fan efficiency

fan efficiency

[′fan i‚fish·ən·sē]
(mechanical engineering)
The ratio obtained by dividing a fan's useful power output by the power input (the power supplied to the fan shaft); it is expressed as a percentage.
References in periodicals archive ?
This data can be used to analyze the dependence of fan efficiency on the proposed cross-sectional area of a new shaft.
The implementation of a crossflow fan in a wing was first proposed by Nikolaus Laing in 1964 [5], who together with Bruno Eck are responsible for increasing the crossflow fan efficiency. Hancock [6] worked on raising the efficiency of the crossflow fan implementation at Lockheed up to the value of 82%.
A single-duct VAV system using either all series or all parallel FPTUs was defined in EnergyPlus using the Energy-Plus Objects "HVACTemplate:Zone:VAV:FanPowered" and "HVACTemplate:System:VAV" with a series of temperature, pressure, fan efficiency, and airflow inputs shown in Table 4.
The defaults in the template include values of 70% for the terminal unit fan efficiency, 1,000 Pa (4 in.
Fan efficiency in the designed operating point not less than 82%.
* The MMIL-XTM delivers tip to 42% efficiency, an increase over a typical tubeaxial fan efficiency of 27%.
Fan efficiency requirements appear for the first time.
Changing the size or shape of fans can help to optimise fan efficiency and airflow, thereby reducing energy consumption.
The scientists found that none of the devices performed well in all of the key functions: fan efficiency, efficiency in capturing polluted air for exhaust and sound levels.
Figures 3a and 3b show pressure, efficiency, and power curves for two different fan types to illustrate how the shape of fan efficiency curves affects the fan power draw.
Tom Pelland, director of the next-generation product family at P&W, says: "Engine manufacturers have always had to make some trade-off between fan efficiency and LPT/LPC efficiency.