Experimental verification of theoretically estimated composition and enthalpy of fusion of eutectic salt mixtures

Ralf Raud; Stuart Bell; Kyla Adams; Rodrigo Lima; Geoffrey Will; Theodore A. Steinberg

doi:10.1016/j.solmat.2017.09.033

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Experimental verification of theoretically estimated composition and enthalpy of fusion of eutectic salt mixtures

Journal article

Peer reviewed

Experimental verification of theoretically estimated composition and enthalpy of fusion of eutectic salt mixtures

Ralf Raud, Stuart Bell, Kyla Adams, Rodrigo Lima, Geoffrey Will and Theodore A. Steinberg

Solar Energy Materials and Solar Cells, Vol.174, pp.515-522

2018

DOI: https://doi.org/10.1016/j.solmat.2017.09.033

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Abstract

PCM

eutectic salt

latent heat of fusion estimation

eutectic salt composition estimation

The design of latent heat thermal energy storage systems is critically dependent on the properties of the chosen Phase Change Material (PCM). Currently published data on the thermodynamic properties of eutectic salts contains contradictory data, impeding the selection of PCMs. In this work, previously elaborated theoretical methods for predicting the composition and enthalpy of fusion for eutectic salt mixtures is experimentally validated for three ternary eutectic mixtures: LiNO3 + NaNO3 + KNO3, Li2CO3 + Na3CO3 + K2CO3, and NaCl + Na2CO3 + Na2SO4. For each combination of salts, the eutectic composition suggested by published sources and the composition predicted by the theory are created. The latent heat of fusion, melting temperature, and congruency of the melting peak of these six mixtures are examined via differential scanning calorimetry. In addition, scanning electron microscopy and energy dispersive spectroscopy are used to verify the expected eutectic structure. Analysis of these six mixtures confirms that the composition can be predicted to within 8%. The enthalpy of fusion can be predicted to within 10% of experimental results. In addition, three binary eutectics (NaCl + Na2SO4, KCl + K2CO3, and NaCl + Na2CO3) are created and the theoretical enthalpy of fusion is experimentally verified.

Details

Title: Experimental verification of theoretically estimated composition and enthalpy of fusion of eutectic salt mixtures
Authors: Ralf Raud (Corresponding Author) - Queensland University of Technology
Stuart Bell (Author) - Queensland University of Technology
Kyla Adams (Author) - Queensland University of Technology
Rodrigo Lima (Author) - Queensland University of Technology
Geoffrey Will (Author) - Queensland University of Technology
Theodore A. Steinberg (Author) - Queensland University of Technology
Publication details: Solar Energy Materials and Solar Cells, Vol.174, pp.515-522
Publisher: Elsevier BV, North-Holland
DOI: 10.1016/j.solmat.2017.09.033
ISSN: 1879-3398
Grant note: Australian Renewable Energy Agency (ARENA) ASTRI
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 99737878502621
Output Type: Journal article

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