Properties of composite shape-stabilized phase change materials incorporating docosane and dodecyl alcohol with added expanded graphite

doi:10.19799/j.cnki.2095-4239.2023.0532

Abstract

Abstract:

In addressing the problems of low thermal conductivity and susceptibility to leakage in phase change materials within solar photovoltaic thermal (PV/T) systems, composite shape-stabilized phase change materials comprising docosane-dodecanol and expanded graphite were prepared and their properties were experimentally studied. Herein, docosane-dodecanol phase change materials were prepared in the ratio of 6∶4, followed by the preparation of a series of composite shape-stabilized phase change materials with different expanded graphite contents through a melt blending method. In the experiment, the microstructure was observed using field emission scanning electron microscope, and various parameters such as latent heat and thermal conductivity were measured using a heat flow differential scanning calorimeter and a thermal conductivity measuring instrument, respectively. The physical compatibility, adsorption, and cycle stability of the material were also studied. The optimum ratio of expanded graphite and docosane-dodecanol and its various properties were explored. The results show that the composite shape-stabilized phase change material exhibits optimal performance when the mass fraction of expanded graphite is 15%. At this composition, the expanded graphite is sufficient to adsorb the phase change material, resulting in a permeability of only 3.85% with no noticeable exudation. The latent heat of melting and solidification phase change is 203.8 and 196.6 kJ/kg, respectively. After 50 cooling and heating cycles, minimal changes are observed in phase transition temperature and latent heat, and the thermal conductivity remains stable with a fluctuation range of only 5.9%. Additionally, the mass loss is only 0.0495 g, which shows good cycle stability. This research provides valuable theoretical data support for the subsequent application of shaped phase change materials in solar PV/T systems.

Key words: docosane-dodecyl alcohol, expanded graphite, composite shaped phase change material, physical compatibility, adsorbability, cyclic stability

CLC Number:

TB 34

Hongbing CHEN, Yuhang LIU, Congcong WANG, Men LI, Yan ZHANG, Haoyang LU, Chunyang LI. Properties of composite shape-stabilized phase change materials incorporating docosane and dodecyl alcohol with added expanded graphite[J]. Energy Storage Science and Technology, 2024, 13(2): 396-404.

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References 25

1	李滨. 转锥式生物质闪速热解装置设计理论及仿真研究[D]. 哈尔滨: 东北林业大学, 2008.
	LI B. Design theory and simulation study on rotating cone flash prolysis device for biomass[D]. Harbin: Northeast Forestry University, 2008.
2	李文晓. 能源现状及某些重要战略对策解析[J]. 化工管理, 2021(10): 13-14.
	LI W X. Analysis of energy status and some important strategic countermeasures[J]. Chemical Enterprise Management, 2021(10): 13-14.
3	李洪言, 赵朔, 刘飞, 等. 2040年世界能源供需展望——基于«BP世界能源展望(2019年版)»[J]. 天然气与石油, 2019, 37(6): 1-8.
	LI H Y, ZHAO S, LIU F, et al. Analysis on world energy supply & demand outlook in 2040—Based on BP world energy prospect(2019 edition)[J]. Natural Gas and Oil, 2019, 37(6): 1-8.
4	田玮俊, 刘何清, 吴世先. 相变储能材料的应用述评[J]. 广东化工, 2023, 50(4): 108-109, 101.
	TIAN W J, LIU H Q, WU S X. Application review of phase change energy storage materials[J]. Guangdong Chemical Industry, 2023, 50(4): 108-109, 101.
5	路绍琰, 吴丹, 马来波, 等. 中国太阳能利用技术发展概况及趋势[J]. 科技导报, 2021, 39(19): 66-73.
	LU S Y, WU D, MA L B, et al. Development situation and trend of solar energy technology industry in China[J]. Science & Technology Review, 2021, 39(19): 66-73.
6	肖瑶, 钮文泽, 魏高升, 等. 太阳能光伏/光热技术研究现状与发展趋势综述[J]. 发电技术, 2022, 43(3): 392-404.
	XIAO Y, NIU W Z, WEI G S, et al. Review on research status and developing tendency of solar photovoltaic/thermal technology[J]. Power Generation Technology, 2022, 43(3): 392-404.
7	李拴魁, 林原, 潘锋. 热能存储及转化技术进展与展望[J]. 储能科学与技术, 2022, 11(5): 1551-1562.
	LI S K, LIN Y, PAN F. Research progress in thermal energy storage and conversion technology[J]. Energy Storage Science and Technology, 2022, 11(5): 1551-1562.
8	李英峰, 张涛, 张衡, 等. 太阳能光伏光热高效综合利用技术[J]. 发电技术, 2022, 43(3): 373-391.
	LI Y F, ZHANG T, ZHANG H, et al. Efficient and comprehensive photovoltaic/photothermal utilization technologies for solar energy[J]. Power Generation Technology, 2022, 43(3): 373-391.
9	FU Z G, LIANG X T, LI Y, et al. Performance improvement of a PVT system using a multilayer structural heat exchanger with PCMs[J]. Renewable Energy, 2021, 169: 308-317.
10	SERALE G, CASCONE Y, CAPOZZOLI A, et al. Potentialities of a low temperature solar heating system based on slurry phase change materials (PCS)[J]. Energy Procedia, 2014, 62: 355-363.
11	张焕芝. 复合相变储能材料的自组装合成及性能研究[D]. 北京: 北京化工大学, 2010.
	ZHANG H Z. Fabrication and performance of composite phase change material through self-assembly technology[D]. Beijing: Beijing University of Chemical Technology, 2010.
12	汪意, 杨睿, 张寅平, 等. 定形相变材料的研究进展[J]. 储能科学与技术, 2013, 2(4): 362-368.
	WANG Y, YANG R, ZHANG Y P, et al. Recent progress in shape-stabilized phase change materials[J]. Energy Storage Science and Technology, 2013, 2(4): 362-368.
13	王宇, 李琳, 马静. 石墨基定形相变材料研究进展[J]. 化工新型材料, 2021, 49(11): 229-232.
	WANG Y, LI L, MA J. Review on graphite matrix shape-stabilized phase change material[J]. New Chemical Materials, 2021, 49(11): 229-232.
14	黄港, 邱玮, 黄伟颖, 等. 相变储能材料的研究与发展[J]. 材料科学与工艺, 2022, 30(3): 80-96.
	HUANG G, QIU W, HUANG W Y, et al. Research and development of phase change energy storage materials[J]. Materials Science and Technology, 2022, 30(3): 80-96.
15	杜文清, 费华, 顾庆军, 等. 膨胀石墨基定形复合相变材料的特性及其应用研究进展[J]. 化工新型材料, 2021, 49(11): 31-35, 40.
	DU W Q, FEI H, GU Q J, et al. Research progress on property and application of expansion graphite based fixed-shape composite phase change material[J]. New Chemical Materials, 2021, 49(11): 31-35, 40.
16	CHENG W L, ZHANG R M, XIE K, et al. Heat conduction enhanced shape-stabilized paraffin/HDPE composite PCMs by graphite addition: Preparation and thermal properties[J]. Solar Energy Materials and Solar Cells, 2010, 94(10): 1636-1642.
17	AN Z J, PEA H J M, DU X Z, et al. Preparation and characteristics optimization of octadecanoic acid/octadecanol/expanded graphite based composite phase change materials for energy storage[J]. Journal of Energy Storage, 2022, 55: 105598.
18	尹少武, 李鸿坤, 王立, 等. 80^#石蜡/膨胀石墨定形复合相变材料的特性表征与分析[J]. 化工进展, 2019, 38(3): 1494-1500.
	YIN S W, LI H K, WANG L, et al. Characteristics and analysis of 80^# paraffin/expanded graphite composite phase change material[J]. Chemical Industry and Engineering Progress, 2019, 38(3): 1494-1500.
19	张伟丽, 杜焦丽, 唐婷, 等. 十八烷/膨胀石墨定形相变材料的制备与性能[J]. 功能材料, 2023, 54(4): 4225-4229, 4236.
	ZHANG W L, DU J L, TANG T, et al. Preparation and properties of octadecane/expanded graphite forming phase change materials[J]. Journal of Functional Materials, 2023, 54(4): 4225-4229, 4236.
20	马烽, 王晓燕, 程立媛. 癸酸-月桂酸/膨胀石墨相变储能材料的制备及性能研究[J]. 功能材料, 2010, 41(S1): 180-183.
	MA F, WANG X Y, CHENG L Y. Study on preparation and properties of capric acid-lauric acid/expanded graphite phase change materials[J]. Journal of Functional Materials, 2010, 41(S1): 180-183.
21	张万鑫, 孙志高. TDA-HDA/膨胀石墨复合相变材料的制备及性能研究[J]. 功能材料, 2023, 54(3): 3106-3112.
	ZHANG W X, SUN Z G. Preparation and properties of TDA-HDA/expanded graphite composite phase change materials[J]. Journal of Functional Materials, 2023, 54(3): 3106-3112.
22	次恩达, 王会, 李晓卿, 等. 六水硝酸镁-硝酸锂共晶盐/膨胀石墨复合相变材料的制备及性能强化[J]. 储能科学与技术, 2022, 11(1): 30-37.
	CI E D, WANG H, LI X Q, et al. Preparation and property enhancement of magnesium nitrate hexahydrate-lithium nitrate eutectic/expanded graphite composite phase change materials[J]. Energy Storage Science and Technology, 2022, 11(1): 30-37.
23	王淑萍, 徐涛, 高学农, 等. 膨胀石墨基复合相变储能材料的研究进展[J]. 储能科学与技术, 2014, 3(3): 210-215.
	WANG S P, XU T, GAO X N, et al. Recent progress about expanded graphite matrix composite phase change material for energy storage[J]. Energy Storage Science and Technology, 2014, 3(3): 210-215.
24	刘晓, 孙志高, 李娟, 等. 肉豆蔻酸-十四醇/二氧化硅复合相变材料的制备及性能研究[J]. 功能材料, 2018, 49(10): 10145-10149, 10154.
	LIU X, SUN Z G, LI J, et al. Preparation and properties of MA-TD/SiO₂ composite phase change materials[J]. Journal of Functional Materials, 2018, 49(10): 10145-10149, 10154.
25	朱旭. 高密度聚乙烯基相变储能材料的性能研究[D]. 沈阳: 沈阳建筑大学, 2014.
	ZHU X. Study on the performance of phase change energy storage material based HDPE[D]. Shenyang: Shenyang Jianzhu University, 2014.

材料	材料参数	生产公司
二十二烷(DE)	相变温度25 ℃左右	上海麦克林生化科技股份有限公司
十二醇(CP)	相变温度45 ℃左右	上海麦克林生化科技股份有限公司
膨胀石墨(EG)	含碳量99%，粒度80目	河南六工石墨有限公司

仪器	型号	生产公司	参数
电热恒温干燥箱	202-0B	绍兴市尚诚仪器制造有限责任公司
磁力搅拌器	90-2	常州市金坛大地自动化仪器厂
电子分析天平	LQ-A 3003	瑞安市乐祺贸易有限公司	最大120 g e=0.001 g 最小0.01g d=0.0001 g
热流型差式扫描量热仪	DSC-200PC	德国耐驰科学仪器商贸有限公司	温度范围-150～600℃，热量范围± 2500 µV (± 700 mW)，灵敏度3 µV/mW，升温速率0.1～99.9 K/min，冷却方式为液氮+空气压缩冷却
一体式智能马弗炉	SX2-4-10A	上虞市道墟科析仪器厂
场发射扫描电子显微镜	SU8020	日本日立高新技术公司
热导率测量仪	TC-3000	西安夏溪电子科技有限公司	测量范围为0.005~20 W/(m·K)，准确度为±3%，分辨率为0.001 W/(m·K)，通常测试时间为2~20 s，配套的测试软件为Hotwire 3.0

EG的质量分数	处理前的质量/g	处理后的质量/g	DE-CP的渗漏率/%
5%	0.206	0.086	58.25
10%	0.21	0.171	18.57
13%	0.209	0.192	8.13
15%	0.208	0.2	3.85
20%	0.202	0.199	1.49

渗出情况	渗出直径百分比/%	稳定性
渗出极少(视为不渗出)	Φ≤10	非常稳定
微量渗出	10<Φ≤15	稳定
少量渗出	15<Φ≤30	基本稳定
中量渗出	30<Φ≤50	不稳定
大量渗出	Φ>50	非常不稳定

EG的质量分数	样品直径d₁/cm	渗出圈直径d₂/cm	渗出直径百分比/%	稳定性
5%	1.5	7.75	416.67	非常不稳定
10%	1.9	5	163.16	非常不稳定
13%	2.3	2.4	4.35	非常稳定
15%	2.2	2.25	2.27	非常稳定
20%	2.2	0	0.00	非常稳定