Abstract
CFD analysis of a wind tunnel with a single spray nozzle was conducted for the water spray system in the natural draft dry cooling tower (NDDCT) built at the University of Queensland. The CFD model was validated with the experiment results. The comparison of pre-cooling performance between the vertical arranged nozzle (VAN) and the horizontal arranged nozzle (HAN) shows that the VAN has better performance than the HAN within the inlet air velocity (va) ranges (0.8–1m/s) of the NDDCT during summer season. The impact of several physical parameters of the continuous phase on the maximum fully evaporated water mass flow (mmaxew) with the VAN was also conducted. The results show that mmaxew witnesses a decrease with the increasing of va from 0.8m/s to 1m/s. The ambient air temperature and the relative humidity have significant impact on mmaxew. The increasing of turbulence intensity could improve mmaxew by enlarging spray coverage area.
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