The Heller towers are the most common types Power plants cooling towers، where its efficiency is  is very sensitive to wind. according to the general approach of  designer of cooling systems، Direct dry cooling (ACC) systems are more popular today in power plants located in arid areas. In Heller towers due to the empty space inside them, in this study, instead of proposing the replacement of ACC towers, the hybrid model is proposed، where steam is Directly gonig into the ACC radiators without fan installed inside the Heller Tower، and condenses with a natural suction mechanism. The flow around the proposed model are investigated in three dimensions in two cases of no wind and no wind at 8 different  wind speeds with the assumption of incompressibility flow by the continuity, momentum, energy and turbulence equations. The hybrid tower  performance has been compared with Fars power plant cooling system and it has been shown that the proposed cooling tower has performed 25% better than the Fars cooling system in no wind condition. It has also performed better in wind conditions in different speeds except speeds above 12.5 m / s at a horizontal

array of ACCs..A vertical array of ACCs performance has been better than the horizontal array.Therefore, the hybrid model with vertical array of ACCs can be efficient to replace the cooling system of Fars power plant.