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ECN publication
Characterization of salt hydrates for compact seasonal thermochemical storage
Published by: Publication date:
ECN Efficiency & Infrastructure 26-8-2009
ECN report number: Document type:
ECN-M--09-102 Conference Paper
Number of pages: Full text:
8 Download PDF  

Presented at: Effstock 2009 - Thermal Energy Storage for Energy Efficiency and Sustainability, Stockholm, Sweden, 14-17 juni 2009.

The salt hydrates MgSO4,.7H2O, Al2SO4.18H2O, MgCl2.6H2O and CaCl2.2H2O were studied as possible thermochemical materials for seasonal heat storage of solar heat. It is possible for all four salt hydrates to be dehydrated at temperatures that can be achieved with a medium temperature collector. Based on temperature lifts observed during hydration, it was found that operating at low pressure significantly improves the vapor transport in the system in comparison to atmospheric pressure hydration. The observed temperature lift realized during chlorides (MgCl2.6H2O and CaCl2.2H2O) achieved a significant larger temperature lift than the sulfates (MgSO4,.7H2O and Al2SO4.18H2O). However, the chlorides tend to form a gel-like substance due to melting or the formation of a solution.

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