A billet of steel of the form of a parallelepiped with dimensions 2 m 2 m 5 m, originally at 300°C, is placed in a radiant furnace, where the furnace temperature is held at 1000°C. Deter mine the...

A billet of steel of the form of a parallelepiped with dimensions 2 m
2 m

5 m, originally at 300°C, is placed in a radiant furnace, where the furnace temperature is held at 1000°C. Deter mine the temperature at the centre after 30 minutes. For steel, take k = 35 W/m K,

= 7800 kg/m³, c_p
= 0.83 kJ/kg K, while h = 233 W/m²
K.