Assessment of improvement brought by humidity sensitive and hybrid ventilation/HR-Vent project

Introduced for the first time at 25th AIVC Conference in Prague in September 2004, the HR-Ventproject still delivers new rich teachings since its start in January 2004. Until December 2005, morethan 700 million data have been recorded on 180 extract units in 5 occupied collective buildingslocated in NANGIS (France). Directly linked to the local meteorological data, these measurements aim at evaluating the ability of the new installed hybrid ventilation system to erase the back draught effects as well as to improve the natural draught and the connected gas appliance operation ; They also allow to show the effectiveness of the connected humidity sensitive extract grilles in the wet rooms by recording every minute the data of relative humidity, temperature, pressure and opening surface. All these data are measured by specifically developed sensors integrating a high accuracy low pressure manometer.Specific and statistical analysis on pressures and airflow, comparisons between rooms, betweenstoreys and buildings, influences of wind speed and outdoor temperatures are very interestingteachings for all of us who need a really significant monitoring to improve their knowledge onnatural and hybrid ventilation behavior.The first results can particularly show the IAQ and energy effectiveness in a microscopic view as in amacroscopic analysis.