ARTICLE:

• Design of curative devices to improve the wind-on Performance of Cooling Towers  download article

Jafar Madadnia
University of Technology, Sydney, P O Box 123, Broadway, NSW 2007, Australia

M. Lamic
University of Technology, Sydney, NSW 2007, Australia

Ghulam Amur
Faculty of Engineering, University of Technology Sydney, P.O Box 123 Broadway 2007 Australia

H. Koosha
University of Technology, Sydney, NSW 2007, Australia

ABSTRACT

Environmental cross winds usually distort the uniform distributions of both air flow and air resistance at inlet to cooling towers and subsequently causes hot areas in the tower due to insufficient local cooling of water by air. Curative devices such as windbreaks are developed to ameliorate the performance of the power station cooling tower.
At present experimental investigation, effects of curative devices on performance of a 1/1000 scaled isothermal model of a 660MW wet cooling tower were quantified using intake dynamic pressure losses and total pressure losses. Dimensional similitude was used in the isothermal modelling of the wet cooling tower. A dimensionless pressure loss coefficient in the tower is defined as the performance indicator, as the ratio of total pressure drop in the heat exchanger region (i.e. combined packing and rain zone) of the tower, to dynamic pressure in the tower. Over twenty three curative devices were designed and manufactured and their effects on the pressure loss coefficient of the 1/1000-scaled model were quantified. The top three most efficient curative devices are selected and presented in this paper.
The results are shown as the percentage increase in performance by a curative device, plotted against velocity ratio Vr (wind to tower). Pressure drop coefficient with no curative device was selected as the base condition, and compared with the presence of curative devices. Up to 33% improvement was noticed in the pressure loss coefficient. The design of three typical curative devices was reported here.

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