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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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.
Originele taal-2Engels
TitelProceedings of the 6th European Thermal Sciences Conference (Eurotherm 2012), 4–7 September 2012, Poitiers, France
Plaats van productieBristol
UitgeverijInstitute of Physics
Pagina's012069-1/10
DOI's
StatusGepubliceerd - 2012
Evenementconference; 6th European Thermal Sciences Conference (Eurotherm 2012), September 04 - 07, 2012, Poitiers, France - Poitiers, Frankrijk
Duur: 4 sep 20124 sep 2012

Publicatie series

NaamJournal of Physics: Conference Series
Volume395
ISSN van geprinte versie1742-6588

Congres

Congresconference; 6th European Thermal Sciences Conference (Eurotherm 2012), September 04 - 07, 2012, Poitiers, France
Verkorte titelEurotherm 2012
LandFrankrijk
StadPoitiers
Periode4/09/124/09/12
Ander6th European Thermal Sciences Conference (Eurotherm 2012), Poitiers, France

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