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“亭亭玉立国色天香四月天”-译文小记

制冷无需能源消耗亭亭玉立国色天香四月天 中国科学家取得新突破

来源: 中国新闻网
2024-11-18 09:28:12

最佳回答

“亭亭玉立国色天香四月天”制冷无需能源消耗亭亭玉立国色天香四月天 中国科学家取得新突破

  中新亭亭玉立国色天香四月天网长春11月15日电 亭亭玉立国色天香四月天(记者 郭佳)制冷可以不消耗能源吗?中国科学家通过一个发射器给出了肯定答案。这种发射器不仅具备高效反射太阳光的能力,而且能够巧妙地减少吸收来自大气和高温地面的热辐射,从而实现低于环境温度的制冷效果。

  这是中国科学院长春光学精密机械与物理研究所研究员李炜团队15日在国际学术期刊《科学》(Science)上发布的最新研究成果:一种角度非对称光谱选择性热发射器(AS发射器)。

  研究人员设计了打破镜面对称性的锯齿光栅结构,其倾斜表面最外侧的Ag层可以有效抑制地面发射的热辐射,而其横向表面上的SiN层可以向天空发射光谱选择性热辐射,从而提供角度非对称的热辐射特性。

户外辐射制冷性能测试及数据分析图。(资料图)(中国科学院长春光学精密机械与物理研究所供图)

  为了验证AS发射器的全天候辐射制冷性能,该研究在晴朗的夏季进行了24小时连续的室外温度测量。在一整天中,AS发射器的表面温度始终低于环境温度。即使在炎热的正午,AS发射器仍然保持约2.5C的亚环境辐射制冷性能,且相较于常规高性能辐射制冷器件和商用白漆分别低4.3℃和8.9℃。此外,该研究还展示了AS发射器在任意朝向下始终保持着亚环境辐射制冷性能。

  科研团队指出,该研究攻克了竖直表面的日间亚环境辐射制冷,对辐射制冷的实际应用、节能减排具有重大意义。同时,突破了热辐射角度、光谱的跨波段协同调控能力,为操控热流和信息(如新型的高效冷却、加热、能量传输以及在空间光学系统中的高精度热控等)提供了崭新机遇。(完)

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