The base plate of an iron is 0.6 cm thick. The plate is subjected to 100 W

Question:

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 cm2, resulting in a uniform flux generated on the inside surface. The thermal conductivity of the metal base plate is k = 20 W/m-oC. The outside ambient air temperature is 20 oC with a heat transfer coefficient of 20 W/m2 -oC 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.
Figure P13-15