冰浆作为一种高效相变储冷介质,在储能领域具有广泛应用。针对冰浆相变过程中含冰率较低、冰晶分布不均匀等问题,提出采用丙三醇(GLY)与聚乙二醇包覆的Fe₃O₄纳米磁粒子复合体系改善冰浆的相变储冷性能。结果表明:纳米磁粒子/醇复合添加剂可显著降低系统成核功,从而降低过冷度且强化相变过程的传热特性。醇的添加使复合体系接触角降低至2°以下。此外,纳米磁粒子/醇复合添加体系的含冰率相较于同浓度醇溶液提升了近3倍,其冰晶的平均粒径随醇浓度的增加呈下降趋势。表明纳米磁粒子/醇复合添加剂可以有效降低冰晶粒径,提高含冰率,从而增强冰浆储冷能力。

As an efficient phase-change cold storage medium,ice slurry has wide applications in the field of energy storage.To address the issues of low ice content and uneven ice crystal distribution during the phase-change process of ice slurry,this study proposed to use a composite system of glycerol (GLY) and polyethylene glycol-coated ferric oxide nanomagnetic particles to improve the phase-change cold storage performance of ice slurry.The results showed that the nanomagnetic particle/alcohol composite additive could significantly reduce the nucleation work of the system,thereby lowering the degree of supercooling,and enhancing the heat transfer characteristics during phase-change process.The addition of alcohol reduced the contact angle of the composite system to below 2°.In addition,the ice content of the composite medium was nearly three times higher than that of the alcohol solution at the same concentration,and their average ice crystal size showed a decreasing trend with increasing alcohol concentration.This indicated that the nanomagnetic particle/alcohol composite additive could effectively reduce the ice crystal size,improve the ice content,thereby enhancing the cold storage capacity of ice slurry.