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Engineering

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Students assembled a home-made oven with a composite wall consisting of three different materials, which dimensions are LA=0.3 m, LB=0.15 m and LC=0.15 m. Two of the materials are of known thermal conductivity, kA=20 W/mK and kC=50 W/mK. The thermal conductivity $k_B$ of a third material, B, which has been placed between materials A and C, is unknown. Under steady-state operating conditions, temperature measurements reveal an outer surface with Ts,out= 20 °C, and an inner surface with Ts,in= 600 °C. The air within the oven has a temperature of T∞,in= 800 °C, while the air outside the oven has a temperature of T∞,out= 15 °C. The inside convection coefficient is ĥin=25 W/m2K. Radiation should not be taken into account.

Determine the convection coefficient in W/m2K of the outside air.

Determine the temperature T2 in °C.

Determine the conductivity in W/m*K of material B.

Determine the heat transfer rate by convection in W/m2 from the air within the oven.

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