Simplified model for thermal comfort, IAQ and energy savings in rooms conditioned by displacement ventilation aided with transient personalized ventilation

摘要

The aim of this work is to evaluate the performance of an intermittent personalized ventilation (PV) system assisting a displacement ventilation (DV) system based on its ability in improving thermal comfort and protecting occupants from floor emitted passive contaminants. A simplified transient mathematical model was developed of heat and species transport to predict the temperature and concentration fields in the macroclimate room air, in the thermal plume induced by the occupant and internal heat sources and within the intermittent PV jet facing the occupant face at a fixed distance. The model's predictions of temperature and concentration were experimentally validated for a PV frequency range [0.3-1 Hz] in a climatic chamber conditioned with a DV system assisted with an intermittent PV jet. Good agreement was found between the predicted and measured values of temperature and concentration of tracer gas in the different regions of macroclimate air, thermal plume, and PV jet.