In a production facility, 3-cm-thick large brass plates (k - 110 W/m2 K, - 8530 kg/m3 , c = 380 J/kg-K. and =

In a production facility, 3-cm-thick large brass plates (k - 110 W/m2 ·K, ρ - 8530 kg/m3 , cρ = 380 J/kg-K. and α = 33.9 × 10-6 m2 /s) that are initially at a uniform temperature of 25°C are heated by passing them through an oven maintained at 700°C. The plates remain in the oven for a period of 10 min. Taking the convection heat transfer coefficient to be h = 80 W/m2 ·K, determine the surface temperature of the plates when they come out of the oven.

FIGURE P 18-43 

Furnace, 700C 3 cm Brass plate 25C