Heat flow through fibrous insulation heated from below
Conference
·
· Journal of the Tennessee Academy of Science; (USA)
OSTI ID:5498691
- Tennessee Technological Univ., Cookeville (USA)
The use of increased levels of thermal insulation in residential attics has renewed interest in the onset of convection in a horizontal porous media heated from below and open at the top. A review of the literature and solutions for the equations of energy, motion, and continuity give conditions for thickness, air flow permeability, apparent thermal conductivity and temperature difference for the onset of convection. The calculated values for the Rayleigh number at the onset of convection (Ra{sub c}) are combined with physical property data for commonly used thermal insulations to predict the temperature and insulation thickness combinations that give Ra{sub c}. Estimates of the effect of internal convection on thermal resistance will be discussed.
- OSTI ID:
- 5498691
- Report Number(s):
- CONF-8911221--
- Conference Information:
- Journal Name: Journal of the Tennessee Academy of Science; (USA) Journal Volume: 65:2
- Country of Publication:
- United States
- Language:
- English
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