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Influence of Local Airflow on the Pollutant Emission from Indoor Building Surfaces
Author(s) -
Topp* Claus,
Nielsen Peter V.,
Heiselberg Per
Publication year - 2001
Publication title -
indoor air
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.387
H-Index - 99
eISSN - 1600-0668
pISSN - 0905-6947
DOI - 10.1034/j.1600-0668.2001.011003162.x
Subject(s) - airflow , environmental science , pollutant , indoor air quality , indoor air , air pollutants , environmental engineering , atmospheric sciences , meteorology , air pollution , engineering , geography , chemistry , geology , mechanical engineering , organic chemistry
This article reports the results of an investigation, based on fundamental fluid dynamics and mass transfer theory, carried out to obtain a general understanding of the mechanisms involved in the emissions from building materials in ventilated rooms. In addition, a generally applicable method for the prediction of surface emissions is proposed. The work focused on the emission of vapours and gases and no particulate emissions were considered. The methods used were numerical calculations by computational fluid dynamics (CFD) and full-scale laboratory experiments. It was found that the emissions are a strong function of air-change rate, local air velocity and local turbulence, as the mass transfer coefficient increases in proportion to these parameters. The findings further show that the mass transfer coefficient increases in proportion to the velocity when the emission is controlled by evaporation from the surface. With regard to diffusion-controlled emissions, the mass transfer coefficient is unaffected by the velocity.