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Advances in Heat Transfer Engineering

ISSN:
1-56700-198-1 (Print)

NUMERICAL MODELLING OF TRANSFER PHENOMENA IN NATURAL DRAFT COOLING TOWERS

Maja Rotar
Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenija

Bostjan Drobnic
Faculty of Mechanical Engineering, Askerceva 6, 1000 Ljubljana, Slovenia

Wladyslaw Nowak
Department of Heat Engineering, West-Pomeranian University of Technology al. Piastow 17, PL 70-310 Szczecin, Poland

Brane Sirok
Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, P.O. Box 394, SI - 1000 Ljubljana, Slovenia

Bozin Donevski
ASME Member Faculty of Technical Sciences University "St Clement Ohridski" Bitola, 7000, p.o. box 99, Macedonia

Abstract

Most analyses of cooling tower operation performed so far are based on calculation of characteristic number NTU [1, 2]. The towers themselves are considered as "black-boxes" and their operation is only the evaluated as "good" or "bad". To locate particular regions of cooling tower where the operation is unsatisfactory, additional measurements are needed. These include temperatures and velocities of the airflow over the entire surface above drift eliminators. Measurements show non-uniformity of heat transfer rate and airflow resistance over the cooling tower area. To determine influence of these non-uniformities to the airflow over the entire cooling tower height numerical simulations of airflow through a cooling tower were performed. Commercial software was used for the simulations. Additional models based on measurement results were included to describe heat transfer and airflow resistance through fill system. Numerical simulation gives temperature and velocity distribution within the entire cooling tower.