English

A new concept, called Integrated Accessibility of Contaminant Source (IACS), has been proposed to consider simultaneously the positioning of a contaminant source, the distribution of occupants along with the overall airflow pattern. 84 cases with different combinations of contaminant sources and ventilation style in a full-scale room have been investigated numerically for that study. From the results obtained, some rules are proposed to advise the best ventilation strategies for different situations.

For that study, numerical simulations along with full-scale laboratory experiments have been carried out to investigate the influence of the porous screens on the temperature fields, flow fields and ventilation rates within the kitchen.The air exchange rate and the age of the air in the kitchen were measured with the tracer gas concentration decay method. Concerning the understanding of the temperature and flow distributions, a CFD analysis was performed.

The modified T-method can be applied to the prediction of the flow distribution in multi-fan duct systems. The method has been tested on the single-fan duct system presented in the ASHRAE handbook, the results obtained were in adequation with those published. So a symetry of a two-fan duct system has been investigated. It worked well. In order to evaluate the capability of the modified T-method simulation for multi-fan duct systems, a bathroom ventilation system in a 20 storey residential building was tested . The results are satisfactory.

For that study CFD models have been developed to simulate the transport of infectious droplets and bioaerosols in a hospital ward. Those models will help for the design and control of a local exhaust ventilation (LEV) system. Details of the CFD models are reported in this paper along with the analyses of the distribution and suspension time of droplets and bioaerosols with respect to their size, emission direction and emission speed.

A subjective study is reported in that paper concerning a field environmental chamber (FEC) equipped with a displacement ventilation system (DV). The aim of that work was to investigate effects of temperature gradient and room air temperature on local discomfort due to air air movement at different thermal sensations.

The installation of upper-room ultraviolet germicidal irradiation (UVGI) devices in ventilated rooms can reduce the transmission of infections by an airborne route. That study investigates the relationships between the lamp location, the lamp power, ventilation power and room heating in a small ventilated room. The results are presented.

To investigate the effect of the headroom on de displacement ventilation (DV) system, a numerical simulation applying a validated CFD model was used. The simulation and comparison of two different headroom heights in a space was carried out. The results are presented.

The ventilation system of an operating theatre in an hospital minimises the risk of airborne infection. In this paper, the integrated effect of medical lamp position and diffuser discharge velocity on ultra-clean ventilation performance in an operating theatre is reported. Their use appears to slightly affect the thermal comfort environment , but it can have a serious effect on the movement of infectious particles that can increase the cross infection rislk.

The roles of CFD in building design are presented in this paper such as designing a thermally comfortable, healthy and energy-efficient building. The developing trends in applying CFD to building design are analyzed by reviewing the literature. in all the proceedings of the International Conference on Building simulation.

Results of 3 years of measurements in the chemistry department building of the university of Athens are summed up in this paper. Levels of CO, CO2, SO2, NO2, Cl2, HCHO, O3 and TVOC werre measured in laboratories, classrooms and offices. A questionnaire survey was conducted too concerning working conditions and perception of IAQ. Results and comments are presented.