# fan total pressure

## fan total pressure

[¦fan ¦tōd·əl ¦presh·ər]
(mechanical engineering)
The algebraic difference between the mean total pressure at the fan outlet and the mean total pressure at the fan inlet.
References in periodicals archive ?
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.
Quantity Symbols n impeller rotational speed [p.sup.fs] fan static pressure [P.sub.r] fan shaft input power [p.sub.t] total pressure [q.sub.v] volumetric airflow rate [[eta].sub.ed] overall fan efficiency when the fan total pressure is included through a test with outlet duct [[eta].sub.esd] overall fan efficiency when tested without outlet duct BY ARMIN HAUER, MEMBER ASHRAE
* The overall fan efficiency when tested without outlet duct is [[eta].sub.esd]; when the fan total pressure is included through a test with outlet duct then the overall efficiency is [[eta].sub.ed]
The pressure ultimately responsible for overcoming the system resistance is the fan total pressure, [P.sub.tf], the total pressure at the fan outlet less the total pressure at the fan inlet ([P.sub.tf] = [P.sub.to] - [P.sub.ti]).
Finally, the fan static pressure, [P.sub.sf], is the fan total pressure less the fan velocity pressure ([P.sub.sf] = [P.sub.tf] - [P.sub.vf]).
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. The fan/motor total efficiency f was calculated using fan total pressure, mass flow of the air, and fan power
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).
The second is to use fan total pressure instead of fan static pressure for fan selection.
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/motor total efficiency (r" was calculated using fan total pressure, mass flow of the air, and fan power:
Fan static pressure is defined  as the difference between the fan total pressure and the fan velocity pressure:
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