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Effect of substrate depth, vegetation type, and season on green roof thermal properties

机译：基质深度，植被类型和季节对屋顶绿化热性能的影响

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摘要

It is generally accepted that green roofs can influence thermal properties of a building, but there is some disagreement on the role that substrate depth and plant species plays in this equation. A study was conducted over a second floor roof in East Lansing, MI, comparing prevegetated mats of a mixture of sedum (depth = 5 cm) to a deeper roof (depth = 20 cm) planted with a mixture of 17 herbaceous perennials and grasses. Both roof sections were instrumented with heat flux sensors, thermocouples, moisture sensors, and infrared sensors, and ambient weather conditions were also continuously recorded by a weather station located on the roof. Data were collected for the period of almost a year to cover all four seasons. Also, the roofs were well established and had reached near 100% plant coverage by the time data collection commenced two years after planting. Most of the differences in temperatures and heat flux through the roof occurred during the summer or winter. During summer, the shallow sedum roof experienced more extreme fluctuations in diurnal substrate temperatures which tended to be warmer during the day, but cooler at night. Heat penetrating into the building on the sedum portion of the roof was consistently greater than the herbaceous section during the afternoon. However, during the night and early morning, heat gain into the building was greater on the herbaceous roof, especially on cloudy and rainy days. During winter, heat transfer through the sedum portion of the roof was affected more by outside environmental conditions, whereas the herbaceous portion of the roof was stable. Although, the sedum roof exhibited more extremes, when daily heat flux values were totaled for each month and each season, the herbaceous roof actually experienced more heat entering the building during the summer, but less heat escaping the building during the winter. This is an advantage during the winter months as the herbaceous roof would reduce heating costs. However, contrary to conventional logic that plants with high transpiration rates are superior, during the summer months the sedum roof outperformed the herbaceous roof. (C) 2017 Elsevier B.V. All rights reserved.
机译：人们普遍认为，绿色屋顶会影响建筑物的热性能，但是对于底物深度和植物种类在该方程式中的作用存在一些分歧。在密西根州东兰辛的二层屋顶上进行了一项研究，比较了景天混合物（景深= 5厘米）与景天混合物（较深的屋顶）（深度= 20厘米），后者种植了17种草本多年生植物和草的混合物。两个屋顶部分都装有热通量传感器，热电偶，湿度传感器和红外线传感器，并且屋顶上的气象站也连续记录了周围的天气情况。收集了将近四个季节的将近一年的数据。而且，屋顶已经完好，并且在种植后两年开始收集数据时已经达到了接近100％的植物覆盖率。穿过屋顶的温度和热通量的大部分差异发生在夏季或冬季。在夏季，浅景天屋顶的昼夜底物温度波动更大，白天趋于温暖，而夜间则趋冷。午后进入屋顶的景天部分的建筑物的热量一直大于草本部分。但是，在夜晚和清晨，草屋顶的热量进入建筑物的热量增加，尤其是在阴天和雨天。在冬季，通过屋顶的景天部分的传热受外界环境条件的影响更大，而屋顶的草本部分则稳定。尽管景天屋顶表现出更多的极端情况，但当每个月和每个季节的每日热通量值总计时，实际上，草本屋顶在夏季进入建筑物的热量更多，而在冬季则较少散逸到建筑物的热量。在冬季，这是一个优势，因为草本屋顶可以减少供暖成本。但是，与蒸腾速率高的植物优越的传统逻辑相反，在夏季月份，景天的屋顶表现优于草本屋顶。 （C）2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Energy and Buildings》 |2017年第6期|174-187|共14页
  • 作者

    Eksi Mert; Rowe D. Bradley; Wichman Indrek S.; Andresen Jeff A.;

  • 作者单位

    Michigan State Univ, Dept Hort, A212 Plant & Soil Sci, E Lansing, MI 48824 USA|Istanbul Univ, Landscape Architecture Dept, Fac Forestry, Istanbul, Turkey;

    Michigan State Univ, Dept Hort, A212 Plant & Soil Sci, E Lansing, MI 48824 USA;

    Michigan State Univ, Dept Mech Engn, E Lansing, MI 48824 USA;

    Michigan State Univ, Dept Geog Environm Spatial Sci, E Lansing, MI 48824 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Building energy; Building insulation; Heat flux; Plant species; Thermal performance;

    机译：建筑节能;建筑隔热;热通量;植物种类;热性能;

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