The REinforced EXhaust System (REEXS) is a local ventilation principle for industrial ventilation with improved efficiency for capturing contaminants released by working processes .This paper discusses the validation of a 3D CFD model for the determination of the capture efficiency of standard local exhaust ventilation systems.That study has shown good results in 3 ways :- Properly designed REEXS hoods , compared to conventional exhaust devices have a significant increase capture efficiency.- CFD is an excellent tool to predict different local ventilation strategies in a quantitative way.

This paper presents the results of the performance of a wall-mounted natural ventilation convector under real winter weather conditions. The monitoring results were used as boundary conditions for CFD simulation to investigate the air movement in the test room. The results proved that the convector contributed greatly to the improvement of the indoor air quality.

This paper aims at developing and implementing a fuzzy controller for naturally ventilated building.The first objective of this research was to develop and then validate a rule based controller which can vary the resistance of ventilation opening in order to maximise comfort conditions.

This paper studies the climatic suitability to natural ventilation, which depends on energy saved for cooling and on the presence of driving forces such as wind and buoyancy. It may be assessed by estimating the distribution of temperature differences : difference between indoor and upper limit of comfort zone temperature for the energy saved, difference between indoor and outdoor temperature for the buoyancy effect.

This paper is a presentation of a detailed mathematical simulation along with an experimental investigation of airflow in solar chimneys carried out with an experimental apparatus whose most of the variables could be changed during the experiments. It is a chimney channel with changeable channel thickness and inclination angle.
The simulation model used proved very useful to simulate solar chimneys performance. It can predict flow rates for a wide range of variables.

A newly proposed method for evaluating ventilation performance of various types of window openings is presented with its experimental validation. The experimental system has been designed by means of wind tunnel techniques. The local similarity model of cross-ventilation is used for the application of that method.

LES (Large Eddy Simulation) has bben used to simulate cross ventilation under various wind direction angles. A new model, named local similarity model of cross ventilation, is proposed to estimate cross-ventilation flow rate and inflow angle at opening. In order to validate the proposed model, a wind tunnel experiment using a building model was carried out. The results confirm that dynamic similarity is established almost regardless of wind direction angle and position of the opening.

This paper is a description of a numerical method that aims at analysing three-dimensional natural convection in rooms with wide openings.A 3D CFD tool is proposed to predict the airflow pattern and the heat and mass transfer inside a heated office room connected to a corridor via a doorway.Results have been compared to experimental data obtained in full-scale : the CFD predictions agree with the experimentally observed features.

The effect of a solar chimney along with a solar screen on the effectiveness of natural ventilation is investigated in this paper.The benefit of the combination of both systems is that it enhances the natural ventilation flow through the building and improves the environmental comfort.

The study of buoyancy-driven natural ventilation in buildings requires windless conditions. It is difficult to conduct on-site measurements since the nature has few windless moments so a full-scale test room placed in a large laboratory environment can create artificially such conditions but it is an expensive method. CFD methods using two different models (RANS and LES) provide an alternative approach to study natural ventilation in buildings.