Convection in loose-Fill attic insulation—measurements and numerical simulations
Paper i proceeding, 2004

The objective of this study is to investigate the influence of convection on the thermal performance of loose-fill attic insulation under realistic climatic conditions. Measurements have been performed in a large-scale attic test model to determine heat transfer through the attic floor due to convection. Natural convection occurs in low-density materials only, leading to an increase in heat flow through the insulation and, thus, to a decrease in the thermal resistance of the insulation. The measurements show that the critical modified Rayleigh number for the low-density attic insulation in the studied setup is 22 to 25. At a modified Rayleigh number of 34, the thermal resistance of the insulation in the attic test model is only 75% of the highest measured thermal resistance.


Paula Wahlgren

Chalmers, Bygg- och miljöteknik, Byggnadsteknologi

Thermal Performance of the Exterior Envelopes of Whole Buildings

21668469 (eISSN)


9th International Conference on Thermal Performance of Exterior Envelopes of Whole Buildings 2004
Clearwater, USA,



Annan materialteknik


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