Consider the base plate of a 1200-W household iron that has a thickness of L 0.5 cm, base area of A 300 cm2, and thermal conductivity of k 15 W/m · °C. The inner surface of the base plate is subjected to uniform heat flux generated by the resistance heaters inside, and the outer surface loses heat to the surroundings at T 20°C by convection. Taking the convection heat transfer coefficient to be h 80 W/m2 · °C and disregarding heat loss by radiation. Evaluate the temperatures at the inner and the outer surfaces. Resistance heater 1200 W Base plate Insulation 300 cm? T = 20°C h

Consider the base plate of a 1200-W household iron that has a thickness of L 0.5 cm, base area of A 300 cm2, and thermal conductivity of k 15 W/m · °C. The inner surface of the base plate is subjected to uniform heat flux generated by the resistance heaters inside, and the outer surface loses heat to the surroundings at T 20°C by convection. Taking the convection heat transfer coefficient to be h 80 W/m2 · °C and disregarding heat loss by radiation. Evaluate the temperatures at the inner and the outer surfaces. Resistance heater 1200 W Base plate Insulation 300 cm? T = 20°C h

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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Question

Consider the base plate of a 1200-W household iron that has a thickness of L 0.5 cm, base area of A
300 cm2, and thermal conductivity of k 15 W/m · °C. The inner surface of the base plate is subjected
to uniform heat flux generated by the resistance heaters inside, and the outer surface loses heat to the
surroundings at T 20°C by convection.
Taking the convection heat transfer coefficient to be h 80 W/m2 · °C and disregarding heat loss by
radiation. Evaluate the temperatures at the inner and the outer surfaces.
Resistance heater
1200 W
Base plate
Insulation
300 cm?
T= 20°C
h

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