Verification of response time of CO₂ Concentration Sensors for measuring Age of Air Distribution using Dynamic Steady-State Concentration

This study applies the concept of dynamic steady-state concentration in air recirculation system that treats the exhaust and return air and re-supplies back into the room such as air purifier et al. To verify the response time of general-purpose sensors needed for multipoint measurement using unsteady concentration data, chamber tests were conducted using three CO₂ concentration sensors and multi gas monitor in airtight chamber. As a result, response time of fan-mounted and pump-connected general-purpose sensors become a little slowly than that of multi gas monitor. However, if an active method using high response sensor modules than general-purpose sensors or connecting pump et al, it is possible to ensure high response time equivalent to multi gas monitor even if general-purpose sensors is used.