DBPapers
DOI: 10.5593/sgem2011/s18.115

THE AIR DISTRIBUTION SYSTEMS EFFICIENCY IN SCHOOLS - MEASUREMTS AND CFD SIMULATIONS

AUTHOR/S: R. NAGY, I. SENITKOVA
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 3, 101-108 pp

ABSTRACT

Well organized ventilation systems and air distributions of the school buildings in many
countries still appear to be a topical issue. A lot of various investigations indicated that
IAQ problems appear not only because of low ventilation rates, but also in cases when
the location of exhausted and mainly supply jets is not appropriate. The main motivation
is the select of most efficiency air ventilation systems and distribution schemes to
improve IAQ for school buildings. The model of university classroom for presented
experimental investigations was used. The model room is especially used for these
measuring purposes. The floor area of model is 62 m2 and the ceiling height is 3.1 m.
Occupancy simulators and furniture arrangements were designed to fit the field
measurement conditions. To produce the heat-load corresponding to fully occupied
classroom, heat source-simulators were placed in the room. Also carbon dioxide
concentrations were simulated by 21 CO2 person-simulators which were placed in the
room in breathing zone of sitting person (1.05 m above the floor). The main objective of
research has been to explore transport and pollutants distribution at 5 different
ventilation systems - displacement ventilation system (DV), mixing ventilation system
(MV), personal ventilation system (PV), confluent ventilation systems (CV) and
naturally ventilation – air infiltration (NV) in identical classrooms. Within the frame of
ventilation systems were used at summary 17 distribution schemes for selected
ventilation systems. The field measurements in-situ (tracer gas technique by CO2) and
CFD simulations in IESVE software for 5 different ventilation principles confirmed that
the indoor air quality in the schools is generally unacceptable (out of category I, II and
III) by lower ventilation rates for NV because of not respecting the occupancy density.
Some distribution schemes of MV, DV and PV represent better level of indoor air
quality.

Keywords: CFD simulations, mixing ventilation, displacement ventilation, confluent ventilation, personal ventilation, air distribution index, carbon dioxide

PAPER 2011/s18.115: THE AIR DISTRIBUTION SYSTEMS EFFICIENCY IN SCHOOLS - MEASUREMTS AND CFD SIMULATIONS

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