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相关概念视频

Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...

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Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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生物双尺度结构薄膜用于高效的被动辐射冷却,伴随着强大的耐用性.

Renwei Zhang1, Ningning Sun1, Zehong Zhao1

  • 1State Key Laboratory of High-performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, P. R. China. fengshile@dlut.edu.cn.

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概括

研究人员开发了耐用的生物膜,用于被动辐射冷却 (PRC),灵感来自贝. 这些膜有效地反射阳光并发射热量,即使在恶劣条件下,也能实现显著的环境下冷却.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 生物模拟学是一种生物模拟学.

背景情况:

  • 被动辐射冷却 (PRC) 是一种无能冷却方法,其灵感来源于自然生物. 为实际的中华人民共和国应用实现耐用材料仍然是一个挑战.
  • 夏威夷贝的内部表面表现出显著的温度调节特性,为先进的冷却材料提供了蓝图.

研究的目的:

  • 开发高效和耐用的生物双尺度结构 (BDSS) 薄膜,用于被动辐射冷却.
  • 模仿贝中发现的自然温度调节原理,以提高冷却性能.

主要方法:

  • 研究了夏威夷贝内表面的微/纳米结构,以了解它们的温度调节机制.
  • 通过复制双尺度结构 (大三角脊和小露台台阶) 来制造BDSS膜.
  • 描述了制造的薄膜的光学特性 (太阳反射率,中红外辐射率) 和冷却性能.

主要成果:

  • BDSS 薄膜实现了0.95 的高太阳光谱反射率和0.98.9 的中红外辐射率.
  • 在直接阳光下,显示出10.8°C的环境下冷却.
  • 这些薄膜具有出色的耐用性,包括自清洁,灵活性,机械强度,化学稳定性和抗UV.

结论:

  • 灵感来自贝贝的生物双尺度结构可以显著提高被动辐射冷却效率和耐用性.
  • 开发的BDSS膜显示了在多样化和具有挑战性的环境中进行热管理的巨大潜力.
  • 这项研究强调了仿生学在设计用于无能冷却解决方案的先进材料方面的有效性.