Buoyancy-driven displacement natural ventilation in a single-zone building with three-level openings

Summary

Obtains theoretical solutions for thermal stratification and airflow rates for buoyancy -driven displacement ventilation in a single-zone buildings with three-level openings. Identifies three displacement natural ventilation modes - 1) middle opening (MO) below the stratification interface, 2) MO above the stratification interface with inflow through the MO, 3) MO above the stratification interface with outflow through the MO. Finds that for a wide range of building geometries, the ventilation mode is uniquely determined by the building geometry and the type of buoyancy sources. Notes there are certain ranges of building geometry for which displacement ventilation may occur with either mode 1) or mode 2), depending on initial conditions. States the significance of these findings is that numerical simulation packages for predicting displacement natural ventilation of buildings need to have the ability to cope with multiple solutions. Also finds that for a given ventilation mode, the location of the stratification interface is a function of the geometrical parameters only and is independent of the strength of buoyancy sources. Provides some general guidelines for optimising natural ventilation in a building with three-level openings.

Primary Author(s): Chen Z D, Li Y

Source: Bldg. Environ., March 2002, vol.37, no.3, 295-303, 7 figs, 1 tab, 7 refs.

             BSRIA Abstract Doc 000103042 Abs 20020213

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