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Abstract
The study aims at analytically determining the optimum conditions for a counter flow forced draft cooling tower taking the minimization of the operating cost as an objective. First a mathematical model that effectively describes the counter flow cooling tower was selected and the programming was carried out with MATLAB software. Then a parametric analysis was conducted in which the effect of parameters: air and water mass flow rate(s), inlet water temperature was investigated on performance parameters. Finally different case studies were examined in order to select optimum conditions which resulted in minimizing the operating cost