| 1. |
- Afshari, Alireza, 1956, et al.
(författare)
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Impact of Ventilation Rate, Ozone and Limonene on Perceived Air Quality in Offices
- 2002
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Ingår i: Proceedings of the Indoor Air 2002 Conference.
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Konferensbidrag (refereegranskat)abstract
- The objective of this study has been to clarify to what extent ozone (03) and 03 !limonene in interaction with surface materials has an impact on the indoor air quality in typical low-polluting offices at various, realistic air change rates. Changes of environmental conditions were performed seven days before the chemical sampling. Organic compounds were collected on Tenax TA adsorbent tubes and the samples were analysed by gas chromatography with flame ionisation and mass selective detectors. The concentration of Total Volatile Organic Compounds were asexpected found to be inversely proportional to air change rates. Aldehydes and organic acids werefound at increased levels when the air change rate was decreased from 1.0 h1 to 0.3 h1. Increased ventilation rate to 3.0 h1 did not induce additional changes in the chemical composition of aldehydes and organic acids. The fractions of aldehydes and organic acids relative to nonreactive alkanes indicated that chemical transformation in the indoor environment indeed took place; however, it could not be clearly specified whether the chemical changes were of homogeneous or heterogeneous character. The effects of 03 and 03 /limonene in interaction with surface materials in the offices over seven weeks showed different reaction pattems depending material and treatment.
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| 2. |
- Lundgren, Björn, 1941, et al.
(författare)
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Air quality in offices, impact of ventilation rate, ozone and limonene
- 2003
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Ingår i: The 4th international conference on Cold Climat HVAC.
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Konferensbidrag (refereegranskat)abstract
- The objective of this study has been to clarify to what extent ozone (O3) and O3 /limonene in interaction with surface materials has an impact on the indoor air quality in typical low-polluting offices at realistic outdoor air change rates. Three similar offices furnished with the same materials and ventilated with charcoal filtered outdoor air were used in the study. Eight environmental conditions with different realistic combinations of air change rate, O3 and limonene levels were studied. Changes of environmental conditions were performed seven days before the first chemical sampling was performed at set conditions. Decreasing the air change rate from 1.0 to 0.3 h-1 increased the levels of volatile organic compounds in the indoor air. The presence of ozone affected the level and fraction of aldehydes proposing chemical transformations. Adding new materials to the offices at a low air change rate of 0.3 h-1 demonstrated a variable effect depending on the specific air quality in the room. Normal concentration of O3 in indoor environment contributes to chemical transformations even in low-polluted offices.
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