Performance of low-pressure fans operating with hot air

Performance characteristics of fans are generally provided for the normal temperature and pressure conditions (tI = 20?C, pI = 101.325 kPa, ? I = 1.2 kg/m3). Very often, fans operate in different air conditions, occasionally at different air temperatures. In these cases, equations obtained by the la...

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Bibliographic Details
Published in:Thermal science 2016-01, Vol.20 (suppl. 5), p.1435-1447
Main Authors: Bogdanovic-Jovanovic, Jasmina, Milenkovic, Dragica, Spasic, Zivan, Svrkota, Dragan
Format: Article
Language:English
Subjects:
Aerodynamics
Air temperature
Axial flow
Computational fluid dynamics
Computer simulation
Fluid flow
Low pressure
Parameters
Reynolds number
Similarity
Temperature
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Summary:Performance characteristics of fans are generally provided for the normal temperature and pressure conditions (tI = 20?C, pI = 101.325 kPa, ? I = 1.2 kg/m3). Very often, fans operate in different air conditions, occasionally at different air temperatures. In these cases, equations obtained by the law of similarity are usually used for recalculation of the fan operating parameters. Increasing the inlet air temperature causes a decrease in the characteristic of Reynolds number, and may lead to efficiency lowering of the fan. There are also some empirical formulas for recalculation of fan efficiency, when operating at different air temperatures. In this paper, the common way for obtaining fan performance for different operating conditions (air temperature changing) is presented. The results, obtained by recalculation of fan parameters using a law of similarity, are compared to numerical simulation results of the axial-flow fan operating with different air temperatures. These results are compared with results obtained by some recommended empirical formulas, as well. This paperwork is limited to low-pressure and mid-pressure fans, which represents the majority of all fans used in practice, for different purposes. nema
ISSN:0354-9836
2334-7163
DOI:10.2298/TSCI16S5435B