Experimental results in a testing room with mixing ventilation were used to define two new ways of designing the inlet airflow in order to ensure comfort. The first way uses the assumption that air velocities are only a function of the Archimedes number, which provides curves showing air velocity in the occupied zone as function of inlet air temperature and velocity. The second way results from an analytical calculation of the penetration length of the air jet in the room and the distance where it enters the occupied zone.

Different geometries to simulate a person in an indoor environment numerical simulation have been evaluated with respect to local and global air flows, as well as convective heat transfer. Results show that the geometry of the computer simulated person influences only the local flow around it.

A simplified methodology for numerical simulation of air flows around and above ventilated chairs in a theater or auditorium has been developed. It uses a simplified method for describing the air diffuser geometry (N-point momentum model), a simplified turbulence model (zero-equation turbulence model) and an error pretreatment method. It has been applied to a room ventilated through air supply openings in the chair bases. Simulation results (air temperature and velocity distributions) show good agreement with experimental data.

A multizone air flows simulation code (IDA MAE) was used to evaluate a hybrid ventilation system (passive stack with assisting fans) in a Swedish school (9350 m2 - 20 classrooms), in the framework of the HYBVENT project (Annex 35 of IEA). Simulation was operated with 18 zones. Results show the sensitivity of air flows to changes in wind speed and direction.

Design process of buildings currently addresses indoor air quality through ventilation flow rates requirements. In some circumstances, this approach may be not sufficient and an alternative is to determine ventilation rates through contaminant-based design methods. The authors present several examples of such approach, especially using multizone modeling (CONTAMW model) in a two-story classroom/office building equipped with a CO2 demand-controlled ventilation.

Laboratory experiments were performed to evaluate the effect of different CO2-based demand-controlled ventilation strategies (on/off, proportional, linear, PID) on energy consumption and indoor air quality, with various ventilation rates and occupancy profiles, and with one- or two-zones controls. Results show the capability of different strategies to maintain acceptable indoor CO2 level with the minimum outdoor air requirement.

A specially designed garment for direct physical measurement of both the convective and the radiative components of human heat loss was developped, using sensitive heat flux transducers housed in clothing pockets. Investigation with a human subject showed the advantages and the precautions to be taken using this equipment.

A procedure to verify, validate and report CFD analyses in indoor environment applications has been developed. The process on how to use this procedure is explained through the example of CFD modeling of an office with mechanical displacement ventilation.

Ventilation airflow rates and internal air distribution were measured in four poultry slaughter plants (250 to 775 workers), equipped with negative pressure ventilation systems (exhaust flow rate from 7.1 to 27.4 m3/s - no air intakes - supply air entering through various openings). Results lead the authors to recommend the installation of diffusers for makeup air supply, changes in the organisation of rooms to avoid contamination of one by the other and regular maintenance and cleaning of ventilation components.

An audit of 20 hospital operating rooms was operated in Grece in order to collect information about the HVAC installations and the indoor physical parameters. Data were also collected from 560 medical personnel through a questionnaire about the assessment of the indoor conditions.