At a point-source release, point-wise concentrations may greatly exceed the well-mixed conditions. In order to examine this assumption, aerosols have been released in a test room with HEPA filter ventilation, at different conditions of room furnishings and different contaminant release locations. The aerosol concentrations were measured simultaneously, for each experiment, at seven locations by nephelmetry.

The investigation of natural ventilation with the software package COMIS (Conjunction of Multizone Infiltration Specialists) in a typical building in Serbia was the aim of that study. Results show that a good IAQ cannot be achieved with natural ventilation by infiltration in that building during summer.

This study reveals the effects that porous residential buildings have on the natural ventilation performance and on the cooling load reduction too. Two residential building models using CFD analysis and thermal and airflow network analysis are evaluated. Results show that improvements in the natural ventilation performance would reduce the cooling load.

The examination of the effects of cross-ventilation when a porous hedge is placed ahead of a residential building is presented in this paper. For the prediction of the airflow characteristics around both the porous hedge and the building, a CFD simulation has been carried out. Results and conclusions are presented.

For the evaluation of IAQ in ventilated rooms, local mean age of air is an important index.To model the spatial-temporal mass distribution in an imperfectly mixed forced ventilated installation, a data-based mechanistic approach was used. The model proved efficient to determine the age of air in a ventilated place.

This study aims at checking the viability of natural ventilation in urban environment, especially in street canyons. Reduced wind velocity, urban heat island, noise, pollution are barriers for a natural ventilation in town. The effects of those barriers have been quantified and the models developed can be used in the initial stages of building design , mainly in street canyons.

The differences and similarities between natural and mechanical wind in built environment are the subject of this paper. In that aim, a spectral analysis is applied to study the natural and mechanical wind characteristics in different conditions. In the end, the influence of spectral characteristics on human sensation for airflow are presented.

For that study a CFD steady state computational model of a public transport interchange (PTI) in Hong Kong has been used for the investigation and prediction of the typical pollutant emission pattern for buses. The effectiveness of displacement ventilation (DV) scheme often used for PTI, for the removal of pollutants, has been investigated with the numerical simulation. An alternative model is then proposed with a different location of supply and exhausts to improve thermal comfort and IAQ.

CFD has been applied to calculate the flow in a kitchen hood system at operating conditions. Fluent code was used to solve the governing equations (mass, momentum, energy and turbulence).The predicted characteristics curves of the hood ventilator and load coefficients appear to be in good agreement with the experimental data.

During winter 2000-2001, a field study was performed to investigate the thermal environment and the thermal comfort in residential buildings in Harbin, China. 120 participants answered subjective questionnaires and provided sets of physical data. For the collection of the measured parameters of indoor environment, predicted mean vote (PMV) and predicted percentage of dissatisfied (PPD), an indoor climate analyzer and a thermal comfort meter were used. The conclusions of that field study are presented.