以高密度聚乙烯(HDPE)作为包覆材料，石蜡作为相变材料，膨胀石墨或鳞片石墨作为导热增强剂，通过熔融共混和热压制备了不同石蜡用量的定形相变储能材料。通过实验分析了所制定形复合储能材料的相变温度、相变潜热、热导率等性能。石蜡经过高密度聚乙烯包覆之后，相变焓值下降30％左右(石蜡含量65％(质量分数))。膨胀石墨和鳞片石墨的加入均能提高复合材料的热导率。膨胀石墨含量为10％(质量分数)时，样品的热导率与无导热增强剂样品相比较提高率为594％，而相同质量分数的鳞片石墨热导率提高率仅为83％。由此可见膨胀石墨对复合材料热导率的贡献远远大于同等质量分数下鳞片石墨的贡献。
Form-stable phase change composites were prepared by melt blending and hot-compaction of paraffin, expanded graphite (EG)or flake graphite (FG)and high density polyethylene (HDPE).In the composites,par-affin served as a latent heat storage material,EG or FG as a heat transfer promoting agent and HDPE as a ma-trix.Phase transition temperatures,latent heat values and thermal conductivity values of the composites were measured.In order to prevent the leakage of melting paraffin in the composites,the minimum weight percent for HDPE was 35%.The latent heat of the composites increased with increasing mass ratio of the paraffin in the composites.EG and FG could improve thermal conductivity of the composites significantly.When the addition of EG was in the ratio of 10wt%,thermal conductivity of the PCM was up to 2.50 W/(m·K),more than 6 times of that without any additives,which was much better than that by addition of FG.
参考文献
| [1] | 张寅平;胡汉平;孔祥东.相变贮能---理论和应用[M].合肥:中国科学技术大学出版社,1996 |
| [2] | 张东,康韡,李凯莉.复合相变材料研究进展[J].功能材料,2007(12):1936-1940. |
| [3] | 陈云深,陈凯,沈斌君,姜帆,杨睿,张寅平.交联定形相变储能材料的研制[J].复合材料学报,2006(03):67-70. |
| [4] | Inaba H;Tu P .Evaluation of thermophysical characteris-tics on shape-stabilized paraffin as a solid-liquid phase change material[J].Heat and Mass Transfer,1997,32:307-312. |
| [5] | 叶宏,葛新石.一种定形相变材料的结构和理化分析[J].太阳能学报,2000(04):417-421. |
| [6] | Hong Y.;Ge XS. .Preparation of polyethylene-paraffin compound as a form-stable solid-liquid phase change material[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2000(1):37-44. |
| [7] | 秦鹏华,杨睿,张寅平,林坤平.定形相变材料的热性能[J].清华大学学报(自然科学版),2003(06):833-835. |
| [8] | Cai YB;Hu Y;Song L;Lu HD;Chen ZY;Fan WC .Preparation and characterizations of HDPE-EVA alloy/OMT nanocomposites/paraffin compounds as a shape stabilized phase change thermal energy storage material[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2006(1/2):44-51. |
| [9] | Molefi, JA;Luyt, AS;Krupa, I .Comparison of LDPE, LLDPE and HDPE as matrices for phase change materials based on a soft Fischer-Tropsch paraffin wax[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2010(1/2):88-92. |
| [10] | Pongphat Sittisart;Mohammed M. Farid .Fire retardants for phase change materials[J].Applied energy,2011(9):3140-3145. |
| [11] | 田雁晨,罗超云,林雪春,李学隆.EPDM和HDPE包覆石蜡相变储能材料的研究[J].塑料科技,2011(08):51-54. |
| [12] | Li, JL;Xue, P;Ding, WY;Han, JM;Sun, GL .Micro-encapsulated paraffin/high-density polyethylene/wood flour composite as form-stable phase change material for thermal energy storage[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2009(10):1761-1767. |
| [13] | Zhang Zhengguo;Fang Xiaoming .Study on paraffin/ex-panded graphite composite phase change thermal energy storage material[J].Energy conversion and Management,2006,47:303-310. |
| [14] | 仲亚娟,李四中,魏兴海,高晓晴,史景利,郭全贵,刘朗.不同孔隙结构的炭材料作为石蜡相变储能材料强化传热载体[J].新型炭材料,2009(04):349-353. |
| [15] | Yajuan Zhong;Quangui Guo;Sizhong Li;Jingli Shi;ang Liu .Heat transfer enhancement of paraffin wax using graphite foam for thermal energy storage[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2010(6):1011-1014. |
| [16] | Fukai J;Kanou M;Kodama Y et al.Thermal conducti-vity enhancement of energy storage media using carbon fibers[J].Energy Conversion and Management,2000,41(14):1543-1556. |
| [17] | 魏兴海,刘朗,张金喜,史景利,郭全贵.HClO4-GIC的制备及其柔性石墨的性能[J].新型炭材料,2007(04):342-348. |
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