Evaluation of the impact of fan coil airflow velocity on the micron particles distribution in the human breathing zone

Nowadays,most people spend their time in the interior spaces.Therefore,particulate pollutants in these spaces are serious threat to the health of human.Hence,the investigation on distribution and deposition of particle pollutants in indoor spaces is important for assessing indoor air quality.Due to the wide use of fan coils in interior spaces for cooling and heating,in this article the effect of fancoil airflow velocity on the concentration of micron particles of1,10and100microns in the breathing zone of seating(0.9 to 1/1meter) and standing(1.5to1.7meters)people has been studied.For this purpose,by using the computational fluid dynamics and the solver package developed by the authors in OpenFoam,the particle concentration is investigated in a room with a fancoil airflow velocity at1.5and3 m/s.The results show that large particles(100 microns)have a small effect on air quality and settle down after10seconds,in the other hand the smaller particles(10and1micron)have a major impact on ventilation conditions and they settle down after more time(about800seconds).The results indicate that the fan coil velocity increases,also the results show that more particles are filtered by the filter in the fancoil by increasing fancoil velocity and the percentage of particles deposited on the floor reduced.For example,for10microns particles,by increasing fan coil velocity from1.5to3m/s,the percentage of particles deposited on the floor is reduced from26%to17%.