| Keywords |
Hybrid Ventilation ; Air change rate ; Ventilation effectiveness ; Tracer gas |
| Abstract |
Hybrid ventilation is the building ventilation system that integrates natural ventilators for air supply and mechanical ventilation components. It creates a negative pressure in air duct with an exhaust fan to prevent the backflow of air into the room and has advantage of preventing condensation of water vapor by the absolute humidity control. The purpose of the study is to identify the apartment ventilation performance in applying the hybrid ventilation system. Ventilation experiments were performed with concentration decay method using tracer gas. The six experimental conditions were set by an exhaust fan, natural ventilators and windows opening. Ventilation performance was evaluated by average air change rate, room mean age of air and ventilation effectiveness. When the exhaust fan was activated, the air change rate was found over 0.5 ACH and the value of ventilation effectiveness was over 0.5. Those results indicate that the fan-assisted hybrid ventilation system satisfies the criteria of a designed ventilation rate and the completely mixed indoor air condition in two experimental apartments that have different floor plan. |