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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%。
Taking the condenser tube collector as the research object and the groove polar axis tracking condenser, the thermal conversion process of the direct solar radiation to the thermal energy of the heat transfer fluid in the exothermic section was analyzed. And by using the analytical method of energy system The heat transfer process of the collector tube establishes a mathematic model of efficiency, gives the expression of thermal efficiency and efficiency, and conducts the outdoor dynamic performance test. The experimental results are as follows: The normalized instantaneous efficiency of the experimental value is 72% ~ 73% The efficiency is 6% ~ 11%, the total loss rate is over 89%, of which the ineffective, the loss accounts for only a small part of 2% ~ 5%; to improve the heat flux density of the collector tube heat collector tube can increase the efficiency, And the efficiency of the collector tube and the flow corresponding to the existence of the maximum. Finally, the experimental value of efficiency is compared with the simulation value, the actual maximum efficiency can be increased by 2.49%.