A method to measure the ozone penetration factor in residences under infiltration conditions: application in a multifamily apartment unit. (16th July 2015)

• Record Type: Journal Article
• Authors: Zhao, H.; Stephens, B.
• Is Part Of: Indoor air. Volume 26:Number 4(2016:Aug.)
• Page Start: 571
• Page End: 581
• Publication Date: 2015-07-16
• Subjects: Outdoor ozone -- Human exposure -- Infiltration factor -- Indoor chemistry -- Building envelope -- Building enclosure; Indoor air pollution -- Periodicals; Sick building syndrome -- Periodicals; Ventilation -- Periodicals; 613.5
• DOI: 10.1111/ina.12228
• Languages: English
• ISSNs: 0905-6947

Abstract

Abstract: Recent experiments have demonstrated that outdoor ozone reacts with materials inside residential building enclosures, potentially reducing indoor exposures to ozone or altering ozone reaction byproducts. However, test methods to measure ozone penetration factors in residences ( P ) remain limited. We developed a method to measure ozone penetration factors in residences under infiltration conditions and applied it in an unoccupied apartment unit. Twenty‐four repeated measurements were made, and results were explored to (i) evaluate the accuracy and repeatability of the new procedure using multiple solution methods, (ii) compare results from 'interference‐free' and conventional UV absorbance ozone monitors, and (iii) compare results against those from a previously published test method requiring artificial depressurization. The mean (±s.d.) estimate of P was 0.54 ± 0.10 across a wide range of conditions using the new method with an interference‐free monitor; the conventional monitor was unable to yield meaningful results due to relatively high limits of detection. Estimates of P were not clearly influenced by any indoor or outdoor environmental conditions or changes in indoor decay rate constants. This work represents the first known measurements of ozone penetration factors in a residential building operating under natural infiltration conditions and provides a new method for widespread application in buildings.