Parametric study on spray cooling system for optimising nozzle design with pre-cooling application in natural draft dry cooling towers

Alkhedhair, Abdullah, Jahn, Ingo, Gurgenci, Hal, Guan, Zhiqiang and He, Suoying (2016) Parametric study on spray cooling system for optimising nozzle design with pre-cooling application in natural draft dry cooling towers. International Journal of Thermal Sciences, 104 448-460. doi:10.1016/j.ijthermalsci.2016.02.004


Author Alkhedhair, Abdullah
Jahn, Ingo
Gurgenci, Hal
Guan, Zhiqiang
He, Suoying
Title Parametric study on spray cooling system for optimising nozzle design with pre-cooling application in natural draft dry cooling towers
Journal name International Journal of Thermal Sciences   Check publisher's open access policy
ISSN 1290-0729
Publication date 2016-06-01
Sub-type Article (original research)
DOI 10.1016/j.ijthermalsci.2016.02.004
Open Access Status Not yet assessed
Volume 104
Start page 448
End page 460
Total pages 13
Place of publication Issy les Moulineaux, France
Publisher Elsevier Masson
Language eng
Formatted abstract
Pre-cooling of inlet air with water spray is proposed for performance enhancement of natural draft dry cooling towers (NDDCTs) during high ambient temperature periods. Previous experiments showed promising results on cooling enhancement using spray cooling. Spray nozzles characteristics are an essential element for designing spray cooling systems. A parametric analysis is conducted on the effect of different spray characteristics parameters and various hollow-cone droplet size distribution patterns on a spray cooling system performance for nozzle design optimisation. A validated Eulerian–Lagrangian 3-D model with a novel nozzle representation method for hollow-cone nozzles was used to perform the analysis. The results can help prepare design principles of effective spray nozzles for spray cooling systems. The results showed a clear trend of increasing spray cooling efficiency as droplet velocity increases due to better spray dispersion. 15% improvement in cooling performance was achieved by increasing droplet velocity from 20 to 80 m/s. A spray nozzle with high injection velocity, small droplet size distribution, large cone angle and a droplet size pattern of mean droplet size increasing towards the spray periphery was found to be the best for sprays with Dv90 ≤ 50 μm. Complete evaporation was successively achieved within 5 m distance using a spray with droplet size distribution of Dv90 = 20 μm and droplet velocity of 120 m/s at an air velocity of 1 m/s.
Keyword Spray cooling
Air pre-cooling
Natural draft
Nozzle optimisation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Created: Sat, 24 Sep 2016, 22:56:42 EST by Zhiqiang Guan on behalf of School of Mechanical and Mining Engineering