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The effect of a reflective underlay on the global thermal behaviour of pitched roofs

机译：反射性衬垫对斜屋顶整体热行为的影响

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摘要

The influence of the emissivity of a roof underlay on the global thermal behaviour of sloped roofs is investigated. Five well-insulated pitched roofs have been constructed in a test building. The five roofs have a south-west and north-east-oriented pitch and differ in long wave emissivity of the underlay. All roofs are equipped with thermocouples and heat fluxes sensors to evaluate the thermal response of the roofs to the climatic conditions. Both summer and winter conditions have been measured. In addition to the in situ evaluation, a laboratory experiment was set-up to evaluate the influence of the emissivity of the underlay on the summer behaviour of a sloped roof under fixed boundary conditions. With ther-mocouples and heat flux sensors at different heights in the roof the effect of the reflective foil on the heat gain to the inside could be evaluated. The measured data are compared with a simple numerical model that accounts for the buoyancy effects in the ventilated cavity between tiles and underlay. Laboratory experiments and simulations revealed that a low emissivity of the underlay decreases the heat gain to the indoor environment, but that due to the thermal stack flow in the air cavity underneath the tiles, the advantage of a reflective foil mainly plays a role in the bottom part of the roof. In the in situ measure-ments it was found that workmanship, airtightness and wind and thermal stack effects are much more important and disturb the possible benefits of using a reflective underlay.
机译：研究了屋顶垫层的发射率对倾斜屋顶的整体热行为的影响。在测试大楼中，已经建造了五个隔热良好的斜屋顶。这五个屋顶具有西南方向和东北方向的螺距，并且衬层的长波发射率不同。所有屋顶都装有热电偶和热通量传感器，以评估屋顶对气候条件的热响应。夏季和冬季条件均已测量。除现场评估外，还建立了实验室实验，以评估固定边界条件下垫层的发射率对倾斜屋顶的夏季性能的影响。通过在屋顶不同高度的热电偶和热通量传感器，可以评估反射箔对内部热量吸收的影响。将测得的数据与一个简单的数值模型进行比较，该数值模型说明了瓷砖和底层之间通风腔中的浮力效应。实验室实验和模拟表明，底层的低发射率会降低对室内环境的热量吸收，但是由于瓷砖下方空气腔中的热堆栈流动，反射箔的优势主要在底部起作用屋顶的一部分。在现场测量中，发现工艺，气密性以及风和热堆叠的影响更为重要，并且干扰了使用反射式衬垫的可能好处。

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  • 来源
    《Building and Environment》 |2011年第1期|p.134-143|共10页
  • 作者

    S. Roels; M. Deurinck;

  • 作者单位

    K.U.Leuven, Department of Civil Engineering, Division of Building Physics, Kasteelpark Arenberg 40, B-3001 Leuven, Belgium;

    rnK.U.Leuven, Department of Civil Engineering, Division of Building Physics, Kasteelpark Arenberg 40, B-3001 Leuven, Belgium;

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

    pitched roofs; underlay; radiant barrier; thermal behaviour;

    机译：斜屋顶底层辐射屏障热行为;

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