Numerical analysis of flow field for natural ventilation system of the main building in one thermal power plant determined by using engineering design method has been carried out by adopting computational fluid dynamics (CFD)

pointing out the affecting factors of thermal compression differecne between both sides of ventilation opening

i.e. resistance distribution in the process of air flow

and the air temperature field distribution inside the building

have to be considered in the natural ventilation design of the main building

hence

a necessary correction having to be made for the thermal compression value.