Experimental Investigation of the Influence of Different Flooring Emissivity on Night-Time Cooling using Displacement Ventilation

Jérôme Le Dréau, Line Røseth Karlsen, Michal Litewnicki, Lars Lund Michaelsen, Anders Møllerskov, Håkon Ødegaard, Louise Svendsen, Rasmus Lund Jensen, Anna Joanna Marszal

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1065 Downloads (Pure)

Abstract

Night-time ventilation is a promising approach to reduce the energy needed for cooling buildings without reducing thermal comfort. The objective of the present paper is to determine how different emissivity of flooring influence the heat transfer in a room and the efficiency of night-time ventilation using displacement ventilation. Experimental work was conducted on the basis of the work performed by Artmann et al. (2009) in a similar previous study. An aluminum-foil floor cover was installed in a full scale test room. Experimental results obtained with aluminum flooring were compared to results obtained by Artmann et al. with a flooring consisting of expanded polystyrene (EPS). Results showed that the surface temperature of the floor decreased with decreasing emissivity. Mean convective heat fluxes were similar for experiments conducted with both EPS and aluminum-foil floor cover, but it was seen that the emissivity of the flooring affected the heat transfer ratio at the internal surfaces. The convective heat flux increased at the ceiling and decreased at the floor for experiments with aluminum flooring compared to the experiments with EPS floor. Temperature efficiency was slightly higher for experiments with aluminum flooring than for EPS floor. As the efficiency was only a bit higher with an extremely low emissivity of the floor cover, it was concluded that the influence of different emissivity of floor covers can be neglected concerning efficiency of displacement night-time ventilation.
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
Pages491-498
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
http://webhotel2.tut.fi/nsb2011/

Conference

ConferenceThe 9th Nordic Symposium on Building Physics (NSB 2011)
CountryFinland
CityTampere
Period29/05/201102/06/2011
Internet address

    Fingerprint

Bibliographical note

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

Keywords

  • Night-Time Ventilation
  • Emissivity
  • Displacement Ventilation
  • Convective Heat Flux
  • Floor Covering
  • Aluminum-Foil

Cite this

Le Dréau, J., Karlsen, L. R., Litewnicki, M., Michaelsen, L. L., Møllerskov, A., Ødegaard, H., Svendsen, L., Jensen, R. L., & Marszal, A. J. (2011). Experimental Investigation of the Influence of Different Flooring Emissivity on Night-Time Cooling using Displacement Ventilation. In J. Vinha, J. Piironen, & K. Salminen (Eds.), Proceedings of the 9th Nordic Symposium on Building Physics: NSB 2011 (Vol. Volume 1, pp. 491-498). Tampere University Press.