Influence of building airtigthness on ventilation losses

Résumé et principaux résultats

Communication à la 21ème Conférence de l'AIVC, 26-29 September 2000, La Haye
Abstract : The Building Air Tightness is an important parameter on ventilation systems performance and energy losses. Yet, the total amount of leakage is as important on performances as their effective position in the room. Some calculations have been run according to prEN 13465 from TC156 WG2 for different buildings (single house, dwellings and commercial buildings) varying air tightness, value and repartition for different ventilation systems (natural, mechanical exhaust, mechanical exhaust and supply). All these calculations have been compared focusing on ventilation losses during heating season in Paris. Some double zone calculations on the commercial building (offices and stock area) have also been run to be compared to uniform single zone repartition. Calculations confirm the importance of air tightness on ventilation losses and show variations due to repartition hypothesis which must therefore be chosen carefully. Very often, air-tigthness value and its repartition are unknown and the hypothesis made on calculations are most important on results.