Complete experimental performance characterisation of 13X for domestic thermochemical energy storage applications using a novel high-pressure DSC system

DOI

10.2991/978-94-6463-455-6_17How to use a DOI?

Keywords

thermochemical energy storage; thermal energy storage; interseasonal storage; domestic space heating; molecular sieves; 13X; long duration energy storage; thermal analysis; TGA and DSC; climate change

Abstract

One problem with utilising solar renewable energy sources, for domestic space heating and domestic hot water in the UK is the mismatch between energy supply and energy demand due to the seasonal variation. One way to mitigate this phenomenon is to utilise seasonal thermochemical heat storage. 13X molecular sieves have received recent attention as a thermochemical energy storage material for domestic use due to the heat stored when dehydrated and released when rehydrated. Minimal attention has been paid to the dehydration conditions and the impact this has on the heat release from dehydrated 13X. The reported study experimentally characterised the charge and discharge enthalpy of 13X molecular sieves using a custom designed novel Differential-Scanning-Calorimeter apparatus and Thermogravimetric-Analyser for mass loss investigations. This study shows how employing different thermal analysis testing methodologies can produce different results. The impact that the grade of nitrogen employed has on the mass change of the 13X samples, and the length of time exposed to the nitrogen purge as the charged sample cools, can have a dramatic impact on the mass of the 13X sample. When using a nitrogen generator or technical grade nitrogen as the purge gas in the cooling phase after a 500 ℃ dehydration, (charging), the mass of the 13X sample increased by 13% and 17%, respectively, this could potentially impact the later adsorption potential leading to reduced hydration and energy output on discharge. The hydration enthalpy (energy output) of 13X for varying charge (60–150 ℃) and discharge (25–60 ℃) temperatures, with a discharging partial vapour pressure (pH₂O) of 0.64 kPa are also presented. This work provides reference values for the expected energy output from 13X for a range of charge and discharge temperatures, for example, showing that the energy output varies from 660–500 J/g with different discharge temperatures if the sensible heat is not utilised.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Daniel Mahon
AU  - Philip Eames
PY  - 2024
DA  - 2024/07/11
TI  - Complete experimental performance characterisation of 13X for domestic thermochemical energy storage applications using a novel high-pressure DSC system
BT  - Proceedings of the International Renewable Energy Storage and Systems Conference (IRES 2023)
PB  - Atlantis Press
SP  - 163
EP  - 172
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-455-6_17
DO  - 10.2991/978-94-6463-455-6_17
ID  - Mahon2024
ER  -