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Experimental evaluation of an intermittent air supply system: Part 1: Thermal comfort and ventilation efficiency
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering. Center for the Built Environment, University of California, Berkeley, USA. (Energy Systems)ORCID iD: 0000-0002-2171-3013
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering. (Energy Systems)
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering. (Energy Systems)
2016 (English)In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 95, 240-250 p., 4263Article in journal (Refereed) Published
Abstract [en]

Spaces with high occupancy density e.g.; classrooms, auditoriums and restaurants, provide challenges to ventilate at a lower energy use due to elevated temperatures. To meet occupants’ thermal comfort requirements traditional systems use a lot of energy. Alternative ventilation strategies that optimize high air movements in the occupied zone allow human activities at elevated temperatures while attaining improve occupants’ perception and acceptance of the indoor climate at a low energy use. This paper presents an experimental evaluation of a novel ventilation strategy for high occupancy spaces that provides fresh air and thermal comfort in the sitting zone through a controlled intermittent air jet system. The strategy uses ceiling mounted high momentum air jet diffusers (AJD) made from ventilation duct fitted with nozzles that generate confluent jets. The jets coalesce into a single two-dimensional jet which is directed downwards in the sitting zone. This paper presents an experimental evaluation/analysis of the proposed system with regard to ventilation efficiency and thermal comfort measurements in a classroom mockup. Results show that the system qualifies to be used as a primary ventilation system and has local air change index > 1 inside the jet, and a ventilation efficiency > 50%. The system also provides better thermal climate than mixing and displacement ventilation at elevated temperatures.

Place, publisher, year, edition, pages
2016. Vol. 95, 240-250 p., 4263
Keyword [en]
Air jet diffuser, Ventilation strategy, Tracer gas, Ventilation efficiency, Thermal comfort, Occupancy density
National Category
Civil Engineering Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:hig:diva-20212DOI: 10.1016/j.buildenv.2015.09.025ISI: 000367699800022ScopusID: 2-s2.0-84943329317OAI: oai:DiVA.org:hig-20212DiVA: diva2:851628
Available from: 2015-09-07 Created: 2015-09-07 Last updated: 2016-06-30Bibliographically approved

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Kabanshi, AlanWigö, HansSandberg, Mats
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