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Wind turbulence effect on ventilation engineering

Département des Technologies Solaires (LITEN)

01-09-2017

SL-DRT-19-0036

xavier.faure@cea.fr

Ventilation systems in buildings, whether mechanical by extraction, mechanical by insufflation, natural or hybrid, are subjected to the effects of wind. Depending on the orientation of the outlet / inlet ports, the pressure conditions can substantially change the air change rates. A better understanding of the effects of wind and particularly the up to day neglected turbulence effects would allow a better understanding of the interactions with the ventilation systems and contribute to the development of tools for ventilation engineering (finer dimensioning Ventilation systems and development of hybrid ventilation strategies). The increasing energy performance of buildings, from the first regulations to now, brings ventilation systems to the forefront of equipment for regulating indoor ambiances from both an energy and health point of view. In the present subject, wind turbulence and pressure fluctuations generated inside the building will have to be considered with regard to the envelope leackage (and the dynamics of water diffusion within it), the times delay of ventilation devices and sources of internal pollutants. The identification of the effects contributing to or opposing the air renewal should consider the different balances between the mechanical and natural effects (aerodynamics and thermal) and their dynamics.

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