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Title:
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Thermochemical seasonal solar heat storage in salt hydrates for residential applications - Influence of the water vapor pressure on the desorption kinetics of MgSO4.7H2O
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Author(s):
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Published by:
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Publication date:
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ECN
Biomass & Energy Efficiency
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10-4-2014
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ECN report number:
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Document type:
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ECN-M--14-021
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Conference Paper
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Number of pages:
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Full text:
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7
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Download PDF
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Presented at: ISES Solar World Congress 2013, Cancun, Mexico, , 3-7 november 2013.
Abstract:
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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