Improved effective thermal conductivity of sand bed in thermal energy storage systems

Sampson Tetteh, Gabriel Juul, Mika Järvinen, Annukka Santasalo-Aarnio*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Thermal energy storage (TES) is becoming increasingly important in the modern energy landscape. As the global energy demand continues to rise and the integration of renewable energy becomes crucial, there is a growing need for sustainable and affordable ways to store energy. TES materials, such as sand, molten salts and heat transfer fluids, are a significant contributing factor to the cost-effective characteristics of TES systems. In recent advancements, sand has been viewed as a high-potential TES material for TES applications, attributed to its thermal resistance, widespread availability, safety, and affordability. However, the low thermal conductivity of sand remains a challenge for some TES applications. This study evaluates different correlations for effective thermal conductivity in a sand-based experimental study where the best correlation was adapted for a numerical simulation of the sand bed. The study further explores the use of discarded metallic chips to enhance the thermal conductivity of the sand. Our experiments assessed two integration techniques using three distinct metallic materials. It was found that the maximum heat rate could be achieved with 20 % (volumetric basis) of aluminium chips mixed in sand (1.7 times that of pure sand).

Original languageEnglish
Article number111350
Number of pages12
JournalJournal of Energy Storage
Volume86
DOIs
Publication statusPublished - 10 May 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • Circular economy
  • Cost-effective
  • Packed-bed
  • Sand
  • Thermal conductivity
  • Thermal energy storage materials

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