Answer to Question #71988 in Molecular Physics | Thermodynamics for maged

Question #71988
An electric hot-plate is maintained at a temperature of 350C and is used to keep a solution just boiling at 95 C. The solution is contained in an enamelled cast-iron vessel of wall thickness 25 mm and enamel thickness 0.8 mm. the heat transfer coefficient for the boiling solution is 5.5 k W/ m2 K, and the thermal conductivities of cast iron and enamel are 50 and 1.05 W/m K respectively . Calculate the resistance to the heat transfer for unit area, and the rate of heat transfer per unit area, then recalculate the rate of heat transfer per unit area if the base of the cast-iron vessel is not perfectly flat,and the resistance of the resultant air film is 35 m2 K/ kW.
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