Print Email Facebook Twitter Characterization of microencapsulated and impregnated porous host materials based on calcium chloride for thermochemical energy storage Title Characterization of microencapsulated and impregnated porous host materials based on calcium chloride for thermochemical energy storage Author Gaeini, M. Rouws, A.L. Salari, J.W.O. Zondag, H.A. Rindt, C.C.M. Publication year 2018 Abstract Thermochemical heat storage in salt hydrates is a promising method to improve the solar fraction in the built environment. The major concern at this stage is liquefaction followed by washing out of active material and agglomeration into large chunks of salt, thus deteriorating the diffusive properties of the porous salt hydrate structure. In this work, specific attention is given to the methods to stabilize a sample salt hydrate. Attempts have been made to stabilize calcium chloride by impregnation in expanded natural graphite and vermiculite, and by microencapsulation with ethyl cellulose. The effect of these stabilization methods on the performance of the material, such as kinetics and energy density, is investigated. Characterization of the materials is carried out with combined Thermo-Gravitational Analysis (TGA) and Differential Scanning Calorimetry (DSC) methods and microscopic observation, in order to evaluate the improvements on the basis of three subjects: reaction kinetics, heat storage density and stability. Within the boundary conditions for thermochemical energy storage as presented in this work, microencapsulated calcium chloride showed high multicyclic stability, compared with pure and impregnated materials, that liquefy upon hydration under the given conditions. Microencapsulated material remains stable over multiple cycles and at the same time shows the faster kinetics, but has a lower volumetric energy storage density. Subject Nano TechnologyMAS - Materials SolutionsTS - Technical SciencesIndustrial InnovationThermochemical heat storageCalcium chloride compositesMicroencapsulation and impregnatedStabilityKinetics and energy storage densityTGA-DSC To reference this document use: http://resolver.tudelft.nl/uuid:5ae71c38-edfc-4690-9645-9afbfd00b573 DOI https://doi.org/10.1016/j.apenergy.2017.12.131 TNO identifier 784885 ISSN 0306-2619 Source Applied Energy, 212, 1165-1177 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.