Influence of architecture condition on natural ventilation efficiency in welding workshop of shipyards

Based on an actual welding workshop of largescale shipyard, discusses the influence of architecture conditions on natural ventilation efficiency by CFD simulation. Concludes that it has lower ventilation efficiency under adverse climate conditions, that the change in opening size of doors, location of side windows and layout of roof ventilators can not improve ventilation efficiency markedly, that the ratio of the area taken by roof ventilators to that of the roof up to 45%~60% can reach satisfactory ventilation efficiency and indoor hygiene conditions, and that the building orientation is an important influencing factor on natural ventilation efficiency and should be considered sufficiently in design.