研究CH3COONa·3H2O（SAT）/Na2HPO4·12H2O（DSP）共晶盐的相变过程,分析亲水碳纳米管（HCNTs）对共晶盐热性能的优化效果。结果表明：SAT/DSP质量比为9∶1时共晶盐循环稳定性最好,且过冷度仅为2.5 ℃;随着HCNTs掺量提高,复合材料的热导率呈线性增长趋势,最高达到1.29 W/（m·K）,较未加HCNTs时提升了182.89%,蓄热密度呈线性下降趋势,最多降低了5.59%。最后对各组HCNTs/SAT/DSP复合相变材料（CPCM）进行200次固-液循环,结果表明各组材料的循环稳定性良好,具备实际应用价值。
Abstract
The phase change process of CH3COONa·3H2O （SAT）/Na2HPO4·12H2O （DSP） eutectic salt was studied experimentally, and the optimization effect of hydrophilic carbon nanotubes （HCNTs） on the thermal properties of eutectic salt was analyzed. The results show that the cyclic stability of eutectic salt is best when the mass ratio of SAT/DSP is 9∶1, and the degree of supercooling is only 2.5 ℃. As the mass fraction of the HCNTs attained is increased, the thermal conductivity of the composite shows a linear increase trend; the highest value 1.29 W/（m·K）, which is 182.89% higher than that without HCNTs. Conversely, the heat storage density manifests a downward linear trend, reaching a maximum decrease of 5.59%. Furthermore, the cyclic stability of HCNTs/SAT/DSP composites was tested, with the results revealing that after 200 solid-liquid cycles, the cyclic stability of each group of materials is good, and it has practical application value.
关键词
复合材料 /
相变 /
蓄热 /
多壁碳纳米管多壁碳纳米管 /
太阳能热水器 /
热性能
Key words
composite material /
phase change /
heat storage /
multi-walled carbon nanotubes /
solar water heater /
thermal performance
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参考文献
[1] 罗运俊, 何梓年, 王长贵. 太阳能利用技术[M]. 北京: 化学工业出版社, 2005.
LUO Y J, HE Z N, WANG C G.Solar energy utilization technology[M]. Beijing: Chemical Industry Press, 2005.
[2] SHARIF M K A, AL-ABIDI A A, MAT S, et al. Review of the application of phase change material for heating and domestic hot water systems[J]. Renewable and sustainable energy reviews, 2015, 42: 557-568.
[3] 孙峙峰, 赵耀华, 徐伟, 等. 相变蓄冷技术在公共建筑太阳能空调系统中的应用研究[J]. 太阳能学报, 2019,40(11): 3148-3155.
SUN Z F, ZHAO Y H, XU W, et al.Application study on phase-change storage of solar air conditioning system in public buildings[J]. Acta energiae solaris sinica, 2019, 40(11): 3148-3155.
[4] ALVA G,LIU L K, HUANG X, et al.Thermal energy storage materials and systems for solar energy applications[J]. Renewable & sustainable energy reviews, 2017, 68(1): 693-706.
[5] 李安桂, 史丙金, 张婉卿, 等. 基于太阳能利用的相变蓄热水箱结构优化[J]. 太阳能学报, 2020, 41(2): 217-224.
LI A G, SHI B J, ZHANG W Q, el al. Structural optimization of phase change heat storage tank based on solar energy utilization[J]. Acta energiae solaris sinica,2020, 41(2): 217-224.
[6] KUMER N, HIRSCHEY J, LACLAIR T J, et al.Review of stability and thermal conductivity enhancements for salt hydrates[J]. Journal of energy storage, 2019, 24(C): 100794.
[7] BEAUPERE N,SOUPREMANIEN U,ZALEWSKI L.Nucleation triggering methods in supercooled phase change materials (PCM): a review[J]. Thermochimica acta, 2018, 670: 184-201.
[8] 苑坤杰, 张正国, 方晓明, 等. 水合无机盐及其复合相变储热材料的研究进展[J]. 化工进展, 2016, 35(6): 1820-1826.
FAN K J, ZHANG Z G, FANG X M, et al.Research progress of inorganic hydrated salts and their phase change heat storage composites[J]. Chemical industry and engineering progess, 2016, 35(6): 1820-1826.
[9] 靳浩. 三水乙酸钠和十二水磷酸氢二钠蓄热材料的复合优化和应用[D]. 西安: 西北大学, 2020.
JIN H.Preparation end nucleation stability analysis of modified sodium acetate trihydrate[D]. Xi’an: Northwestern University, 2020.
[10] 罗凯, 叶伟梁, 王艳, 等. 太阳能生活热水系统相变储能研究进展[J]. 太阳能学报, 2022, 43(5): 220-229.
LUO K,YE W L,WANG Y,et al.Research progress of phase change energy storage in solar domestic hot water system[J]. Acta energiae solaris sinica, 2022, 43(5): 220-229.
[11] LIN Y X, JIA Y T, ALVA G, et al.Review on thermal conductivity enhancement,thermal properties and applications of phase change materials in thermal energy storage[J]. Renewable and sustainable energy reviews,2018, 82: 2730-2742.
[12] AL-AHMED A, SARI A, MAZNMUDER M A J, et al. Thermal energy storage and thermal conductivity properties of Octadecanol-MWCNT composite PCMs as promising organic heat storage materials[J]. Scientific reports, 2020, 10(1): 1-15.
[13] 卢竼漪, 侯峰, 徐贵钰. 碳纳米管-无机盐复合成核剂对MgCl2·6H2O-CaCl2·6H2O体系储热性能的影响[J]. 稀有金属材料与工程, 2018, 47(S1): 277-281.
LU P Y, HOU F, XU G Y.Effect of carbon nanotube - inorganic salt composite nucleating agents on thermal properties of MgCl2·6H2O-CaCl2·6H2O system[J]. Rare metal materials and engineering, 2018, 47(S1): 277-281.
[14] ZHANG Y P, JIANG Y.A simple method,the-history method,of determining the heat of fusion, specific heat and thermal conductivity of phase-change materials[J]. Measurement science & technology, 1999, 10(3): 201-201.
[15] 张杰, 史学伟, 赵双良, 等. 水盐体系相平衡研究进展[J]. 化工学报, 2016, 67(2): 379-389.
ZHANG J, SHI X W, ZHAO S L, et al.Progress in study on phase equilibria of salt-water systems[J]. CIESC journal, 2016, 67(2): 379-389.
[16] BARRENECHE C, NAVARRO H, SERRANO S, et al.New database on phase change materials for thermal energy storage in buildings to help PCM selection[J]. Energy procedia, 2014, 57: 2408-2415.
基金
国家重点研发计划（2018YFE0111200); 湖南省教育厅项目（21B0660）; 湖南省教育厅科研项目（18B383）
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