Energy performance assessment of venetian blinds in south-oriented residential spaces in hot arid desert climates

IF 3.1 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Construction Innovation-England Pub Date : 2023-05-11 DOI:10.1108/ci-03-2022-0052
Khaled El-Deeb
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Abstract

Purpose Window shading has always been an effective technique to control the access of solar radiation; however, inappropriate selection of the shading technique, location and optical properties may lead to an increase in energy consumed for cooling and artificial lighting. Venetian blinds (VBs) are a type of adjustable shading devices that can be installed to the interior, exterior or in between glass panes of a window and that can be easily implemented in both new and existing buildings. This study aims to investigate the impact of three VB parameters: slat angle, reflectivity and location on the overall energy consumption of a residential space with a south-facing facade under the hot arid desert climate of Saudi Arabia’s capital, Riyadh. For the purpose of globalizing the findings, the same investigations were applied for two other cities of similar climates: Cairo, Egypt, and Arizona, the USA. Design/methodology/approach A test room was modelled for energy simulation, with a 20% window-to-wall ratio. A VB was assigned with alternatives of being located to the indoor, outdoor or in between double glass panes. High, medium and low reflectivity values were applied at each location at slat angle alternatives of 15°, 30°, 45°, 60°, 75° and 90°. Findings Results showed VB performance across slat angles, where up to 20.1% energy savings were achieved by mid-pane high reflectivity VBs in Riyadh, while the value exceeded 30% in case of being externally located. A similar performance pattern occurred in the other two cities of hot arid desert climates: Cairo and Arizona. Research limitations/implications The study is limited to VBs at a fixed position, with no upward movement for partial or full openness conditions. The effect of blind control and operation on performance, such as the amount and duration of openness/closure of the blind and changes in slat angle across time, in addition to VB automation, shall be investigated in a future study. Practical implications The better understanding of VB energy performance achieved would enhance a more rational selection of VBs, which would benefit the construction industry as it would assist designers, real estate developer companies, as well as end-users in the decision-making process and help to realize energy-efficient solutions in residential buildings. VB production entities would also benefit by manufacturing and promoting for energy-efficient products. Originality/value In this study, a matrix of combinations of three VB parameters was developed, and the effect of these combinations on the overall energy consumption of both artificial lighting and heating, ventilation and air conditioning (HVAC) systems was evaluated and compared to identify the combinations of higher efficiency. The literature showed that these three parameters were hardly investigated in a combined form and hardly assessed by considering the overall energy consumed by both artificial lighting and HVAC.
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炎热干旱沙漠气候下南向居住空间百叶百叶窗节能性能评价
目的窗户遮光一直是控制太阳辐射进入的有效技术;然而,遮光技术、位置和光学特性的不适当选择可能导致冷却和人工照明所消耗的能量增加。百叶窗(VBs)是一种可调节的遮阳装置,可以安装在窗户的内部、外部或玻璃板之间,并且可以在新建筑和现有建筑中轻松实施。本研究旨在调查在沙特阿拉伯首都利雅得炎热干旱的沙漠气候下,百叶窗角度、反射率和位置三个VB参数对朝南立面住宅空间整体能耗的影响。为了使研究结果全球化,对另外两个气候相似的城市进行了同样的调查:埃及开罗和美国亚利桑那州。设计/方法/方法为能源模拟建模了一个试验室,窗墙比为20%。VB被分配到室内、室外或双层玻璃之间的替代位置。在15°、30°、45°、60°、75°和90°的缝翼角备选方案下,在每个位置应用高、中、低反射率值。结果显示,VB在缝翼角上的性能,其中利雅得的中窗格高反射率VBs可实现高达20.1%的节能,而位于外部的情况下,该值超过30%。类似的表现模式出现在其他两个炎热干旱沙漠气候的城市:开罗和亚利桑那州。研究局限性/含义该研究仅限于固定位置的VBs,在部分或完全开放的条件下没有向上移动。百叶窗控制和操作对性能的影响,如百叶窗打开/关闭的数量和持续时间,以及百叶窗角度随时间的变化,以及VB自动化,应在未来的研究中进行研究。实际意义更好地了解VB的能源性能将有助于更合理地选择VB,这将有利于建筑业,因为它将帮助设计师、房地产开发商公司以及最终用户参与决策过程,并有助于在住宅建筑中实现节能解决方案。VB生产实体也将受益于生产和推广节能产品。独创性/价值在本研究中,开发了三个VB参数的组合矩阵,并评估和比较了这些组合对人工照明和供暖、通风和空调(HVAC)系统整体能耗的影响,以确定效率更高的组合。文献表明,这三个参数很难以组合的形式进行研究,也很难通过考虑人工照明和暖通空调消耗的总能量进行评估。
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来源期刊
Construction Innovation-England
Construction Innovation-England CONSTRUCTION & BUILDING TECHNOLOGY-
CiteScore
7.10
自引率
12.10%
发文量
71
期刊最新文献
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