Abstract
The assessment of the thermal performance of super insulating materials (SIM), characterized by thermal conductivities down to 0.002 W/(m K), is strongly influenced by even small absolute measurement uncertainties. Moreover, current standard measurement devices are constructed mostly for the so-called conventional insulation materials with values down to 0.015 W/(m K) and subsequently higher thicknesses of the investigated panels compared to SIM. For these reasons, this paper describes methods to determine the standard-based measurement uncertainty for the determination of thermal conductivity of SIM. A sensitivity study shows that temperature difference and thickness determination are the most influential parameters. Therefore, it is recommendable to use adequate temperature differences above 15 K and to take special care about the method for the determination of the panel thickness that may depend also on the flatness and torsion of the investigated panel.
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References
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Acknowledgements
This work was developed in the framework of the IEA-EBC Annex 65—Subtask 2 [1]. The authors are very grateful to all the partners involved in the project.
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Cucchi, C., Lorenzati, A., Treml, S., Sprengard, C., Perino, M. (2020). Standard-Based Analysis of Measurement Uncertainty for the Determination of Thermal Conductivity of Super Insulating Materials. In: Littlewood, J., Howlett, R., Capozzoli, A., Jain, L. (eds) Sustainability in Energy and Buildings. Smart Innovation, Systems and Technologies, vol 163. Springer, Singapore. https://doi.org/10.1007/978-981-32-9868-2_15
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DOI: https://doi.org/10.1007/978-981-32-9868-2_15
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