The base plate of an iron is 0.6 cm thick. The plate is
subjected to 100 W of power (provided by resistance heaters inside the iron, as
shown in Figure P13–15), over a base plate cross-sectional area of 250 cm
2
,
resulting in a uniform flux generated on the inside surface. The thermal
conductivity of the metal base plate is k = 20 W/ m-C. The outside ambient air
temperature is 20 C with a heat transfer coefficient of 20W/ m
2
– C
at steady-state conditions. Assume one-dimensional heat transfer through the
plate thickness. Using three elements, model the plate to determine the
temperatures at the inner surface and interior one-third points.
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