This paper reports the design concept and outline of that task ambient air conditioning system with natural ventilation along with the measurement results.

The existing analytical models for the purging of excess buoyancy by displacement and mixing ventilation have been extended to allow the authors the simulation of natural ventilation with time-varying vent areas.The resulting analytic solutions have been applied to a typical office to obtain predictions. Those predictions have then been compared to those based on a constant vent area model .

An experimental study was carried out to articulate the relationship between indoor thermal radiant environment and comfort in naturally ventilated room space is presented. Two identical-shaped wooden buildings were used for the experiment : one with external shading and the other more conventional with lower levels of thermal insulation, heat capacity and solar control. There was a significant difference in the comfort sensation votes. Measurements were made, using the measured data, the authors found a relationship between the radiant exergies and the votes of thermal comfort.

The aim of that study was to determine the best technical method for the measurement of ventilation rate in naturally ventilated buildings. First, a literary survey was performed on the current methods : traditional tracer gas method appears the most reliable technique, but the accuracy of the method could be increased by a better understanding of the mixing within the whole system. For that reason the whole volume has been divided into fictitious zones and the interaction between them has been considered.

Three new efficiency measures are defined based on the buoyancy distribution with the space. The first one is a time-averaged efficiency for a space considered as a whole. The second is an instantaneous measure for the whole space. And the third one is a local time-averaged measure with an efficiency profile.

That numerical study confirms the high efficiency of that new device for ventilation and cooling application : the air-jet device with moving parts. It is of great interest in so far its geometry generates a self oscillating flow that provides a uniform distribution of air. A wide range of velocities and geometry parameters is studied that provide information for its design.

In 2000, two similar blocks of flats with clean and effective ventilation system and low emitting building materials were built for people with respiratory illnesses. They have centralized supply and exhaust air system, either demand or user controlled. During four years they have been tested, the results show the benefits of demand controlled ventilation compared with user controlled one.

The ventilation of underground car parks is essential to avoid health problems. The aim of that study is to assess the impact of the use of axial ventilators (jet fans) suspended under the car park ceilings. That CFD analysis should be validated with experimental measurements.

For that work, a numerical study is carried out to define the optimum airside system design of tomb air ventilation systems, that will provide the best comfort and healthiest conditions with optimum energy use. A CFD software, FLUENT, was used. It appears that adding air outlets to serve the side rooms at the end of Ramses IV tomb axis, helps in lowering the relative humidity to acceptable limits.

For that study, the transfers of air across revolving doors have been observed , in that aim a small-scale laboratory model was used that revealed the existence of a critical revolution rate , where transfers are maximal for a given combination of door geometry, revolution rate and temperature constrast. So two transfer regimes for revolving doors are possible. The potential implications to heat losses across the doorway and ventilation driven by the door are discussed in that paper.