q1: Find the following: A) The heat transfer per unit area through the composite wall in Figure below Assume one-dimensional heat flow B) The temperature at the point where the sections B, D and C meet KA = 100 W/m.°C Kg = 20 W/m. °c A = 0.1 m² Kc = 40 W/m.C ° Kp = 65 W/m.C T= 370°C T= 66°C 25 cm - E 7.5 cm →-5.0 cm»|

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

Ql: Find the following:
A) The heat transfer per unit area through the composite wall in Figure below.
Assume one-dimensional heat flow
B) The temperature at the point where the sections B, D and C meet
KA = 100 W/m.°C
Kg
= 20 W/m. °C
A = 0.1 m?
Kc = 40
W/m.°C
Kp = 65 W/m.°C
T= 370°C
T= 66°C
H F 75 cm →fa5.0 cm-|
2.5 cm

Q2: A 2.5 -mm-diameter electrical wire is insulated by a 2-mm-thick rubberized
sheath (* = 0.11 W/m K), and the wire/sheath interface. The convection heat
transfer coefficient of the outer surface of the sheath is 10 W/m² K, and the
temperature of the ambient air is 20 C. If the temperature of the insulation may not
exceed 50 C, what is the maximum allowable electrical power that may be
dissipated per unit length of the conductor? What is the critical radius of the
insulation?

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