The author asserts that to maintain a good indoor air quality, both ventilation and reduction of the pollutants sources are necessary. Standard 62.2 defines the minimum requirements about ventilation for an acceptable indoor air quality, but does not deal directly with the sources of pollutants. So the author gives an inventory of the main indoor air pollutants and how to cope with them. He maintains that the treatment of the pollutants at their source is very often the best way to keep a good indoor air quality.
Ultraviolet germicidal irradiation (UVGI) systems are used to disinfect air, they consist in mounting shielded UVGI lamps at high level in an upper room zone, and the natural convection currents that occur in a room space carry airborne microorganisms through the UV field. This study demonstrates that the effectiveness of those systems is dependant on both the ventilation regime and the in-room air mixing.
Electret media or "charged" media are electrostatically charged materials that attract, like magnets do, microscopic charged or uncharged particulates. Those media are not the same in structure, stability, distribution of charge and size of their internal electric fields. Charge and structure together determine an electret media performance. In this paper the results of different filter media put to the tests are presented.
An optimal placement of outside air intakes is important for a good IAQ protection. A proper intake placement can also reduce the need for filtration, and reduce re-entrainment of chemical emissions.
In this paper the author relates his experiment : while interviewing unhappy building occupants he realized that it was necessary to step back from the specific complaints and begin with the basics of proper ventilation, moisture control, temperature control before embarking on costly scientific investigations to solve the problem.
This paper presents the advantages and drawbacks of natural ventilation. . The author points out that a natural ventilation would be satisfying, mainly for buildings in mild climates, in taking account the type and quantity of sources in the occupied spaces.
SUBURET stands for Sustainable Building Retrofit. The basic idea behind the sustainability concept is that normal renovation work fails to meet future needs and, far from exploiting the available potential, prevents any real modernization of the building stock. The name SUBURET designates both the workshop itself and all the R&D initiatives proposed.
The SUBURET programme aims to promote advanced retrofit concepts and technologies specifically focused on housing and office buildings and based on the following principles:
A simple model of a rotating duct cleaning brush was presented using large deformation elastic theory. The results obtained by the model were compared with the results obtained by a laboratory test. Especially, the effect of air drag on the brush behaviour was considered.
Rotating brushes are commonly used in cleaning air ducts. A very simple model simulating the behaviour of a typical brush bristle is presented. The model consists, in effect, of a combination of a polynomial trial solution, the point collocation method, Simpson's integration rule and a Mathcad code. The main interest from the cleaning point of view is in determining the contact force and the contact angle between the bristle tup and the duct surface. The effect of the degree n of the polynomial trial solution - n=4, n=6, n=8 - is studied.
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