Author(s): Ahmed Sarhang Hawar

Abstract: This review provides a comprehensive summary of the latest advancements in energy conversion technologies for phase change material (PCM) integrated evacuated tube solar collectors (ETSCs). In the context of increasing global energy demands and environmental concerns, the application of PCMs in solar thermal systems has emerged as a viable option to improve thermal efficiency and achieve efficient thermal energy storage (TES). The article begins with an overview of PCMs' thermo physical properties and classifications, followed by detailed discussions of their applications in active and passive solar heating systems. Particular focus is placed on evacuated tube collectors, which outperform conventional flat plate collectors by better retention of heat and optical efficiency Integration techniques of PCM, such as annular filling, internal/external embedding, and fin-assisted heat transfer, are contrasted with each other in terms of the merits and demerits. A comparison study of the performance of five PCM candidates (Paraffin, Triacontane-Paraffin, RT65, RT70HC, and RT82) is conducted and found that RT82 and RT70HC are the best in terms of thermal efficiency in the operating temperature range of 319-329 K. In addition, literature-supported solutions such as cascaded PCM designs and thermal conductivity enhancement by using metallic fins or nanoparticles are proposed as primary solutions for heat transfer improvement and storage capacity. The paper concludes by recommending further research into hybrid PCM systems and their practical implementation in real solar energy systems. This review aims to close PCM knowledge gaps in selection, design, and application, with the ultimate objective of facilitating more efficient and sustainable solar thermal technologies.

DOI: 10.22271/27078043.2025.v6.i2a.96

Pages: 54-64 | Views: 105 | Downloads: 41

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