Abstract This paper describes the development of a novel CPC (compound parabolic collector) evacuated tube solar collector, using a medium-temperature selective coating. The medium-temperature selective coating was obtained by co-sputtering titanium and aluminum targets. The absorptance and the thermal emittance of the heat treated coating is 0.95, and 0.04 at 80℃ respectively. The collector was optimized, using a manifold of copper U-tube with anti-oxidized coating and aluminum fin. An anti-reflection layer is added on the cover glass tube, and non-flash getter are used for maintaining the vacuum of the collector tubes. Thermal test results shown that the instantaneous efficiency based on gross area ηG can reach 0.46 at the temperature of 150℃ and the normalized temperature difference Tm* is 0.13 [(m2-°C)/W]. The experimental steam system application showed that the novel CPC solar collector can produce steam from water with temperatures about 108–145 °C during sunny days. It was also shown that the thermal performance of the solar collector did not degraded significantly.

中文翻译：

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新型选择性涂层CPC太阳能真空玻璃管集热器的研制

摘要 本文描述了使用中温选择性涂层的新型 CPC（复合抛物面集热器）真空管太阳能集热器的开发。通过共溅射钛和铝靶获得中温选择性涂层。热处理后的涂层在80℃时的吸光率和热辐射率分别为0.95和0.04。收集器经过优化，使用带有抗氧化涂层和铝翅片的铜 U 型管歧管。在盖玻管上增加了一层抗反射层，并使用非闪光吸气剂来保持集热管的真空度。热试验结果表明，基于总面积ηG的瞬时效率在150℃的温度下可达0.46，归一化温差Tm*为0.13[(​​m2-°C)/W]。实验蒸汽系统应用表明，新型 CPC 太阳能集热器可以在晴天从温度约 108-145°C 的水中产生蒸汽。还表明太阳能集热器的热性能没有显着降低。