Thermal performance of residential attic insulation

Wilkes, K.E.; Rucker, James L.

doi:10.1016/0378-7788(83)90014-2

Cited by 24 publications

(15 citation statements)

References 7 publications

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“…The situation was exacerbated by the loose-fill product being applied in the field at much lower den ity than that used in laboratory evaluation of the material. Similar re ults on lo c-fill attic insulation were reported in Reference [3] .…”

supporting

confidence: 71%

Measured Thermal Resistance of Frame Walls with Defects in the Installation of Mineral Fibre Insulation

Brown

Bomberg

Ullett

et al. 1993

Journal of Thermal Insulation and Building Envelopes

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Envelopes, 16, Apr, pp. 318-339, 1993-04 Measured thermal resistance of frame walls with defects in the installation of mineral fibre insulation Brown, W. C.; Bomberg, M. T.; Ullett, J. M.; Rasmussen, J. Journal of Thermal Insulation and Building J. RASMUSSEN Rock111ool !lltematimwl AIS Hcdehusmc, DenmarkABSTRACT: Studies have shown that convective air flow can significantly reduce the thermal resistance of frame walls insulated with mineral fibre insulation (MFl). It has also been shown that convective air flow can be avoided if the MFI products arc installed with at least one face against an air impermeable material. The evolution of MFI products has seen the introduction of products with smaller fibre diameters and lighter densities, <.nci there is a dominance of the frame wall insulation market by friction fit products. The effect of these changes on the installed (field) performance of MFI products is unknown, as is the effect of"minor" installation defects on the performance of frame wall insulation systems. This article examines, through a program of full scale laboratory measurements, the effect of corner installation defects and product density on the thermal resistance of frame walls insulated with MFI products.

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supporting

confidence: 71%

Measured Thermal Resistance of Frame Walls with Defects in the Installation of Mineral Fibre Insulation

Brown

Bomberg

Ullett

et al. 1993

Journal of Thermal Insulation and Building Envelopes

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“…The measurements also indicated that attic ventilation has an effect on convection in the insulation material. Wilkes and Rucker (1983) published the first large-scale laboratory measurements of convection in attic insulation. They concluded that natural convection occurred in the insulation and that the critical modified Rayleigh number was much lower that the theoretical value.…”

Section: Large-scale Laboratory Measurementsmentioning

confidence: 99%

Overview and Literature Survey of Natural and Forced Convection in Attic Insulation

Wahlgren

2007

Journal of Building Physics

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This article presents an overview and a literature survey of convection in attic insulation. The study focuses on the onset of natural convection in the insulation, but also discusses the influence of forced convection. It covers experimental studies in small-scale measurement apparatus, large-scale laboratory measurements, in situ measurements, as well as numerical and theoretical work on convection in attic insulation. Suggestions for future work are also presented.

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“…Some experiments performed on loose-fill insulation [3] showed that the critical temperature differences for a 21.6-cm (8.5-in. )-thick layer and a 43.2-cm (17-in.…”

Section: Consequencf_£ Of Variable Permeabimty and Thicknf_ssmentioning

confidence: 99%

“…on one type of loose-fill insulation[3] showed that the effective conductivity for a temperature difference lower than 44.4°C (80°F)The thermal performances of various insulating materials are compared in terms of thermal resistance, or R-value.If a layer of insulation is subjected to a temperature difference A T, and if Q is the global heat flux through this layer, the R-value is calculated as follows: AT (4.7) Q This general definition is valid even when convection occurs within the insulation. In the absence of convection (conduction-radiation mode), the total heat flux through a Jt layer of insulation of thickness E is Q = k" --AT .…”

mentioning

confidence: 99%

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Numerical analysis of heat transfer by conduction and natural convection in loose-fill fiberglass insulation--effects of convection on thermal performance

Delmas¹,

Wilkes²

1992

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Thermal performance of residential attic insulation

Cited by 24 publications

References 7 publications

Measured Thermal Resistance of Frame Walls with Defects in the Installation of Mineral Fibre Insulation

Measured Thermal Resistance of Frame Walls with Defects in the Installation of Mineral Fibre Insulation

Overview and Literature Survey of Natural and Forced Convection in Attic Insulation

Numerical analysis of heat transfer by conduction and natural convection in loose-fill fiberglass insulation--effects of convection on thermal performance

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