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The air distribution as an indicator for energy consumption and performance of ventilation systems
University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för energi- och maskinteknik. School of Construction Management and Engineering, University of Reading, United Kingdom.
School of Construction Management and Engineering, University of Reading. (Energy and Environment)
University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för energi- och maskinteknik. Division of Energy Systems, Department of Management and Engineering, Linköping University .ORCID iD: 0000-0003-3472-4210
2008 (English)In: Journal of the Human-Environment System, ISSN 1345-1324, Vol. 11, no 2, 77-84 p.Article in journal (Refereed) Published
Abstract [en]

This paper deals with the energy consumption and the evaluation of the performance of air supply systems for a ventilated room involving high- and low-level supplies. The energy performance assessment is based on the airflow rate, which is related to the fan power consumption by achieving the same environmental quality performance for each case. Four different ventilation systems are considered: wall displacement ventilation, confluent jets ventilation, impinging jet ventilation and a high level mixing ventilation system. The ventilation performance of these systems will be examined by means of achieving the same Air Distribution Index (ADI) for different cases.The widely used high-level supplies require much more fan power than those for low-level supplies for achieving the same value of ADI. In addition, the supply velocity, hence the supply dynamic pressure, for a high-level supply is much larger than for low-level supplies. This further increases the power consumption for high-level supply systems.The paper considers these factors and attempts to provide some guidelines on the difference in the energy consumption associated with high and low level air supply systems. This will be useful information for designers and to the authors' knowledge there is a lack of information available in the literature on this area of room air distribution.The energy performance of the above-mentioned ventilation systems has been evaluated on the basis of the fan power consumed which is related to the airflow rate required to provide equivalent indoor environment. The Air Distribution Index (ADI) is used to evaluate the indoor environment produced in the room by the ventilation strategy being used. The results reveal that mixing ventilation requires the highest fan power and the confluent jets ventilation needs the lowest fan power in order to achieve nearly the same value of ADI.

Place, publisher, year, edition, pages
2008. Vol. 11, no 2, 77-84 p.
Keyword [en]
ventilation, air distribution index, energy, CFD, modelling, indoor environment
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:hig:diva-17896DOI: 10.1618/jhes.11.77OAI: oai:DiVA.org:hig-17896DiVA: diva2:761885
Available from: 2014-11-09 Created: 2014-11-09 Last updated: 2017-01-03Bibliographically approved

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Publisher's full texthttps://www.jstage.jst.go.jp/article/jhes/11/2/11_2_77/_article

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CiteExportLink to record
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Citation style
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