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Comparison of ventilation performance of three different air supply devices - A measurement study
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system. Division of Energy Systems, Department of Management and Engineering, Linköping University, Sweden.ORCID iD: 0000-0003-3472-4210
2015 (English)In: Ventilation 2015: Proceedings of the 11th International Conference on Industrial Ventilation / [ed] Li Z., Li X., Zhang X., and Taipale A., International Conference on Industrial Ventilation , 2015, Vol. 1, 359-366 p.Conference paper (Refereed)
Abstract [en]

People today spend a significant part of their time in an indoor environment, whether it be home, school, vehicle or workplace. This has put greater demands on indoor air, in terms of both air quality and thermal comfort. The main objective of building ventilation is to take care of pollutants and lower their concentration, but it is also used to cool or heat indoor air. However, exchanging air in a room creates indoor air movements, which can have a major influence on the perception of thermal comfort inside the building. The use of ventilation systems also affects energy use and CO2 discharge to the environment. Therefore it is important to optimize the ventilation system with respect to both indoor climate and energy demand. The aim of this paper was to study the behavior of three different ventilation supply systems, i.e., mixing supply device, displacement supply device and confluent jet supply device, in an office room. The measurements for the present paper were carried out in a special test room at the University of Gᅵᅵvle, Sweden. The room is well insulated and specially designed for full-scale experiments. The size of the room corresponds to a normal office, to produce a heat-load corresponding to an occupied office room with a computer and a person-simulator placed in the middle of the room. The lighting system was working inside the office room during all the experiments. Twelve different cases have been studied experimentally with different airflow rates, supply air temperature and supply devices. The results show that the confluent jets ventilation with the device placed at 2.2 m provides the highest value of ventilation efficiency, followed by displacement ventilation, while the lowest ventilation efficiency is found in the mixing ventilation system. The temperature gradient looks like what one can expect for both mixing and displacement, and confluent jet is a combination of these two. The results also show that the confluent jets ventilation system provides lower air temperature in the occupied zone compared to both displacement and mixing ventilation.

Place, publisher, year, edition, pages
International Conference on Industrial Ventilation , 2015. Vol. 1, 359-366 p.
Keyword [en]
Air; Air quality; Atmospheric temperature; Buoyancy; Carbon dioxide; Energy utilization; Fighter aircraft; Indoor air pollution; Measurements; Mixing; Thermal comfort, Air exchange efficiencies; Building ventilations; Displacement ventilation; Jet ventilations; Mixing ventilation; Supply air temperature; Ventilation efficiency; Ventilation performance, Ventilation
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:hig:diva-22741ScopusID: 2-s2.0-84987970991ISBN: 978-000000000-2OAI: oai:DiVA.org:hig-22741DiVA: diva2:1045959
Conference
11th International Conference on Industrial Ventilation, Ventilation 2015, 26-28 October 2015, Shanghai, China
Available from: 2016-11-11 Created: 2016-11-11 Last updated: 2017-01-03Bibliographically approved

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