RESULTS. Experiments in-situ WP 2, experiments after intervention
report
This report presents the outcomes of Work Package 2 (WP2) within the CLAIRE project, which investigates ventilation properties in primary schools and long-term care facilities. The primary aim is
to enhance understanding of aerosol behavior under various ventilation systems and develop simplified methods to assess ventilation performance. The report focuses on measurements conducted before and after interventions of the ventilation system in eight primary school classrooms, with a comparison to earlier results from the ‘before intervention’ measurements. The methodology involved selecting representative classrooms and determining critical measurement positions based on room geometry, ventilation system typology, and user behavior. Measurements included particle concentration dynamics, the air velocity from three directions, and ventilation efficiency. Key outcome parameters were:
• 100-fold increase time: Time for particle concentration to rise significantly.
• 100-fold recovery time: Time for particle concentration to decrease after emission stops.
• tdelay: Time delay between emission and detection at measurement points.
• Local Air Changes per Hour (ACHlocal): Proxy for ventilation rate.
to enhance understanding of aerosol behavior under various ventilation systems and develop simplified methods to assess ventilation performance. The report focuses on measurements conducted before and after interventions of the ventilation system in eight primary school classrooms, with a comparison to earlier results from the ‘before intervention’ measurements. The methodology involved selecting representative classrooms and determining critical measurement positions based on room geometry, ventilation system typology, and user behavior. Measurements included particle concentration dynamics, the air velocity from three directions, and ventilation efficiency. Key outcome parameters were:
• 100-fold increase time: Time for particle concentration to rise significantly.
• 100-fold recovery time: Time for particle concentration to decrease after emission stops.
• tdelay: Time delay between emission and detection at measurement points.
• Local Air Changes per Hour (ACHlocal): Proxy for ventilation rate.
Topics
TNO Identifier
1006180
Publisher
TNO
Collation
219 p.
Place of publication
Delft