Experimental Investigation of the Influence of Obstacle in the Room on Passive Night-Time Cooling using Displacement Ventilation

Michal Zbigniew Pomianowski, Farzad Khalegi, Giedrius Domarks, Jonas Taminskas, Karol Bandurski, Kit Kristine Madsen, Søren Gedsø, Rasmus Lund Jensen

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Night-time ventilation is a promising approach for reducing the energy needed for cooling buildings without reducing thermal comfort. The objective of this paper is to determine how an internal obstacle, such as a table, will influence the heat transfer in the room and the efficiency of night-time ventilation which uses displacement ventilation. Experimental work was conducted on the basis of the work in a similar previous study, performed by (Artmann 2010), and this is an extension of that work. Experimental results obtained for a case with a table were compared with the results obtained by Artmann et al. for a room with displacement ventilation, but without table. The results obtained in the experiment with the table indicated that the mean heat flux was slightly lower but very similar compared to the case without the table. The heat flux at the ceiling was measured to be the same for both setups, whereas the heat flux at the floor was lower for the setup with the table. For the room with the table, especially for low air change rates, temperature efficiency is slightly reduced. Finally, experimental results indicate that there are no significant differences in heat discharged by the night time ventilation for the room with and without table.
Original languageEnglish
Title of host publicationProceedings of the 9th Nordic Symposium on Building Physics : NSB 2011
EditorsJ. Vinha, J. Piironen, K. Salminen
Number of pages8
VolumeVolume 1
Place of PublicationTampere, Finland
PublisherTampere University Press
Publication date2011
ISBN (Print)978-952-15-2574-2
Publication statusPublished - 2011
EventThe 9th Nordic Symposium on Building Physics (NSB 2011) - Tampere, Finland
Duration: 29 May 20112 Jun 2011


ConferenceThe 9th Nordic Symposium on Building Physics (NSB 2011)
Internet address

Bibliographical note

PDF for print: 8 pp. The proceedings is also published on a cd. (ISBN 978-952-15-2577-3)


  • Passive Cooling
  • Displacement Ventilation
  • Night-Time Ventilation
  • Experiments
  • Heat Transfer
  • Temperature Efficiency

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