Heat Transfer by Conduction Through a Cylindrical Wall Formula |
||
|
\(\large{ Q_c \;=\; \dfrac { 2 \cdot \pi \cdot k \cdot l \cdot \left( T_1 - T_2 \right) }{ ln \cdot \left( \dfrac {r_2 }{ r_1 } \right) } }\) |
||
| Symbol | English | Metric |
| \(\large{ Q_c }\) = heat transfer by conduction | \(\large{\frac{Btu}{hr}}\) | \(\large{W}\) |
| \(\large{ l }\) = length of material | \(\large{ft}\) | \(\large{m}\) |
| \(\large{ r_1 }\) = radius inside diameter (ID) | \(\large{in}\) | \(\large{mm}\) |
| \(\large{ r_2 }\) = radius outside diameter (OD) | \(\large{in}\) | \(\large{mm}\) |
| \(\large{ T_1 }\) = temperature of one surface of the wall | \(\large{F}\) | \(\large{K}\) |
| \(\large{ T_2 }\) = temperature of the other surface of the wall | \(\large{F}\) | \(\large{K}\) |
| \(\large{ k }\) = thermal conductivity | \(\large{\frac{Btu-ft}{hr-ft^2-F}}\) | \(\large{\frac{W}{m-K}}\) |
