## Related questions with answers

Hot water flows through a PVC $(k=0.092 \mathrm{~W} / \mathrm{m} \cdot \mathrm{K})$ pipe whose inner diameter is $2 \mathrm{~cm}$ and whose outer diameter is $2.5 \mathrm{~cm}$. The temperature of the interior surface of this pipe is $35^{\circ} \mathrm{C}$, and the temperature of the exterior surface is $20^{\circ} \mathrm{C}$. The rate of heat transfer per unit of pipe length is (a) $22.8 \mathrm{~W} / \mathrm{m}$ (b) $38.9 \mathrm{~W} / \mathrm{m}$ $(c)$ $48.7 \mathrm{~W} / \mathrm{m}$ (d) $63.6 \mathrm{~W} / \mathrm{m}$ (e) $72.6 \mathrm{~W} / \mathrm{m}$

Solution

Verified**Given:**
$k=0,092 \frac{\text W}{\text m \cdot K}$
$d_1=2 \text{ cm}$
$d_2=2,5 \text{ cm}$
$T_1=35\degree C$
$T_2=20\degree C$
We are given inner and outer diameters and temperatures and we have to determine the rate of heat transfer per unit of pipe length.

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