Heat Transfer by Conduction through a Plane Wall
Heat Transfer by Conduction Through a Plane Wall Formula |
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| \( Q_c \;=\; - k \; A_c \; ( T_2 - T_1) \;/\; l \) | ||
| Symbol | English | Metric |
| \(Q_c \) = heat transfer by conduction | \(Btu\;/\;hr\) | \(W\) |
| \(A_c \) = area cross-section | \(in^2\) | \(mm^2\) |
| \( T_1 \) = temperature of one surface of the wall | \(F\) | \(K\) |
| \( T_2 \) = temperature of the other surface of the wall | \(F\) | \(K\) |
| \( k \) = thermal conductivity | \(Btu-ft\;/\;hr-ft^2-F\) | \(W\;/\;m-K\) |
| \( l \) = thickness of material | \(in\) | \(mm\) |
Heat Transfer by Conduction Through a Cylindrical Wall Formula |
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| \( Q_c \;=\; 2 \; \pi \; k \; l \; ( T_1 - T_2 ) \;/\; ln \; ( r_2 \;/\; r_1) \) | ||
| Symbol | English | Metric |
| \( Q_c \) = heat transfer by conduction | \(Btu\;/\;hr\) | \(W\) |
| \( A_c \) = area cross-section | \(in^2\) | \(mm^2\) |
| \( \pi \) = Pi | \(3.141 592 653 ...\) | \(3.141 592 653 ...\) |
| \( r_1 \) = radius of one surface of the wall | \(in\) | \(mm\) |
| \( r_2 \) = radius of the other surface of the wall | \(in\) | \(mm\) |
| \( T_1 \) = temperature of one surface of the wall | \(F\) | \(K\) |
| \( T_2 \) = temperature of the other surface of the wall | \(F\) | \(K\) |
| \( k \) = thermal conductivity | \(Btu-ft\;/\;hr-ft^2-F\) | \(W\;/\;m-K\) |
| \( l \) = thickness of material | \(in\) | \(mm\) |
Tags: Heat Transfer Heat