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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

Ricardo M. S. F. Almeida (Autor) Outra; Eva Barreira (Autor) FEUP; Pedro Moreira (Autor) Outra

Revista

Título: Infrastructures

Vol. 5 Nº 10

Páginas: 1-13

Editora: MDPI

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00S-V06

DOI: 10.3390/infrastructures5100085

Abstract (EN): <jats:p>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.</jats:p>

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13