纳米材料对太阳能集热器应用的影响  

Effect of Nano-Materials on Application of Solar Collector

作　　者：万峰[1] 夏清[1] 姚文杰[1] 陆地[1] 

机构地区：[1]长沙理工大学物理与电子科学学院,长沙410114

出　　处：《陶瓷》2011年第11期16-18,共3页Ceramics

基　　金：湖南省第二批大学生研究性学习和创新性试验计划项目(编号:2009-106);湖南省重点学科预备学科长沙理工大学重点学科(材料学学科)建设项目资助

摘　　要：以碳纳米管为分散相材料,乙二醇水溶液为分散介质,可制备出用于直接吸收式太阳集热器的新型吸热与传热循环工质-碳纳米管悬浮吸热黑液流体。该黑液流体的分散稳定性主要受到分散介质的组成、碳纳米管粒子的含量、分散剂的属性和含量、分散方式以及分散时间等因素的影响。分散稳定性好的碳纳米管黑液流体的对太阳辐射具有全波段强吸收特性,可以提高集热效率,加入分散剂可使光热转化效率提高12%～15%。In this paper, a concept of direct absorption type aqueous suspension containing multi--walled carbon nanotubes（ MWNTs） solar collector is proposed. Nanofluid refers to a new kind of recycle fluid for solar collectors, which collect and transport solar energy by suspending MWNTs in base fluid. The results show that some factors affect the stability and evenness of MWNTs nanofluid, such as the prot^erty of nano--particles, the property and contents of dispersants, disperse means and disperse time. The prepared MWNTs nanofluid suspensions have a good photo-- thermal stability. Because of the excellent photo--thermal properties and flow performances, MWNTs nanofluid is used as recycle fluid for direct absorption type for MWNTs which could improve the thermal efficiency greatly. Adding a dispersant allows thermal conversion efficiency of 12% to 15%. MWNTs nanofluid provides a new idea for the development of solar water heater collectors.

关 键 词：纳米材料 太阳能集热器 黑液 分散 

分 类 号：TB32[一般工业技术—材料科学与工程]