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PIV STUDY OF VENTILATION QUALITY IN CERTAIN OCCUPIED REGIONS OF A 2D ROOM MODEL WITH RAPIDLY VARYING FLOW RATES
KTH/HiG.
HiG.
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The use of supply jet flows is the most common type of air distribution for general ventilation in industrial premises. Usually the supply flow rate is constant or slow varying (VAV-systems) to cope with a varying load. A novel air distribution method, with the potential to reduce stagnation and to increase the ventilation efficiency, is to introduce rapid flow variations (pulsations). In the paper we report on a fundamental study of this type of air distribution. The purpose of the study was to explore the effect on stagnant zones and the levels of the kinetic energy and the relative turbulence intensity. The study was conducted in a small-scale, two-dimensional (2-D) room model with water as operating fluid. The size of the model made it possible to investigate the 2-D velocity vector field in certain occupied regions using Particle Image Velocimetry (PIV) method and further consequent analyses have been done from the resulted vector fields. The comparison between cases of constant inflow and pulsated inflow (flow variations with frequency of 0.5 Hz) have been conducted for three domains, two belonging to the far-field occupied zone and one belonging to the near-field, downstream of the supply wall jet.

Place, publisher, year, edition, pages
2012.
Keyword [en]
PIV, ventilation, varying flow rate, room model
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Civil and Architectural Engineering; Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-149301OAI: oai:DiVA.org:kth-149301DiVA: diva2:738877
Conference
The 10th International Conference on Industrial Ventilation, 17-19 September 2012, Paris
Note

QC 20140825

Available from: 2014-08-19 Created: 2014-08-19 Last updated: 2014-08-25Bibliographically approved

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Citation style
  • apa
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  • ieee
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  • de-DE
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