Gas build-up within a single building volume — comparison of measurements with both CFD and simple zone modelling

Autor: R.P. Hoxey, A. Mercer, D.M. Deaves, C.R. Boon, S. Gilham
Rok vydání: 1997
Předmět:
Zdroj: Journal of Hazardous Materials. 53:93-114
ISSN: 0304-3894
DOI: 10.1016/s0304-3894(96)01836-5
Popis: When gas is released into a building, it will begin to disperse under the action of its own momentum and buoyancy, and of any pre-existing ventilation flows. For small releases, even slight ventilation may reduce the gas concentration below dangerous (e.g. flammable) limits, whereas, at the other extreme, large releases could result in a breach of containment, and hence would be only slightly affected by the presence of the building. For intermediate-scale releases, which are of interest in risk assessments, the nature of the build-up and movement within the building, along with the size and locations of any openings, will determine the rate at which gas is released to the environment. This study was undertaken as part of an ongoing research effort to enable effects of buildings on gas build-up, and subsequent release to the environment, to be calculated with greater confidence. Existing techniques for such calculations tend to use the assumption of complete mixing within the volume at any given time, thus enabling transient release rates from the building to be determined. Whilst this may be appropriate for high-momentum releases, it is clearly too simplistic for general application. Measurements of the build-up of CO2, released within a simple cube of side 2.4 m, have, therefore, been undertaken in the test facility at the Silsoe Research Institute, and compared with the results from both CFD and zone modelling. Provided that care is taken in their application, these models both produce reasonable comparisons with the experimental data.
Databáze: OpenAIRE
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