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相关概念视频

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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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相关实验视频

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Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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结构性多孔陶,用于有效的白天下环境辐射冷却.

Jieyan Zhao1,2, Qing Meng1, Yong Li1

  • 1Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

ACS applied materials & interfaces
|September 26, 2023
PubMed
概括

一种新的多孔化-化陶提供被动建筑冷却. 这种材料达到显著的环境下温度和高机械强度,克服了以前基于纤维素的选项的局限性.

关键词:
燃烧合成的方法有孔的陶是多孔的陶.辐射冷却是一种辐射冷却.结构材料是结构材料.耐候性 耐候性 耐候性 耐候性

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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
  • 可持续能源 可持续能源

背景情况:

  • 被动辐射冷却提供了无能源的建筑气候控制.
  • 基于纤维素的复合材料看起来很有前途,但缺乏耐用性和耐火性.
  • 需要先进的结构材料来实现高效可靠的辐射冷却.

研究的目的:

  • 开发一种耐用,高性能的结构材料,用于被动辐射冷却.
  • 解决现有的基于纤维素的辐射冷却材料的局限性.
  • 研究化-化陶在建筑应用中的潜力.

主要方法:

  • 一步燃烧合成多孔化-化 (Si3N4-BN) 陶.
  • 光学属性的表征 (太阳反射率,大气窗口发射率).
  • 评估机械强度 (柔性和压力) 和隔热.

主要成果:

  • 实现了高太阳反射率 (~0.95) 和大气窗口辐射率 (~0.95).
  • 在直接阳光下,其已证明的环境下辐射冷却性能为5.14°C.
  • 具有出色的机械性能,屈曲强度为31.07MPa,压力强度为65.36MPa.

结论:

  • 多孔Si3N4-BN陶是被动辐射冷却的一个有前途的材料.
  • 该材料与基于纤维素的替代品相比,具有更高的耐用性和机械强度.
  • 在热带沙漠和岛屿等苛刻环境中,它显示了建筑冷却的巨大潜力.