Experimental investigation of the effect of personalized ventilation system on distribution of temperature, velocity and draught discomfort in an office environment

In this research, it has been tried to experimentally investigate the the effect of personalized ventilation system on air flow and temperature distribution in a room for two inlet air temperatures (24 and 32°C) and two different arrangements of the inlet diffusers (desk-mounted and under-desk air terminals). The results showed that the penetration depth of heat and momentum due to the inlet diffuseres were not the same; So that the effect of inlet diffusers’ temperature on the room temperature distribution is significant up to a distance of about 60 cm. However, the effect of inlet velocity is noticeable up to a distance of about 110 cm. As a result, the occupants’ thermal sensations up to about one meter from the inlet diffusers will be affected by the inlet conditions. Also, the results indicated that the draught dissatisfaction along with the diffusers’ centerline is significant to a distance of about 180 cm. Also, based on the results, the air velocity and turbulence intensity are the two main factors in determining the draught dissatisfaction in the personalized ventilation system and due to the rapid thermal mixing of inlet air with the room air, the effect of inlet temperature on the draught dissatisfaction is not significant.