Investigation on the influence of injection direction on the spray cooling performance in natural draft dry cooling tower

Sun, Yubiao, Guan, Zhiqiang, Gurgenci, Hal, Hooman, Kamel, Li, Xiaoxiao and Xia, Lin (2017) Investigation on the influence of injection direction on the spray cooling performance in natural draft dry cooling tower. International Journal of Heat and Mass Transfer, 110 113-131. doi:10.1016/j.ijheatmasstransfer.2017.02.069


Author Sun, Yubiao
Guan, Zhiqiang
Gurgenci, Hal
Hooman, Kamel
Li, Xiaoxiao
Xia, Lin
Title Investigation on the influence of injection direction on the spray cooling performance in natural draft dry cooling tower
Journal name International Journal of Heat and Mass Transfer   Check publisher's open access policy
ISSN 0017-9310
1879-2189
Publication date 2017-07-01
Sub-type Article (original research)
DOI 10.1016/j.ijheatmasstransfer.2017.02.069
Open Access Status Not yet assessed
Volume 110
Start page 113
End page 131
Total pages 19
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2018
Language eng
Abstract In arid areas, natural draft dry cooling tower (NDDCT) has become the primary choice in concentrating solar thermal power plants due to its advantages of low water consumption, low maintenance cost and little parasite loss. However, NDDCT suffers from deteriorated cooling performance in hot summer days, causing net power loss for power plants. To solve this problem, we propose a pre-cooling technology by introducing a spray of controlled and small quantity of fine water droplets to cool the inlet air and thus improve the cooling tower performance when ambient temperature is high. The effective pre-cooling requires the careful arrangement of spray nozzles. Here the optimal injection for a hollow cone nozzle has been identified based on CFD study. This study shows that pre-cooling performance heavily depends on the injection direction of nozzle. For a single nozzle with the water flowrate of 5 g/s, the largest temperature drop is 1.27 °C, corresponding to the radiator temperature of 38.73 °C. It is found that the injection angle varies with the height of nozzle location to achieve full evaporation.
Keyword Full evaporation
Injection direction
Natural draft dry cooling tower
Spray cooling
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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