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Field measurement of albedo for different land cover materials and effects on thermal performance

机译:不同地面覆盖材料的反照率的现场测量及其对热性能的影响

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摘要

Albedo (or solar reflectivity) plays an important role in the thermal behavior of pavements and other ground surfaces, and their resultant impacts on humans and the environment This study developed a new albedo measurement system with a dual-pyranometer and automatic data acquisition system, and used it to conduct field measurements of albedo on different pavement materials and for long-term monitoring of albedo. The albedo values were obtained for commonly used land cover materials including asphalt, concrete and interlocking concrete paver surfacing materials with different designs and some other materials. These new data can help reduce the uncertainty in understanding, evaluating and modeling the thermal behavior and environmental impacts of ground surfaces with different albedos. The seasonal effects of albedo on pavement thermal performance were examined through experimental measurements. An empirical relationship between the cooling effect of increased albedo on a pavement's high temperature and solar radiation was developed. The cooling effect has a positive correlation with the peak solar radiation intensity. This simple correlation can be used to roughly estimate the cooling or heating effect of changing albedo on pavement for various climates and seasons with different solar radiation intensities.
机译:反照率(或太阳反射率)在人行道和其他地面的热行为及其对人和环境的影响中起着重要作用。这项研究开发了一种新的反照率测量系统,该系统具有双硬度计和自动数据采集系统,并且用它在不同的路面材料上进行反照率的现场测量,并长期监测反照率。获得了常用的土地覆盖材料的反照率值,这些材料包括具有不同设计的沥青,混凝土和联锁混凝土摊铺机铺面材料以及其他一些材料。这些新数据可以帮助减少在理解,评估和建模具有不同反射率的地表的热行为和环境影响方面的不确定性。通过实验测量来检验反照率对路面热性能的季节性影响。建立了反照率增加对路面高温的冷却效果与太阳辐射之间的经验关系。冷却效果与峰值太阳辐射强度成正相关。这种简单的相关性可用于粗略估计在不同气候和季节,不同太阳辐射强度的情况下,改变反射率对人行道的冷却或加热效果。

著录项

  • 来源
    《Building and Environment》 |2013年第1期|536-546|共11页
  • 作者

    H. Li; J. Harvey; A. Kendall;

  • 作者单位

    University of California Pavement Research Center, Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA;

    University of California Pavement Research Center, Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA;

    Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heat island; thermal environment; cool materials and cool pavements; reflectivity and albedo; cooling effect;

    机译:热岛热环境;凉爽的材料和凉爽的人行道;反射率和反照率;冷却效果;

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