Abstract
The article deals with the development of CFD model of natural draft wet-cooling tower flow. The physical phenomena taking place within a natural draft wet cooling tower are described by the system of conservation law equations along with additional equations. The heat and mass transfer in the counterflow wet-cooling tower fill are described by model [1] which is based on the system of ordinary differential equations. Utilization of model [1] of the fill allows us to apply commonly measured fill characteristics as shown by [2].The boundary value problem resulting from the fill model is solved separately. The system of conservation law equations is interlinked with the system of ordinary differential equations describing the phenomena occurring in the counterflow wet-cooling tower fill via heat and mass sources and via boundary conditions. The concept of numerical solution is presented for the quasi one dimensional model of natural draft wet-cooling tower flow. The simulation results are shown.
Highlights
Natural draft cooling towers are widely used in industry especially in large power plants and in chemical industry
For a description of the cooling tower flow, let us consider the humid air as a mixture of dry air and water vapour
Due to the complexity of two phase flow occurring in the wet-cooling tower fill the one dimensional models of heat and mass transfer are used
Summary
Natural draft cooling towers are widely used in industry especially in large power plants and in chemical industry. The aim of cooling tower is to transfer waste heat from cooled water into the atmosphere. The air which is flowing through the cooling tower is warmed up and its humidity is increasing which leads to cooling of flowing water. In the channels of counterflow wet-cooling tower fill of film type water flows vertically down through the fill as a liquid film. Air is driven by a tower draft and flows vertically in the opposite direction. Heat and mass transfer occurs at the water and air interface. Evaporation and convective heat transfer cool the water, what leads to increase of air humidity and temperature. As an example of CFD models of natural draft cooling tower flow can be mentioned e.g. As an example of CFD models of natural draft cooling tower flow can be mentioned e.g. [5] and commercial code based [6]
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