Configuration of a Natural Exhaust Ventilation System with Standard Air Rates

For a long time, the calculation of exhaust ventilation systems was based on the assumption that there is no aerodynamic drag from the outside air to the exhaust grate. This statement was grounded on a large area of the window cracks. The new «dense» windows force designers to pay attention to the reduction of real air rates in comparison with the normalized ones. Currently, in order to save heat for heating the inflow outdoor air, it is advisable to consider that ventilation should provide a normalized air exchange only at the time when it is required by the consumer. In order to pass the required inflow air rate during the entire year when the ventilation system is used, the supply opening must be adjustable. Calculations of a residential 18-storey building air mode have shown that the best condition for regulating and providing sufficient space for the passage of the outdoor air is enabled by a folding window sash with an adjustable opening degree. Supply valves lead to an improper operation of the ventilation system, as they create a large aerodynamic drag and do not work properly even with increased cross-sections of the ventilation piping air ducts, especially on the upper floors.

E.G. MALYAVINA¹, Candidate of Science (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
K.M. AGAKHANOVA¹, Master of Science (Engineering);
N.P. UMNYAKOVA², Doctor of Science (Engineering)

¹ National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)
² Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)

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