__Pressure drop and head loss calculation in an exchanger__

- Calculating the pressure drop across a heat exchanger uses the equivalent diameter:

- If you want to know the pressure drop of the fluid through the tubes, it suffices to calculate the pressure drop in one tube (onglet pertes de charge reguliere).

- If the tubes are in parallel load losses are balanced by distributing the flow rate, the pressure drop of all tubes is equal to the pressure drop of 1 tube.
- the head loss are added only if the tubes are in series (one after another)