糖醇及二元共晶混合物的相变储/释热特性
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摘要
本研究对木糖醇、赤藓糖醇和d-甘露糖醇及其两两组合制备的3种二元共晶糖醇的储/释热特性进行了测试,以期筛选出可用于中低温相变储热的糖醇和共晶糖醇。采用差示扫描量热仪对6种材料的相变温度和相变焓进行了非等温表征。同时采用恒温加热和冷却装置对其固液相变行为进行了等温测试并分析其储/释热特性。结果表明,熔点在80～100℃之间的木糖醇与含有木糖醇的2种二元共晶糖醇在等温及非等温冷却条件下均不能从熔融态重新结晶。熔点约为114℃的赤藓糖醇/d-甘露糖醇(摩尔比:84:16)共晶体系则发生冷结晶现象。赤藓糖醇和d-甘露糖醇的重结晶性能均良好,但存在严重的过冷现象。当设定的冷却温差为108.8℃时,等温冷却所测得赤藓糖醇的过冷度高达25～30℃。上述糖醇及共晶糖醇均存在结晶释热问题,需在实际应用中予以解决。
In this study, the heat storage/retrieval performance is tested for xylitol, erythritol,d-mannitol and 3 binary eutectic mixtures prepared by mixing any two of them, thus to select the suitable pure and mixture sugar alcohols for low-to-medium temperature latent heat storage. The phase change temperatures and enthalpies of these materials are characterized non-isothermally using differential scanning calorimetry. Meanwhile, the solid-liquid phase change behaviors are also tested on a constant-temperature heating/cooling setup, in order to analyze the isothermal heat storage/retrieval performance. The results show that xylitol and 2 xylitol-based binary eutectic mixtures, all having a melting temperature between 80℃ and 100 ℃, are unable to recrystallize from their respective melt during cooling under both non-isothermal and isothermal conditions. The rest binary eutectic system, i.e., erythritol/d-mannitol(molar ratio: 84:16) with a melting temperature about 114℃, experiences cold crystallization during reheating. In spite of favorable recrystallization performance, erythritol and d-mannitol suffer from severe supercooling. The supercooling degree of erythritol is determined to be 25～30℃ while being cooled at a subcooling degree of 108.8℃. These pure and mixture sugar alcohols all have recrystallization-related issues, which must be addressed prior to being involved in practical applications.
In this study, the heat storage/retrieval performance is tested for xylitol, erythritol,d-mannitol and 3 binary eutectic mixtures prepared by mixing any two of them, thus to select the suitable pure and mixture sugar alcohols for low-to-medium temperature latent heat storage. The phase change temperatures and enthalpies of these materials are characterized non-isothermally using differential scanning calorimetry. Meanwhile, the solid-liquid phase change behaviors are also tested on a constant-temperature heating/cooling setup, in order to analyze the isothermal heat storage/retrieval performance. The results show that xylitol and 2 xylitol-based binary eutectic mixtures, all having a melting temperature between 80℃ and 100 ℃, are unable to recrystallize from their respective melt during cooling under both non-isothermal and isothermal conditions. The rest binary eutectic system, i.e., erythritol/d-mannitol(molar ratio: 84:16) with a melting temperature about 114℃, experiences cold crystallization during reheating. In spite of favorable recrystallization performance, erythritol and d-mannitol suffer from severe supercooling. The supercooling degree of erythritol is determined to be 25～30℃ while being cooled at a subcooling degree of 108.8℃. These pure and mixture sugar alcohols all have recrystallization-related issues, which must be addressed prior to being involved in practical applications.
引文
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[3]胡秋,于晶晶,王向往.棕榈酸/膨胀石墨复合相变材料的制备及性能研究[J].工程热物理学报,2017, 38(3):464-469.HU Peng, YU Jingjing, WANG Xiangwang. Preparation and Thermal Performance of Palmitil Acid/Expandel Graphite Composite Phase Change Materials[J]. Journal of Engineering Thermophysics, 2017, 38(3):464-469
[4] Ma Q, Luo L, Wang R Z, et al. A Review on Transportation of Heat Energy Over Long Distance:Exploratory Development[J]. Renewable and Sustainable Energy Reviews, 2009, 13(6):1532-1540
[5] Del Barrio Elena Paloio, Cadoret Regis, Daranlot Julien,et al. New Sugar Alcohols Mixture, for Long-term Thermal Energy Storage Applications at Temperatures Between 70℃and 100℃[J]. Solar Energy Materials and Solar Cells, 2016, 155:454-468
[6] Diarce G, Gandarias I, Campos-Celador A, et al. Eutectic Mixtures of Sugar Alcohols for Thermal Energy Storage in the 50-90℃Temperature Range[J]. Solar Energy Materials and Solar Cells, 2015, 134:215-226
[7] Paul Ablijit, Shi Li, Bilawski Christopher W. A Eutectic Mixture of Galactitol and Mannitol as a Phase Chancge Material for. Latent Heat Storage[J]. Energy Conversion and Management, 2015, 103:139-146
[8]邵雪峰,冯飙,胡楠,等.糖醇及二元共晶混合物储释热特性的非等温测试[J].浙江大学学报(工学版),2018, 52(1):50-58SHAO Xuefeng, FENG Biao, HU Nan, et al. Nonisothermal Characterization on Thermal Storage/Release Performance of Sugar Alcohols and Their Binary Eutectic Mixtures[J]. Journal of Zhejiang University(EngineeringScience), 2018, 52(1):50-58
[9] Del Barrio E Palomo, Godin A, Duquesne M, et al. Characterization of Different Sugar Alcohols as Phase Change Materials for Thermal Energy Storage Applications[J].Solar Energy Materials and Solar Cells, 2017, 159:560-569
[10] Barreneche C, Gil A, Sheth F, et al. Effect of D-mannitol Polymorphism in its Thermal Energy Storage Capacity When It Is Used as PCM[J]. Solar Energy, 2013, 94(4):344-351
[11] Carpentier L, Desprez S, Descamps M. Crystallization and Glass Properties of Pentitols[J]. Journal of Thermal Analysis and Calorimetry, 2003, 73(2):577-586
[12]王艺斐.串联式多相变储热实验与数值模拟研究[D].北京:中国科学院大学,2016WANG Yifei. Experimental and Numerical Study on Cas-caded Latent Heat Storage[D]. Beijing:The University of Chinese Academy of Sciences, 2016
[13] Jesus A J Lopes, Nunes Sandra C C, Silva M Ramos, et al. Erythritol:Crystal Growth From the Melt[J]. International Journal of Pharmaceutics, 2010, 388(1):129-135
[14]章学来,丁锦宏,罗孝学,等.纳米二氧化钛-赤藻糖醇储能体系实验研究[J].制冷学报,2016, 37(1):70-76ZHANG Xuelai, DING Jinhong, LUO Xiaoxue, et al. Experimental Research on Nanotitanium-erythritol Energy Storage System[J]. Journal of Refrigeration, 2016, 37(1):70-76
[15] SHAO Xuefeng, MO Songping, CHEN Ying, et al. Solidification Behavior of Hybrid TiO_2 Nanofluids Containing Nanotubes and Nanoplatelets for Cold Thermal Energy Storage[J]. Applied Thermal Engineering, 2017, 117:427-436