Abstract
Thermal energy storage (TES) technology is considered to have the greatest potential to balance the demand and supply overcoming the intermittency and fluctuation nature of real-world heat sources, making a more flexible, highly efficient and reliable thermal energy system. This article provides a comprehensive state-of-the-art review of latent thermal energy storage (LTES) technology with a particular focus on medium-high temperature phase change materials for heat recovery, storage and utilisation. This review aims to identify potential methods to design and optimise LTES heat exchangers for heat recovery and storage, bridging the knowledge gap between the present studies and future technological developments. The key focuses of current work can be described as follows: (1) Insight into moderate-high temperature phase change materials and thermal conductivity enhancement methods. (2) Various configurations of latent thermal energy storage heat exchangers and relevant heat transfer enhancement techniques (3) Applications of latent thermal energy storage heat exchangers with different thermal sources, including solar energy, industrial waste heat and engine waste heat, are discussed in detail.
Highlights
Tackling climate change, providing energy security and delivering sustainable energy solutions are major challenges faced by civil society
latent thermal energy storage (LTES) has the advantages of compre hensive large energy storage density, compact in size and high technical feasibility to be used for renewable energy storage, waste heat recovery (WHR) and thermal power buffering in industrial processes
As the above-mentioned reasons, we develop this review article focusing on the applications and challenges of LTES with medium-high temperature PCMS in terms of modelling, simulation and experiments of material-level (LTES materials - Phase Change Materials), componentlevel (LTES heat exchangers) and system-level, as an important reference contributing to and promoting the research progress in thermal energy systems
Summary
Tackling climate change, providing energy security and delivering sustainable energy solutions are major challenges faced by civil society. Improved thermal energy conversion and utilisation results in reduced emissions, more sustainable economy for industrial and domestic con sumers and supports a more stable energy security position [1]. One of the key research challenges in real-world thermal energy systems is how to overcome the thermal power fluctuations enabling efficiently and effectively use the heat sources such as solar, industrial waste heat and geothermal energy [2,3]
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