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Author(s): Clito Afonso
Title: Ventilation in Buildings: Measurements Techniques, Experimental Results and New Advances
Issue Date: 2004
Abstract: reduce the energy consumption used for heatingand air conditioning in buildings neglecting the comfortand the indoor air quality of the occupants. This wasachieved with an increase in buildings tightness. In the 80s it was realized that the adoptedstrategy in the last decade to reduce the energyconsumption in buildings could lead to the sick buildingsyndrome related with all the disastrous consequences tothe occupants. In the 90s the concept of global building designhave emerged taking in account the environmentalaspects based not only in the equipment performance butalso in other quality criteria which leaded to significanttechnological modifications such as the use of newrefrigerants with zero ozone depletion potential and greeneffect in AVAC systems, /1/. This stated evolution in time of building conceptand its rule leaded to its energetic analysis.One of the ways of the energy conservation in buildingsgoes trough the reduction of the air infiltration, which, inseveral countries, is the only way to promote the airrenewal. As already stated this air renewal cannot gobelow certain limits as the occupants would be exposedto internal pollutants concentrations far behind of theacceptable limits, /2/. The maintenance of a clean indoor air inbuildings depends on the removal capacity to eliminatethe internal pollutants generated inside. These pollutantsare due either to the internal materials that permanentlyrelease VOCs, and either by the physiological processesof the occupants. So the indoor air quality can beincreased by several methods: i) promoting the reductionor elimination of the pollutant source; ii) using filters orother kind of material to absorb (eliminate) the pollutantsor iii) increasing the airflow inside based either on the airinfiltration, natural ventilation or mechanical ventilation.While the implementation of the first method is onlypossible for some specific cases, e.g., forbidden to smokeinside, the second one is usually too much expansive tobe implemented. So the only effective way to achieve abetter indoor air quality is by the implementation of thethird method by one of the three mechanisms referredand so the necessity to know how to quantify these airexchanges. This work shows how to measure the airinfiltration (the most frequent situation in severalcountries) or natural ventilation in buildings as well asnew devices that enables the increase of the air exchangebetween inside and outside of buildings. When inpresence of mechanical ventilation it is also shown thenew developed probes that enable the measurement ofduct airflows in complex duct nets.
Subject: Outras ciências da engenharia e tecnologias
Other engineering and technologies
Scientific areas: Ciências da engenharia e tecnologias::Outras ciências da engenharia e tecnologias
Engineering and technology::Other engineering and technologies
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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