Question1

2-20 Starting with an energy balance on a rectangular volume element, derive the one-

dimensional transient heat conduction equation for a plane wall with constant thermal

conductivity and no heat generation.

Question2

2-55 Electrically heated draw batch furnaces are commonly used in the heat treatment

industry. Consider a draw batch furnace front made of a 20-mm thick steel plate with a

thermal conductivity of 25 W/m-K. The furnace is situated in a room with surrounding air

temperature of 20 °C and an average convection heat transfer coefficient of l0 W/m2-K. If the

inside surface of the furnace front is subjected to uniform heat flux of 5 kW/m2 and the outer

surface has an emissivity of 0.30, determine the inside surface temperature of the furnace

front. Answer; 598 K