Preparation and performance analysis of sodium sulfate decahydrate/expanded vermiculite film phase change composite

doi:10.19799/j.cnki.2095-4239.2022.0035

Abstract

Abstract:

The vacuum absorption and film vacuum encapsulation was utilized using the abundant pore structure of expanded vermiculite, a type of sodium sulfate decahydrate/EV film phase change composite (film phase change material). The supercooling and phase separation of film composites were analyzed by scanning electron microscopy, X-ray diffraction, and self-made temperature reference phase transition latent heat test chamber. The result shows that when 50% EV is added to sodium sulfate decahydrate, the pore loading capacity of EV reaches saturation. Also under the combined cation of EV and borax, the supercooling degree of the film phase change composite measured by step cooling curve was 0.5 ℃. However, after the film vacuum encapsulation, the sodium sulfate decahydrate is uniformly loaded inside the EV-layered structure. The latent heat of the film phase change composite with 50% EV content is more than 105 J/g, and it should be stable after three hundred phase change cycles. Also, after five hundred phase change cycles, the latent heat remains above 90 J/g, and the latent heat retention rate is 83.45%. The cyclic performance is better than atmospheric pressure encapsulating, and the film vacuum encapsulation can obtain a better loading effect of expanded vermiculite on sodium sulfate decahydrate. The film phase change composite can effectively inhibit the supercooling, and phase separation of sodium sulfate decahydrate, which has a high phase change cycle life.

Key words: sodium sulfate decahydrate, expanded vermiculite, film vacuum encapsulation, supercooling, phase separations

CLC Number:

TK 02

Yu WU, Zhijiang JI, Yongchao WANG, Shuai XIE, Jing WANG, Chao MA. Preparation and performance analysis of sodium sulfate decahydrate/expanded vermiculite film phase change composite[J]. Energy Storage Science and Technology, 2022, 11(10): 3142-3150.

Figures/Tables 13

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References 15

1	GOODMAN J. Researching climate crisis and energy transitions: Some issues for ethnography[J]. Energy Research & Social Science, 2018, 45: 340-347.
2	韩瑞端, 王沣浩, 郝吉波. 高温蓄热技术的研究现状及展望[J]. 建筑节能, 2011, 39(9): 32-38.
	HAN R D, WANG F H, HAO J B. Research progress and prospect of high temperature thermal storage[J]. Building Energy Efficiency, 2011, 39(9): 32-38.
3	杜贤武, 刘刚锋, 陈超, 等. 中低温相变储能技术研究与应用现状[J]. 武钢技术, 2017, 55(4): 57-62.
	DU X W, LIU G F, CHEN C, et al. Current status on research and application of phase change energy storage technology at low and medium temperature[J]. Wuhan Iron and Steel Corporation Technology, 2017, 55(4): 57-62.
4	HUANG X B, CHEN X, LI A, et al. Shape-stabilized phase change materials based on porous supports for thermal energy storage applications[J]. Chemical Engineering Journal, 2019, 356: 641-661.
5	黄金, 柯秀芳. 无机水合盐相变材料Na₂SO₄ ·10H₂O的研究进展[J]. 材料导报, 2008, 22(3): 63-67.
	HUANG J, KE X F. Research and development of Na₂SO₄ ·10H₂O as phase change materials[J]. Materials Review, 2008, 22(3): 63-67.
6	喻彩梅, 章学来, 华维三. 十水硫酸钠相变储能材料研究进展[J]. 储能科学与技术, 2021, 10(3): 1016-1024.
	YU C M, ZHANG X L, HUA W S. Research progress of sodium sulfate decahydrate phase changematerial[J]. Energy Storage Science and Technology, 2021, 10(3): 1016-1024.
7	李玉婷, 周永全, 葛飞, 等. 无机水合盐相变储能材料的过冷及相分离研究进展[J]. 盐湖研究, 2018, 26(1): 81-86.
	LI Y T, ZHOU Y Q, GE F, et al. Supercooling and phase separation of inorganic salt hydrates as phase change materials[J]. Journal of Salt Lake Research, 2018, 26(1): 81-86.
8	MILIÁN Y E, GUTIÉRREZ A, GRÁGEDA M, et al. A review on encapsulation techniques for inorganic phase change materials and the influence on their thermophysical properties[J]. Renewable and Sustainable Energy Reviews, 2017, 73: 983-999.
9	丁益民, 阎立诚, 薛俊慧. 水合盐储热材料的成核作用[J]. 化学物理学报, 1996(1): 83-86.
	DING Y M, YAN L C, XUE J H. Nucleation of salt-hydrates as the thermal energy storage material[J]. Chinese Journal of Chemical Physics, 1996(1): 83-86.
10	DONG X, MAO J F, GENG S B, et al. Study on performance optimization of sodium sulfate decahydrate phase change energy storage materials[J]. Journal of Thermal Analysis and Calorimetry, 2021, 143(6): 3923-3934.
11	LI C C, ZHANG B, XIE B S, et al. Tailored phase change behavior of Na₂SO₄ ·10H₂O/expanded graphite composite for thermal energy storage[J]. Energy Conversion and Management, 2020, 208: doi: 10.1016/j.enconman.2020.112586.
12	XIE N, LUO J M, LI Z P, et al. Salt hydrate/expanded vermiculite composite as a form-stable phase change material for building energy storage[J]. Solar Energy Materials and Solar Cells, 2019, 189: 33-42.
13	WANG Y, GE S X, HUANG B J, et al. A simple route to PVC encapsulated Na₂SO₄ ·10H₂O nano/micro-composite with excellent energy storage performance[J]. Materials Chemistry and Physics, 2019, 223: 723-726.
14	冷从斌, 季旭, 罗熙, 等. Na₂SO₄ ·10H₂O/EG复合相变材料的制备与性能分析[J]. 材料工程, 2017, 45(1): 58-64.
	LENG C B, JI X, LUO X, et al. Preparation and performance analysis of Na₂SO₄ ·10H₂O/EG composite phase-change materials[J]. Journal of Materials Engineering, 2017, 45(1): 58-64.
15	戴远哲, 唐波, 张振宇, 等. 多孔载体基水合盐相变材料热物性研究进展[J]. 精细化工, 2020, 37(9): 1755-1761, 1824.
	DAI Y Z, TANG B, ZHANG Z Y, et al. Research progress of thermophysical properties of porous carrier-based hydrated salts phase change materials[J]. Fine Chemicals, 2020, 37(9): 1755-1761, 1824.

编号	十水硫酸钠质量/g	EV掺量/%	硼砂掺量/%	过冷度/℃
1	50	0	0	4.7
2	50	0	3	0.8
3	50	50	0	1.6
4	50	50	3	0.5

编号	EV掺量/%	C_s/[J/(g·℃)]	C_l/[J/(g·℃)]	初次潜热 /(J/g)	渗漏情况
0^*	50	3.31	3.72	112.58	无
1^*	65	3.12	3.59	104.57	无
2^*	50	3.27	3.68	108.73	无
3^*	40	3.37	3.93	113.65	无
4^*	25	3.58	4.07	102.91	无

[1]	FENG Jinxin, LING Ziye, FANG Xiaoming, ZHANG Zhengguo. Research progress on phase-change emulsions [J]. Energy Storage Science and Technology, 2022, 11(6): 1968-1979.
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[3]	Caimei YU, Xuelai ZHANG, Weisan HUA. Research progress of sodium sulfate decahydrate phase changematerial [J]. Energy Storage Science and Technology, 2021, 10(3): 1016-1024.
[4]	Xianwei ZHU, Zhigao SUN. Preparation and properties of dodecane microemulsion ice slurry [J]. Energy Storage Science and Technology, 2021, 10(2): 506-513.
[5]	Jianjun WANG, Yuxia SHEN, Yu ZHANG, Tuodi ZHANG, Yong LI, Yi WANG. T-history method and its application in the determination of thermophysical properties of phase change materials [J]. Energy Storage Science and Technology, 2021, 10(1): 280-286.
[6]	FANG Manting, ZHANG Xuelai, JI Jun, HUA Weisan, LIU Biao, WANG Xuzhe. Progress in hydrated salt based composite phase change materials [J]. Energy Storage Science and Technology, 2019, 8(4): 709-717.
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[10]	WANG Huichun, LING Ziye, FANG Xiaoming, YUAN Kunjie, ZHANG Zhengguo. Recent progress in the use of magnesium chloride hexahydrate used as a phase change material#br# [J]. Energy Storage Science and Technology, 2017, 6(2): 204-212.
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[12]	ZHANG Xiyao, NIU Jianlei, WU Jianyong, ZHANG Shuo. Suppression of supercooling of PCM-water emulsions using nano-additives [J]. Energy Storage Science and Technology, 2014, 3(2): 133-136.