A brick wall 25cm thick, initially at 80°C has a medium at 15°C suddenly placed in...

A brick wall 25cm thick, initially at 80°C has a medium at 15°C suddenly placed in conatct with both of its surfaces through a heat transfer coefficient of 90W/m2°C. Find the temperature at a point 2.5cm from the surafce after 10hrs have elapsed. Find also the heat that has flowed out of the wall during that time. Take ρ = 1602kg/m3, cp = 0.84kJ/kg°C, k = 0.69W/m°C,and α = 5.2×10-7m2/s.

Expert Solution

The temperature at 2.5 cm away from the wall can be determined using transient state equation. By finding the Fourier or Biot number, we shall determine if lumped parameter is applicable or not. If not we shall use heisler chart for flat plate. (Brick can be considered a flat plate).

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samet mamat answered 2 years ago

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