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Experimental study on augmentation of mixing within a stratified indoor environment by erosion of density interface
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology. (Energy Systems)ORCID iD: 0000-0002-2171-3013
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology. (Energy Systems)ORCID iD: 0000-0003-1121-2394
2023 (English)In: E3S Web of Conferences, 2023, Vol. 396, article id 02037Conference paper, Published paper (Refereed)
Abstract [en]

The current study aims to address the problem associated with warm air heating in passive houses. Warm air eating is cheaper and easy to operate in passive houses, however, this creates problems of shortcut ventilation and thermal discomfort due to stratification as warm air is confined to the ceiling. In the current study, we explore a new method of creating resonance between stratification frequency and the periodic variation of the ventilation supply frequency to increase mixing of the supplied warm air and the room air consequently destratifying the room conditions. A basic water model study is used to understand the interaction between the frequency variations and the resulting standing waves with stratification characteristics in a room. Measurements at three different input frequencies and at three input paddle locations have been performed, gathering vertical temperature gradients and visualization data from them. The results show the shift in the inversion point because of an increase augmentation across the inversion between the fluids with different densities close to resonance. There is also a dependency on paddle location showing that the type of ventilation system will have different mixing rates due to different fluid energetic behaviours.  

Place, publisher, year, edition, pages
2023. Vol. 396, article id 02037
Series
E3S Web of Conferences, ISSN 2555-0403
Keywords [en]
Stratification, Mixing, Density interface, Water model, Pasive houses
National Category
Fluid Mechanics and Acoustics
Research subject
Sustainable Urban Development
Identifiers
URN: urn:nbn:se:hig:diva-41918DOI: 10.1051/e3sconf/202339602037Scopus ID: 2-s2.0-85164475352OAI: oai:DiVA.org:hig-41918DiVA, id: diva2:1761025
Conference
IAQVEC 2023. 11th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, Tokyo, 20-23 May 2023
Available from: 2023-05-31 Created: 2023-05-31 Last updated: 2023-07-24Bibliographically approved

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Kabanshi, AlanSandberg, Mats

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Kabanshi, AlanChocarro de Erauso, BorjaSandberg, Mats
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Energy Systems and Building TechnologyDepartment of Building Engineering, Energy Systems and Sustainability Science
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