DETERMINATION OF VENTILATION EFFICIENCY IN RESIDENTIAL PREMISES

Feijó-Muñoz, Jesús; de la Fuente Casado, Beatriz; San José Alonso, Julio; Castro Ruiz, Francisco; Villafruela Espina, Jose Manuel. 
Conference: Climamed 2005 - Madrid

Ventilation is the process that enables de substitution of a premise polluted indoor air, supplying fresh air, being trough natural or mechanical means. Without taking into account is the supplied air diffuses through all the enclosure or if it displaces the pollutants present in all the premise. In order to evaluate the quality of ventilation the ventilation efficiency concept is used, a difficult to measure parameter due to the large amount of parameters on which it depends. Ir is intended to create a tool able to determine ventilation efficiency in residential premises. This is achieved introducing the mean-age-of-the-air concept, knowing if the air diffusion turns out correctly, regardless of the number of air renovations per hour, which value is specified by reculations. A model has been created through a CFD numerical code that calculates age-of-the-air, simulating natural ventilation in a specified enclosure. Following that, experiments are carried out in a testing chamber of same dimensions as the one in the simulated model, and through tracer gas techniques and photoacustical spectrography the age-of-the-air at the most representative points is obtained. This way numerically acquired results can be validated. 

Keywords: Age-of-the-air, Efficiency, Ventilation, Tracer Gases