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

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

A chilled beam is a source of natural convection, creating a flow of cold air directly into the occupied zone. Experiments have been conducted in a mock up of an office room to study the air velocities in the occupied spaces. In addition, velocity profiles of a passive beam are registered with underneath heat loads when the cool and warm air flows interact. Experimental laboratory study shows that the underneath heat gains, even when no upward plume is generated and the dummy only affects as a flow obstacle, have a significant effect on the velocity profile. Furthermore in an actual occupied office environment, the thermal plumes and the supply air diffuser mix effectively the whole air volume. The maximum air velocity measured was still below 0.25 m/s with the high heat gain of 164 W/m(2). The results demonstrate that a simplified analysis of an undisturbed convection flow can not accurately describe air movement and draught risk.

Original languageEnglish
Title of host publicationFIRST INTERNATIONAL CONFERENCE ON BUILDING ENERGY AND ENVIRONMENT, PROCEEDINGS VOLS 1-3
EditorsJJ Liu, TF Zhang, ZQ Zhai
Pages1263-1270
Number of pages8
Publication statusPublished - 2008
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Building Energy and Environment - Dalian, China
Duration: 13 Jul 200816 Jul 2008
Conference number: 1

Conference

ConferenceInternational Conference on Building Energy and Environment
Abbreviated titleCOBEE
CountryChina
CityDalian
Period13/07/200816/07/2008

Keywords

  • chilled beam
  • thermal plume
  • air diffusion
  • draught risk

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