Автор |
McElroy, D., L. |
Автор |
Graves, R., S. |
Автор |
Yarbrough, D., W. |
Автор |
Moore, J., P. |
Дата выпуска |
1985 |
dc.description |
An unguarded, unidirectional heat flow technique is described for measuring the apparent thermal conductivity (Λ<sub>α</sub>) of insulating materials in the range 300 to 330°K. Vertical heat flow is generated by a 0.9 m by 1.5 m electrically heated nichrome screen that is instrumented and sandwiched between two test specimens. The test specimens are bounded by two temperature-controlled copper plates. The system has been used to measure Λ<sub>α</sub> of fiberglass batts and obtain data that show the effects of density, temperature, temperature difference, thickness, plate emittance, and heat flow direction on Λ<sub>α</sub>. A determinate error analysis indicates a Λ<sub>α</sub> measurement uncertainty of ± 1.7%. The system repeatability and reproducibility were found to be ± 0.2%. The measured performance of the tester agrees with that predicted by a thermal model. Analysis of the transient characteristics of the screen when it is subjected to a step change in power suggests that the apparatus can be used to determine apparent thermal diffusivity. |
Издатель |
SAGE Publications |
Тема |
Thermal Conductivity |
Тема |
Flat Insulation Tester |
Тема |
Thermal Modeling |
Тема |
Total Hemispherical Emittance |
Тема |
Screen Heater |
Тема |
Fiberglass Insulation |
Тема |
Thermal Insulation |
Тема |
Thermal Resistance |
Тема |
Unguarded Technique |
Название |
A Flat Insulation Tester that Uses an Unguarded Nichrome Screen Wire Heater |
Тип |
Journal Article |
DOI |
10.1177/174425918500900208 |
Electronic ISSN |
1744-2583 |
Print ISSN |
1744-2591 |
Журнал |
Journal of Building Physics |
Том |
9 |
Первая страница |
160 |
Последняя страница |
179 |
Аффилиация |
McElroy, D., L., Metals and Ceramics Division Oak Ridge National Laboratory P.O. Box X Oak Ridge, TN 37830 |
Аффилиация |
Graves, R., S., Metals and Ceramics Division Oak Ridge National Laboratory P.O. Box X Oak Ridge, TN 37830 |
Аффилиация |
Yarbrough, D., W., Metals and Ceramics Division Oak Ridge National Laboratory P.O. Box X Oak Ridge, TN 37830 |
Аффилиация |
Moore, J., P., Martin Marietta Energy Systems, Inc. Nuclear Division P.O. Box Y Oak Ridge, TN 37830 |
Выпуск |
2 |
Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
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Библиографическая ссылка |
14. Jury, S. H., McElroy, D. L., and Moore, J. P., “Pipe Insulation Testers, ” Thermal Transmission Measurements of Insulations, ASTM STP 660, R. P. Tye (ed.), American Society for Testing and Materials, pp. 310–326 (1978). |
Библиографическая ссылка |
15. Moore, J. P., McElroy, D. L., and Jury, S. H., “A Technique for Measuring the Apparent Thermal Conductivity of Flat Insulations, ” ORNL/TM-6494, Oak Ridge National Laboratory, Oak Ridge, TN (October 1979). |
Библиографическая ссылка |
16. Moore, J. P., McElroy, D. L., and Jury, S. H., “A Technique for Measuring the Apparent Thermal Conductivity of Flat Insulations, ” Thermal Conductivity 17, pp. 727–735, J. G. Hust (ed.), Plenum (1983). |
Библиографическая ссылка |
17. Turner, W. D., Elrod, D. C., and Siman-Tov, I. I., “HEATINGS5—An IBM 360 Heat Conduction Program, ” ORNL/CSD/TM-15, Oak Ridge National Laboratory, Oak Ridge, TN (March 1977). |
Библиографическая ссылка |
18. B. Braun Instruments, Thermomix 1480 and Frigomix 1495, San Mateo, CA. |
Библиографическая ссылка |
19. Astrodyne, Inc., Thermal Bond 312, Burlington, MA. |
Библиографическая ссылка |
20. Energy Control Products Projects 3M SCS-220, Experimental Solar Absorber Coating, St. Paul, MN 55144. |
Библиографическая ссылка |
21. Phoenix Wire Cloth, Inc., 40 × 40 Per Inch Nichrome V Wire, 0.10 inch, P.O. Box 610, Troy, Michigan 48084. |
Библиографическая ссылка |
22. McElroy, D. L. and Kollie, T. G., “The Total Hemispherical Emittance of Platinum, Columbium-1% Zirconium, and Polished and Oxidized INOR-8 in the Range 100 to 1200C, pp. 365–379 in Measurements of Thermal Radiation Properties of Solids, NASA SP31, Joseph C. Richmond (ed.) (1963). |
Библиографическая ссылка |
23. Tye, R. P., Desjarlais, A. O., Yarbrough, D. W., and McElroy, D. L., “An Experimental Study of Thermal Resistance Values (R-Values) of Low-Density Mineral-Fiber Building Insulation Batts Commercially Available in 1977, ” ORNL/TM-7266 (April 1980). |
Библиографическая ссылка |
24. Fine, H. A., Jury, S. H., McElroy, D. L., and Yarbrough, D. W., “The Thermal Conductivity of Semitransparent Materials, ” Thermal Conductivity 17, pp. 359–368, J. G. Hust (ed.), Plenum (1983). |
Библиографическая ссылка |
25. Touloukian, Y. S., Liley, P. E., and Saxena, S. C., “Thermophysical Properties of Matter-Volume 3, ” Plenum Pub. Corp., New York, p. 512 (1970) (Λ(air) = 5.4818 10<sup>-3</sup> + 6.9073 10<sup>-5</sup>T(K) in W/m K). |
Библиографическая ссылка |
26. Siu, M. C. I. and Bulik, C., “National Bureau of Standards Line-Heat-Source Guarded-Hot-Plate Apparatus, ” Rev. Sci. Instrum., 52(11) 1709–1716 (1981). |
Библиографическая ссылка |
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