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Evaporative cooling in building roofs: Theoretical modeling and experimental validation (Part-1)

机译：建筑屋顶蒸发冷却：理论建模和实验验证（第1部分）

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摘要

This study aims to introduce and experimentally validate a model to predict the potential of evaporative cooling as a way to mitigate unwanted heat gain in buildings' roofs. The experimental setup, which emulates a roof on a small-scale, was developed to independently measure the instantaneous heat flux permeating through two equal porous medium samples under the same environmental conditions, with the only difference that one was completely dry and other was fully wet, thus creating a reference heat gain value to which the wet, evaporative sample could be compared. The numerical model solves an energy balance within the porous sample and a surface energy balance at its upper surface while considering the environment's temperature, humidity, wind speed and solar irradiation as boundary conditions. The experimental and numerical model have their results compared for two different conditions: (i) steady-state and indoors without solar irradiation and (ii) transient outdoors under real weather. The direct comparison showed that the theoretical model developed is capable of predicting, with good accuracy, the heat flux flowing through the porous medium for most tests and that the wet porous medium can, for certain conditions, outperform its dry counter version, despite having higher thermal conductivity and absorptance due to its wetness.
机译：本研究旨在介绍和实验验证模型以预测蒸发冷却的可能性，以便在建筑物屋顶上减轻不需要的热量增益。模拟小规模的屋顶的实验装置是开发的，以独立测量在相同的环境条件下通过两个等于多孔介质样品渗透的瞬时热量通量，其中一个完全干燥的唯一差异是完全潮湿的因此，可以产生湿，蒸发样品的参考热增益值。数值模型在考虑环境的温度，湿度，风速和太阳照射作为边界条件的同时，解决了多孔样品内的能量平衡和其上表面的表面能平衡。实验和数值模型与两个不同的条件相比，它们的结果：（i）稳态和室内没有太阳照射和（ii）在真实天气下瞬间户外。直接比较表明，制定的理论模型能够以良好的精度预测流过多孔介质的热量，湿多孔介质可用于某些条件，尽管具有更高的情况由于其湿度而导热和吸收率。

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  • 来源
    《Solar Energy》 |2020年第9期|1122-1131|共10页
  • 作者

    da Veiga Arthur P.; Guths Saulo; da Silva Alexandre K.;

  • 作者单位

    Univ Fed Santa Catarina Dept Mech Engn BR-88040900 Florianopolis SC Brazil;

    Univ Fed Santa Catarina Dept Mech Engn BR-88040900 Florianopolis SC Brazil;

    Univ Fed Santa Catarina Dept Mech Engn BR-88040900 Florianopolis SC Brazil;

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

    Evaporative cooling; Heat transfer in roofs; Building passive cooling;

    机译：蒸发冷却;屋顶的热转印;建筑被动冷却;

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