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Title: Numerical study of the thermal-hydraulic performance of evaporative natural draft cooling towers
Authors: Hawlader, M.N.A. 
Liu, B.M.
Keywords: Cooling tower
Distributions of flow
Heat and mass transfer
Hourly performance
Mathematical and physical models
Non-spherical effects
Numerical study
Issue Date: Jan-2002
Citation: Hawlader, M.N.A., Liu, B.M. (2002-01). Numerical study of the thermal-hydraulic performance of evaporative natural draft cooling towers. Applied Thermal Engineering 22 (1) : 41-59. ScholarBank@NUS Repository.
Abstract: In this paper, the mathematical and physical models governing the flow, mass and heat energy of moist have been set up for an evaporative natural draft cooling tower. The models consider the effect of non-spherical shape of water drops on the flow, heat and mass transfer. Experimental data has been adopted to validate the numerical scheme. Average difference between the measured and the predicted outlet water temperature is 0.26°C. Distributions of the velocity components of the moist air, density, pressure, enthalpy and moisture content, the water temperature and its mass flux have been predicted. The simulation shows that some recirculation exits under the lower edge of the shell, where the air enthalpy, temperature, humidity and moisture content are higher, but the density is lower. The simulation also proves that the main transfer processes take place in the fill region where the percentage of latent heat transfer is predicted as 83%. However, about 90% of the heat energy is transferred via evaporation in the rain region although the total heat transfer rate there is very small compared to the fill region. Hourly performance of a natural draft cooling tower under the meteorological condition of Singapore has also been predicted. © 2001 Elsevier Science Ltd. All rights reserved.
Source Title: Applied Thermal Engineering
ISSN: 13594311
DOI: 10.1016/S1359-4311(01)00065-5
Appears in Collections:Staff Publications

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