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一、引言在所有太阳能的热利用系统中,最重要的部分是太阳能集热器。而集热器的核心,是具有选择光谱特性的吸收材料。因此,如何正确选取具有光谱选择特性的吸收材料,将直接影响到太阳能集热的效率。对于吸收材料的辐射率测定方法,已有分光测定法。本文将介绍一种新的测定方法,采用变化温度原理,也可称为热测定方法。利用热测定方法,对不同选择吸收材料的辐射率及其变化规律进行测定。最后,讨论由于采用热测定方法,所产生的测量误差。
I. INTRODUCTION In all solar thermal systems, the most important part is solar collectors. The core of the collector, is to choose the spectral characteristics of the absorbent material. Therefore, how to correctly select the absorbing materials with the characteristics of spectral selection will directly affect the efficiency of solar heat collection. Spectrophotometry has been used for the emissivity measurement of absorbent materials. This article will introduce a new measurement method, using the principle of varying temperature, also known as thermal determination method. Using the method of heat measurement, the emissivity and its variation of different selected absorbent materials were determined. Finally, discuss the measurement errors that result from using the thermal method.