Impact of heat load location and strength on air flow pattern with a passive chilled beam system

Risto Kosonen*, Pekka Saarinen, Hannu Koskela, Alex Hole

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

31 Citations (Scopus)


A passive chilled beam is a source of natural convection, creating a flow of cold air directly into the occupied zone. Experiments were conducted in a mock-up of an office room to study the air velocities in the occupied spaces. In addition, velocity profiles are registered when underneath heat loads exist and the cool and warm air flows interact. Experimental laboratory study revealed that in the case of the underneath heat gains, even no upward plume was generated and the dummy only acted as a flow obstacle, having a significant effect on the velocity profile. Furthermore, in an actual occupied office environment, the thermal plumes and the supply air diffuser mixed effectively the whole air volume. The maximum air velocity measured was still below 0.25 m/s with the extremely high heat gain of 164 W/m(2). The results demonstrate that analysis methods were the interaction of convection flow and jet are not taken into account could not accurately describe air movement and draught risk in the occupied room space. (C) 2009 Published by Elsevier B.V.

Original languageEnglish
Pages (from-to)34-42
Number of pages9
JournalEnergy and Buildings
Issue number1
Publication statusPublished - Jan 2010
MoE publication typeA1 Journal article-refereed
EventInternational Conference on Building Energy and Environment - Dalian, China
Duration: 13 Jul 200816 Jul 2008
Conference number: 1


  • Chilled beam
  • Thermal plume
  • Air diffusion
  • Convection flow
  • Draught risk

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