Dry cooling towers with natural intake are of the most typical towers in the existing plants in low-water places. One of the problems regarding the performance of such towers is that of the effecting of the environmental conditions on their performance. The most effective factor is the environmental winds around the towers. At the present time the governing equations on the flow fluid and the temperature in three-dimensional areas around and inside the tower are segregated and solved with the use of the finite-volume method. Fluid stream inside and around these towers in three different conditions are: natural intake of the air inside the dry cooling tower, forced flow of the air around the dry cooling tower and also the effect of the internal walls inserted inside the tower that has been modeled to increase the efficiency of the dry cooling tower when the environmental winds blows. The results of this research suggests that although the internal walls set the flow of the air through the dry cooling tower and eliminates the asymmetric distribution of the air pressure around and inside the dry cooling tower which was caused due to the environmental winds and makes an almost steady pressure around and inside the dry cooling tower, it doesn’t affect highly on the efficiency of the dry cooling tower at the time of flowing of the environmental winds. At the present time, the heat exchangers haven't been modeled like the working model so that the heat exchanger model of the Fluid software has been used. Therefore, the number of used elements will be decreased obviously. In addition, it will lead to the exact analysis of the heat transfer between the air and the water. It will also correctly and carefully analyze the pressure drop created by the air passing over the heat exchangers. In this research the temperature of the output water of every heat exchanger is computed and presented in all conditions. Keywords: Dry cooling tower, Internal walls, heat exchanger model, environmental winds