When modeling an HVAC system using series fan-powered terminal units (FPTUs) with permanent split capacitor motors in EnergyPlus, the user must enter values for fan total pressure rise and fan/motor efficiency.
A search of fan literature would show that the proper (technical) input for pressure rise should be the fan total pressure rise.
ed] overall fan efficiency when the fan total pressure
is included through a test with outlet duct [[eta].
With the exit air velocity known, the velocity pressure was calculated and added to the measured static pressure differential across the fan to obtain a fan total pressure.
Figure 1 shows sample data for the fan/motor total efficiency versus fan total pressure for the 1 hp (746 W) fan/motor combination from Manufacturer B.
The second is to use fan total pressure instead of fan static pressure for fan selection.
The fan total pressure is merely the algebraic sum of the fan inlet and outlet values.
In these graphs, corrected fan total pressure
rise is plotted at both fan speeds as a function of corrected volumetric flow rate.
2015b) presented data showing fan/motor efficiency was dependent on both the fan total pressure
and the ECM setting (or fan airflow).
With the exit velocity known, the velocity pressure was calculated and added to the measured static pressure differential across the fan to obtain a fan total pressure
The fan total pressure
change was numerically equal to the total pressure at the fan outlet, which is calculated from Equation 5.
Fan static pressure is defined  as the difference between the fan total pressure
and the fan velocity pressure: