A 3D CFD model of a natural draft wet-cooling tower

• Autorzy: Klimanek A. , Białecki R.
• Języki publikacji: EN

Abstrakty

EN

A 3D CFD model of a natural draft wet-cooling tower is presented in this paper. The model encompasses both the interior of the tower as well as the surrounding air. The developed CFD model is supplied with a low dimensional representation of the heat and mass exchanger, whose purpose is to determine the heat and mass rejected from the cooled water to the air. The representation is based on an original technique called the proper orthogonal decomposition. Due to the large scale differences, application of a low-dimensional heat and mass transfer model allowed reducing the computational time and accurately predict the heat and mass rejection effects. The Euler-Euler multiphase model was used to calculate the flow, heat and mass transfer in the rain zone. The model can be used in both, design computations as well as performance tests of natural draft wet-cooling towers. The effects of wind on the cooling tower can be taken into account. The CFD model was developed using the commercial code Fluent.

Słowa kluczowe

EN

CFD; cooling tower; heat transfer; mass transfer; Multiphase flowm; proper orthogonal decomposition

PL

CFD; chłodnia kominowa; POD; przepływ ciepła; przepływy międzyfazowe; wymiana masy

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2009
• Tom: Vol. 30, no. 4
• Strony: 119--132
• Opis fizyczny: Bibliogr. 14 poz.,Rys., tab., wz.,

Twórcy

autor

Klimanek A.

autor

Białecki R.

• Silesian University of Technology, Institute of Thermal Technology, Konarskiego 22, 44-100 Gliwice, Poland,

Bibliografia

• [1] KLIMANEK A., OSTROWSKI Z., BIAŁECKI R.A.: Modelling of heat and mass flow in a natural draft wet-cooling tower , Proc. of the Symp. of Heat and Mass Transfer, Koszalin-Darłówek, 2007, 41-48 (in Polish).
• [2] KLIMANEK A., BIAŁECKI R.A.: Modelling of flow, heat and mass transfer in natural draught wet-cooling towers, XVI Medzinarodna Vdecka Konferencja - Aplikacia Experimentalnych a Numerickych Metod v Mechanike Tekucin, Zilina-Terchova, Slovakia, 2008, Vol. 1, 73-78.
• [3] KLIMANEK A., BIAŁECKI R.A.: On a numerical model of a natural draught wet-cooling tower, Archives of Thermodynamics, 29(2008), No. 4, 63-72.
• [4] KLIMANEK A., OSTROWSKI Z., BIAŁECKI R.A.: Reduced order model of heat and mass transfer in wet cooling tower fills, Proc. of ECOS 2008. Cracow-Gliwice, Poland, 2008, Vol. 1, 361-370.
• [5] KLIMANEK A., BIAŁECKI R.A.: Solution of heat and mass transfer in counterflow wet-cooling tower fills, Int. Communications in Heat and Mass Transfer, 36(2009), No. 6, 547-553.
• [6] KRÄTZIG W.B., MONTAG U., BUSCH D., HARTEB R.: New natural draft cooling tower of 200 m of height, Engineering Structures, 24(2002), No. 12, 1509-1521.
• [7] RADOSAVLJEVIC D.: The numerical simulation of direct-contact natural-draught cooling tower performance under influence of cross-wind, Doctoral thesis, Imperial College of Science, Technology and Medicine, London 1990.
• [8] WILLIAMSON N., ARMFIELD S., BEHNIA M.: Numerical simulation of flow in a natural draft wet cooling tower - the effect of radial thermofluid fields, Applied Thermal Engineering, 28(2008), 178-189.
• [9] AL-WAKED R., BEHNIA M.: Enhancing performance of wet cooling towers, Energy Conversion and Management, 48(2007), 2638-2648.
• [10] KLOPPERS J.C: A critical evaluation and refinement of the performance prediction of wet-cooling towers, PhD Thesis, Department of Mechanical Engineering, University of Stellenbosch, South Africa, 2003.
• [11] STECHMAN A.: Procedure for operation of cooling towers in winter conditions, PhD Thesis, Politechnika Slaska w Gliwicach, Gliwice 2006 (in Polish).
• [12] RANZ W.E., MARSHALL W.R.: Evaporation from drops, Part I, Chemical Engineering Progress, 48(1952), No. 3, 141-146.
• [13] Fluent Inc, Fluent 6.3 User's Guide, Fluent Inc, 2006.
• [14] KLOPPERS J.C. AND KRÖGER D.G.: Cooling tower performance evaluation: Merkel, Poppe, and e-ntu methods of analysis, J. of Engng. for Gas Turbines and Power, 127(2005), No. 1, 1-7.