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采用稳态量热法,研制了一台真空集热管内管外表面SS-AlN太阳吸收涂层半球发射比测量装置。集热管内置三段式加热器,采用直流电源给加热器供电,测量在恒定温度时主加热器的加热功率,计算得到该温度下吸收涂层的半球发射比。多次测量同一支SS-AlN集热管的选择性吸收涂层的80℃半球发射比εss-AlN(80℃)=0.0596±0.0004。另外,多次测量同一支Cu真空管的Cu涂层的半球发射比εCu(80℃)=0.0217±0.0002。采用该装置测量真空集热管的吸收涂层半球发射比,测量精度高。
Steady-state calorimetry was used to develop a hemispherical emissivity ratio measuring device for the SS-AlN solar absorption coating on the inner surface of a vacuum tube. Collector built-in three-stage heater, the DC power supply to the heater, measuring the main heater at a constant temperature heating power, calculated at this temperature absorption coating hemispherical emission ratio. The 80 ° C hemispherical emission ratio εss-AlN (80 ° C) = 0.0596 ± 0.0004 of the selective absorption coating of the same SS-AlN heat pipe was measured many times. In addition, the hemispherical emission ratio εCu (80 ° C) of the Cu coating of the same Cu vacuum tube was measured several times = 0.0217 ± 0.0002. The apparatus is used to measure the radiation absorption ratio of the absorption coating hemisphere of the vacuum heat collecting tube, and the measurement precision is high.