Study of the reversible water vapour sorption process of MgSO4.7H2O and MgCl2.6H2O under the conditions of seasonal solar heat storage

C. Ferchaud, H.A. Zondag, J.B.J. Veldhuis, R. Boer, de

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Abstract

The characterization of the structural, compositional and thermodynamic properties of MgSO4.7H2O and MgCl2.6H2O has been done using in-situ X-ray Diffraction and thermal analyses (TG/DSC) under practical conditions for seasonal heat storage (Tmax=150°C, p(H2O)=13 mbar). This study showed that these two materials release heat after a dehydration/hydration cycle with energy densities of 0.38 GJ/m3 for MgSO4.7H2O and 0.71 GJ/m3 MgCl2.6H2O. The low heat release found for MgSO4.7H2O is mainly attributed to the amorphization of the material during the dehydration performed at 13 mbar which reduces its sorption capacity during the rehydration. MgCl2.6H2O presents a high energy density which makes this material interesting for seasonal heat storage in domestic applications. This material would be able to fulfil the winter heat demand of a passive house estimated at 6 GJ with a packed bed reactor of 8.5 m3. However, a seasonal heat storage system built with this material should be carefully set with a restricted temperature at 40°C for the hydration reaction to avoid the liquefaction of the material at lower temperature which limits its performances for long term storage.
Original languageEnglish
Title of host publicationProceedings of the 6th European Thermal Sciences Conference (Eurotherm 2012), 4–7 September 2012, Poitiers, France
Place of PublicationBristol
PublisherInstitute of Physics
Pages012069-1/10
DOIs
Publication statusPublished - 2012
Eventconference; 6th European Thermal Sciences Conference (Eurotherm 2012), September 04 - 07, 2012, Poitiers, France - Poitiers, France
Duration: 4 Sep 20124 Sep 2012

Publication series

NameJournal of Physics: Conference Series
Volume395
ISSN (Print)1742-6588

Conference

Conferenceconference; 6th European Thermal Sciences Conference (Eurotherm 2012), September 04 - 07, 2012, Poitiers, France
Abbreviated titleEurotherm 2012
CountryFrance
CityPoitiers
Period4/09/124/09/12
Other6th European Thermal Sciences Conference (Eurotherm 2012), Poitiers, France

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    Ferchaud, C., Zondag, H. A., Veldhuis, J. B. J., & Boer, de, R. (2012). Study of the reversible water vapour sorption process of MgSO4.7H2O and MgCl2.6H2O under the conditions of seasonal solar heat storage. In Proceedings of the 6th European Thermal Sciences Conference (Eurotherm 2012), 4–7 September 2012, Poitiers, France (pp. 012069-1/10). (Journal of Physics: Conference Series; Vol. 395). Institute of Physics. https://doi.org/10.1088/1742-6596/395/1/012069