Umeå University's logo

umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Stable carbon isotope labelled carbon dioxide as tracer gas for air change rate measurement in a ventilated single zone
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.ORCID iD: 0000-0003-4015-199X
Örebro universitet.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Show others and affiliations
2017 (English)In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 115, p. 173-181Article in journal (Refereed) Published
Abstract [en]

Carbon dioxide (CO2) has often been used as tracer gas for measurement of the air change rate l (h1 ) in buildings. In such measurements, a correction is required for the presence of indoor CO2, which commonly consists of atmospheric CO2 mixed with human respired CO2. Here, 13C isotope-labelled CO2 was employed as tracer gas, and cavity ring-down spectroscopy (CRDS) was used for simultaneous measurement of the two isotope analogues 12CO2 and 13CO2. This enabled the simultaneous measurement of the 13CO2 tracer gas, with correction for background 13CO2, and the concentration of indoor CO2, allowing for presence of occupants. The background correction procedure assumes that the isotope delta of the background indoor CO2 equals dB ¼ 19‰, based on the prior information that the carbon isotope ratio RB ¼ 13C/12C of all carbon in the bio-geosphere of earth is in the interval 0.010900 < RB < 0.011237. Evidence supported that l could be accurately measured, using the new 13CO2 tracer method, even when the background 13CO2 concentration varied during the measurement time interval, or when the actual dB value differed from the assumed value. The measurement uncertainty for l was estimated at 3%. Uncertainty in l due to uncertainty in RB, uRB(l), was estimated to increase with a decreasing amount of 13CO2 tracer. This indicated that at least 4 ppm tracer must be used, in order to obtain uRB(l)/l < 2%. The temporal resolution of the l measurement was 1.25/l h.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 115, p. 173-181
Keywords [en]
Air change rate, Ventilation efficiency, Tracer technique, Cavity ring-down spectroscopy, C-13-CO2, Isotope labelled carbon dioxide
National Category
Environmental Analysis and Construction Information Technology Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-131522DOI: 10.1016/j.buildenv.2017.01.021ISI: 000397363000015Scopus ID: 2-s2.0-85010877288OAI: oai:DiVA.org:umu-131522DiVA, id: diva2:1074741
Projects
Bio4Energy
Funder
Bio4EnergyAvailable from: 2017-02-16 Created: 2017-02-16 Last updated: 2023-03-23Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Ohlsson, AndersYang, BinBoman, ChristofferNyström, RobinOlofsson, Thomas

Search in DiVA

By author/editor
Ohlsson, AndersYang, BinBoman, ChristofferNyström, RobinOlofsson, Thomas
By organisation
Department of Applied Physics and Electronics
In the same journal
Building and Environment
Environmental Analysis and Construction Information TechnologyPhysical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 523 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf