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.
Författare
Paula Wahlgren
Chalmers, Bygg- och miljöteknik, Byggnadsteknologi
Publicerad i
Thermal Performance of the Exterior Envelopes of Whole Buildings
21668469 (eISSN)
art. nr 014Konferens
9th International Conference on Thermal Performance of Exterior Envelopes of Whole Buildings 2004
Clearwater, USA, 2004-12-04 - 2004-12-09
Clearwater, USA, 2004-12-04 - 2004-12-09
Kategorisering
Ämneskategorier (SSIF 2011)
Energiteknik
Annan materialteknik
Husbyggnad