STUDY ON RELIABILITY OF THERMAL CONDUCTIVITY OF THERMAL INSULATION USING COMPARISON OF VARIOUS MEASUREMENT METHODS
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Accession number;07A0043244
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| Title;STUDY ON RELIABILITY OF THERMAL CONDUCTIVITY OF THERMAL INSULATION USING COMPARISON OF VARIOUS MEASUREMENT METHODS |
| Author;
OMURA TAKAHIRO
(Nichias Corp., JPN)
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Journal Title;Thermophys Prop
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Journal Code:X0031A
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ISSN:0911-1743
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VOL.27th;NO.;PAGE.124-126(2006)
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| Figure&Table&Reference;FIG.6, REF.5 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Guarded hot plate method (GHP) is the most popular method for measuring thermal conductivity of thermal insulation. However, there are large differences among the thermal conductivities measured by GHP method apparatuses which are made in various institutions. Furthermore, the standard material for the measurement of thermal conductivity of thermal insulation is only glass wools, which are produced by NIST (National Institute of Standards and Technology), in a temperature range from about 7 to 67.DEG.C.. Therefore, the fact is that we have no standard material in the temperature range above 100.DEG.C.. Cope with these problems, we have tried to improve more accurate thermal conductivity of thermal insulation by comparing with results obtained using more than two measurements with different methods. In this study we investigate the practicality of the comparison method for the accurate measurement using GHP, cyclic heat and transient hot wire methods at a temperature range from 100 to 1300.DEG.C.. First, we developed the two types of measurement apparatuses; one can measure thermal conductivity by using both GHP and cyclic heat methods in the temperature range from 100 to 1300.DEG.C. (shown in Fig. 1), the other can measure using both cyclic heat and transient hot wire methods in the temperature range from 100 to 1000.DEG.C.. Next, we measured thermal conductivities of various thermal insulations using these apparatuses. Obtained thermal conductivities are shown in Fig. 2 to 5. The results obtained by using GHP, cyclic heat and transient hot wire methods agree with each other within .+-.10% deviations. Therefore, it is considered that the comparison of various measurement methods is practical for improvement of the accuracy. (author abst.) |
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