Experimental research on effectiveness of personalized ventilation for a lying infant

Proposes a new personalized ventilation scheme in infant sleep environment. Carries out experiments by an infant thermal manikin, calculates the air age at different locations of the room and measures indoor pollutant residual concentration by the tracer gas attenuation method, and evaluates the effectiveness of the personalized ventilation system and compares with the fabric duct mixing ventilation system. Designs fifteen groups of working conditions for personalized ventilation with the supply air rate of 3 to 11 L/s and the supply air distance of 50 to 90 cm, and two groups of working conditions for fabric duct mixing ventilation with the supply air rate of 11 L/s and 40 L/s. The results show that with the personalized ventilation, outdoor air can not penetrate infant’s thermal plume only under the most unfavorable condition, the air ages in breathing zone under other working conditions are all less than 36 min, and the minimum value is 19.13 min. Personalized ventilation can reduce pollutant concentration by more than 50% in the first four minutes of operation, which is significantly faster than that of fabric duct mixing ventilation. With the same supply air rate, the air age in breathing zone under personalized ventilation is 51% less than that of mixing ventilation.