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The thermal performance of a green roof on a highly insulated building in a sub-arctic climate
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction. Building Envelope and Building Physics, Department of Building and Real Estate, Research Institutes of Sweden, 501 15 Borås, Sweden.ORCID iD: 0000-0003-2402-1845
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.ORCID iD: 0000-0003-0974-2142
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0002-4068-3905
2021 (English)In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 241, article id 110961Article in journal (Refereed) Published
Abstract [en]

Green roofs are complex systems, with a vegetation layer covering the outermost surface of the building shell. An effective design may confer environmental and energy benefits. Most field studies evaluating green roof performance have been conducted in warmer climates with few studies of full-scale green roofs in cold regions. No study has so far evaluated the energy performance of a green roof in a sub-arctic climate. This study demonstrates the heat flow and thermal effect of an extensive green roof versus a black bare roof area on a highly insulated building in the sub-arctic town of Kiruna, Sweden, for the period from November 2016 to February 2018. Measured temperature and heat flux values were consistently higher and more variable for the black roof than the green roof, except during the snow-covered winter months when the responses were similar. The cumulative heat flux showed that the net heat loss was greater through the black than the green roof, but the values remained low. Overall, the study confirms that the energy benefit of a green roof on a highly insulated building in a subarctic climate is low.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 241, article id 110961
Keywords [en]
Green roofs, Subarctic climate, Heat flux, Insulation, Full-scale test
National Category
Building Technologies
Research subject
Urban Water Engineering; Construction Management and Building Technology; Construction Engineering and Management
Identifiers
URN: urn:nbn:se:ltu:diva-83714DOI: 10.1016/j.enbuild.2021.110961ISI: 000648525000006Scopus ID: 2-s2.0-85103983858OAI: oai:DiVA.org:ltu-83714DiVA, id: diva2:1544753
Funder
Swedish Research Council Formas, 2014-854Interreg Nord
Note

Validerad;2021;Nivå 2;2021-04-16 (alebob)

Available from: 2021-04-16 Created: 2021-04-16 Last updated: 2021-06-03Bibliographically approved

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Schade, JuttaLidelöw, SofiaLönnqvist, Joel

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