The base plate of an iron has a thickness of L7mmand is

Chapter 5, Problem 5.11

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The base plate of an iron has a thickness of L?7mmand is made from an aluminum alloy (??2800 kg/m3,c?900 J/kg?K, k?180 W/m?K, ??0.80). An electricresistance heater is attached to the inner surface of theplate, while the outer surface is exposed to ambient airand large surroundings at T??Tsur?25C. The areas ofboth the inner and outer surfaces are As?0.040 m2.If an approximately uniform heat flux of qh?1.25104W/m2is applied to the inner surface of the baseplate and the convection coefficient at the outer surfaceis h?10 W/m2?K, estimate the time required for theplate to reach a temperature of 135C. Hint:Numericalintegration is suggested in order to solve the problem.

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