真空集热管中吸收涂层的半球向发射率的确定

THE DETERMINATION OF HEMISPHERICAL EMITTANCE OF ABSORPTION SURFACES IN ALL-GLASS CONCENTRIC COLLECTOR TUBES

以两同心圆管辐射换热方程为基础,采用电加热法实现了真空集热管中吸收涂层半球向发射率的测定。实验表明,它与分光光度计和太阳光照法所得结果符合良好。本文给出了Al、Al-C-F/渐变SS-C/Al、渐变Al-N/Al吸收涂层和硼硅玻璃的测试结果,并对测试精度进行了分析。

On the basis of radiation heat transfer equation for the concentric cylinders, using electrical heating. The hemispherical emittance of Al-C-F/graded/SS-C/Al and graded Al-N/Al absorption surfaces and sputtered metal Al thin film in evacuated collector tubes, as well as borosilicate glass tube have been determined. Experiments have shown that the results are in good agreement with those results measured by IR spectrophoto-meter.