English

Describes the testing methods of filters intended to be used in ventilation systems, and their classification according to their performance.

Describes the new regulations concerning the energy efficiency of buildings and ventilation requirements that have been adopted for Ireland.

The focus of project Web has been the development of wind enhancement and integration techniques which improve the annual energy yield per installation by concentrating the low to moderate wind speeds (2-5 m/s).

The Solvent window was developed to improve visual and thermal comfort in sunny conditions. The glazing system realizes the conversion of short wave solar radiation to convective heat and long wave radiation.

The aim of this study was to define whether energy savings and comfortable conditions are achievable along with a reduction or even suppression of the mechanical cooling systems.Three different cooling systems (mechanical standard air conditioning, hybrid cooling, mechanical ventilation cooling) were simulated for a typical US office space under 40 different US climatic data, to calculate energy consumptions.

Sixteen countries world wide have participated to this international programme (IEA ECBCS Annx 35) running from 1998 to 2002 about "Hybrid ventilation in new and retrofitted office buildings" . All results of the project are published in a booklet and a CD ROM. They have also be published onthe AIVC CD (see AIRBASE recording number 14923).

A poor ventilation in buildings costs considerable amounts of money for hospitals and businesses.10 % of hospital acquired infections are directly due to an airborne route. The quantity and the quality of air supplied is important but also the way it is introduced into spaces. A change of the Wells Riley equation (establishing a link between the likelihood of infection, the infective agent production rate, the exposure time, the pulmonary and room ventilation rate) is proposed to take into account ventilation eefectiveness.

This paper deals with the case of a very important thermal discomfort due to wide open arcades and corridors beneath a building, especially under windy and rainy weather. Building thermal simulations (with ESP-r) and field measurements were operated for a building at Coimbra University (Portugal) to suggest architectural corrections (e.g. closing the arcades with windows and doors) in order to reduce discomfort outside and inside the building sand save energy.

Values for total dust concentration in indoor air in day-care centres, offices and schools with no reported problems are measured. These are: day-care centres 41 14 g/m3, offices 16 5 g/m3, schools 20 10 g/m3. In parallel the particle size distribution in six interval from 0.3 m - >20 m are reported. No seasonal variation in total dust concentration could be seen. Sudden increase in number of the particles in the smallest intervals are found at night for some systems when they are shut down or working on reduced speed.

This paper reports some findings from IEA ECBCS Annex 35 about wind driven flow through building openings. Wind tunnel studies have been performed on simplified buildings, in order to know if pressure distributions on sealed buildings can be used to predict airflow through facade openings. A new parameter, the catchment area, is introduced by author.