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Experimental study on augmentation of mixing within a stratified indoor environment by erosion of density interface
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, Energisystem och byggnadsteknik. (Energy Systems)ORCID-id: 0000-0002-2171-3013
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap.
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, Energisystem och byggnadsteknik. (Energy Systems)ORCID-id: 0000-0003-1121-2394
2023 (engelsk)Inngår i: E3S Web of Conferences, 2023, Vol. 396, artikkel-id 02037Konferansepaper, Publicerat paper (Fagfellevurdert)
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.  

sted, utgiver, år, opplag, sider
2023. Vol. 396, artikkel-id 02037
Serie
E3S Web of Conferences, ISSN 2555-0403
Emneord [en]
Stratification, Mixing, Density interface, Water model, Pasive houses
HSV kategori
Forskningsprogram
Hållbar stadsutveckling
Identifikatorer
URN: urn:nbn:se:hig:diva-41918DOI: 10.1051/e3sconf/202339602037Scopus ID: 2-s2.0-85164475352OAI: oai:DiVA.org:hig-41918DiVA, id: diva2:1761025
Konferanse
IAQVEC 2023. 11th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, Tokyo, 20-23 May 2023
Tilgjengelig fra: 2023-05-31 Laget: 2023-05-31 Sist oppdatert: 2023-07-24bibliografisk kontrollert

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Kabanshi, AlanSandberg, Mats

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