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Annals of Occupational Hygiene Advance Access originally published online on March 2, 2007
Annals of Occupational Hygiene 2007 51(3):311-325; doi:10.1093/annhyg/mem001
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© The Author 2007. Published by Oxford University Press on behalf of the British Occupational Hygiene Society

A Numerical Method of Reconstructing the Pollutant Concentration Field in a Ventilated Room

R. BRACONNIER* and F. BONTHOUX

Process Engineering Department, Institut National de Recherche et de Sécurité Vandoeuvre les Nancy, France

*Author to whom correspondence should be addressed. E-mail: robert.braconnier{at}inrs.fr

Pollutant source emission flow rates in the workplace are typically unknown in occupational hygiene. Similarly, a restricted number of concentration measurements can provide only spatial limited information on the pollutant distribution in the room. This paper presents a numerical method to evaluate the intensities of pollutant sources and to reconstruct the associated concentration field at every point of a ventilated enclosure containing one or several pollutant sources of unknown emission rate. This reconstructed concentration field is obtained both from the geometric and ventilation characteristics of the enclosure and from a limited number of fixed-station concentration measurements. The method is currently applicable to steady situations. The predictions obtained are then compared with concentration measurements in a laboratory closed cabin under controlled ventilation. Pollutant sources generated tracer gas emissions at known flow rates. Comparisons were performed successively for three different physical configurations.

Keywords: emission rates • inverse method • predictive ventilation • pollutant sources • pollution mapping • reconstruction


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