Overview of ventilation strategy for a theatre building.

In France, the performance of ventilation systems in existing buildings is poorly understood today and rarely checked. This article shows how a verification method for ventilation system performance, currently in operation in Sweden, can be applied in France.

Explains the importance of taking into account several parameters, one of which being the effect of the installation of the ventilator into the circuit, when analysing ventilator energy consumption.

States that quite simple formulae can be used for humid air, but that this is not the case for humid temperature. Gives an overview of the iterative method to be used in this case.

Economic and polyvalent, numerical simulation, or computational fluid dynamics (CFD) lends itself to the topic of air diffusion. An overview of this useful modelling strategy.

Developed in the 80s in Scandinavia, the principle of cooling and heating by ceiling beam now comprises a large element of current techniques for the conditioning of large buildings in northern Europe, the UK, Germany and the Benelux countries, and for several years now also in France. Describes the principles of chilled beam conditioning.

The most carefully calculated and designed air conditioning installation will not be comfortable for the occupants unless the air diffuser is chosen correctly. It is the determination of the former which will enable a zone to have a homogenous temperature at all points and an absence of noxious draughts in the occupation zone. The classic large scale air diffuser therefore is the intermediary between installation of air conditioning and the premises to be conditioned. Discusses the role of the air diffuser in detail.

The Ajust'Air concept makes it possible to adjust between the entry loss of fresh air and the extraction of tainted air in the locality following the ventilation requirements marked by the carbon gas parameter.

Modulated ventilation would seem to be an interesting solution, capable of satisfying the demands of air quality in commercial buildings while avoiding thermal losses. The article gives an overview of this type of ventilation system.

In order to adapt ventilation losses to the actual use of the premises one must aim to control the energy loads due to air renewal while at the same time ensuring the maintenance of good indoor air quality for comfort and hygiene for the occupants. The principle applications are premises presenting wide variations in occupation: number of occupants, but also effective hours of use. These systems are effective and economic, but they must be designed and installed correctly.