AN EMPIRICAL STUDY ON THE USE OF WATER FILM IN GLAZED BUILDINGS TO REDUCE SOLAR RADIATION TRANSMITTANCE IN THE TROPICS

Abdultawab M. Qahtan

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AN EMPIRICAL STUDY ON THE USE OF WATER FILM IN GLAZED BUILDINGS TO REDUCE SOLAR RADIATION TRANSMITTANCE IN THE TROPICS

机译：水膜在玻璃建筑中使用水膜以降低热带太阳辐射透射率的实证研究

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摘要

Solar radiation is the cause of large heat gain in glazed buildings particularly in the tropics, thus the aim of this study is to investigate the impact of a sustainable water film on glazing transmittance to solar radiation. The experimental investigation measured two parameters, namely, type of glazing and solar radiation intensity, utilizing glazed facades oriented west in two full-scale rooms. It was found that the water film on the glazed facade increases the transmittance of solar radiation behind the glazing by 2% - 6.8% depending on the solar intensity and glass type, while the indoor temperature was reduced. The study concluded that the increment of the solar radiation (300-2500nm) transmittance is an increment in the range of the visible light (daylighting).

机译：太阳辐射是釉面建筑物中的大量热量的原因，特别是在热带地区，这项研究的目的是研究可持续水膜对太阳辐射的玻璃透射率的影响。实验研究测量了两个参数，即玻璃和太阳辐射强度的类型，在两个全尺寸的房间里使用玻璃外墙。发现玻璃外墙上的水膜增加了太阳能强度和玻璃类型的玻璃窗后面的太阳辐射的透射率，而室内温度降低。该研究得出结论，太阳辐射（300-2500nm）透射率的增量是可见光范围内的增量（日光）。

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来源
《Journal of green building》 |2015年第4期|141-160|共20页
作者
Abdultawab M. Qahtan;
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作者单位

Department of Architecture Faculty of Engineering Najran University 1988 Najran KSA;

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原文格式 PDF
正文语种 eng
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关键词
solar radiation; transmittance; light; water film; glazed building; tropics;

机译：太阳辐射;透射率;光;水膜;釉面建筑;热带;

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1. Experimental determination of thermal performance of glazed facades with water film, under direct solar radiation in the tropics [J] . Abdultawab Qahtan, Nila Keumala, S.P. Rao, Building and Environment . 2011,第11期

机译：热带地区直接太阳辐射下水膜玻璃幕墙热性能的实验测定
2. Tuning control of buildings glazing's transmittance dependence on the solar radiation wavelength to optimize daylighting and building's energy efficiency [J] . Jeong Tai Kim, Marija S. Todorovic Energy and Buildings . 2013,第auga期

机译：调节建筑玻璃的透射率与太阳辐射波长的关系，以优化日光和建筑的能源效率
3. Will multi-facade systems reduce cooling energy in fully glazed buildings? A scoping study of UAE buildings [J] . Hassan Radhi, Stephen Sharpies, Fayze Fikiry Energy and Buildings . 2013,第JANa期

机译：多立面系统会减少全玻璃建筑物的冷却能量吗？阿联酋建筑物范围界定研究
4. Experiment study on indoor thermal environment of glazed building under simulated solar radiation [C] . Zhu Yue, Zhang Jili 第一届“一带一路”可持续制冷与空调国际研讨会论文集 . 2016

机译：模拟太阳辐射下玻璃建筑室内热环境的实验研究
5. Landscape & building solar loads: Development of a computer-based tool to aid in the design of landscape to reduce solar gain and energy consumption in low-rise residential buildings. [D] . Osborne, Aran Morrow. 2009

机译：景观和建筑的太阳能负载：开发一种基于计算机的工具，以协助景观设计，以减少低层住宅建筑的太阳能获取和能源消耗。
6. Solution-Processed VO2-SiO2 Composite Films with Simultaneously Enhanced Luminous Transmittance Solar Modulation Ability and Anti-Oxidation property [O] . Lili Zhao, Lei Miao, Chengyan Liu, -1

机译：同时提高透光率太阳调制能力和抗氧化性能的固溶VO2-SiO2复合薄膜
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。

AN EMPIRICAL STUDY ON THE USE OF WATER FILM IN GLAZED BUILDINGS TO REDUCE SOLAR RADIATION TRANSMITTANCE IN THE TROPICS

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