Air Distribution Performance Inside Office Room with Combined Displacement and Personal Ventilation

Abstract

The main goal of the paper is to study the effect of adding a new type of ventilation device, which is personal ventilation to displacement ventilation, and know its effect on heat removal and how to reach thermal comfort for humans. Experiments were practically conducted inside a thermally insulated room with full-scale of dimensions (3 ϗ 1.75 ϗ 3) m. The results of the experimental work are used to validate the CFD simulations. The RNG k-e model is utilized to simulate the cases for predicting indoor airflows. The displacement ventilation supply temperature is close to 18°C and the flow velocity of 0.25 m/s. As for the personal ventilation, the flow rates 5l/s and 10l/s were taken with a temperature close to where the air was drawn (at height 0.4 m). It was concluded that adding personal ventilation improved air quality and thermal comfort, and it was also concluded that a flow rate of 10 l/s gave better efficiency for the device to function in terms of air distribution performance index and effectiveness of temperature (e.t) which about 71% and 1.8 respectively.