No Cover Image

Journal article 120 views 13 downloads

Cycling Stability of Calcium-Impregnated Vermiculite in Open Reactor Used as a Thermochemical Storage Material

Geraint L. Sullivan Orcid Logo, Christian Griffiths, Eifion Jewell Orcid Logo, Justin Searle Orcid Logo, Jonathon Elvins

Energies, Volume: 16, Issue: 21, Start page: 7225

Swansea University Authors: Geraint L. Sullivan Orcid Logo, Christian Griffiths, Eifion Jewell Orcid Logo, Justin Searle Orcid Logo, Jonathon Elvins

  • 65056.pdf

    PDF | Version of Record

    © 2023 by the authors. Licensee MDPI, Basel, Switzerland. Distributed under the terms of a Creative Commons Attribution 4.0 International License (CC BY 4.0).

    Download (2.62MB)

Check full text

DOI (Published version): 10.3390/en16217225

Abstract

Recent research into thermochemical storage (TCS) materials has highlighted their promising potential for seasonal building heating, through energy capture and release during dehydration and hydration cycling. A common TCS material used throughout this investigation was calcium chloride (CaCl2)-impr...

Full description

Published in: Energies
ISSN: 1996-1073
Published: MDPI AG 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa65056
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: Recent research into thermochemical storage (TCS) materials has highlighted their promising potential for seasonal building heating, through energy capture and release during dehydration and hydration cycling. A common TCS material used throughout this investigation was calcium chloride (CaCl2)-impregnated vermiculite-based salt in matrix (SIM). This material was assessed for its robustness during charging and discharging cycles to assess its behavior and in terms of energy stability and chemical stability; the results of which showed consistent volumetric energy density and maximum temperature changes over seven cycles. The calcium SIM did, however, show a decline in leachable Ca content, which was presumed to be a result of stabilization within the vermiculite, and chloride concentration showed little change over the course of the study. Real-time visualization using a high-resolution microscope of calcium SIM particles showed a salt phase change and migration of liquid salt into the valleys of the lamella. A novel cobalt chloride (CoCl2) SIM was used to visualize the hydration path across the particle, through distinct color changes depending on hydration state. The results indicated that the topography of the vermiculite played a significant role in the passive hydration modeling.
Keywords: Thermochemical storage, calcium chloride, vermiculite, stability, charge and discharge cycling
College: Faculty of Science and Engineering
Funders: This research was funded by FLEXIS project (reference 80835), and was part-funded by the European Regional Development Fund (ERDF) through the Welsh Government.
Issue: 21
Start Page: 7225