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ECN publication
Thermochemical seasonal solar heat storage in salt hydrates for residential applications - Influence of the water vapor pressure on the desorption kinetics of MgSO4.7H2O
Ferchaud, C.J.; Scherpenborg, R.A.A.; Zondag, H.A.; Boer, R. de
Published by: Publication date:
ECN Biomass & Energy Efficiency 10-4-2014
ECN report number: Document type:
ECN-M--14-021 Conference Paper
Number of pages: Full text:
7 Download PDF  

Presented at: ISES Solar World Congress 2013, Cancun, Mexico, , 3-7 november 2013.

An interesting thermochemical material for compact seasonal heat storage is magnesium sulfate heptahydrate MgSO4•7H2O. Previous studies in the field showed that this material presents a storage energy density of 1 GJ/m3 when the material is built in a TC storage system with a 50% porosity packed bed reactor. However, the material has slow reaction kinetics under the low vapor pressure typically occurring in a seasonal heat storage (13 mbar). The kinetic study presented in this paper shows that a higher water vapor pressure of 50 mbar increases the reaction kinetics of the dehydration process of MgSO4•7H2O, improving the performance of the material.

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