The Effects Of Environment Wind On Heat Transfer Of Direct Air-cooled Condenser And Improving Measures

Some2×300MW direct air-cooled condenser was taken as an example in this paperto study the effect of environmental wind on the operation of direct air-cooled units byusing FLUENT software. The numerical analysis models of the air cooling island and theair-cooled element were built. The effects of environmental wind on heat-exchangingperformance of direct air-cooled condenser were analyzed, and the dominant factor ofcausing the decrease of direct air-cooled condenser performance under windy conditionwas obtained. The effects of installing wind-break net under wind-break wall of the aircooling island on direct air-cooled condenser heat-exchanging performance wereanalyzed. The three wind-break net arrangement patterns including the box type, internalcross type and internal “#” type were proposed. The results are as follows: The inlet windtemperature of the air-cooled element located in the edge of air cooling platform isgreatly affected by environmental wind, which is because of the effects of hot airrecirculation and down draft. The air inflow of the air-cooled element located in thewindward side of air cooling platform is greatly affected by environmental wind, whichis because the negative pressure zone reduces the performance of the fan. The dominantfactor that decreases the direct air-cooled condenser performance is the reduction of theair inflow caused by the decrease of air-cooled element performance.Wind-break net canimprove the effects of environmental wind on direct air-cooled condenserheat-exchanging performance. Under6m/s dominant wind, the air inflow of the coolingair fan is increased by4.6%. To the three arrangement patterns, the internal crossstructure is the optimal wind-break net arrangement pattern.