Optimisation of Metastable Supercooled Liquid Phase Change Material for Long-Term Heat Energy Accumulation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27650%2F25%3A10257729" target="_blank" >RIV/61989100:27650/25:10257729 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S259017452500193X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S259017452500193X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ecmx.2025.101061" target="_blank" >10.1016/j.ecmx.2025.101061</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Optimisation of Metastable Supercooled Liquid Phase Change Material for Long-Term Heat Energy Accumulation

Popis výsledku v původním jazyce

This research study investigates sodium acetate trihydrate as a metastable supercooled liquid phase change material for long-term heat energy storage and is an efficient evaluation of various sodium acetate trihydrate-to-water ratios and heat exchanger geometries to enhance storage efficiency. Experimental modules with spiral and toroid squiggle heat exchangers were developed to assess energy retention during liquefaction, sensible heat discharge, and latent heat discharge phases. Experimental outcomes indicate that the toroid squiggle design extends latent heat discharge duration by up to 35 min compared to the spiral exchanger, reaching a maximum of 29 min. The optimal sodium acetate trihydrate-to-water ratio was 92 %, balancing high theoretical latent heat capacity (93.6 Wh) and low theoretical to real latent heat capacity ratio with phase stability. The toroid squiggle exchanger with the mentioned accumulation substance demonstrated better heat transfer, maintaining energy output above 100 W for 11 min and above 50 W for 35 min, while the spiral design showed lower values, retaining above 100 W for only 7 min and above 50 W for 26 min. Furthermore, specific heat capacity measurements showed that sodium acetate trihydrate-to-water 92:8 ratio (SAT 92) exhibited specific heat values of 2.1 kJ/kg·K in the solid phase and 5.0 kJ/kg·K in the liquid phase, confirming its strong thermal storage potential with minimal phase instability. The conclusions have highlighted the importance of optimizing heat exchanger geometry and sodium acetate trihydrate composition for sustainable energy storage and these significant insights will contribute to improving seasonal heat accumulation technologies, particularly in synergy with renewable energy systems.

Název v anglickém jazyce

Optimisation of Metastable Supercooled Liquid Phase Change Material for Long-Term Heat Energy Accumulation

Popis výsledku anglicky

This research study investigates sodium acetate trihydrate as a metastable supercooled liquid phase change material for long-term heat energy storage and is an efficient evaluation of various sodium acetate trihydrate-to-water ratios and heat exchanger geometries to enhance storage efficiency. Experimental modules with spiral and toroid squiggle heat exchangers were developed to assess energy retention during liquefaction, sensible heat discharge, and latent heat discharge phases. Experimental outcomes indicate that the toroid squiggle design extends latent heat discharge duration by up to 35 min compared to the spiral exchanger, reaching a maximum of 29 min. The optimal sodium acetate trihydrate-to-water ratio was 92 %, balancing high theoretical latent heat capacity (93.6 Wh) and low theoretical to real latent heat capacity ratio with phase stability. The toroid squiggle exchanger with the mentioned accumulation substance demonstrated better heat transfer, maintaining energy output above 100 W for 11 min and above 50 W for 35 min, while the spiral design showed lower values, retaining above 100 W for only 7 min and above 50 W for 26 min. Furthermore, specific heat capacity measurements showed that sodium acetate trihydrate-to-water 92:8 ratio (SAT 92) exhibited specific heat values of 2.1 kJ/kg·K in the solid phase and 5.0 kJ/kg·K in the liquid phase, confirming its strong thermal storage potential with minimal phase instability. The conclusions have highlighted the importance of optimizing heat exchanger geometry and sodium acetate trihydrate composition for sustainable energy storage and these significant insights will contribute to improving seasonal heat accumulation technologies, particularly in synergy with renewable energy systems.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/TM04000021" target="_blank" >TM04000021: Dlouhodobá akumulace tepelné energie v přechlazené látce</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Energy Conversion and Management-X

ISSN

2590-1745

e-ISSN

2590-1745

Svazek periodika

2025

Číslo periodika v rámci svazku

101061

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

1-11

Kód UT WoS článku

001497016200001

EID výsledku v databázi Scopus

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