Determination of radiative properties of fiberglass and foam insulations

Technical Report · Tue Dec 01 04:00:00 EST 1987

OSTI ID:5189548

Yajnik, S; Roux, J A

The spectral radiative properties of 1450(b) high density fiberglass, 1451 low density fiberglass, and expanded polystyrene were inverted from monochromatic directional-hemispherical reflectance and hemispherical-directional reflectance data coupled with an analytical model in the wavelength range of 4 to 40 microns. A set of ten samples were prepared for each of the three insulation materials. The Willey 318S Fourier transform spectrometer (DTS) was utilized to measure the directional-hemisherical reflectance data in the wavelength range of 2-20 ..mu..m for the three sample sets. The hemispherical-directional reflectance data for the two fiberglass samples sets were obtained with a hemiellipsoidal reflectometer in the wavelength range of 4-40 ..mu..m. From the directional-hemispherical reflectance data, the spectral absorption and scattering coefficients were inverted for the three test insualtions using the non-linear least squares approach coupled with Chandrasekhar's discrete ordinates solution of the radiative transport equation. These radiative properties together with the true thermal conductivity values for fiberglass and foam insulations were used to compute typical heat transfer results which were then compared to experimental data where available. An optimization analysis was conducted for the fiberglass insulations to determine the bulk density at which the steady-state heat transfer through the fiberglass layer insulation was a minimum. 32 refs., 37 figs., 19 tabs.

• Research Organization: Mississippi Univ., University (USA). Dept. of Mechanical Engineering
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5189548
• Report Number(s): ORNL/Sub-86-55930/1; ON: DE88007845
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320107* -- Energy Conservation
Consumption
& Utilization-- Building Systems-- (1987-)
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
COLLOIDS
DATA
DISPERSIONS
ENERGY TRANSFER
EXPERIMENTAL DATA
FIBERGLASS
FOAMS
FOURIER TRANSFORMATION
HEAT TRANSFER
INFORMATION
INTEGRAL TRANSFORMATIONS
MATERIALS
NUMERICAL DATA
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
SPECTRAL REFLECTANCE
SYNTHETIC MATERIALS
THERMAL CONDUCTIVITY
THERMAL INSULATION
THERMODYNAMIC PROPERTIES
TRANSFORMATIONS