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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2011002707
pages 63-74

IMPROVEMENT OF THERMAL PERFORMANCE FOR AIR-COOLED CONDENSERS BY USING FLOW GUIDING DEVICE

Lijun Yang
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China
Xiaoze Du
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University), Ministry of Education, Beijing 102206, China; School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Yongping Yang
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China

RÉSUMÉ

Ambient winds may result in poor fan performance and exhaust plume recirculation of air-cooled condensers in a power plant. The adverse impacts of winds can be restrained by altering the flow patterns of the cooling air. A novel method which uses a flow guiding device installed below the platform is investigated in this paper. The physical and mathematical models for air-side fluid and heat flows in air-cooled condensers with a flow guiding device in a representative 2 × 600 MW direct dry cooling power plant are presented by introducing a radiator model to the fin-tube bundles. The flow rates, inlet air temperatures, and heat transfer rates of the air-cooled condensers as a whole and of the individual condenser cells are obtained and compared by using computational fluid dynamic (CFD) simulation. The results show that both the flow and heat transfer rates of the air-cooled condensers as a whole increase with the addition of the flow guiding device. For the upwind condenser cells that face the ambient winds, the flow and heat transfer rates vary widely owing to the flow field leading of the ambient winds by the flow guiding device. It is useful for the optimal design and operation of air-cooled condensers to effectively organize the flow fields of cooling air by various ways.


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