Mechanical and Thermal Characterization of Phase-Change Material and High-Density Polyethylene Functional Composites for Thermal Energy Storage

Messenger, Melissa; Troxler, Casey; Melendez, Isabel; Freeman, Tom C.; Reed, Nicholas; Rodríguez, Rafael; Boetcher, Sandra K. S.

doi:10.1115/1.4062197

Cited by 5 publications

References 81 publications

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Co‐crystallization behaviors and thermo‐physical properties of SSPCM consisting of an extra low melt viscosity HDPE and paraffin waxes

2023

Polymer Engineering & Sci

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Shape stabilized phase change materials (SSPCMs) consisting of an extra low melt viscosity high‐density polyethylene (lv‐HDPE) and paraffin waxes (PW) were fabricated using a twin screw extruder. Thermal and mechanical properties of these composites were assessed. The latent heats (ΔH) of the SSPCMs fabricated were up to 78 J g−1. Co‐crystallization between lv‐HDPE and paraffin waxes increased with increasing wax content. Dynamic mechanical thermal analysis confirmed the paraffin wax having a higher melting point (H‐PW, Tm ranging from 56 to 58°C) plasticized the lv‐HDPE, decreasing both its crystalline content and melting temperature. Static mechanical testing, disregarding the form of deformation (tension, flexural, and compression), showed addition of paraffin waxes resulted in a diminution of all mechanical properties of lv‐HDPE, but the properties of the composites with H‐PW were good in comparison to those with a lower melting point wax (L‐PW, Tm ranging from 18 to 23°C). Evidences from Cole–Cole plots obtained from oscillatory rheology experiments showed there was no interaction between lv‐HDPE and H‐PW, inducing a heterogeneous blend in contrast to the more homogeneous lv‐HDPE/L‐PW composites.

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Co‐crystallization behaviors and thermo‐physical properties of SSPCM consisting of an extra low melt viscosity HDPE and paraffin waxes

2023

Polymer Engineering & Sci

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Production and assessment of UV-cured resin coated stearyl alcohol/expanded graphite as novel shape-stable composite phase change material for thermal energy storage

Güler,

Er,

Hekimoğlu

et al. 2024

Applied Thermal Engineering

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Thermal Energy Storage Heat Exchanger Design: Overcoming Low Thermal Conductivity Limitations of Phase-Change Materials

Messenger,

Manglik,

Boetcher

2024

ASME Journal of Heat and Mass Transfer

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Recently, there has been a renewed interest in solid-to-liquid phase-change materials (PCMs) for thermal energy storage (TES) solutions in response to ambitious decarbonization goals. While PCMs have very high thermal storage capacities, their typically low thermal conductivities impose limitations on energy charging and discharging rates. Extensive research efforts have focused on improving PCM thermal conductivity through the incorporation of additives. However, this approach presents challenges such as achieving uniform mixtures, maintaining high latent heat, and cost. Alternatively, it has been demonstrated that, in this study, reducing the length scale of the PCM-encasement thickness can eliminate the low thermal conductivity effect of PCMs. To illustrate this concept, a one-dimensional PCM slab was numerically simulated. The thickness of the slab was varied to represent dimensions found in flow passages of compact heat exchangers, and the heat transfer coefficient of the heating fluid was varied to represent lower and upper bounds while also including nominal values encountered in air-to-air heat exchangers. The thermal conductivity was parametrically varied from the natural value of the PCM to simulated enhanced values (potentially achieved through additives) of up to 400 times larger. Results show that reducing the PCM encasement thickness yields substantially better performance than by improving the thermal conductivity, thereby demonstrating the potential for compact heat exchanger design to overcome the PCM thermal conductivity limitations.

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Mechanical and Thermal Characterization of Phase-Change Material and High-Density Polyethylene Functional Composites for Thermal Energy Storage

Cited by 5 publications

References 81 publications

Co‐crystallization behaviors and thermo‐physical properties of SSPCM consisting of an extra low melt viscosity HDPE and paraffin waxes

Co‐crystallization behaviors and thermo‐physical properties of SSPCM consisting of an extra low melt viscosity HDPE and paraffin waxes

Production and assessment of UV-cured resin coated stearyl alcohol/expanded graphite as novel shape-stable composite phase change material for thermal energy storage

Thermal Energy Storage Heat Exchanger Design: Overcoming Low Thermal Conductivity Limitations of Phase-Change Materials

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