摘要
文章以NaCl和Al-Si合金为高温相变材料,以氧化铝坩埚为封装容器,以高温陶瓷胶为密封材料,经低温固化和高温烧结制备了NaCl/Al_(2)O_(3)和Al-Si/Al_(2)O_(3)相变宏胶囊,并对样品的宏观形貌、相变特性、防泄漏性能及热循环性能进行测试与分析。结果表明,在50次熔化-凝固实验后,宏胶囊结构保持完整、蓄热性能稳定。且越接近相变温度点的温度区间,宏胶囊的潜热储热优势越明显。在熔点附近100℃温区内,相变材料为宏胶囊提供约70%的储热量。温度区间为500~900℃时,NaCl/Al_(2)O_(3)-30.0%相变宏胶囊的储热密度高达655J/g和1480J/cm^(3);同温区内,Al-Si/Al_(2)O_(3)相变宏胶囊的蓄热能力优于NaCl/Al_(2)O_(3)相变宏胶囊,其中Al-12Si/Al_(2)O_(3)-40.0%和Al-20Si/Al_(2)O_(3)-11.5%相变宏胶囊的单位体积储热密度分别为1524J/cm^(3)和1667J/cm^(3)。本研究为高温相变材料的封装提供了新的思路与参考,在高温相变储热领域具有广阔的应用前景。
This study reports the preparation of macroencapsulated phase change material(PCM)by employing NaCl and Al-Si alloys as the PCM,alumina crucibles as the encapsulating containers,and high-temperature ceramic glue as the sealing agent.The macrocapsules are prepared through two processes involving low-temperature curing and hightemperature sintering.The macroscopic morphology,phase change characteristics,leakage resistance,and thermal cycling properties of the prepared samples have been thoroughly investigated and analyzed.The results demonstrate that the macrocapsules retained their structural integrity and stable thermal energy storage performance after 50 melting-solidification cycles.The latent heat storage advantage of the macrocapsules became increasingly pronounced in the temperature range proximate to the phase change temperature.Specifically,within a 100℃interval centered on the melting point,the PCM contributed approximately 70%of the total stored heat capacity of the macrocapsules.When operated within the temperature range of 500~900℃,the NaCl/Al_(2)O_(3)-30.0%macrocapsules exhibited a remarkable thermal energy storage density of 655 J/g and 1480 J/cm^(3).Moreover,the heat storage capacity of Al-Si/Al_(2)O_(3)phase change macrocapsules is superior to that of NaCl/Al_(2)O_(3)phase change macrocapsules,with the volumetric heat storage densities of Al-12Si/Al_(2)O_(3)-40.0%and Al-20Si/Al_(2)O_(3)-11.5%phase change macrocapsules reaching 1524 J/cm^(3)and 1667 J/cm^(3)respectively.This study provides new ideas and references for the encapsulation of high-temperature phase change materials,and has broad application prospects in the field of high-temperature phase change thermal energy storage.
作者
陆莎莎
盛楠
朱春宇
LU Shasha;SHENG Nan;ZHU Chunyu(School of Low-carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《新能源科技》
2024年第5期1-9,共9页
New Energy Science and Technology
基金
国家自然科学基金资助项目(22379161)。
关键词
热能储存
相变材料
封装
储能
thermal energy storage
phase change material
encapsulation
energy storage
