Heat exchanger calculations

Hydraulic diameter

The hydraulic diameter, dh, is used instead of the geometrical diameter for channels of non-circular shape.

dh is defined as:

Hydraulic diameter           

For some typical geometries dh becomes:

circular tube

dh of a circular tube
square tube

dh of a square tube
two concentric tubes

dh of two concentric tubes

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Principles of a heat exchanger
Logarithmic mean temperature and theta value

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