2.5 10 mm tra sa Ace teel Example 2.2 A mild steel tank wall of thickness 10 mm contains water at 90C when the atmospheric temperature is 15C. The thermal conductivity of mild steel is 50 W/m K, and the heat transfer coefficients for the inside and outside of the tank are 2800 and 11 W/m K, respectively. Calculate: 12 Exle 2