b. Consider a 1000-W iron whose base plate is made of 0.005-m-thick aluminum alloy 195, Cast. The base plate has a surface area of 0.03 m?. Initially, the iron is in thermal equilibrium with the ambient air at 22 *C. Taking the heat transfer coefficient at the surface of the base plate to be 12 W/m² K and assuming 80 percent of the heat generated in the resistance wires is transferred to the plate, i. determine how long it will take for the plate temperature to reach 150 °C. Is it realistic to assume the plate temperature to be uniform at all times? ii. Air 22°C 1000 W ion

b. Consider a 1000-W iron whose base plate is made of 0.005-m-thick aluminum alloy 195, Cast. The base plate has a surface area of 0.03 m?. Initially, the iron is in thermal equilibrium with the ambient air at 22 *C. Taking the heat transfer coefficient at the surface of the base plate to be 12 W/m² K and assuming 80 percent of the heat generated in the resistance wires is transferred to the plate, i. determine how long it will take for the plate temperature to reach 150 °C. Is it realistic to assume the plate temperature to be uniform at all times? ii. Air 22°C 1000 W ion

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

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

b. Consider a 1000-W iron whose base plate is made of 0.005-m-thick aluminum alloy 195, Cast. The base
plate has a surface area of 0.03 m?. Initially, the iron is in thermal equilibrium with the ambient air at
22 °C. Taking the heat transfer coefficient at the surface of the base plate to be 12 w/m²K and
assuming 80 percent of the heat generated in the resistance wires is transferred to the plate,
i.
determine how long it will take for the plate temperature to reach 150 °C.
Is it realistic to assume the plate temperature to be uniform at all times?
ii.
Air
22°C
1000 W
iron

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