Effectiveness of personal ventilation system using relative decrease of tracer gas in the first minute parameter

On a prototype system for local air-conditioning named personal microclimate system (PERMICS), ventilation effectiveness was measured. A new parameter based on the relative decrease of tracer gas in the first minute of system operation has been introduced, its usefulness has been verified by simulation results from commercial CFD software. This new parameter makes possible quick measurements of the local efficiency of ventilation systems.