Effect of the flow leading slats obliquity on the thermal performance of air-cooled condensers in a power plant

Abstract

Paper presented at the 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Mauritius, 11-13 July, 2011.Ambient winds may bring on poor fan performance and deteriorated heat rejection of the air-cooled condensers in a power plant. The disadvantageous wind impacts can be weakened thanks to the flow field leading of the wind. By introducing a radiator model to the fin-tube bundles, the airside fluid and heat flow in air-cooled condensers with a flow guiding device in a representative 2 × 600MW direct dry cooling power plant are modeled and calculated. The flow rate and heat rejection of the individual condenser cells and the aircooled condensers with flow guiding devices at different slat obliquities are obtained and compared. The results show that the flow rate and heat rejection of the air-cooled condensers both increase owing to the setup of the flow guiding device. The low flow guiding slats obliquity is superior to the high one for the thermo-flow performances. For the upwind condenser cells, the flow and heat transfer rates vary widely due to the flow field leading of the ambient winds by the flow guiding device especially at the lowered obliquity. It can be of use for the optimal design and operation of air-cooled condensers in a power plant.