聚光型热管式真空集热管的分析  

EXERGY ANALYSIS OF CONCENTRATING HEAT-PIPE EVACUATED SOLAR COLLECTOR TUBE

作　　者：谷伟[1] 王军[1] 余雷[1] 金叶佳[1] 张耀明[1] 

机构地区：[1]东南大学能源与环境学院太阳能技术研究中心,南京210096

出　　处：《太阳能学报》2012年第7期1218-1225,共8页Acta Energiae Solaris Sinica

基　　金：江苏省科技项目(BZ2008115;BE2008015;BZ2009110)

摘　　要：以聚光型热管式真空集热管为研究对象,结合槽式极轴跟踪聚光器,分析太阳直射辐射能到放热段传热流体热能的热转化过程,且用能量系统的分析方法对集热管的传热过程搭建效率的数学模型,给出热效率及效率的表达式,并进行室外动态性能实验,实验结果如下:实验值归一化瞬时效率为72%～73%,实验效率为6%～11%,总损率在89%以上,其中无效损失仅占很小部分,2%～5%;提高集热管焦斑的热流密度可增大集热管的效率,且集热管的效率与流量对应存在最大值。最后将效率实验值与模拟值进行比较,实际最大效率还可提高2.49%。The thermal conversion process from the sun radiation to the heat transfer fluid of exothermic section of collector tube with polar tracking parabolic trough concentrator, and exergy efficiency mathematical model has been built by using the exergy analysis method of energy system towards the heat transfer process of collector tube, ex- pressions of thermal efficiency were exergy efficiency were given. The outdoor dynamic performance experiment re- sults are as follows： Experimental normalized instantaneous efficiency is about 72% - 73% , experimental exergy efficiency is 6% - 11%, general exergy loss rate is above 89% , and the invalid exergy loss only take a very small part, about 2% -5% ; Improving the focal spot heat flux can increase the exergy efficiency, and exergy efficiency has a maximum when the flow changes. Eventually, by comparing exergy efficiency experimental results with simu- lation results, the actual exergy efficiency can also be improved 2.49% more.

关 键 词：效率 热管式真空集热管 动态性能实验 不可逆损失 

分 类 号：TK513[动力工程及工程热物理—热能工程]