English

This paper presents the latest edition of the standard 62.1. It combines the 62.2001 version with 17 approved addenda, all of them have been approved by both Ashrae and ANSI. The most significant changes involved the ventilation rate procedure, minimum ventilation rate table and outdoor air treatment requirements.
That document is easy to use for designers, code officials and others users .
That standard is continuously reviewed and revised through addenda to keep up with new research findings and experience from the field.

This paper describes a pilot study conducted in an occupied family house in Ohio to determine if a script-based protocol could be used to obtain data useful for the identification of the key factors affecting air-exchange rate (AER) and the relationship between indoor and outdoor concentrations of selected traffic-related air pollutants.

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.

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.

The bristle of a rotating cleaning brush for air ducts was modelled using large deformaion elastic theory. The point collocation method with a trial solution consisting of undertermined parameters was employed to discretize the resulting non-linear problem. The main interest was in determining the value of the bristle tip contact normal force N, the bristle tip contact angle B and the torque T needed to rotate a brush. The results obtained using the simple model were compared with the results obtained from a laboratory test.