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| Title: | The influence of chemical interactions at the human surface on breathing zone levels of reactants and products |
| Author (s): | Rim, D. Novoselec, A. Morrison, Glenn |
| Department/Lab Affiliations: | Civil, Architectural & Environmental Engineering Environmental Research Center |
| Keywords: | CFD breathing zone concentration exposure human surface ozone reaction products |
| Subject Terms: | Ozone. |
| Issue Date: | 2009-01 |
| Publisher: | Wiley Blackwell |
| Citation: | D. Rim, A. Novoselec, and G. Morrison. “The influence of chemical interactions at the human surface on breathing zone levels of reactants and products”, Indoor Air, January 2009. |
| Abstract: | Using computational fluid dynamics simulations of an occupant in a ventilated room, we find that breathing zone ozone levels can be substantially lower and ozone reaction products associated with human surfaces (ORPHS) levels considerably higher than room levels. For air exchange rates <3/h, the ratio of the breathing zone to the ozone concentration 1 m from the body (bulk air), rozone, ranges from 0.59 to 0.75 for floor or ceiling air supply. ORPHS are enriched in the breathing zone, with concentrations for these conditions ranging from 1.2 to 2.5 greater than bulk air concentrations. At high air exchange rates (>8/h), the breathing zone concentrations approach bulk air concentrations (rozone > 0.9) with a floor supply, whereas large concentration gradients occur between breathing zone and bulk air with a ceiling supply. At these high air exchange rates, ORPHS levels are 1.6–2.0 and 2.9–6.0 times the bulk air concentrations for floor and ceiling supply, respectively. The extent of depletion of ozone or enrichment of ORPHS is large enough that reliance on micro-environmental measurements alone, to assess the intake of ozone or ORPHS, is undesirable. |
| Type: | Article - Journal text |
| In Title: | Indoor Air |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. for anything published after 2007, preprint allowed, postprint after 12 months FULL COPYRIGHT INFORMATION: |
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| title | The influence of chemical interactions at the human surface on breathing zone levels of reactants and products |
| contributor.author | Rim, D. |
| contributor.author | Novoselec, A. |
| contributor.author | Morrison, Glenn |
| contributor.deptlab | Civil, Architectural & Environmental Engineering |
| contributor.deptlab | Environmental Research Center |
| contributor.sponsor | National Science Foundation |
| contributor.sponsor | University of Texas - Austin |
| subject | CFD |
| subject | breathing zone concentration |
| subject | exposure |
| subject | human surface |
| subject | ozone reaction products |
| subject.LCSH | Ozone. |
| date.issued | 2009-01 |
| publisher | Wiley Blackwell |
| identifier.citation | D. Rim, A. Novoselec, and G. Morrison. “The influence of chemical interactions at the human surface on breathing zone levels of reactants and products”, Indoor Air, January 2009. |
| identifier.pub.URI | |
| description.abstract | Using computational fluid dynamics simulations of an occupant in a ventilated room, we find that breathing zone ozone levels can be substantially lower and ozone reaction products associated with human surfaces (ORPHS) levels considerably higher than room levels. For air exchange rates <3/h, the ratio of the breathing zone to the ozone concentration 1 m from the body (bulk air), rozone, ranges from 0.59 to 0.75 for floor or ceiling air supply. ORPHS are enriched in the breathing zone, with concentrations for these conditions ranging from 1.2 to 2.5 greater than bulk air concentrations. At high air exchange rates (>8/h), the breathing zone concentrations approach bulk air concentrations (rozone > 0.9) with a floor supply, whereas large concentration gradients occur between breathing zone and bulk air with a ceiling supply. At these high air exchange rates, ORPHS levels are 1.6–2.0 and 2.9–6.0 times the bulk air concentrations for floor and ceiling supply, respectively. The extent of depletion of ozone or enrichment of ORPHS is large enough that reliance on micro-environmental measurements alone, to assess the intake of ozone or ORPHS, is undesirable. |
| type | Article - Journal |
| type.DCMIType | text |
| type.status | Postprint |
| relation.isPartOf | Indoor Air |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights | for anything published after 2007, preprint allowed, postprint after 12 months |
| rights.URI | |
| identifier.persist.URI | |
| date.available | 2009-06-19T16:24:49Z |