Abstract Thermal conductivity of the Phase Change Materials (PCMs) of latent heat storage systems is enhanced by dispersing nanoparticles in base PCM for increased heat transfer rate. Heat transfer characteristics of the newly developed erythritol PCM dispersed with 1 wt% graphene nanoparticles in a newly designed shell and helical tube storage tank during charging and discharging processes was investigated. Both melting and solidification fronts progressed from the outer wall of the shell towards the axis on either side of the axis of the shell due to the helical tube arrangement. At the middle and near the axis of the storage tank, NDPCM melting time was decreased by 21% when inlet temperature of the hot therminol oil was increased from 160 °C to 180 °C and by about 30% when the oil flow rate was increased from 0.5 kg/min to 2 kg/min. Further, NDPCM solidification time was reduced by 11% when the cold therminol oil inlet temperature was decreased from 45 °C to 30 °C and by 20% when the oil flow rate was increased from 0.5 kg/min to 2 kg/min. Complete charging and discharging periods of NDPCM was reduced respectively by 20% at an inlet temperature of 180 °C and by 6% at an inlet temperature 30 °C for 1 kg/min flow rate of therminol oil compared with pure erythritol. This research study confirmed that the helical tube flow of heat transfer oil facilitated more uniform and quicker phase transition of PCM and graphene nanoparticles dispersed erythritol (NDPCM) had superior heat transfer behavior as compared to base erythritol and it can be utilized as a potential PCM for medium temperature thermal energy storage applications.

中文翻译：

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石墨烯分散赤藓糖醇PCM在壳螺旋管潜在储能系统中的热行为实验研究

摘要 潜热存储系统的相变材料 (PCM) 的热导率通过将纳米粒子分散在基础 PCM 中以提高传热速率而得到增强。研究了在充电和放电过程中在新设计的壳和螺旋管储罐中分散有 1 wt% 石墨烯纳米颗粒的新开发的赤藓糖醇 PCM 的传热特性。由于螺旋管布置，熔化和凝固前沿都从壳的外壁向壳的轴线两侧的轴线前进。在储罐中部和轴线附近，当热导热油进口温度从 160 °C 增加到 180 °C 时，NDPCM 熔化时间减少 21%，当油流量增加时，NDPCM 熔化时间减少约 30%从 0.5 kg/min 到 2 kg/min。更多，当冷热油进口温度从 45 °C 降低到 30 °C 时，NDPCM 固化时间减少 11%，当油流量从 0.5 kg/min 增加到 2 kg/min 时，NDPCM 固化时间减少 20%。与纯赤藓糖醇相比，在入口温度为 180°C 时，NDPCM 的完全充电和放电时间分别减少了 20%，在入口温度为 30°C 时，对于 1 kg/min 的therminol 油流速分别减少了 6%。这项研究证实，传热油的螺旋管流促进了 PCM 更均匀、更快速的相变，与基础赤藓糖醇相比，石墨烯纳米颗粒分散赤藓糖醇 (NDPCM) 具有更好的传热行为，可用作潜在的 PCM中温热能储存应用。