# A steel tank of wall thickness (10 mathrm{~mm}) contains water at (90^{circ} mathrm{C}). Calculate the rate of

## Question:

A steel tank of wall thickness \(10 \mathrm{~mm}\) contains water at \(90^{\circ} \mathrm{C}\). Calculate the rate of heat loss per \(\mathrm{m}^{2}\) of tank surface area when the atmospheric temperature is \(15^{\circ} \mathrm{C}\). The thermal conductivity of mild steel is \(55 \mathrm{~W} / \mathrm{mK}\), and the heat transfer coefficients for the inside and outside of the tank are 2,550 and \(24 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}\), respectively. Also, calculate the temperature of the outside surface of the tank.

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