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.

In this paper, the proposition is to use free wind in order to create suction pressure within a ventilation duct with no consumption of commercial energy. The possibilities of this suction cylinder concept in a ventilation system are discussed. A CFD code was used for the simulation. The first results are promising

During renovation work of an old military building, the coal tar pitch that was used as a traditional water barrier, was left under the new carpeting. After the renovation, as office workers complained about bad and stuffy air, an AIAQ survey has been conducted . The VOCs were analyzed and determined by active sampling on TENAX TA sorbent, thermal desorption and gas chromatography. Most of the samples included the same volatile polycyclic aromatic hydrocarbons (PAHs) as the coal tar pitch did.

Air cleaning technologies for VOCs are not well established. One of them is (UVPCO) ultra-violet photocatalytic oxidation technology , practically studied only in laboratory settings, where relatively high concentrations of only few VOCs were employed.
This paper reports an experimental evaluation of the performance of UVPCO devices under real or simulated-real indoor conditions where many VOCs are present at low concentrations.