Exchanged Heat in a Heat Exchanger Formula |
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\( Q \;=\; h \cdot A \cdot LMTD \) (Exchanged Heat in a Heat Exchanger) \( h \;=\; \dfrac{ Q }{ A \cdot LMTD } \) \( A \;=\; \dfrac{ Q }{ h \cdot LMTD } \) \( LMTD \;=\; \dfrac{ Q }{ h \cdot A } \) |
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| Symbol | English | Metric |
| \( Q \) = exchanged heat duty | \(Btu\;/\;lbm\) | \(J\;/\;kg\) |
| \( A \) = exchange area | \(ft^2\) | \(m^2\) |
| \( h \) = heat transfer coefficient | \(Btu\;/\;hr-ft^2-F\) | \(W\;/\;m^2-K\) |
| \( LMTD \) = logarithmic mean temperature differential | \(Btu\;/\;lbm\) | \(J\;/\;kg\) |
