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Author(s): Clito Afonso
Title: Tracer gas technique for measurement of air infiltration and natural ventilation: Case studies and new devices for measurement of mechanical air ventilation in ducts
Issue Date: 2013
Abstract: In buildings without mechanical ventilation, the fresh air needed by the occupants is supplied only by airinfiltration or natural ventilation. Its quantification by analytical methods is difficult, and so experimentalmethods such as the tracer gas technique are very useful. In this work, several case studies are presented,where one may see the potential of this technique to detect small differences in building air tightness, dueto different envelope elements, namely the type of window frames and location of blinds boxes. Theapplicability of this technique to other spaces rather than buildings can also be analyzed. When dealingwith mechanical ventilation, it is difficult to measure the duct air flow rate precisely, because of theminimum duct length necessary to obtain a good mixing of the tracer gas with the air, when conventionalprobes are used. Research was carried out with the development of new probes to overcome this situation,and results are also shown. With accurate measurements of air flow rates, it is possible to reduce CO2emissions due to air heating or cooling in buildings.
Subject: Ciências Tecnológicas, Ciências da engenharia e tecnologias
Technological sciences, Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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