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Phase change materials (PCM) store and release a considerable amount of thermal energy during their transition thanks to their high latent heat. A large amount of energy used is in the form of thermal energy. Therefore, integrating a technology that can enhance energy efficiency in our daily life such as avoiding energy loss and providing the required energy seems necessary and still challenging. A thermal energy storage (TES) based on PCM can be integrated with renewable energy resources such as solar energy systems to store energy whenever it is available. In a more efficient and green approach, PCMs can also recover waste heat at different energy grades. For example, in the current study, the objective is to develop a PCM to be used at 150 ?C to be integrated in a compressed air energy storage system to store heat after compression during the charging phase and reuse it before the turbine during the discharging phase. Adipic acid is selected as an organic and non-hazardous PCM that stores around 250 J/g of thermal energy at 150 ?C. Most PCMs, especially organic ones, offer promising properties such as significant storage capacity, nonhazardous, and non-corrosive effect for thermal energy storage. However, the low thermal conductivity is a common disadvantage of PCMs that hinders their application. The low thermal conductivity of PCMs leads to the increase of charge and discharge times by suppressing the heat transfer to and out of the PCM. The main goal of this study is to increase or customize thermal conductivity of a PCM without reducing their storage property. To improve the thermal conductivity, boehmite nanoparticles (AlOOH) at low weight percentages (0.05, 0.1, 0.2 and 0.5 wt%) are added to melted adipic acid. To have a more uniform dispersion, the mixture is prepared under continuous stirring and non-continuous sonification. The boehmite nanoparticles are cost-effective, widely available with an uncomplicated synthesis process (that justifies it, Résumé de la communication présentée lors du congrès international tenu conjointement par Canadian Society for Mechanical Engineering (CSME) et Computational Fluid Dynamics Society of Canada (CFD Canada), à l’Université de Sherbrooke (Québec), du 28 au 31 mai 2023.

3D printing cellular structures with biobased polymers that possess high mechanical efficiency offer an attractive way for fabricating sustainable engineering materials. Herrin, two biobased polymers, polylactic acid (PLA) and polyamide-11 (PA-11) are melt-blended with and extruded as a co-continuous PLA/PA-11 filament for 3D printing. Fused deposition modelling (FDM) is used to manufacture samples which are then tested under quasi-static and impact loads, and the results demonstrate high impact toughness. Furthermore, a 200% increase in the impact toughness has been obtained by optimizing the print parameters. This indicates that optimization of 3D printing parameters is the key to additively manufacturing cost-efficient and eco-friendly parts that deliver mechanical/structural properties comparable to those made by injection molding. In addition, lightweight auxetic cellular beams are designed to reach a toughness-to-weight ratio much higher than the solid, hexagonal cellular, and rectangular cellular beam counterparts. An Ashby chart has been plotted, demonstrating impact toughness versus densities for comparing the performance of alternative polymers manufactured by FDM and injection molding. Finally, a 3D printed lightweight and tough biobased material is presented with significant potential for industrial applications., Résumé de la communication présentée lors du congrès international tenu conjointement par Canadian Society for Mechanical Engineering (CSME) et Computational Fluid Dynamics Society of Canada (CFD Canada), à l’Université de Sherbrooke (Québec), du 28 au 31 mai 2023.