Abstract Latent thermal energy storage plays an indispensable role in exhaust heat recycles in various industries which is useful for reducing energy consumption. Different phase change temperatures and high thermal conductivities of composite phase change materials were required for various domains. In the present work, Alum as phase change material and Ala as melting point modifier, a series of phase change materials with adjustable melting temperatures were prepared by physical mixing method. Moreover, EG as porous skeleton and thermal conductive enhancer, composite with high thermal conductivity was obtained with simple physical adsorption method. The XRD and SEM were applied to characterize the phase crystal and microstructure of the composite phase change material. DSC results revealed that phase change temperatures of Alum-Ala mixtures could be adjustable from 91.11 °C to 74.61 °C and thermal conductivity of the composite was improved to 10.93 W·m−1·K−1, which is 21.9 times of pristine Alum-Ala mixture. The infrared thermography and temperature-time curves were obtained to represent the heat transfer performance and the subcooling degree intuitively. The subcooling degree was decreased from 2.238 K to 1.866 K. The result of TGA indicated that the composite possessed favorable thermal stability during the operating temperature. From the result, the composite obtained in the present work is a prospective candidate for exhaust heat recycles.

中文翻译：

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新型相变温度可调复合相变材料强化传热研究

摘要 潜热蓄能在各行各业的余热回收中发挥着不可或缺的作用，有利于降低能耗。不同领域需要不同的相变温度和复合相变材料的高热导率。本工作以明矾为相变材料，丙氨酸为熔点调节剂，采用物理混合法制备了一系列熔融温度可调的相变材料。此外，EG作为多孔骨架和导热增强剂，通过简单的物理吸附方法获得了具有高导热率的复合材料。采用XRD和SEM对复合相变材料的相晶体和微观结构进行表征。DSC结果表明，Alum-Ala混合物的相变温度可在91.11°C至74.61°C范围内可调，复合材料的热导率提高到10.93 W·m-1·K-1，是原始Alum的21.9倍-阿拉混合物。获得红外热像图和温度-时间曲线，直观地表示传热性能和过冷度。过冷度从2.238 K降低到1.866 K。TGA结果表明复合材料在工作温度下具有良好的热稳定性。从结果来看，目前工作中获得的复合材料是废热回收的潜在候选者。获得红外热像图和温度-时间曲线，直观地表示传热性能和过冷度。过冷度从2.238 K降低到1.866 K。TGA结果表明复合材料在工作温度下具有良好的热稳定性。从结果来看，目前工作中获得的复合材料是废热回收的潜在候选者。获得红外热像图和温度-时间曲线，直观地表示传热性能和过冷度。过冷度从2.238 K降低到1.866 K。TGA结果表明复合材料在工作温度下具有良好的热稳定性。从结果来看，目前工作中获得的复合材料是废热回收的潜在候选者。