Numerical simulation of air-cooled condenser performance under different windy condition

A reliable and economic power production in thermal power plants depends highly upon the optimum selection of site equipment and their best possible arrangement. One of the most significant systems which play a crucial role in power production is the cooling system. Therefore understanding and predicting the factors or mechanisms that can reduce the performance of an ACC is essential. The hot air recirculation (HAR)is a common trouble in the air-cooled power units. HAR is affected by the arrangement of the air-cooled island, the environmental condition around the direct air-cooled system, wind direction and wind speed. Results show that the wind causes an air temperature increase at the fan inlet due to hot air recirculation, resulting in the deterioration of the heat transfer performance. At the wind speed 3 m/s the plume rise angle (angle betweenplume and vertical) is approximately 30°, 45° at 6 m/s and 55° at 9 m/s. The hot air recirculation increases with the increment of velocity speed. The hot air recirculation is the main factor responsible for the reduction of heat rejection rate. The peak value of the HAR occurs at 9 m/s and wind direction angle α=90°.

کلیدواژه ها:

ACC ، HAR ، wind ، performance