Design optimization criteria for windows providing low energy demand in office buildings in Algeria

Badeche, Mounira; Bouchahm, Yasmina

doi:10.1016/j.indic.2020.100024

Cited by 18 publications

(10 citation statements)

References 20 publications

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“…Since windows are considered generally less energy efficient than walls, "tighter" envelopes with smaller windows are "encouraged" in energy efficiency guidelines. Most often the choice of glazing type, shading devices, orientation, and climate are the main parameters considered to define the size of the window (Badeche and Bouchahm 2020). Our research suggests that the criteria for the design of windows should give due importance to occupants' visual and psychological wellbeing (other than including further considerations not included in this study, such as circadian stimulation) ascribed to the window's provision of daylight and a view out.…”

Section: Discussionmentioning

confidence: 92%

Window Views: Difference of Perception during the COVID-19 Lockdown

Batool

Rutherford

McGraw

et al. 2021

LEUKOS

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The provision of daylight, fresh air, and of a view outdoors are among the known characteristics of windows. But how does the perception of a window differ when it becomes the primary way of connecting to the physical world outside? In the first half of 2020, many countries resorted to strict lockdown measures to control the spread of the SARS-CoV-2 virus. The impact of such confinement, and the restriction to movement and social contact between people, is currently undergoing intense research. As such, this study reports the findings of a global online survey, administered before and after the COVID-19 outbreak, aimed at identifying whether any significant difference related to the lockdown could be observed in the perception of windows. The results confirm a practically relevant increase in the importance given to windows as a way to provide an external view and a visual and social connection with other people. Conversely, the role of the window as a conveyor of information on weather and time of the day was less prevalent. This is one of the first studies evaluating the difference in the perception of windows within a period of enforced lockdown. The findings can help capture the psychological impacts of confinement on people and may be relevant when transferred to other domains where building occupants could strongly benefit from the restorative effects of window views.

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Section: Discussionmentioning

confidence: 92%

Window Views: Difference of Perception during the COVID-19 Lockdown

Batool

Rutherford

McGraw

et al. 2021

LEUKOS

View full text Add to dashboard Cite

show abstract

“…An inter-model validation model for annual heat loss is used in this article because its numerical results are compared with previous results in the literature. Badeche and Bouchahm [29] identify the optimum window-to-wall ratio (WWR) as 40-50% for energy saving in the Mediterranean climate. Goia [30] found that a WWR between 30-40% is needed for energy saving.…”

Section: Inter-model Validation Of the Articlementioning

confidence: 99%

Adaptive Thermal Comfort of an Office for Energy Consumption-Famagusta Case

Alibaba¹

2022

Nearly Zero Energy Building (NZEB) - Materials, Design and New Approaches

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The aim of this study was to determine how much thermal comfort can be obtained through heat/energy transfers between the office/external air and the transparent/opaque surfaces of an office by combining different transparent and opaque wall surface ratios with different window opening percentages using dynamic thermal simulations. It found that the optimum window-to-wall ratio (WWR) for energy conservation is 40%, with a 20% window opening ratio. The 80% and 90% thermal comfort ranges of the adaptive thermal comfort methodology are found in May, October, September, and the yearly average, while June and August are only in the range of 80% acceptability. The office constantly loses heat through air flow with any glass size on its external facade and any window opening ratio. Moreover, all sizes of opaque and transparent internal surfaces transferred heat from outside by conduction, while the opaque wall similarly always transferred energy to heat up the office air internally and outside air externally through convection. The external glass also heats the office air by convection, except in the months of January, November, and December.

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“…The main criteria of WWR were light density, climate, window orientation, internal gains, and building size. Xue et al [13] [16] investigated the most prominent factors towards window optimization. In semi-arid climate, window orientation was found to be the most prominent parameter.…”

Section: Analysis Of Previous Researchmentioning

confidence: 99%

A Fundamental Study on the Development of New Energy Performance Index in Office Buildings

et al. 2021

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Recently, there have been significant concerns regarding excessive energy use in office buildings with a large window-to-wall ratio (WWR) because of the curtain wall structure. However, prior research has confirmed that the impact of the window area on energy consumption varies depending on building size. A newly proposed window-to-floor ratio (WFR) correlates better with energy consumption in the building. In this paper, we derived the correlation by analyzing a simulation using EnergyPlus, and the results are as follows. In the case of small buildings, the results of this study showed that the WWR and energy requirement increase proportionally, and the smaller the size is, the higher the energy sensitivity will be. However, results also confirmed that this correlation was not established for buildings approximately 3600 m2 or larger. Nevertheless, from analyzing the correlation between the WFR and the energy requirements, it could be deduced that energy required increased proportionally when the WFR was 0.1 or higher. On the other hand, the correlation between WWR, U-value, solar heat gain coefficient (SHGC), and material property values of windows had little effect on energy when the WWR was 20%, and the highest effect was seen at a WWR of 100%. Further, with an SHGC below 0.3, the energy requirement decreased with an increasing WWR, regardless of U-value. In addition, we confirmed the need for in-depth research on the impact of the windows’ U-value, SHGC, and WWR, and this will be verified through future studies. In future studies on window performance, U-value, SHGC, visible light transmittance (VLT), wall U-value as sensitivity variables, and correlation between WFR and building size will be examined.

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Design optimization criteria for windows providing low energy demand in office buildings in Algeria

Cited by 18 publications

References 20 publications

Window Views: Difference of Perception during the COVID-19 Lockdown

Window Views: Difference of Perception during the COVID-19 Lockdown

Adaptive Thermal Comfort of an Office for Energy Consumption-Famagusta Case

A Fundamental Study on the Development of New Energy Performance Index in Office Buildings

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