The aim of that research is to obtain contaminant concentrations in a room, to perform qualitative and quantitative comparison for a wall jet air inlet and a ceiling diffuser air inlet, and to determine more efficient inlet and outlet configuration. The effect of air inlet types in mixing ventilation was investigated in an experimental room under two conditions, with no occupant and with an occupant present north of the source. The results have shown that the air inlet type is an important physical determinant to the distribution of airborne contaminant concentrations.

How the contaminants disperse in a personalized ventilation room has to be studied carefully in so far the contaminant distribution determines IAQ. This paper deals with the investigation by CFD of the dispersion of particles in a room ventilated by a personalized ventilation system. In that aim a three-dimensional model is employed, airflow and temperature distribution is simulated after experimental validation. The results of the different simulations are presented.

The indoor air quality is influenced in the long term by the chemical contaminants emitted by dried building material. The aim of this paper is to simulate the indoor total volatile organic compounds (TVOCs) distribution emitted from a new floor along with the total TVOCs quantity inhaled by an occupant with the different fresh air ratios under a re-circulated ventilation system. The simulation results and analysis are a great help to design the indoor healthy occupant environment and to improve some features of the re-circulated ventilation system.

One of the common approaches for assessing indoor pollutant level is the continuous sampling. Alternative sampling schemes taking shorter measurements were proposed. For that study a year round indoor CO2 concentration at 17 locations in a typical office in Hong Kong was used to evaluate the probable errors using four sampling schemes :
A - a continuous sampling throughout the measurement
B - 2 sampling periods of 2 equal sessions of the measurement
C - 2 structural sampling periods of the 2 sessions of the measurement

A numerical study of assessment of the performance of a windcatcher using CFD is presented in this paper. A 500 mm square windcatcher system connected to the room has been modeled for different wind speeds in the range of 0.5-6 m/s and four different wind directions. The numerical results agree with the published experimental results of a wind tunnel experiment. The windcatcher system is found to be an efficient way to channel fresh air into the room.

In both airspeed and thermal fields, a scale-model study of an non-isothermal ceiling slot-ventilated enclosure was investigated. Semi-empirical prediction equations have been established. Results have also been compared with previous researches for the validation of the physical behaviour of air-jet. That analysis of airflow performance in a non isothermal condition makes progress in predicting air quality inside the enclosures and it guides the design concepts of ventilation system for an indoor environment.

That study demonstrated the capability of CFD to predict buoyancy-driven displacement natural ventilation flows in a single-storey space connected to an atrium. The CFD simulations were carried out with and without ventilation openings at the bottom of the atrium. The predictions agreed well with the analytical models and the experiments.

The investigation of the effect of the position of doors on performance of the displacement ventilation system was the aim of this paper. A validated CFD simulation was used. It appeared that doors can cause a lateral movement of airflow disrupting the convection effect the displacement ventilation system relies on.

A field measurement and computational energy simulations have been carried out for that study, to examine the effectiveness of commonly used passive climate control methods for naturally ventilated residential buildings in Singapore. Concerning building orientation, faade construction, special roof system and window shading device , their effect on thermal environment and cooling load have been studied. It appears that the most efficient method to reduce the room cooling load is to use the special roof system as thermal buffer.

A theoretical and experimental modelling of a room with low and high level openings is described in this paper with heating distributed at multiple levels. The introduction of an intermediate opening is analyzed too.