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Article

A Discussion Regarding the Measurement of Ventilation Rates Using Tracer Gas and Decay Technique

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Department of Civil Engineering, Campus Politécnico de Repeses, Polytechnic Institute of Viseu, School of Technology and Management, 3504-510 Viseu, Portugal
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CONSTRUCT-LFC, Faculty of Engineering (FEUP), University of Porto, 4200-465 Porto, Portugal
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Faculty of Engineering (FEUP), University of Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
*
Author to whom correspondence should be addressed.
Received: 1 October 2020 / Revised: 9 October 2020 / Accepted: 9 October 2020 / Published: 12 October 2020
The measurement of ventilation rates is crucial in understanding buildings’ performances, but can be a rather complex task due to the time-dependency of wind and buoyancy forces, which are responsible for the pressure differences that induce air movement across the envelope. Thus, assessing air change rate through one-time measurements during brief periods of time may not be a reliable indicator. In this paper, the variability in the measurement of ventilation rates using the decay technique was evaluated. To that end, two compartments of a typical single-family detached dwelling were selected as a case study and 132 tests were performed, considering two different boundary conditions (door closed and door open). This work allowed the large variability of the results to be highlighted, as the coefficient of variation ranged from 20% to 64%. Wind speed had a key effect on the results, especially because during the measurements indoor–outdoor temperature differences were not so significant. The possibility of using occupant-generated carbon dioxide as tracer gas was also analyzed, but problems of cross-contamination were identified. View Full-Text
Keywords: air change rate; decay technique; measurement variability; tracer gas; ventilation air change rate; decay technique; measurement variability; tracer gas; ventilation
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MDPI and ACS Style

Almeida, R.M.S.F.; Barreira, E.; Moreira, P. A Discussion Regarding the Measurement of Ventilation Rates Using Tracer Gas and Decay Technique. Infrastructures 2020, 5, 85. https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures5100085

AMA Style

Almeida RMSF, Barreira E, Moreira P. A Discussion Regarding the Measurement of Ventilation Rates Using Tracer Gas and Decay Technique. Infrastructures. 2020; 5(10):85. https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures5100085

Chicago/Turabian Style

Almeida, Ricardo M.S.F., Eva Barreira, and Pedro Moreira. 2020. "A Discussion Regarding the Measurement of Ventilation Rates Using Tracer Gas and Decay Technique" Infrastructures 5, no. 10: 85. https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures5100085

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