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TECHNICAL PAPERS: Conduction

Subtle Issues in the Measurement of the Thermal Conductivity of Vacuum Insulation Panels

[+] Author and Article Information
Francis C. Wessling, Marlow D. Moser, James M. Blackwood

Department of Mechanical and Aerospace Engineering, The University of Alabama in Huntsville, 301 Sparkman Dr. TH N270, Huntsville, AL 35899

J. Heat Transfer 126(2), 155-160 (May 04, 2004) (6 pages) doi:10.1115/1.1683674 History: Received May 09, 2003; Revised January 12, 2004; Online May 04, 2004
Copyright © 2004 by ASME
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References

Figures

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Insulation panels are shown between the cold plates. The thin heater is sandwiched between the panels. The entire assembly is suspended in the vacuum chamber. Tubes covered by radiation shielding supply coolant to the cold plates.
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Close-up of top of test assembly: (1) 25.4 mm aluminum cold plates; (2) 12.5 mm vacuum insulation panels; (3) 0.16 mm thin foil heater between the vacuum insulation panels; and (4) C-clamps on four corners to hold assembly together.
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Top corner of test assembly with thin threaded rod replacing C-clamp
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Uncorrected measured thermal conductivity versus the average of heater and cold plate temperatures with the thin heater and no C-clamps. Data are for heater temperatures at the chamber wall temperature, 10 deg above the chamber wall temperature, and 10 deg below the chamber wall temperature.
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Uncorrected measured thermal conductivity versus the average of heater and cold plate temperatures with the thick heater and C-clamps. Data are for heater temperatures at the chamber wall temperature, 10 deg above the chamber wall temperature, and 10 deg below the chamber wall temperature.
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Corrected measured thermal conductivity versus the average of heater and cold plate temperatures with the thin heater and no C-clamps. Data are for heater temperatures at the chamber wall temperature, 10 deg above the chamber wall temperature, and 10 deg below the chamber wall temperature.
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Corrected measured thermal conductivity versus the average of heater and cold plate temperatures. These data show that the difference between heater temperatures at the chamber wall temperature, 10 deg above the chamber wall temperature, and 10 deg below the chamber wall temperature are within the uncertainty of the measurement and are therefore not differentiated.
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Test assembly with thick heater and radiation “shield.” Radiation from heater and edges of vacuum insulation panel reflects from radiation “shield” to cold plates.

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