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Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage

Jack Reynolds, NIGEL KOUNGAMPILLIL, Jonathon Elvins, Eifion Jewell Orcid Logo, Justin Searle Orcid Logo, Nicola Mumford Orcid Logo, Cameron Pleydell-Pearce, Richard Johnston Orcid Logo

Applied Thermal Engineering, Volume: 269, Issue: Part B, Start page: 126138

Swansea University Authors: Jack Reynolds, NIGEL KOUNGAMPILLIL, Jonathon Elvins, Eifion Jewell Orcid Logo, Justin Searle Orcid Logo, Nicola Mumford Orcid Logo, Cameron Pleydell-Pearce, Richard Johnston Orcid Logo

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DOI (Published version): 10.1016/j.applthermaleng.2025.126138

Abstract

The charging and discharging performance of thermochemical heat storage (TCHS) materials within practical applications will be influenced by key material and reactor properties such as thermal conductivity, ease of airflow through the material bulk and moisture exchange kinetics. This study examines...

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Published in: Applied Thermal Engineering
ISSN: 1359-4311 1873-5606
Published: Elsevier BV 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa69031
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This study examines the impact of varying the bead size of Alginate-Graphite-CaCl2 composites on the thermal and kinetic performance under static and dynamic conditions. Successful synthesis was achieved, with variations in composite composition ascribed to differential shrinkage factors during freezing. XCT studies highlighted improved packing with decreasing bead diameter although this significantly increases the differential pressure across the bed. Smaller diameters result in increased water sorption, which corresponds with higher peak temperatures and sustained temperature elevation during discharging analysis. Charging materials at temperatures between 90&#x2013;150 &#xB0;C has minimal effect on the ultimate charge profile. 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spelling 2025-03-14T15:12:51.9210894 v2 69031 2025-03-05 Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage f09408c990d8ed1441ceca3a7d463c1a Jack Reynolds Jack Reynolds true false edc2be3c0224b94d5cb7481f9903faf6 NIGEL KOUNGAMPILLIL NIGEL KOUNGAMPILLIL true false 8f619d25f6c30f8af32bc634e4775e21 Jonathon Elvins Jonathon Elvins true false 13dc152c178d51abfe0634445b0acf07 0000-0002-6894-2251 Eifion Jewell Eifion Jewell true false 0e3f2c3812f181eaed11c45554d4cdd0 0000-0003-1101-075X Justin Searle Justin Searle true false 342200b684b7af0e79db34f63749cee8 0000-0002-0999-0130 Nicola Mumford Nicola Mumford true false 564c480cb2abe761533a139c7dbaaca1 Cameron Pleydell-Pearce Cameron Pleydell-Pearce true false 23282e7acce87dd926b8a62ae410a393 0000-0003-1977-6418 Richard Johnston Richard Johnston true false 2025-03-05 The charging and discharging performance of thermochemical heat storage (TCHS) materials within practical applications will be influenced by key material and reactor properties such as thermal conductivity, ease of airflow through the material bulk and moisture exchange kinetics. This study examines the impact of varying the bead size of Alginate-Graphite-CaCl2 composites on the thermal and kinetic performance under static and dynamic conditions. Successful synthesis was achieved, with variations in composite composition ascribed to differential shrinkage factors during freezing. XCT studies highlighted improved packing with decreasing bead diameter although this significantly increases the differential pressure across the bed. Smaller diameters result in increased water sorption, which corresponds with higher peak temperatures and sustained temperature elevation during discharging analysis. Charging materials at temperatures between 90–150 °C has minimal effect on the ultimate charge profile. However, materials with large diameters display an improved charging efficiency advantage up to a charging level of 50 % but ultimately the smallest composites exhibit a slight efficiency improvement at 95 % charge. Journal Article Applied Thermal Engineering 269 Part B 126138 Elsevier BV 1359-4311 1873-5606 Thermochemical heat storage; Charging and discharging performances; Graphite-aided composite; Kinetic performance evaluation; Material characterisation; Bead size effects 15 6 2025 2025-06-15 10.1016/j.applthermaleng.2025.126138 COLLEGE NANME COLLEGE CODE Swansea University SU Library paid the OA fee (TA Institutional Deal) The authors would like to thank the Materials and Manufacturing Academy and COATED CDT (COATED M2A) in Swansea University, EPSRC SUSTAIN Future Manufacturing Hub (EP/S018107/1) and the Place Based Impact Acceleration Account The SWITCH to Net Zero Buildings UKRI/EPSRC (EP/Y024060/1). X-ray micro-computed tomography was supported by the Advanced Imaging of Materials (AIM) core facility (EPSRC Grant No. EP/M028267/1), the European Social Fund (ESF) through the European Union’s Convergence programme administered by the Welsh Government (80708), a Welsh Government Enhanced Competitiveness Infrastructure Grant (MA/KW/5554/19) through the European Union’s Convergence programme administered by the Welsh Government. 2025-03-14T15:12:51.9210894 2025-03-05T10:07:25.6769690 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Jack Reynolds 1 NIGEL KOUNGAMPILLIL 2 Jonathon Elvins 3 Eifion Jewell 0000-0002-6894-2251 4 Justin Searle 0000-0003-1101-075X 5 Nicola Mumford 0000-0002-0999-0130 6 Cameron Pleydell-Pearce 7 Richard Johnston 0000-0003-1977-6418 8 69031__33819__1705d935b44647b6b6c7ae5cb87d44ea.pdf 69031.VOR.pdf 2025-03-14T15:09:35.4171144 Output 6845296 application/pdf Version of Record true © 2025 The Author(s). This is an open access article distributed under the terms of the Creative Commons CC-BY license. true eng http://creativecommons.org/licenses/by/4.0/
title Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage
spellingShingle Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage
Jack Reynolds
NIGEL KOUNGAMPILLIL
Jonathon Elvins
Eifion Jewell
Justin Searle
Nicola Mumford
Cameron Pleydell-Pearce
Richard Johnston
title_short Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage
title_full Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage
title_fullStr Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage
title_full_unstemmed Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage
title_sort Assessing the effect of size variation in graphite and alginate matrices for thermochemical heat storage
author_id_str_mv f09408c990d8ed1441ceca3a7d463c1a
edc2be3c0224b94d5cb7481f9903faf6
8f619d25f6c30f8af32bc634e4775e21
13dc152c178d51abfe0634445b0acf07
0e3f2c3812f181eaed11c45554d4cdd0
342200b684b7af0e79db34f63749cee8
564c480cb2abe761533a139c7dbaaca1
23282e7acce87dd926b8a62ae410a393
author_id_fullname_str_mv f09408c990d8ed1441ceca3a7d463c1a_***_Jack Reynolds
edc2be3c0224b94d5cb7481f9903faf6_***_NIGEL KOUNGAMPILLIL
8f619d25f6c30f8af32bc634e4775e21_***_Jonathon Elvins
13dc152c178d51abfe0634445b0acf07_***_Eifion Jewell
0e3f2c3812f181eaed11c45554d4cdd0_***_Justin Searle
342200b684b7af0e79db34f63749cee8_***_Nicola Mumford
564c480cb2abe761533a139c7dbaaca1_***_Cameron Pleydell-Pearce
23282e7acce87dd926b8a62ae410a393_***_Richard Johnston
author Jack Reynolds
NIGEL KOUNGAMPILLIL
Jonathon Elvins
Eifion Jewell
Justin Searle
Nicola Mumford
Cameron Pleydell-Pearce
Richard Johnston
author2 Jack Reynolds
NIGEL KOUNGAMPILLIL
Jonathon Elvins
Eifion Jewell
Justin Searle
Nicola Mumford
Cameron Pleydell-Pearce
Richard Johnston
format Journal article
container_title Applied Thermal Engineering
container_volume 269
container_issue Part B
container_start_page 126138
publishDate 2025
institution Swansea University
issn 1359-4311
1873-5606
doi_str_mv 10.1016/j.applthermaleng.2025.126138
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description The charging and discharging performance of thermochemical heat storage (TCHS) materials within practical applications will be influenced by key material and reactor properties such as thermal conductivity, ease of airflow through the material bulk and moisture exchange kinetics. This study examines the impact of varying the bead size of Alginate-Graphite-CaCl2 composites on the thermal and kinetic performance under static and dynamic conditions. Successful synthesis was achieved, with variations in composite composition ascribed to differential shrinkage factors during freezing. XCT studies highlighted improved packing with decreasing bead diameter although this significantly increases the differential pressure across the bed. Smaller diameters result in increased water sorption, which corresponds with higher peak temperatures and sustained temperature elevation during discharging analysis. Charging materials at temperatures between 90–150 °C has minimal effect on the ultimate charge profile. However, materials with large diameters display an improved charging efficiency advantage up to a charging level of 50 % but ultimately the smallest composites exhibit a slight efficiency improvement at 95 % charge.
published_date 2025-06-15T08:24:09Z
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score 11.058331

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