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No, the two most important measures of energy recovery device performance are energy transfer efficiency and concentrate-feedwater mixing.
Efficiency is measured using the following equation:
| Efficiency = | ((HP out Pressure × Flow) + (LP out Pressure × Flow)) |
| ((HP in Pressure × Flow) + (LP in Pressure × Flow)) |
From the equation we can see that efficiency is calculated by evaluating a volumetric loss (lubrication flow) and a frictional loss (differential pressure). Both lubrication flow and dP are a function of the internal design of the PX device and are not affected by orientation. Mixing is primarily a result of rotor speed. Rotor speed is dictated by flow and is also unaffected by orientation.