A cold storage room has walls made of 23 cm of brick on the outerside, 8 cm plastic foam and finally 1.5 cm of wood on the inside. The outside and inside temperature are 22 and $-2^{\circ} \mathrm{C}$ respectively. The inside and outside heat transfer coefficients are 29 and $12 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$. The thermal conductivities of brick, foam and wood are $0.98,0.028$ and $0.12 \mathrm{~W} / \mathrm{m} / \mathrm{K}$ respectively. If the total wall area is $90 \mathrm{~m}^{2}$. Determine the rate of heat removal and the temperature of inside surface of the brick.

Explanation

This calculation involves applying the heat transfer equation to each layer of the wall and considering the heat transfer through conduction and convection.

Explanation

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