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Understanding Photo-thermal and Melting Mechanisms in Optical Charging of Nano and Micro Particles Laden Organic PCMs
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Understanding Photo-thermal and Melting Mechanisms in Optical Charging of Nano and Micro Particles Laden Organic PCMs
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Paper
Understanding Photo-thermal and Melting Mechanisms in Optical Charging of Nano and Micro Particles Laden Organic PCMs
2023
Overview
The realm of latent heat storage has witnessed emergence of optical charging as a promising route of solar thermal latent heat storage. However, it is still in its initial stages of development and warrants further investigations to take it to the next level i.e., realization of optical charging based real-world systems. Engineering efficient optical charging process in turn necessitates efficient photo-thermal energy conversion, transfer as well as storage of the incident solar radiant energy. The present work is a determining step in deciphering, quantifying, and understanding the aforementioned steps involved in the optical charging process. In particular, experiments have been designed carefully to investigate optical charging of composite-PCMs (particles laden organic PCMs) with and without thermochromism assistance. Spatial-temporal temperature distribution curves reveal that temperature spread (in the liquid phase) in case of optical charging of non-thermochromic particles (carbon soot nanoparticles) laden PCMs is significantly high (as high as approximately 24 {\\deg}C) relative to that observed in case of thermochromic particles (microcapsules) laden PCMs (approximately, 4 {\\deg}C). The magnitude of the temperature spread (being representative of the deviation from thermostatic optical charging) clearly points out that opposed to non-thermochromic laden PCMs, nearly thermostatic optical charging can be achieved in case of thermochromic particles laden PCMs. Furthermore, in case of optical charging without thermochromic assistance, the temperature spread, peak temperatures and the melting rates increase with increase in particles concentration. Whereas, in the latter case, although the temperature spread and peak temperatures are nearly independent; the melting rates do depend on the particles concentration.
Publisher
Cornell University Library, arXiv.org
