Abstract
The control strategy for the supplement fan and the damper of hybrid ventilation system is very important point of the system performance. The hybrid ventilation system using a pressure difference sensor for monitoring the exhaust airflow rate and two air supply systems were installed on a test house. Performance of this ventilation system was evaluated through the field measurement. The results of the measurements revealed that the exhaust airflow rate was relatively stable while the indoor-outdoor temperature difference varied and the wind velocity changed. The air supply system through the crawl space(Case B) showed better results for the stability of exhaust airflow rate against the outdoor environment than the passive air supply system (Case A). Totally, the exhaust airflow rate of Case A, Case B met almost the target airflow rate in 60%, 69% of the measuring period respectively. Case B showed better result about the balance of ventilation airflow rate of the first and the second floor, too.
