The steady-state distribution of contaminant concentrations in a workroom depends on several factors, among them the types of air inlets and exhausts and their relative position. For that study different inlets and exhaust locations and types have been investigated in order to determine the optimal ones.Contaminant concentrations were explored by CFD and the results were validated with experimental results.

This paper discusses a procedure of building calibration for indoor air quality management. The aim is to set the mimimum fresh air quantity in function of the indoor pollutant concentrations rather than metabolic carbon dioxide. Records of IAQ in a typical high-rise building is also presented in this article.

For the numerical analysis of particle deposition velocity and deposited particle mass flux in the ventilation duct, CFD has been adopted. This paper presents a three-dimensional drift-flux model combined with particle deposition boundary conditions for wall surfaces. In order to understand the particle deposition in the straight ventilation duct, several groups of particle size are investigated at two average air speeds in ducts.

A methodology is proposed to perform a multicriteria analysis of health, comfort and energy efficiency in buildings. That methodology is applied to a sample of 64 office buildings and 96 apartment buildings. Two sets of buildings have been determined : best buildings and unacceptable ones in terms of comfort, health, energy saving. The significant differences are presented. It appears possible to design healthy, comfortable and energy efficient buildings.

96 apartment buildings and 64 office buildings were investigated for that survey in correlation with the european HOPE project. Occupants answered questionnaires to determine their satisfaction about comfort and health. The collected data were compared and analyzed. Correlations between perceived comfort and building characteristics were found along with correlations between perceived comfort and building related symptoms As a conclusion, it appears possible to design healthy, comfortable and energy efficient buildings.

A continuous monitoring of air quality parameters in 85 classrooms in Minnesota during one year has been done. Monthly reports of results helped the school personnel in planning and improving air quality when necessary. That study shows that thanks to a group of motivated shcols, unobtrusive monitoring and a regular measurement of air quality parameters, a significant improvement of IAQ can be done.

This paper is an analysis of the measured outdoor air ventilation rates from the US EPABASE study that involved indoor environmental measurements, including ventilation, in 100 US office building using a standardized protocol. The results are compared with the requirements of the Ashrae Standard 62-2001.

The new concept using continuous unipolar ion emission has proved its efficiency on facepiece respirators. So it has been applied to conventional HVAC filters, and the laboratory study demonstrates that it works well too. The enhancement effect depends on the filter type and on the distance from the ion emitter to the filter surface.The explanation of those results is presented

The development of a low order model is outlined in this paper, it can be used for control purposes , and for the quantification of ventilation performance in ventilated systems. First, numerical simulations allowed the generation of an informative pollutant transport data . Then a low order transfer function model was built. The obtained results show that first order model can sufficiently describe the dominant mass transfer dynamics in the ventilated air space.

For that study, a simple theoretical model has been developed for the prediction of the time taken to flush neutrally-buoyant pollutants from a naturally ventilated room. The flow is driven by localised heat inputs. It appears that the rate of flushing depends on the room volume. The predicted flushing times tally with the experiments.