The Effects of Environment Wind on Heat Transfer Performance of Direct Air Cooled Island and its Improvements

Abstract:

Using a CFD software, the numerical simulation of a 2×300MW direct air-cooled unit is done by multi-stage modeling method. the effect of the environmental wind on the heat-exchanging performance of the air-cooling island is analyzed by numerical simulation. The effects of different wind velocities and directions on exterior flow field and heat-exchanging efficiency are analyzed. The reasons of hot air recirculation and the decrease of the fans’ output are found. The heat transfer performance of air-cooled island is affected after the installation of windproof net. The result shows that the form of low-pressure area is the main reason for the hot air reflow and the decreace of the fan’s output; An improved flow field can be got after installing the windproof net. The volumetric effectiveness can be increased by 8.5% at a wind speed of 9 m/s.

• Periodical: Advanced Materials Research (Volumes 753-755)
• Pages: 2752-2756
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.753-755.2752
• Online since: August 2013
• Authors: Pei Gao, Xue Lei Zhang, Xin Wei Yu
• Keywords: Air-Cooled Condenser Cell, Air-Cooling Island, Numerical Simulation, Windproof Net, Windy Conditions

References

[1] Zhou Lan xin, Bai Zhong hua, Li Wei hua, et al. Numerical simulation for the effects of natural wind on heat exchange efficiency of air-cooled condenser[J]. Journal of Power Engineering, 2008, 28(1): 104-107.

[2] Zhao Wan li, Liu Pei qing. Experimental researches of the effect of environmental wind on thermal recirculation under the tower of direct air cooled system[J]. Journal of Power Engineering, 2008, 28(3), 390-394.

[3] Zhou Lan xin, Li Jian bo, Li Wei hua, et al. Numerical simulation of direct air cooling units' condenser added lower wind break[J]. Journal of Power Engineering, 2008, 28(5): 744-747.

[4] Zhang Xue lei , Wang Jin ping . A Calculation model of exhaust pressure of direct air-cooled units considering the effect of environmental wind [J] . Proceedings of the CSEE. 2012，32(23): 40-47.

[5] Yang Jian guo , Liu Da , Zhang Zhao ying, et al . Effects of using wind guiding nets to improve prevailing ambient wind on direct air-cooled Condensers[J] . Proceedings of the CSEE. 2012, 32(2): 1-8.

[6] C.J. Meyer, D. G Kroöger. Numerical investigation of the effect of fan performance on forced draught air-cooled heat exchanger plenum chamber aerodynamic behaviour. Applied Thermal Engineering. 2004(24): 359-371.

DOI: 10.1016/j.applthermaleng.2003.08.009

[7] K. Duvenhage, D. G Kroöger. The influence of wind on the performance of forced draught air-cooled heat exchangers. Journal of Wind Engineering and Industrial Aerodynamics 62 (1996) 259-277.

DOI: 10.1016/s0167-6105(96)00082-7

[8] Cheol Woo Park and Sang Joon Lee. The effects of a bottom gap and non-uniform porosity in a wind fence on the surface pressure of a triangular prism located behind the fence, Journal of Wind Engineering and Industrial Aerodynamics, 2001, 89(13): 1137-1154.

DOI: 10.1016/s0167-6105(01)00105-2

[9] ZhifuGu, Hui Li Etc. Wind tunnel simulation of exhaust re-circulation in an air-cooling system at a large power plant [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2005, 93: 509-520.

DOI: 10.1016/j.jweia.2005.05.001

[10] Van Rooyen J A, Kröger D G. Performance trends of an air-cooled Steam condenser under windy conditions[J]. Journal of engineering for gas turbines and power, 2008, 130(2): 023006.

DOI: 10.1115/1.2771567

[11] Bredell J R . Numerical investigation of fan performance in a forced draft air-cooled steam condenser[D]. Stellenbosch: Stellenbosch University , (2005).

DOI: 10.1016/j.applthermaleng.2005.09.020

[12] Ding Zhen yu , Chen Wei , Qiao Wei , et al . Windshield on the heat transfer efficiency of direct air cooled island and the windshield optimization[J] . Turbine Technology, 2011, 53(10); 447-451.