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An investigation of the effect of supercooling on the performance of erythritol as a phase change material

机译：过冷对赤藓糖醇作为相变材料性能影响的研究

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Erythritol, an organic phase change material (PCM), has been identified as a suitable phase change material (PCM) to be used in latent heat thermal energy storage (LHTES) systems for medium temperature applications. Thermal energy storage systems have the advantage of storing solar thermal energy for later use, in a move to alleviate the global energy crisis as well as to reduce the environmental impact of contemporary energy use. The quasi-isothermal behaviour of the storage/release of latent thermal energy of PCMs makes LHTES systems attractive for constant-temperature applications. However, unlike most classes of organic PCMs, erythritol suffers from supercooling which has been identified to contribute to low efficiency of the LHTES system in which it is utilized. While some studies have investigated means of overcoming/suppressing supercooling in erythritol and some other organic PCMs, no study has studied quantitatively the effect of supercooling of erythritol in terms of entropy generation in a practical thermal energy storage scenario. This study uses the temperature history of erythritol in a spherical macro-capsule, during charging and subsequent discharging cycles to quantify the effect of supercooling on the PCM. Supercooling increases entropy change in erythritol whose degree increases with the rate of heat retrieval from the PCM. To utilize erythritol in a LHTES system, high rate of heat transfer and low rate of heat retrieval will minimize entropy generation and ensure high efficiency of such system.
机译：赤藓糖醇是一种有机相变材料（PCM），已被确定为适用于中温应用的潜热热能存储（LHTES）系统中合适的相变材料（PCM）。热能存储系统的优点是可以存储太阳能以供以后使用，以减轻全球能源危机以及减少当代能源使用对环境的影响。 PCM潜在热能的存储/释放的准等温行为使LHTES系统在恒温应用中具有吸引力。但是，与大多数类型的有机PCM不同，赤藓糖醇遭受过冷，这已被证实对使用LHTES系统的效率低有贡献。虽然一些研究已经研究了克服/抑制赤藓糖醇和其他有机PCM中过冷的方法，但没有研究在实际的热能存储方案中对熵产生方面的赤藓糖醇过冷的影响进行定量研究。这项研究利用球形大胶囊中赤藓糖醇的温度历史，在充电和随后的放电周期中，量化了过冷对PCM的影响。过冷会增加赤藓糖醇的熵变，赤藓糖醇的熵度随从PCM回收热量的速率而增加。为了在LHTES系统中利用赤藓糖醇，高的热传递速率和低的热回收速率将使熵的产生最小化并确保这种系统的高效率。

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