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Three–step method to determine the eutectic composition of binary and ternary mixtures

Tested on two novel eutectic phase change materials based on salt hydrates

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Abstract

A three-step method to determine the eutectic composition of a binary or ternary mixture is introduced. The method consists in creating a temperature–composition diagram, validating the predicted eutectic composition via differential scanning calorimetry and subsequent T-History measurements. To test the three-step method, we use two novel eutectic phase change materials based on \(\mathrm{Zn}(\hbox {NO}_3)_2\cdot 6\mathrm{H}_{2}{\mathrm O}\) and \(\mathrm{NH}_4\mathrm{NO}_3\)   respectively \(\mathrm{Mn}(\hbox {NO}_3)_2\cdot 6\mathrm{H}_{2}{\hbox {O}}\) and \(\mathrm{NH}_4\mathrm{NO}_3\) with equilibrium liquidus temperatures of 12.4 and 3.9 \(\,^{\circ }\mathrm {C}\) respectively with corresponding melting enthalpies of 135 J \(\mathrm{g}^{-1}\) (237 J \(\mathrm{cm}^{-3}\)) respectively 133 J \(\mathrm{g}^{-1}\) (225 J \(\mathrm{cm}^{-3}\)). We find eutectic compositions of 75/25 mass% for \(\mathrm{Zn}(\hbox {NO}_3)_2\cdot \mathrm{6H}_{2}{\mathrm{O}}\) and \(\mathrm{NH}_4\mathrm{NO}_3\) and 73/27 mass% for \(\mathrm{Mn}(\hbox {NO}_3)_2\cdot 6\mathrm{H}_{2}{\mathrm{O}}\) and \(\mathrm{NH}_4\mathrm{NO}_3\). Considering a temperature range of 15 K around the phase change, a maximum storage capacity of about 172 J \(\mathrm{g}^{-1}\) (302 J \(\mathrm{cm}^{-3}\)) respectively 162 J \(\mathrm{g}^{-1}\) (274 J \(\mathrm{cm}^{-3}\)) was determined for \(\mathrm{Zn}(\hbox {NO}_3)_2\cdot \mathrm{6H}_{2}{\mathrm{O}}\) and \(\mathrm{NH}_4\mathrm{NO}_3\) respectively \(\mathrm{Mn}(\hbox {NO}_3)_2\cdot \mathrm{6H}_{2}{\mathrm{O}}\) and \(\mathrm{NH}_4\mathrm{NO}_3\).

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Acknowledgements

This work is part of the project EnFoVerM and was supported by the German Federal Ministry of Economics and Technology under the project code 0327851D. The responsibility for the content of this publication is with the authors.

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  1. Bavarian Center for Applied Energy Research (ZAE Bayern), Walther-Meissner-Str. 6, 85748, Garching, Germany

    Henri Schmit, Christoph Rathgeber, Peter Hennemann & Stefan Hiebler

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  1. Henri Schmit
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  2. Christoph Rathgeber
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Correspondence to Henri Schmit.

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Schmit, H., Rathgeber, C., Hennemann, P. et al. Three–step method to determine the eutectic composition of binary and ternary mixtures. J Therm Anal Calorim 117, 595–602 (2014). https://doi.org/10.1007/s10973-014-3783-6

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  • DOI: https://doi.org/10.1007/s10973-014-3783-6

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