Determination of natural draft wet-cooling tower loss coefficient

Abstract

Based on the characteristics of the natural draft wet-cooling tower represented by Merkel number dependence on gas to liquid ratio and known parameters of flowing water is determined tower loss coefficient. The simple algebraic draft equation has been used. The density above the fill zone is predicted both by the assumption of saturated air above the fill zone and by using energy equation, where the change in water mass flow rate is taken into account. Results are compared with the more general quasi-one-dimensional model based on the system of four partial differential equations describing moist air flow. The system of equations for moist air flow is coupled with two ordinary differential equations describing heat and mass transfer in the fill zone.