CaCl_2·6H_2O/EG复合相变材料的制备与性能研究
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摘要
为了改善六水氯化钙的蓄放热性能,以六水氯化钙为相变材料(PCM)、膨胀石墨(EG)为载体、六水氯化锶为成核剂,采用物理吸附法制备六水氯化钙/膨胀石墨复合相变材料,研究复合相变材料的热物理特性.采用步冷曲线法,研究复合相变材料的过冷度、蓄/放热性能和热循环稳定性;采用扫描电镜、差示扫描量热法、热流计导热仪,对复合相变材料的显微形貌、相变潜热、相变温度、比热容和导热系数进行测定.结果表明:在六水氯化钙中添加质量分数为10%的膨胀石墨和质量分数为2%的六水氯化锶,复合相变材料的相变潜热为151.6 J/g,导热系数提升至3.328 W/(m·K),过冷度保持在2°C以内.相变材料的导热系数及过冷度得到显著改善.
A composite phase change materials(PCM) was prepared by physical adsorption method with CaCl_2·6H_2O as PCM, expanded graphite(EG) as carrier and SrCl_2·6H_2O as nucleating agent in order to improve the heat storage-release property of CaCl_2·6H_2O. The thermophysical properties of the PCM were analyzed. The cooling curve was used to analyze the degree of supercooling, the heat storage-release property and thermal cycling stability of the composite PCM. The composite material's micromorphology, latent heat, phase transition temperature,specific heat and thermal conductivity were measured by using scanning electron microscopy, differential scanning calorimeter and thermal conductivity meter. The experimental results showed that phase change latent heat of the composite PCM was 151.6 J/g by adding 10% mass fraction of EG and 2% mass fraction of SrCl_2·6H_2O into CaCl_2·6H_2O, thermal conductivity increased to 3.328 W/(m·K), and the degree of supercooling kept within 2 °C.The thermal conductivity and supercooling of the PCM were significantly improved.
A composite phase change materials(PCM) was prepared by physical adsorption method with CaCl_2·6H_2O as PCM, expanded graphite(EG) as carrier and SrCl_2·6H_2O as nucleating agent in order to improve the heat storage-release property of CaCl_2·6H_2O. The thermophysical properties of the PCM were analyzed. The cooling curve was used to analyze the degree of supercooling, the heat storage-release property and thermal cycling stability of the composite PCM. The composite material's micromorphology, latent heat, phase transition temperature,specific heat and thermal conductivity were measured by using scanning electron microscopy, differential scanning calorimeter and thermal conductivity meter. The experimental results showed that phase change latent heat of the composite PCM was 151.6 J/g by adding 10% mass fraction of EG and 2% mass fraction of SrCl_2·6H_2O into CaCl_2·6H_2O, thermal conductivity increased to 3.328 W/(m·K), and the degree of supercooling kept within 2 °C.The thermal conductivity and supercooling of the PCM were significantly improved.
引文
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[2]CUNHA J P D,EAMES P.Thermal energy storage for low and medium temperature applications using phase change materials:a review[J].Applied Energy,2016,177:227-238.
[3]MOHAMED S A,Al-SULAIMAN F A,IBRAHIM NI,et al.A review on current status and challenges of inorganic phase change materials for thermal energy storage systems[J].Renewable and Sustainable Energy Reviews,2017,70:1072-1089.
[4]KOCA A,OZTOP H F,KOYUM T,et al.Energy and exergy analysis of a latent heat storage system with phase change material for a solar collector[J].Renewable Energy,2008,33(4):567-574.
[5]VAROL Y,KOCA A,OZTOP H F,et al.Forecasting of thermal energy storage performance of phase change material in a solar collector using soft computing techniques[J].Expert Systems with Applications,2010,37(4):2724-2732.
[6]韩宗伟,王一茹,阿不来提·依米提,等.太阳能热泵相变蓄热供暖系统参数影响研究[J].太阳能学报,2015,36(8):2028-2035.HAN Zong-wei,WANG Yi-ru,ABLAT-Yimit,et al.Parameter study of solar assisted heat pump heating system with phase change thermal storage[J].Acta Energiae Solaris Sinica,2015,36(8):2028-2035.
[7]QU S,MA F,JI R,et al.System design and energy performance of a solar heat pump heating system with dual-tank latent heat storage[J].Energy and Buildings,2015,105:294-301.
[8]ZHOU G,PANG M.Experimental investigations on thermal performance of phase change material:Trombe wall system enhanced by delta winglet vortex generators[J].Energy,2015,93:758-769.
[9]TYAGI V V,PANDEY A K,BUDDHI D,et al.Thermal performance assessment of encapsulated PCM based thermal management system to reduce peak energy demand in buildings[J].Energy and Buildings,2016,117:44-52.
[10]徐云龙,刘栋.六水氯化钙相变材料过冷性质的研究[J].材料工程,2006(增1):218-221.XU Yun-long,LIU Dong.Preliminary supercooling research on calcium chloride hexahydrate as phase change material[J].Journal of Materials Engineering,2006(Suppl.1):218-221.
[11]刘栋,徐云龙.成核剂对CaCl2·6H2O相变材料储热性能的影响[J].太阳能学报,2007,28(7):732-738.LIU Dong,XU Yun-long.Thermoproperties research on uncleators-CaCl2·6H2O composites under distinctive systems[J].Acta Energiae Solaris Sinica,2007,28(7):732-738.
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[13]LI G,ZHANG B,LI X,et al.The preparation,characterization and modification of a new phase change material:CaCl2·6H2O-MgCl2·6H2O eutectic hydrate salt[J].Solar Energy Materials and Solar Cells,2014,126(1):51-55.
[14]SHAHBAZ K,ALNASHEF I M,LIN R J T,et al.Anovel calcium chloride hexahydrate-based deep eutectic solvent as a phase change materials[J].Solar Energy Materials and Solar Cells,2016,155:147-154.
[15]SARI A,KARAIPEKLI A.Thermal conductivity and latent heat thermal energy storage characteristics of paraffin/expanded graphite composite as phase change material[J].Applied Thermal Engineering,2007,27(8):1271-1277.
[16]张正国,龙娜,方晓明.石蜡/膨胀石墨复合相变储热材料的性能研究[J].功能材料,2009,40(8):1313-1315.ZHANG Zheng-guo,LONG Na,FANG Xiao-ming.Study on performance of paraffin/expanded graphite composite phase-change material[J].Journal of Functional Materials,2009,40(8):1313-1315.
[17]ZHANG Z,ZHANG N,PENG J,et al.Preparation and thermal energy storage properties of paraffin/expanded graphite composite phase change material[J].Applied Energy,2012,91(1):426-431.
[18]胡小冬,高学农,李得伦,等.石蜡/膨胀石墨定形相变材料的性能[J].化工学报,2013,64(10):3831-3837.HU Xiao-dong,GAO Xue-nong,LI De-lun,et al.Performance of paraffin/expanded graphite composite phase change materials[J].CIESCJournal,2013,64(10):3831-3837.
[19]DUAN Z J,ZHANG H Z,SUN L X,et al.CaCl2·6H2O/expanded graphite composite as formstable phase change materials for thermal energy storage[J].Journal of Thermal Analysis and Calorimetry,2014,115(1):111-117.
[20]YE R,LIN W,YUAN K,et al.Experimental and numerical investigations on the thermal performance of building plane containing CaCl2·6H2O/expanded graphite composite phase change material[J].Applied Energy,2017,193:325-335.
[21]张仁元.相变材料与相变储能技术[M].北京:科学出版社,2009.
[22]熊文嘉.冷却速度及添加物对水合盐过冷度的影响研究[D].兰州:兰州理工大学,2014.XIONG Wen-jia.Study on the effects of cooling rate and additives on supercooling degrees of hydrated salts[D].Lanzhou:Lanzhou University of Technology,2014.
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[28]李新芳,吴淑英,朱冬生.碳纳米管/石蜡复合相变储能材料的导热性能研究[J].现代化工,2015(5):113-116.LI Xin-fang,WU Shu-ying,ZHU Dong-sheng.Thermal conductivity of CNTs/paraffin phase change composites[J].Modern Chemical Industry,2015(5):113-116.