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.

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.