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Mätosäkerhet vid mätning av gaskällor och gassänkor i ventilerade utrymmen
Örebro University, Department of Technology. (Byggteknik)
2004 (Swedish)Report (Other academic)
Abstract [sv]

A common way to measure the sink or source of gases in ventilated rooms is to use one measuring instrument and one control valve. The control valve, which is operated by a computer, obtains samples of gas from exhaust and supply air. The measurements obtained are then analysed using various difference methods. The largest uncertainty occurs in the gas measurement irrespective of which of the gases is measured in this case, carbon dioxide, formaldehyde (FAD) and total volatile organic compounds (TVOC). Carbon dioxide is measured by the NDIR-method and both FAD and TVOC are measured by the PAS-method. If the standard uncertainty for the measurement of carbon dioxide is reduced from 4 ppm to 0,0002 pm, the influence from the airflow rate is affected from 0 up to 10 % of the uncertainty for the measured specified carbon dioxide flow rate. If the air climate in exhaust and supply air is measured, it is possible to find a slight influence from the measurement of the airflow rate. Two temperature sensors and two moisture sensors measure the climate.

Place, publisher, year, edition, pages
Örebro: Örebro universitet , 2004. , p. 17
Series
Studies from the department of technology at Örebro University, ISSN 1404-7225 ; 12
Keywords [en]
uncertainty, measurement, carbon dioxide, formaldehyde, FAD, Volatile Organic Compounds, VOC, indoor climate
National Category
Building Technologies
Research subject
Building Technology
Identifiers
URN: urn:nbn:se:oru:diva-3245OAI: oai:DiVA.org:oru-3245DiVA, id: diva2:137542
Available from: 2008-11-28 Created: 2008-11-28 Last updated: 2017-10-18Bibliographically approved

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Larsson, Tord

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