This paper presents that the cooling towers are the most valuable equipment in industries usually to dissipate residual process heat loads at a very reasonable cost. Apart from providing inexpensive and excellent heat transfer media they play an essential role to lower the 1heat rate or increase the efficiency of the complex within certain temperature limits. As world’s population & industry is growing day by day energy conservation has become as necessary as other super essential priorities. Hence Cooling Towers are designed to conserve & re-use water intakes through recirculation in order to remove process heat with minimum water losses