Performance study on hybrid ventilation system with air supply from crawl space using a test house

Ventilation is one of the most important measures to dilute indoor air pollutants. In order to maintain a clean indoor air environment, not only the total ventilation rate of the building but also the distribution of outdoor air to each area must be taken into consideration. A performance evaluation of the combined system of air supply from the crawl space and hybrid exhaust ventilation with a small fan and damper has been investigated. This investigation was undertaken over a heating season using a full-scale test house. The ventilation airflow rate and the distribution to each room of the test house were measured by the constant concentration method. The influence of indoor-outdoor temperature difference on ventilation rate was also analyzed. Additionally, the performance of this system was investigated by numerical analysis. The results revealed the performance of this ventilation system.