Preparation and performance of sodium acetate trihydrate/formamide composite phase change material

doi:10.11949/j.issn.0438-1157.20150687

Abstract

Abstract:

Formamide (FA) as modifier, a novel sodium acetate trihydrate (SAT)/formamide (FM) composite phase change material (CPCM) was prepared by melt blending method. The influence of the formamide mass fraction (the same as below) on the phase change enthalpy and the temperature of SAT/FA mixture (matrix) was discussed. The effects of nucleating agent and thickening agent on the phase separation, the degree of supercooling and the release time of composite material were systematically investigated by melting-solidification cycle and step cooling curve. The structure and performance of novel CPCM were characterized by FTIR, XRD and DSC. The results showed that the SAT/FA eutectic mixture formed by adding 25% formamide into SAT. The SAT/FA CPCM formed by adding 2% disodium hydrogen phosphate dodecahydrate (DSP) as the nuclear agent and 2% polyvinyl alcohol (PVA) as thickening agent, had a low degree of supercooling (2.67℃), long heat release time (10170 s) and excellent cycling stability. Its phase change enthalpy and temperature were 233.9 kJ·kg^-1 and 40.88℃, respectively, indicating that it can be applied to floor radiant heating with phase change thermal storage.

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Key words: sodium acetate trihydrate/formamide composite phase change material, eutectic, phase change enthalpy, surpercooling degree, cycling stability

摘要：

以甲酰胺(FA)为改性剂,采用熔融共混法对三水醋酸钠(SAT)进行改性得到新型SAT/FA复合相变材料(CPCM)。探讨FA质量分数(下同)对SAT/FA共混物(基体)相变焓及相变温度的影响。利用熔融-固化循环及步冷曲线, 系统探讨成核剂、增稠剂对复合材料相分离、过冷度及放热性能的影响。对新型SAT/FA CPCM的结构及性能进行XRD 、FTIR及DSC表征。结果显示:添加25%的FA于SAT中可形成SAT/FA低共融体;添加2% 十二水磷酸氢二钠成核剂和2%聚乙烯醇增稠剂形成的CPCM,过冷度低(2.67℃),放热时间长(10170 s),循环稳定性好, 相变焓高达233.9 kJ·kg^-1,相变温度40.88 ℃。可应用于相变蓄热地板辐射采暖。

关键词: 三水醋酸钠/甲酰胺复合相变材料, 低共融体, 相变焓, 过冷度, 循环稳定性

CLC Number:

TQ110.1
TK02

FANG Yutang, JIN Ce, LIANG Xianghui, GAO Xuenong, ZHANG Zhengguo. Preparation and performance of sodium acetate trihydrate/formamide composite phase change material[J]. CIESC Journal, 2015, 66(12): 5142-5148.

方玉堂, 金策, 梁向晖, 高学农, 张正国. 三水醋酸钠/甲酰胺复合相变材料的制备及性能[J]. 化工学报, 2015, 66(12): 5142-5148.

References 17

[1]	Sharma A, Tyagi V V, Chen C R, Buddhi D. Review on thermal energy storage with phase change materials and applications [J]. Renewable & Sustainable Energy Reviews, 2009, 13 (2): 318-345.
[2]	Sharma R K, Ganesan P, Tyagi V V, Metselaar H S C, Sandaran S C. Developments in organic solid-liquid phase change materials and their applications in thermal energy storage [J]. Energy Conversion and Management, 2015, 95: 193-228.
[3]	Barrio M, Font J, Lopez D O, Muntasell J, Tamarit J L. Floor radiant system with heat storage by a solid-solid phase transition material [J]. Solar Energy Material and Solar Cells, 1992, 27 (2): 127-133.
[4]	Li Guojian (李国建), Zhu Neng (朱能), Feng Guohui (冯国会), Hu Yanjun (胡艳军). Experiment on the phase change heat-storage electric heating floor system [J]. Acta Energiae Solaris Sinica (太阳能学报), 2007, 28 (9): 1034-1038.
[5]	Huang K L, Feng G H, Zhang J S. Experimental and numerical study on phase change material floor in solar water heating system with a new design [J]. Solar Energy, 2014, 105: 126-138.
[6]	Zhou G B, He J. Thermal performance of a radiant floor heating system with different heat storage materials and heating pipes [J]. Applied Energy, 2015, 138: 648-660.
[7]	Karim L, Barbeon F, Gegout P, Bontemps A, Royon L. New phase change material components for thermal management of the light weight envelope of buildings [J]. Energy and Buildings, 2014, 68(B): 703-706.
[8]	Zhang Y P, Lin K P, Yang R, Di H F, Jiang Y. Preparation, thermal performance and application of shape-stabilized PCM in energy efficient buildings [J]. Energy and Buildings, 2006, 38 (10): 1262-1269.
[9]	Feng Guohui (冯国会), Cui Jie (崔洁), Huang Kailiang (黄凯良), Li Huixing (李慧星), Guo Huiyu (郭慧宇). Simulation research on heat storage and release of phase change energy storage floor heating system [J]. Journal of Shenyang Jianzhu Univ. (Natural Science) (沈阳建筑大学学报), 2012, 28 (3): 527-532.
[10]	Cabrol L, Rowley P. Towards low carbon homes-a simulation analysis of building-integrated air-source heat pump systems [J]. Energy and Buildings, 2012, 48 (2012): 127-136.
[11]	Farid M M, Kong W J. Underfloor heating with latent heat storage [J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2001, 215 (5): 601-609.
[12]	Qiu Lin (邱林), Liu Xing (刘星). Research on energy storage of building structure with phase change material [J]. Journal of Building Materials (建筑材料学报), 2009, 12 (5): 621-624.
[13]	Yamaguchi M, Sayama S, Yoneda H, et al. Heat storage-type floor heating system with heat pump driven by nighttime electric power [J]. Heat Transfer-Japanese Research, 1997, 26 (2): 122-130.
[14]	Wada T, Kimura F, Yamamoto R. Studies on salt hydrate for latent storage (Ⅲ): Pesudo-binary system, CH3CO2Na·3H2O-HCONH2 [J]. The Chemical Society of Japan, 1983, 56 (5): 1575-1576.
[15]	Guion J, Teisseire M. Nucleation of sodium acetate trihydrate in thermal heat storage cycles [J]. Solar Energy, 1991, 46 (2): 97-100.
[16]	Telkes M. Thermal energy storage in salt hydrates [J]. Solar Energy Materials, 1980, 2 (4): 381-393.
[17]	Zhang Yinping (张寅平), Su Yuehong (苏跃红), Ge Xinshi (葛新石). Predietion of the melting temperature and the fusion heat of (quasi-) euteetic PCM [J]. Journal of University of Science and Technology of China (中国科学技术大学学报), 1995, 25 (4): 474-478.