Performance Forecast of Air-Cooled Steam Condenser under Windy Conditions
Publication: Journal of Energy Engineering
Volume 142, Issue 1
Abstract
Ambient wind has adverse impacts on the thermal-flow performances of air-cooled steam condensers (ACSCs). It is useful to understand the mechanisms of such influences so as to improve and optimize the performance of condensers. The flow fields around an ACSC at different wind speeds and directions are numerically investigated in this paper. It is found that the negative pressure region under the ACSC platform results in volumetric effectiveness reduction of the windward fans with increasing wind speed, and hot air recirculation or reversed flow in condenser cells causes a fan inlet air temperature increase. Under windy conditions, if a main building blockage effect exists, either hot air recirculation will occur, or else reversed flow may arise. The negative pressure region under the platform plays a leading role in the heat transfer effectiveness reduction. From the scale of condenser cell instead of the whole ACSC, stable backpressures corresponding to the windy conditions are forecasted by the combination of the effectiveness-NTU method and the numerical method, which makes the model closed to the true status. The increasing amplitudes of the backpressures reach, respectively, 14.3, 15.4, and 6.4 kPa at , and west-northwest wind direction as the wind speed increases from 0 to .
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Acknowledgments
This research is supported by the Fundamental Research Funds for the Central Universities (No. 09MG34).
References
Bredell, J. R., Kröger, D. G., and Thiart, G. D. (2006). “Numerical investigation of fan performance in a forced draft air-cooled steam condenser.” Appl. Therm. Eng., 26(8-9), 846–852.
Ding, E. M. (1992). Air-cooling technology in power plant, Waterpower Press, Beijing.
Duvenhage, K., and Kröger, D. G. (1996). “The influence of wind on the performance of forced draught air-cooled heat exchangers.” J. Wind Eng. Ind. Aerod., 62(2-3), 259–277.
Gao, X. F., Zhang, C. W., and Wei, J. J. (2010). “Performance predication of an improved air-cooled steam condenser with deflector under strong wind.” Appl. Therm. Eng., 30(17-18), 2663–2669.
Gu, Z. F., Chen, X. R., and Lubitz, W. (2007). “Wind tunnel simulation of exhaust recirculation in an air-cooling system at a large power plant.” Int. J. Therm. Sci., 46(3), 308–317.
He, W., Han, D., and Yue, C. (2014). “Influence mechanism from the inner walkway on the performance of an air-cooled power plant.” J. Energy Eng., 04014052.
Liu, P. Q., Duan, H. S., and Zhao, W. L. (2009). “Numerical investigation of hot air recirculation of air-cooled condensers at a large power plant.” Appl. Therm. Eng., 29(10), 1927–1934.
Maulbetsch, J. S., DiFilippo, M. N., and O’Hagan, J. (2011). “Effects of wind on air-cooled condenser performance.” Proc., IMECE 2011, Denver, CO.
Meyer, C. J. (2005). “Numerical investigation of the effect of inlet flow distortions on forced draught air-cooled heat exchanger performance.” Appl. Therm. Eng., 25(11-12), 1634–1649.
Meyer, C. J., and Kröger, D. G. (2004). “Numerical investigation of the effect of fan performance on forced draught air-cooled heat exchanger plenum chamber aerodynamic behavior.” Appl. Therm. Eng., 24(2-3), 359–371.
Owen, M. T. F. (2010). “Numerical investigation of air-cooled steam condenser performance under windy conditions.” M.S. thesis, Univ. of Stellenbosch, Stellenbosch, South Africa.
Owen, M. T. F., and Kröger, D. G. (2010). “The effect of screens on air-cooled steam condenser performance under windy conditions.” Appl. Therm. Eng., 30(16), 2610–2615.
Owen, M. T. F., and Kröger, D. G. (2011). “An investigation of air-cooled steam condenser performance under windy conditions using computational fluid dynamics.” J. Eng. Gas Turbines Power, 133(6), 604502.
Salta, C. A., and Kröger, D. G. (1995). “Effect of inlet flow distortions on fan performance in forced draft air-cooled heat exchangers.” Heat Recovery Syst. and CHP, 15(6), 555–561.
Tao, W. Q. (2002). Numerical Heat Transfer, Xi’an Jiaotong University Press, Xi’an, China.
van Rooyen, J. A., and Kröger, D. G. (2008). “Performance trends of an air-cooled steam condenser under windy conditions.” J. Eng. Gas Turbines Power, 130(2), 023006.
Versteeg, H. K., and Malalasekera, W. (2007). An introduction to computational fluid dynamics: The finite volume method, 2nd Ed., Pearson Education Limited, London.
Wang, C. C., Chi, K. Y., and Chang, C. J. (2000). “Heat transfer and friction characteristics of plain fin-and-tube heat exchangers. Part II: Correlation.” Int. J. Heat Mass Transf., 43(15), 2693–2700.
Wang, Q. W., Zhan, D. J., and Zeng, M. (2008). “CFD simulation on a thermal power plant with air-cooled heat exchanger system in north China.” Eng. Computations, 25(4), 342–365.
Yang, L. J., Du, X. Z., and Yang, Y. P. (2010). “Measures against the adverse impact of natural wind on air-cooled condensers in power plant.” Sci. China Tech. Sci., 53(5), 1320–1327.
Yang, L. J., Du, X. Z., and Yang, Y. P. (2011). “Influences of wind-break wall configurations upon flow and heat transfer characteristics of air-cooled condensers in a power plant.” Int. J. Therm. Sci., 50(10), 2050–2061.
Yang, L. J., Du, X. Z., and Yang, Y. P. (2012a). “Improvement of thermal performance for air-cooled condensers by using flow guiding device.” J. Enhanced Heat Transfer, 19(1), 63–74.
Yang, L. J., Wang, M. H., and Du, X. Z. (2012b). “Trapezoidal array of air-cooled condensers to restrain the adverse impacts of ambient winds in a power plant.” Appl. Energy, 99, 402–413.
Zhang, X. L., Wang, J. P., and Chen, H. P. (2012). “Calculation model of exhaust pressure of direct air-cooled unit considering the effect of environmental wind.” Proc. CSEE, 32(23), 40–47.
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Published In
Journal of Energy Engineering
Volume 142 • Issue 1 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Nov 12, 2014
Accepted: Feb 6, 2015
Published online: Apr 17, 2015
Discussion open until: Sep 17, 2015
Published in print: Mar 1, 2016
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