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, obtain an expression for the variation of temperature in the base plate, and evaluate the temperatures at the inner and the outer surfaces. . Resistance heater 1200 W Insulation L h Base plate 300 cm² T = 20°C x
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, obtain an expression for the variation of temperature in the base plate, and evaluate the temperatures at the inner and the outer surfaces. . Resistance heater 1200 W Insulation L h Base plate 300 cm² T = 20°C x
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.38P:
2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from...
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![EXAMPLE:-
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, obtain
an expression for the variation of
temperature in the base plate, and
evaluate the temperatures at the inner
and the outer surfaces.
∞0
T./)/Yr
Mech Eng LOK
Resistance heater
1200 W
Insulation
L
h
Base plate
300 cm²
T= 20°C](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3e31c3f6-334d-4016-8d57-4d042a66ce10%2F54dbff38-d26c-435e-9333-bab6f8611e7d%2Fvvnrvf8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:EXAMPLE:-
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, obtain
an expression for the variation of
temperature in the base plate, and
evaluate the temperatures at the inner
and the outer surfaces.
∞0
T./)/Yr
Mech Eng LOK
Resistance heater
1200 W
Insulation
L
h
Base plate
300 cm²
T= 20°C
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