Hot-box measurements to investigate the internal convection of highly insulated loose-fill insulation roof structures

Henna Kivioja, Juha Vinha

Tutkimustuotos: ArtikkeliScientificvertaisarvioitu

9 Sitaatiot (Scopus)
63 Lataukset (Pure)

Abstrakti

The purpose of this study was to investigate how internal convection in loose-fill insulations affects the insulation properties of highly insulated roof structures. This study consists of laboratory measurements of roof structures insulated by two different blown-in insulations. The measurements are repeated with two temperature differences and air velocities for 300 mm and 600 mm thick insulation layers both with and without trusses, making a total of 24 case studies. The measurements were conducted with equipment using the calibrated hot-box method. The results of the tests show that internal convection can reduce insulation capacity significantly, especially with low-density loose-fill insulations, such as blown-in glass wool. A critical evaluation should be performed as to whether international standards and national building regulations take internal convection into account adequately. According to this study, 5 should be used as a critical modified Rayleigh number for horizontal roof structures with an open upper surface when used insulation material is loose-fill glass wool or wood fibre insulation as in this study.

AlkuperäiskieliEnglanti
Artikkeli109934
Sivumäärä10
JulkaisuEnergy and Buildings
Vuosikerta216
DOI - pysyväislinkit
TilaJulkaistu - 1 kesäk. 2020
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Julkaisufoorumi-taso

  • Jufo-taso 2

!!ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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