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Verification of thermal conductivity measurements using guarded hot plate and heat flow meter methods

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Abstract

The guarded hot plate (GHP) and the heat flow meter (HFM) methods are two widely used techniques to measure the thermal conductivity (λ) of insulation specimens. In this study, the λ measurement of the two methods was validated using the certified reference material (CRM) IRMM-440 and an expanded polystyrene (EPS) board at temperatures from − 10 to 50 °C. The GHP apparatus was a commercially available apparatus for 300 mm × 300 mm specimens, and the HFM apparatus for 900 mm × 900 mm specimens was built in-house. The λ of the CRM measured using the GHP was within 2% of the certified λ value. Subsequently, the λ values of specimens of nominally identical EPS with 20 mm thicknesses were measured using both the GHP and the HFM methods. A comparison of the λ measurements showed that the two methods were consistent to within 3%. Finally, the λ values of EPS specimens of various thicknesses from 50 to 200 mm were measured using the HFM method. Although the specimens were nominally identical, values of λ for the specimens with thicknesses of 20−150 mm were increased by 0.09% mm−1 at − 10 °C and by 0.07% mm−1 at 10 °C.

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Acknowledgements

The authors would like to thank Hyunmin Jang (Korea Conformity Laboratories) for preparing and providing the specimen for the large-area HFM and letting us use the HFM apparatus. This work was supported by the Korea Research Institute of Standards and Science under the project “Establishment of National Physical Measurement Standards and Improvement of Calibration/Measurement Capability” (grant number 20011027).

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  1. Thermometry and Fluid Flow Metrology Group, Korea Research Institute of Standards and Science, Daejeon, 34113, Korea

    Daeho Kim, Sanghyun Lee & Inseok Yang

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  1. Daeho Kim
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  2. Sanghyun Lee
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  3. Inseok Yang
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Correspondence to Inseok Yang.

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Kim, D., Lee, S. & Yang, I. Verification of thermal conductivity measurements using guarded hot plate and heat flow meter methods. J. Korean Phys. Soc. 78, 1196–1202 (2021). https://doi.org/10.1007/s40042-021-00177-0

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  • DOI: https://doi.org/10.1007/s40042-021-00177-0

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