Air-cooling island platform in power station contains arrays of air-cooling cells with two direct air-cooling power units

and the flow and heat dissipation behaviors of air-cooling cells in each direction interacting with each other will have a direct and dissimilar effect on thermal economy of operation of the two units. Therefore

the thermodynamic model of direct air-cooling unit and the three-dimensional flow and heat dissipation numerical model of air-cooling island are coupled to study the correlation between the flow and heat dissipation behavior of each air-cooling cell

the cooling performances of the air-cooling cell groups

and the operating thermal economy of the two units in different ambient wind directions and wind speeds. The results show that

in any wind direction

the flow and heat dissipation behavior of the air-cooling cells on the windward side are poor and deteriorate rapidly

while the downstream air-cooling cells perform well and are less affected by the ambient wind. The phenomenon of hot wind reflux tends to occur on both sides and the windward side of the air-cooling cells. The cooling capacities of the two air-cooling cell groups in wind direction of-90° are equal and the worst

while the cooling performances of the two air-cooling cell groups in wind direction of 0° are one high and one low

and the downstream one is better than the upstream one. With the increase of wind speed in –90° wind direction from 0 m/s to 12 m/s

at 100% THA load

the power generation efficiency of the two units decreases by 2.46% and the weighted coal consumption increases by 15.91 g/(kW·h)

while at 30% THA load

the efficiency decreases by 1.24% and the weighted coal consumption increases by 8.65 g/(kW·h). The overall operating economies of the two units in wind direction of 0° and 90° are similar

and the sensitivity of the thermal economic parameters of the two units to the change of the wind speed at the low load is also relatively small.