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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Numerical Simulation of Heat and Mass Transfer Processes in Air-Cooled Condenser

Get access (open in a dialog) DOI: 10.1615/IHTC15.cds.009536
pages 617-630

Resumo

The goals of this study are to develop a mathematical model and provide a numerical analysis of the hydrodynamics and heat and mass transfer processes in air condensers for steam–gas, geothermal and heat recovery plants. A two-level porous media model was developed for the numerical analysis of the processes in the air condenser. At the macro level, the condenser is represented by a porous matrix, which is defined by its porosity, permeability etc. Multidimensional conservation equations are used to model the cooling airflow and heat transfer in the tube bundle. The condensation of steam from the steam-air mixture inside each row of inclined tubes is modelled at the micro level using one-dimensional models. The non-uniform distribution of the flow rate of the steam–gas mixture through the rows of tubes is implemented using a specially developed algorithm that takes into account the local hydraulic resistance at the entrance of the tube, the pressure drop inside the tubes, and the characteristics of the air removal equipment. The influence of the main operating conditions on the characteristics of air-cooled condensers with several numbers of rows in the tube bundle was analysed.