Effect of coffee waste on the development of phase change materials
DOI:
https://doi.org/10.35208/ert.1648388Keywords:
Coffee waste, paraffin wax, PCM, pyrolysis, spent coffee grounds, thermal managementAbstract
With the growing global demand for efficient energy storage solutions, phase change materials have gained attention due to their high latent heat storage capacity. This study investigates the potential use of bio-oils derived from spent coffee grounds in thermal management applications, particularly in lithium-ion batteries. Spent coffee grounds was subjected to pyrolysis at 550°C and hydrothermal processing at 200°C to obtain bio-oils, which were then incorporated into paraffin wax to form composite PCMs. The structural and thermal properties of these materials were analyzed using FT-IR, DSC and t-history. Results indicate that adding coffee-derived bio-oils to paraffin wax reduces its latent heat moderately, with hydrothermal and pyrolysis bio-oils causing slight decreases while improving the PCM’s responsiveness during rapid thermal fluctuations. Results also indicate that adding coffee-derived bio-oils to paraffin wax reduces its melting point, with the most significant reduction observed at a 3% bio-oil ratio lowering the melting point from 62°C to 38°C in hydrothermal bio-oil PCM composites. This temperature reduction suggests an improvement in the thermal management of Li-ion batteries, helping to mitigate overheating issues and enhance battery safety and lifespan. The findings highlight the potential of waste-derived bio-oils as sustainable additives for next-generation energy storage applications.
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