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?

In-plane slab, the addition of insulation always reduced the heat loss. But in the case of cylinder…

Q2: A 2.5 -mm-diameter electrical wire is insulated by a 2-mm-thick rubberized sheath (k = 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 %3D 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?

Q2: A 2.5 -mm-diameter electrical wire is insulated by a 2-mm-thick rubberized sheath (k = 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 %3D 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?

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

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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