泡沫金属因轻质、多孔、高导热的性能,常被用于强化复合相变材料传热,其低发射特性可以进一步促进在光热转换及热能存储一体化领域的应用。以泡沫铜、泡沫镍、泡沫铁和泡沫铁镍为光热转换和增强导热基体,制备泡沫金属基光热转换复合相变材料,对比研究了不同泡沫金属复合相变材料的综合性能。结果表明:在800W/m2的模拟太阳光下,泡沫铁复合相变材料的储热速率和光热转换效率显著优于其他3种泡沫金属。经1h光照后,其最高温度达74.4℃;在25~50℃的光热转换过程中光热转换效率为91.97%,可实现142.63J/g的潜热存储。因此,泡沫金属复合相变材料在能源存储领域具有较好的应用潜力。
Foam metals are widely used to enhance the heat transfer of composite phase change materials (CPCMs) due to their lightweight nature,porosity,and high thermal conductivity.Additionally,their low emissivity performance further promotes their application in integrated photothermal conversion and thermal energy storage.In this study,foam copper,foam nickel,foam iron,and foam iron-nickel were used as photothermal conversion and thermal conductivity enhancement matrices to fabricate foam metal-based photothermal conversion CPCMs.The comprehensive performance of different foam metal CPCMs was compared.The results indicated that under simulated sunlight at 800W/m2,the thermal storage rate and photothermal conversion efficiency of the iron foam-based composite phase change material were significantly higher than those of the other three foam metals.After one hour of illumination,its maximum temperature reached 74.4℃.During the photothermal conversion process from 25℃ to 50℃,the photothermal conversion efficiency was 91.97%,with a latent thermal storage of 142.63J/g.These findings demonstrate that foam metal-based CPCMs have strong potential for applications in energy storage.
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基金资助
重庆市自然科学基金项目(CSTB2022NSCQ-MSX0604)