Utilization of carbonized water hyacinth for effective encapsulation and thermal conductivity enhancement of phase change energy storage materials
Utilization of carbonized water hyacinth for effective encapsulation and thermal conductivity enhancement of phase change energy storage materials
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DOI：
10.1016/j.conbuildmat.2023.130841
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发表时间：
2023-02-27
影响因子：
7.4
通讯作者：
Pan, Yucheng
中科院分区：
文献类型：
--
作者：
He, Qian;Fei, Hua;Pan, Yucheng
本研究以生物质炭为载体，吸附相变材料，提高导热性能。采用冷冻干燥（或真空干燥）结合高温炭化的方法制备了6种改性水葫芦。FC 900的孔容和比表面积（SSA）最高，分别达到0.3153 cm 3/g和479.966 m2/g，比VC 900提高了32%。FC 900和VC 900在月桂酸-肉豆蔻酸-石蜡切片（LMPS）上的负载率分别为75%和65%。LMPS/FC 900的相变焓为104.36 J/g，比LMPS/VC 900高20.75%，相变温度分别为25.93 ℃和26.77 ℃。经过500次的储放热实验，LMPS/FC 900保持稳定的相变峰值，具有良好的热性能稳定性。值得注意的是，LMPS/FC 900的热导率为0.4168W/（mGreek anoteliaK），比LMPS的热导率高56.93%。另外，在50 ℃的恒温环境下，LMPS/FC 900的加热时间比LMPS/VC 900长11.89%，具有更优异的温度控制性能。研究表明，炭化温度900 ℃和冷冻干燥措施是水葫芦的最佳制备工艺，LMPS/FC 900具有良好的导热性能和相变储能性能。
In this work, a biochar carrier was developed to adsorb phase change materials and enhance thermal conduc-tivity. Six kinds of modified carbonized water hyacinth were prepared by freeze drying (or vacuum drying) combined with high-temperature carbonization. The pore volume and specific surface area (SSA) of FC900 are the highest, reaching 0.3153 cm3/g and 479.966 m2/g, which are 32% higher than those of VC900. The load rates of FC900 and VC900 on lauric acid-myristic acid-paraffin section (LMPS) are 75% and 65% respectively. Meanwhile, the phase transition enthalpy of LMPS/FC900 is 104.36 J/g, which is 20.75% higher than that of LMPS/VC900, and the phase transition temperatures are 25.93 and 26.77 degrees C respectively. After 500 times of heat storage and release experiments, LMPS/FC900 maintains a stable phase change peak, which has good thermal performance stability. Notably, the thermal conductivity of LMPS/FC900 is 0.4168 W/(mGreek ano teleiaK), which is 56.93% higher than that of LMPS. Otherwise, under the constant temperature environment of 50 degrees C, the heating time of LMPS/FC900 is 11.89% longer than that of LMPS/VC900, which has more excellent temperature control per-formance. This study concludes that the carbonization temperature of 900 degrees C and freeze-drying measures are the best preparation process for carbonized water hyacinth, and LMPS/FC900 has good thermal conductivity and phase change energy storage performance.