Comparison between Ventilation Modes of Large Direct Air-Cooling System

In this paper, a new hybrid ventilation system is introduced to improve the performance of the direct air-cooling systems. Two 1 000-MW direct air-cooling units are taken as the example to compare the hybrid ventilation cooling system with the mechanical and natural ventilation direct air-cooling systems with numerical simulation method. The back pressure variation obtained under typical summer wind speed conditions indicates that the hybrid ventilation direct air-cooling system has better operational economy in light winds and better security performance in strong winds than the mechanical and natural ventilation direct air-cooling systems. Therefore, it is very suitable for using in the areas of bad wind conditions.