Effect of Thermal Plume on Personal Thermal Comfort in Displacement Ventilation at One Side of the Room

摘要

The Indoor Zero-Equation Turbulence Model in software Airpak was adopted to simulate the personal thermal comfort in the condition of displacement ventilation at the left side. The parameters of the simulated environment were 25 ℃ and 40%. The simulated results show that over the person, there was a clear phenomenon of thermal plume which entrains the around air resulting in the decrease of the temperature with the increasing of the height. As for the predicted mean vote (PMV) and the percent person's dissatisfied (PPD), their gradient were depended on the temperature distribution formed by thermal plume, and the average value was 0.249 for PMV and 7.25% for PPD. All these show that the effect of thermal plume cannot be neglected in the design of HVAC system.