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Chair Fans as Energy Efficient Strategy to Aid Localized Ventilation

Carine Habchi, Kamel Ghali, Nesreen Ghaddar

2016/5/20

Abstract

Nowadays, the air conditioning industry is deviating from the conventional mixing ventilation technique towards localized ventilation. Displacement ventilation and ceiling personalized ventilation are localized systems presenting a high potential in insuring good indoor air quality while reducing the energy consumption compared to mixing ventilation. In this work it is proposed to enhance their performance by assisting them with chair fans controlling the behavior of occupants’ convective plumes.

Computational fluid dynamics models were developed to simulate office spaces ventilated by displacement ventilation and ceiling personalized ventilation equipped with chair fans. The Lagrangian technique was adopted to track particle trajectories to determine particle behavior after generation from occupant respiratory activity. A parametric study was conducted to assess the effect of chair fan flow rate on each system performance in terms of indoor air quality.

Recommendations were given to reduce cross-infection between occupants for both types of localized systems studied with reduced energy consumption. The total chair fans flow rate was optimized for both cases to insure acceptable indoor air quality resulting in significant energy savings. It was found that the optimal total chair fans flow rate per occupant was approximately 14 L/s when assisting displacement ventilation while it was 10 L/s when aiding ceiling personalized ventilation.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ),Vol. 1, Nº. 14
Pages:785-790 Date of Publication: 2016/5/20
ISSN: 2172-038X Date of Current Version:2016/5/4
REF:453-16 Issue Date: May 2016
DOI:10.24084/repqj14.453 Publisher: EA4EPQ

Authors and affiliations

Carine Habchi, Kamel Ghali, Nesreen Ghaddar
Department of Mechanical Engineering, American University of Beirut. Lebanon

Key words

Thermal plumes, chair fans, displacement ventilation, ceiling personalized ventilation, energy consumption

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