A 0.0508 m thick aluminum plate is initially uniform in temperature at 27°C. Suddenly the plate is immersed in a convection environment T = 100°C, h=9,330 W/m2°C. Evaluate thermal properties of the plate at 27°C. Consider the following:

i) Determine the time (s) for the mid-plane temperature to reach 70°C.

ii) For the same time as in part (i), calculate the surface temperature (°C).

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.