Abstract
A workplace with desk, desk incorporated personalized ventilation (PV) and a dressed thermal
manikin with realistic body and surface temperature distribution were set in a test room (4.70
m x 1.62 m x 2.6 m). 15 L/s were supplied from a ceiling diffuser to ventilate the room at 26
oC air temperature. The PV consisted of two plane jets placed beside each other (confluent
jets) and along the front edge of the desk. The slots had dimensions: 0.06 m x 0.5 m (W x L).
The manikin was seated upright with abdomen pressed against the front edge of the desk. The
airflow supplied isothermally and upwards from the inner jet (closest to manikin) was the
same, twice bigger or twice lower compared to that of the outer jet. The mean velocity field at
the breathing zone was measured by Particle Image Velocimetry: a dual cavity laser (λ = 532
nm) and a CCD camera - 35 mm lenses. Glycerol droplets (seeding) were added to the total
volume air supply. The maximum absolute mean velocity measured near the manikin’s mouth
was 0.25 m/s, when the two confluent jets supplied 8 L/s each. Same velocity was measured
when the inner jet was supplying 8 L/s and the outer 4 L/s. The opposite combination, i.e.
outer jet 8 L/s and inner 4 L/s, resulted in lower velocity (0.13 m/s) compared to that of the
free convection layer alone: 0.20 m/s. The increased velocity at the face allowed more clean
air to be inhaled.
Original language | English |
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Publication date | 2012 |
Number of pages | 6 |
Publication status | Published - 2012 |
Event | 10th International Conference on Healthy Buildings - Brisbane Convention & Exhibition Centre, Brisbane, Australia Duration: 8 Jul 2012 → 12 Jul 2012 Conference number: 10 http://hb2012.org/ |
Conference
Conference | 10th International Conference on Healthy Buildings |
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Number | 10 |
Location | Brisbane Convention & Exhibition Centre |
Country/Territory | Australia |
City | Brisbane |
Period | 08/07/2012 → 12/07/2012 |
Internet address |
Keywords
- Personalized ventilation
- Control
- Confluent jets
- Free convection
- PIV