Heat exchanger calculations
Principles of a heat exchanger
The principles of a heat exchanger, here of the countercurrent type, are shown
below:
 
where
ΔT_{M} = logarithmic mean temperature difference [K] Q = flow of heat [W] A = crosssectional area [m^{2}] W = heat capacity flow [W/K] A = heating area [m^{2}·K] ΔT = temperature difference [K]  
For a differential surface element dA the following
applies:  
Integration gives: 

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Logarithmic mean temperature difference 
Hydraulic diameter 
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