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Estimation of bias with the single-zone assumption in measurement of residential air exchange using the perfluorocardon tracer gas method
Van Ryswyk, K. Wallace, L. Fugler, D. MacNeill, M. Héroux, M. È. Gibson, M. D. Guernsey, J. R. Kindzierski, W. Wheeler, A. J.
Van Ryswyk, K.
Wallace, L.
Fugler, D.
MacNeill, M.
Héroux, M. È.
Gibson, M. D.
Guernsey, J. R.
Kindzierski, W.
Wheeler, A. J.
Abstract
Residential air exchange rates (AERs) are vital in understanding the temporal and spatial drivers of indoor air quality (IAQ). Several methods to quantify AERs have been used in IAQ research, often with the assumption that the home is a single, well‐mixed air zone. Since 2005, Health Canada has conducted IAQ studies across Canada in which AERs were measured using the perfluorocarbon tracer (PFT) gas method. Emitters and detectors of a single PFT gas were placed on the main floor to estimate a single‐zone AER (AER1z). In three of these studies, a second set of emitters and detectors were deployed in the basement or second floor in approximately 10% of homes for a two‐zone AER estimate (AER2z). In total, 287 daily pairs of AER2z and AER1z estimates were made from 35 homes across three cities. In 87% of the cases, AER2z was higher than AER1z. Overall, the AER1z estimates underestimated AER2z by approximately 16% (IQR: 5–32%). This underestimate occurred in all cities and seasons and varied in magnitude seasonally, between homes, and daily, indicating that when measuring residential air exchange using a single PFT gas, the assumption of a single well‐mixed air zone very likely results in an under prediction of the AER.
Keywords
air exchange, tracer gas, residential, mass balance equation, indoor air, perfluorocarbon
Date
2015
Type
Journal article
Journal
Indoor Air
Book
Volume
25
Issue
6
Page Range
610-619
Article Number
ACU Department
Institute for Learning Sciences and Teacher Education (ILSTE)
Faculty of Education and Arts
Faculty of Education and Arts
Relation URI
Source URL
Event URL
Open Access Status
Open access
License
CC BY-NC-ND 4.0
File Access
Open