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Is building ventilation a process of diluting contaminants or delivering clean air?
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)
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, Energy Systems and Building Technology. (Energy Systems)
2019 (English)In: Indoor + Built Environment, ISSN 1420-326X, E-ISSN 1423-0070Article in journal (Refereed) Epub ahead of print
Abstract [en]

The purpose of this paper is to discuss the performance of air distribution systems intended for dilution of contaminants (e.g. mixing ventilation) and those intended for delivery of clean air to local regions within rooms (e.g. personalized ventilation). We first start by distinguishing the systems by their visiting frequency behaviour. Then, the performance of the systems with respect to their possibility to influence contaminant concentration in the room or regions within the room is dealt with. Dilution capacity concept for mixing systems is discussed, and delivery capacity concept for systems intended to deliver clean air locally is introduced. Various ways for supply of clean air to regions within the room are presented and their pros and cons are discussed. In delivery capacity systems, the most important single parameter is the entrainment of ambient air into the primary supply flow. Therefore, methods of determining entrainment in these systems need to be defined and the results should be included when describing the performance of the air terminal devices.

Place, publisher, year, edition, pages
Sage Publications, 2019.
Keywords [en]
Probability to return, Visitation frequency, Dilution capacity, Delivery capacity, Entrainment, Entrainment mixing factor
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:hig:diva-29401DOI: 10.1177/1420326X19837340OAI: oai:DiVA.org:hig-29401DiVA, id: diva2:1297967
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-08-09Bibliographically approved

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Sandberg, MatsKabanshi, AlanWigö, Hans

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