Reaction of Calcium Chloride and Magnesium Chloride and their Mixed Salts with Ethanol for Thermal Energy Storage

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The use of thermochemical energy storage systems increasingly gains interest in order to meet the energy targets of the European renewable energy directive. In this study the suitability of calcium chloride, magnesium chloride and mixed salt ethanolates as heat storage materials for practical implementation was determined by investigating specific thermodynamic properties and estimating the materials' lifetime at various operating conditions. It was proven that the reaction of the before mentioned metal salts with ethanol depends on the applied ethanol vapour pressure. The ethanol sorption increased in the following order: MgCl 2 < CaCl 2 < 2CaCl 2∗MgCl 2. The enthalpies followed the same sequence. Over-stoichiometric ethanol uptake, in particular for CaCl 2 and 2CaCl 2∗MgCl 2 with increasing C 2H 5OH vapour pressure, was observed. However, the reaction systems CaCl 2-C 2H 5OH and 2CaCl 2∗MgCl 2 -C 2H 5OH showed the best sorption properties and cycle stability and thus have a great potential for low-grade thermal energy storage as well as cold storage due to their low reaction temperatures in comparison with salt-water-systems. In general, physically mixing of single salts from the same family with different chemical properties leads to superior thermal behaviour with higher heat storage capacities and material stabilities.

Original languageEnglish
Article number125043
JournalEnergy Procedia
Pages (from-to)161-171
Number of pages11
Publication statusPublished - 01.06.2016

Bibliographical note

The study was part of a European cooperation-project with the Research Centre for Natural Sciences HAS Budapest and funded by the Federal Ministry of Education and Research.

Publisher Copyright:
© 2016 The Authors.

    Research areas

  • Chemistry - calcium chloride, cycle stability, ethanol , magnesium chloride , mixed salts , reaction kinetics sorption; TCM; TGA; Therma, sorption, TCM , TGA, Thermal energy storage