Preparation and thermophysical property analysis of nanocomposite phase change materials for energy storage
Preparation and thermophysical property analysis of nanocomposite phase change materials for energy storage
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DOI：
10.1016/j.rser.2021.111541
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发表时间：
2021-11
影响因子：
15.9
通讯作者：
Jin Wang;Yanxin Li;Dan Zheng;H. Mikulčić;M. Vujanovic;B. Sundén
中科院分区：
文献类型：
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作者：
Jin Wang;Yanxin Li;Dan Zheng;H. Mikulčić;M. Vujanovic;B. Sundén
以石蜡为基质，以纳米CuO、Al 2 O3和Fe 3 O 4为导热增强剂制备了相变材料。将分散剂Span 80加入到纳米复合材料中以提供稳定的PCM。通过熔融曲线、冻结曲线和红外热成像测试，测定了复合相变材料的相变潜热、粘度和导热系数。本文还分析了加热功率和风扇功率对相变材料热管冷却系统传热特性的影响。应用相变储能技术研究了蒸发器的温度特性。结果发现，在蒸发器中的温度波动是缓解填充绝热段覆盖相变材料的能量存储在冷却系统中。结果表明，与纯石蜡相比，1.2wt%CuO/石蜡复合相变材料在25 °C时的热导率提高了24.9%，70 °C时的热导率提高了20.6%。与纯石蜡相比，纳米复合相变材料的相变潜热降低了1.5%，在熔融温度为70 °C时粘度增加了10.1%。在集成冷却方案下，在2 V风扇电压下具有1.2wt%纳米CuO/石蜡复合材料的蒸发器的温度比在0 V风扇电压下不具有PCM的蒸发器的温度低22.0%。
Paraffin wax and various nanoparticles (CuO, Al2O3and Fe3O4) were used as matrix and heat conduction enhancer of phase change materials (PCMs), respectively. The dispersant Span 80 was added into the nanocomposite to provide stable PCMs. Based on analyses of melting and freezing curves and infrared thermal imaging tests, the phase change latent heat, viscosity, and thermal conductivity of the nanocomposite PCMs were measured. This article also analyzes the effects of heating power and fan power on heat transfer characteristics of the heat pipe with PCMs as the cooling system. Temperature of evaporator is investigated by applying PCMs energy storage. It is found that temperature fluctuations in the evaporator is alleviated by filling an adiabatic section covered with PCMs for energy storage in the cooling system. The results show that compared to pure paraffin wax, the thermal conductivity of 1.2 wt% CuO/paraffin composite PCMs increases by 24.9 % at 25 °C, whereas the thermal conductivity at 70 °C increases by 20.6 %. Compared to pure paraffin wax, the latent heat of the nanocomposite PCMs decreases by 1.5 %, the viscosity increases by 10.1 % at the melting temperature 70 °C. With an integrated cooling scheme, the temperature of the evaporator with 1.2 wt% nano-CuO/paraffin composites at a 2 V fan voltage is 22.0 % less than that without PCMs at a 0 V fan voltage.