Fabrication and thermal conductivity improvement of novel composite adsorbents adding with nanoparticles
Fabrication and thermal conductivity improvement of novel composite adsorbents adding with nanoparticles
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DOI：
10.3901/cjme.2016.0810.091
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发表时间：
2016-10
影响因子：
4.2
通讯作者：
Qibai Wu;Xiaofeng Yu;Haiyan Zhang;Yiming Chen;Liying Liu;Xialin Xie;K. Tang;Yiji Lu;Yaodong W
中科院分区：
文献类型：
--
作者：
Qibai Wu;Xiaofeng Yu;Haiyan Zhang;Yiming Chen;Liying Liu;Xialin Xie;K. Tang;Yiji Lu;Yaodong W
吸附剂的导热系数是影响吸附式制冷机系统整体性能的关键参数之一。提高吸附剂的导热性能一直是化学吸附领域的研究热点之一。将碳包覆金属（铝和镍）纳米粒子以3种不同的添加量添加到氯化物盐和天然膨胀石墨的混合物中，制备了一种新型的化学复合吸附剂，旨在提高其导热性能。介绍了该新型复合吸附剂的制备工艺及其导热性能。实验结果表明，纳米粒子均匀分散在复合吸附剂通过应用报道的制备工艺。当纳米粒子的添加量为10wt%时，复合吸附剂的导热系数平均可提高20%。此外，碳包覆的铝纳米颗粒比镍纳米颗粒表现出更有效的热导率增大。对于CaCl_2-NEG复合吸附剂，Al@C纳米颗粒对吸附剂有较大的增强作用，增强幅度在30%~ 50%，而Ni@C纳米颗粒对吸附剂的增强作用最大仅为10%。该研究为设计和制备导热化学复合吸附剂提供了方法学基础。
Thermal conductivity is one of key parameters of adsorbents, which will affect the overall system performance of adsorption chiller. To improve adsorbent’s thermal conductivity is always one of research focuses in chemisorption field. A new chemical composite adsorbent is fabricated by adding carbon coated metal(Aluminum and Nickel) nanoparticles with three different addition amounts into the mixture of chloride salts and natural expanded graphite aiming to improve the thermal conductivity. The preparation processes and its thermal conductivity of this novel composite adsorbent are reported and summarized. Experimental results indicate that the nanoparticles are homogenously dispersed in the composite adsorbent by applying the reported preparation processes. The thermal conductivity of the composite adsorbent can averagely enlarge by 20% when the weight ratio of the added nanoparticles is 10 wt%. Moreover, carbon coated aluminum nanoparticles exhibit more effective enlargement in thermal conductivity than nickel nanoparticles. As for the composite adsorbent of CaCl2-NEG, there is a big reinforcement from 30% to 50% for Al@C nanoparticles, however only 10% in maximum caused by Ni@C nanoparticles. The proposed research provides a methodology to design and prepare thermal conductive chemical composite adsorbent.