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Indoor Air Flow and Pollutant Removal in a Room with Task Ventilation
Author(s) -
Fisk W.J.,
Faulkner D.,
Pih D.,
McNeel P.J.,
Bauman F.S.,
Arens E.A.
Publication year - 1991
Publication title -
indoor air
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.387
H-Index - 99
eISSN - 1600-0668
pISSN - 0905-6947
DOI - 10.1111/j.1600-0668.1991.04-13.x
Subject(s) - displacement ventilation , room air distribution , ventilation (architecture) , airflow , environmental science , ceiling (cloud) , dead space , smoke , volumetric flow rate , simulation , environmental engineering , meteorology , engineering , waste management , mechanics , structural engineering , medicine , mechanical ventilation , mechanical engineering , physics , anesthesia
We studied the performance of a task ventilation system that permits occupants to control the flow rate and direction of air supplied to their work space through four floor‐mounted supply grill. Air exited the room through a ceding‐mounted return grill. To study air‐flow patterns, we measured the age of air at multiple locations using a tracer gas stepup. To study the intra‐room transport of tobacco smoke particles, cigarettes were smoked mechanically in one workstation and particle concentrations were measured at multiple locations. Our major findings were as follows: (1) deviations from uniform age of air, and uniform particle concentration, were generally less than 30 percent; (2)some supply air short‐circuits to the return grill when directed toward the return with high velocity; (3) low supply velocities resulted in a floor‐to‐ceiling displacement flow; (4) directing the supply air toward the occupant, of partially toward the occupant, typically yielded an age of air at the occupant's breathing level that was 15 to 25 percent lower than the age at other breathing‐level locations; (5) with low supply velocities und air directed toward the occupants, tobacco smoke particle concentrations in a ventilated non‐smoking workstation were 50 percent of the chamber‐average concentration.