Natural ventilation of a building with heating at multiple levels

Article English OPEN
Livermore, S. R. ; Woods, A. W.
  • Subject: sub-99

This paper describes the theoretical and experimental modelling of a room with low and high level openings and distributed heating at\ud multiple levels. By elevating a proportion of the heat load from the base, the temperature of the space will becomes stratified.\ud Consequently, the height of neutral buoyancy is raised and is a function not only of the geometric areas of upper and lower openings but\ud also of the ratio of heat fluxes and the heights over which they apply. If an intermediate opening is now introduced, air will flow outwards\ud if the height of neutral buoyancy is below the opening and inwards if it is above. When the intermediate opening acts as an inflow vent,\ud two regimes may occur. Firstly, if the magnitude of the elevated heat flux is sufficient to warm up the incoming cool air the space will\ud remain stratified. However, if it is insufficient the incoming air will descend to the base and the whole space will become well mixed.\ud Quantitative models have been developed to describe the conditions under which each regime occurs and each has been validated using\ud small scale analogue experiments.
  • References (11)
    11 references, page 1 of 2

    [1] Fitzgerald SD, Woods AW. Natural ventilation of a room with vents at multiple levels. Building and Environment 2004;39:505-21.

    [2] Chen ZD, Li Y. Buoyancy-driven displacement natural ventilation in a single-zone building with three level openings. Building and Environment 2002;37:295-303.

    [3] Linden PF, Cooper P. Multiple sources of buoyancy in a naturally ventilated enclosure. Journal of Fluid Mechanics 1996;311:177-92.

    [4] Gladstone C, Woods AW. On buoyancy-driven natural ventilation of a room with a heated floor. Journal of Fluid Mechanics 2001;441: 293-314.

    [5] Turner JS. Buoyancy effects in fluids. Cambridge University Press; 1973.

    [6] Linden PF. The fluid mechanics of natural ventilation. Annual Review of Fluid Mechanics 1999;31:201-38.

    [7] Anderson KT. Theory for natural ventilation by thermal buoyancy in one zone with uniform temperature. Building and Environment 2003;38:1281-9.

    [8] Etheridge D, Sandberg M. Building ventilation, theory and measurement. New York: Wiley; 1996.

    [9] Douglas JF, Gasiorek JM, Swaffield JA. Fluid mechanics. New York: Longman Scientific and Technical; 1986.

    [10] Livermore SR, Woods AW. Natural ventilation of multiple storey buildings: the use of stacks for secondary ventilation. Building and Environment 2005; in press, doi:10.1016/j.buildenv.2005.05.037.

  • Metrics
    No metrics available
Share - Bookmark