PREDICTING THERMAL CONDUCTIVITY USING ACOUSTIC PROPAGATION CONSTANT
In Situ Prediction of the Thermal Conductivity of Highly Porous Fiber Matrices Using Acoustic Propagation Constant: Experiment and Theory
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This monograph describes a novel technique for the prediction of the thermal performance of low density fiber glass insulation and other related fibrous insulation materials using anacoustic apparatus. The project aim is to create a technology for in situ quality control testing of such fiber glass batts during production yielding substantial cost savings for the manufacturer. The project scope is twofold - the development and validation of an experimental acoustic technique, and a model of the relationship between the heat transfer and acoustical attenuation. Experimental laboratory results s...
This monograph describes a novel technique for the
prediction of the thermal performance of low density
fiber glass insulation and other related fibrous
insulation materials using anacoustic apparatus. The
project aim is to create a technology for in situ
quality control testing of such fiber glass batts
during production yielding substantial cost savings
for the manufacturer. The project scope is twofold -
the development and validation of an experimental
acoustic technique, and a model of the relationship
between the heat transfer and acoustical
attenuation. Experimental laboratory results show
excellent correlation between the thermal
conductivity and the propagation constant.
Correlation of calculated propagation constant
magnitude versus measured thermal conductivity gave
an R2 of 0.94 for the range typically manufactured
fiber glass batt materials. Given the promise of
such highly correlated measurements, the acoustic
technique could be used to continuously predict the
thermal conductivity of the material during its
production, replacing current off-line methods. Test
cycle time is reduced from tens of minutes to
seconds.
prediction of the thermal performance of low density
fiber glass insulation and other related fibrous
insulation materials using anacoustic apparatus. The
project aim is to create a technology for in situ
quality control testing of such fiber glass batts
during production yielding substantial cost savings
for the manufacturer. The project scope is twofold -
the development and validation of an experimental
acoustic technique, and a model of the relationship
between the heat transfer and acoustical
attenuation. Experimental laboratory results show
excellent correlation between the thermal
conductivity and the propagation constant.
Correlation of calculated propagation constant
magnitude versus measured thermal conductivity gave
an R2 of 0.94 for the range typically manufactured
fiber glass batt materials. Given the promise of
such highly correlated measurements, the acoustic
technique could be used to continuously predict the
thermal conductivity of the material during its
production, replacing current off-line methods. Test
cycle time is reduced from tens of minutes to
seconds.
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