Mid Sweden University

miun.sePublikasjoner
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Diagnosis of buildings' thermal performance - a quantitative method using thermography under non-steady state heat flow
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande. (Ekoteknik)ORCID-id: 0000-0001-5356-7471
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande. (Ekoteknik)
2015 (engelsk)Inngår i: Energy Procedia, ISSN 1876-6102, Vol. 83, s. 320-329Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study describes a quantitative method using thermography to measure the thermal performance of complete building envelope elements that are subjected to non-steady state heat flow. The method presumes that thermal properties of external walls, like conductivity, could still be obtained by a linear regression over values of independent measurements. And therefore could be used during fluctuating indoor and outdoor thermal conditions. The method is divided into two parts. First, the convection heat transfer coefficient is measured by heat flux meters (HFM) and thermography. And then, the overall heat transfer coefficient of a complete building element is measured by thermography to include all non-uniformities.

In this study the thermal performance of a 140 mm thick laminated timber wall was measured. The wall was subjected to the outdoor weather conditions in Östersund, Sweden during January and February. The measurement values were found to have a large disparity as expected due to the rapid change in weather conditions. But still a linear regression with low confidence interval was obtained. The thermography results from a small uniform wall segment were validated with HFM measurements and 4% difference was found, which suggest that the two methods could be equally effective. Yet, thermography has the advantage of measuring surface temperature over large area of building element. The overall heat transfer coefficient of a large wall area was found to be 11% higher in comparison to the HFM measurements. This indicates that thermography could provide a more representative result as it captures areas of imperfections, point and linear thermal bridges.

sted, utgiver, år, opplag, sider
2015. Vol. 83, s. 320-329
Emneord [en]
heat transfer coefficient, convection, thermal transmittance, conductivity, infrared imaging
HSV kategori
Identifikatorer
URN: urn:nbn:se:miun:diva-27174DOI: 10.1016/j.egypro.2015.12.186ISI: 000368675200032Scopus ID: 2-s2.0-84958152570OAI: oai:DiVA.org:miun-27174DiVA, id: diva2:908699
Tilgjengelig fra: 2016-03-03 Laget: 2016-03-03 Sist oppdatert: 2023-08-28bibliografisk kontrollert

Open Access i DiVA

Diagnosis of buildings’ thermal performance(682 kB)1128 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 682 kBChecksum SHA-512
7346368581bc72ec92350ab6992bdf516e7dcc7218146c0ec164b6ea08661a43901c2feeb34dcbb2884f793a0979b66f5fe3af9f6d4310186f29a810db07a308
Type fulltextMimetype application/pdf

Andre lenker

Forlagets fulltekstScopus

Person

Danielski, ItaiFröling, Morgan

Søk i DiVA

Av forfatter/redaktør
Danielski, ItaiFröling, Morgan
Av organisasjonen
I samme tidsskrift
Energy Procedia

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 1128 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 520 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf