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Article

Thermal Conductivity of Molten Carbonates with Dispersed Solid Oxide from Differential Scanning Calorimetry

1
Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), NO-7034 Trondheim, Norway
2
SINTEF Industry, SINTEF, NO-7034 Trondheim, Norway
3
PoreLab, Department of Chemistry, NTNU, NO-7034 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Materials 2019, 12(9), 1486; https://doi.org/10.3390/ma12091486
Received: 27 February 2019 / Revised: 13 April 2019 / Accepted: 7 May 2019 / Published: 8 May 2019
(This article belongs to the Section Energy Materials)
Recently, there has been a noticeable increase in the applications of composite mixtures containing molten salt and solid oxide for thermal energy conversion and storage systems. This highlights that thermal conductivity of the composites are central for the purpose of designing and devising processes. Measuring the thermal conductivity of molten samples at elevated temperatures remains challenging. In this study, the possibility to use heat flux differential scanning calorimetry (DSC) to measure the thermal conductivity of molten samples at elevated temperatures is reported for the first time. The thermal conductivity of composite mixtures containing eutectic (Li,Na)2CO3 with and without selected solid oxides at ~675 °C was determined by using the proposed DSC approach. This mixture is a candidate for high temperature waste heat conversion to electric energy. In the DSC measurement program, steps with repeated thermal cycles between 410 and 515 °C were included to limit the effect of the interface thermal contact resistance. The determined values 0.826 ± 0.001, and 0.077 ± 0.004 W m−1K−1 for the carbonate mixtures with and without solid MgO were found to match the reliable analysis at similar conditions. View Full-Text
Keywords: Molten salt composite; thermal conductivity; differential scanning calorimetry; laser flash analysis Molten salt composite; thermal conductivity; differential scanning calorimetry; laser flash analysis
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MDPI and ACS Style

Kandhasamy, S.; Støre, A.; Haarberg, G.M.; Kjelstrup, S.; Solheim, A. Thermal Conductivity of Molten Carbonates with Dispersed Solid Oxide from Differential Scanning Calorimetry. Materials 2019, 12, 1486. https://doi.org/10.3390/ma12091486

AMA Style

Kandhasamy S, Støre A, Haarberg GM, Kjelstrup S, Solheim A. Thermal Conductivity of Molten Carbonates with Dispersed Solid Oxide from Differential Scanning Calorimetry. Materials. 2019; 12(9):1486. https://doi.org/10.3390/ma12091486

Chicago/Turabian Style

Kandhasamy, Sathiyaraj, Anne Støre, Geir M. Haarberg, Signe Kjelstrup, and Asbjørn Solheim. 2019. "Thermal Conductivity of Molten Carbonates with Dispersed Solid Oxide from Differential Scanning Calorimetry" Materials 12, no. 9: 1486. https://doi.org/10.3390/ma12091486

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