Personal CO 2 cloud: laboratory measurements of metabolic CO 2 inhalation zone concentration and dispersion in a typical office desk setting.

Autor: Pantelic J; Center for the Built Environment, University of California Berkeley, Berkeley, CA, USA. pantelic@berkeley.edu., Liu S; Center for the Built Environment, University of California Berkeley, Berkeley, CA, USA.; Department of Civil and Environmental Engineering, Worcester Polytechnic Institute, 100 Institute Rd, WPI - Kaven Hall, Worcester, MA, 01609, USA., Pistore L; Center for the Built Environment, University of California Berkeley, Berkeley, CA, USA.; Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università, 5, 39100, Bolzano, BZ, Italy., Licina D; Human-Oriented Built Environment Lab, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland., Vannucci M; Center for the Built Environment, University of California Berkeley, Berkeley, CA, USA., Sadrizadeh S; Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA, 94720, USA., Ghahramani A; Center for the Built Environment, University of California Berkeley, Berkeley, CA, USA., Gilligan B; General Services Administration, 1800 F St NW, Washington, DC, 20405, USA., Sternberg E; Institute on Place, Wellbeing and Performance, University of Arizona College of Medicine, P.O. Box 245153, Tuscon, AZ, 85724, USA., Kampschroer K; General Services Administration, 1800 F St NW, Washington, DC, 20405, USA., Schiavon S; Center for the Built Environment, University of California Berkeley, Berkeley, CA, USA.
Jazyk: angličtina
Zdroj: Journal of exposure science & environmental epidemiology [J Expo Sci Environ Epidemiol] 2020 Mar; Vol. 30 (2), pp. 328-337. Date of Electronic Publication: 2019 Oct 21.
DOI: 10.1038/s41370-019-0179-5
Abstrakt: Inhalation exposure to pure and metabolic elevated carbon dioxide (CO 2 ) concentration has been associated with impaired work performance, lower perceived air quality, and increased health symptoms. In this study, the concentration of metabolic CO 2 was continuously measured in the inhalation zone of 41 subjects performing simulated office work. The measurements took place in an environmental chamber with well-controlled mechanical ventilation arranged as an office environment. The results showed the existence of a personal CO 2 cloud in the inhalation zone of all test subjects, characterized by the excess of metabolic CO 2 beyond the room background levels. For seated occupants, the median CO 2 inhalation zone concentration levels were between 200 and 500 ppm above the background, and the third quartile up to 800 ppm above the background. Each study subject had distinct magnitude of the personal CO 2 cloud owing to differences in metabolic CO 2 generation, posture, nose geometry, and breathing pattern. A small desktop oscillating fan proved to be suitable for dispersing much of the personal CO 2 cloud, thus reducing the inhalation zone concentration to background level. The results suggest that background measurements cannot capture the significant personal CO 2 cloud effect in human microclimate.
Databáze: MEDLINE