English

This paper presents the results of an analysis of available scientific findings on how ventilation rate affects work performance. Almost all studies found an increase in performance with higher ventilation rates. The aim was to develop the best possible quantitative relationship between ventilation rate and work performance for use in cost benefit calculations related to building design and operation.

A technique used for the analysis of the contaminant transport in the wake of a bluff body is tested under controlled experimental conditions for application to aerosol transport in a complex furnished room. The authors ' hypothesis is that the dispersion of contaminants in a room is related to the turbulence kinetic energy and length scale. Their approach has been tested both in laboratory and with CFD simulations. Results and conclusions are presented.

In this paper the relationship between air-conditioning energy consumption and the proportion of non-satisfied people in commercial buildings located in Changsha (Hunan Province) is analyzed. Concerning the residentail buildings, the energy consumption and its main influencing factors are discussed too.
The authors think necessary a huge mobilization for everybody takes part into energy saving work.

The aim of this study was to evaluate the association of work-related symptoms, accessed by a standardized questionnaire, of full-time workers from a sealed building, with HVAC system, in comparison with a naturally ventilated building in Rio de Janeiro, a city with hot and humid climate.
The cross-sectional study involved 1,736 full-time office workers of a sealed 42-storey office building and 950 of a non-sealed 14-storey office building, both situated in the downtown area of Rio de Janeiro.

The aim of this study was to investigate if work-related symptoms (Sick Building Syndrome SBS), assessed by a standardized questionnaire, could be related to the concentration of the main indoor pollutants, in office workers of a sealed building in a tropical city. For that, 1736 office workers of a 42 storey sealed building were asked to answer the questionnaire.

The air contamination has become a problem in Japanese classrooms. The indoor measurement of Formaldehyde and VOC has become compulsory according to the law. A simple method of measurement the constant concentration attenuation method has been used to investigate the ventilation amount in 14 classrooms. CO2 was used as a tracer gas.
The analysis of the relations between ventilation amount and concentration of VOC is presented.

Experimental measurements and CFD simulations were carried out to study the contaminant dispersion in a ventilated room with an area source release. A displacement ventilation system and three mixing ventilation systems using a grille, square, and slot diffuser were used. A model was validated to study the effects of airflow and the area source location on the dispersion of the contaminants. The simulation results have been compared to the experimental data, the conclusion are presented.

This paper presents an experimental study with numerical predictions of airflow and temperature characteristics. It was conducted in a full size experimental room with different supply jet conditions, heat densities and air distribution methods including the FR (floor return) and the TR (top return) air distribution configuration.

The aim of this paper was to study the effect of duct cleaning on the perceived air quality. Duct cleaning was carried out in 10 non-problem Finnish office buildings between 1997 and 2000. Before and after the cleaning, concentrations of particle mass, viable fungal spores and bacteria, TVOC and CO2 were measured in outdoor, indoor and supply air every 6 months. In parallel, a questionnaire about their feeling, was distributed to employees before and after the cleaning.

This paper considers regulations and standards and compare them about their requirements in ventilation flow rates and IAQ. They can be a helpful tool to handle these requirements and to create buildings with a quality level which satisfies the needs of the users
Scandinavian countries are quite similar in respect of culture, building tradition, climate and so on. So, the difference in ventilation requirements between them should be expected to be small but the results of their comparison show a wide difference.