Heat exchanger calculations
Principles of a heat exchanger
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The principles of a heat exchanger, here of the counter-current type, are shown
below:
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where
ΔTM = logarithmic mean temperature difference [K] Q = flow of heat [W] A = cross-sectional area [m2] W = heat capacity flow [W/K] A = heating area [m2·K] ΔT = temperature difference [K] |
| For a differential surface element dA the following
applies: | |
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| Integration gives: |
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| Logarithmic mean temperature difference |
| Hydraulic diameter |
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