+ Eg - [h(T - Too) + - =
Use the above equation with E_gen= 0 to solver
The base plate of an iron has a thickness of L = 7 mm
and is made from an aluminum alloy (p = 2800kg/m³,
c = 900 J/kg K, k = 180 W/m- K, s = 0.80). An electric
resistance heater is attached to the inner surface of the
plate, while the outer surface is exposed to ambient air
and large surroundings at Two = Thu = 25°C. The areas of
both the inner and outer surfaces are A, = 0.040 m².
(p. k. 2, q%. 1, A,)
If an approximately uniform heat flux of d'e = 1.25 X
104 W/m² is applied to the inner surface of the base
plate and the convection coefficient at the outer surface
is h = 10 W/m2.1 K, estimate the time required for the
plate to reach a temperature of 135°C. Hint: Numerical
integration is suggested in order to solve the problem.
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