Study on the Influence of Window-wall Ratio on the Energy Consumption of Nearly Zero Energy Buildings

Guo, Feng; Chi, Dandan; Xu, Xiaolong; Dou, Baoyue; Sun, Yixin; Fu, Yao

doi:10.1016/j.proeng.2017.10.003

Cited by 52 publications

(32 citation statements)

References 4 publications

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“…Nevertheless, after an initial negative effect, when an increase of the average façade U-value is not sufficiently balanced by an increase of solar gains, the increment of WWR allows for reducing the heating demand. This is true for Turin, due to temperate climate conditions, while it is less apparent in Helsinki, in line with other studies [26]. When the window is facing north, the smallest values of heating energy needs correspond to the lowest WWR in both Helsinki and Turin, due to the limited amount of solar gains reaching north-facing façades in winter.…”

Section: Sensibility Analysis By Changing the Occupancy Valuesupporting

confidence: 89%

“…Nevertheless, the effect of passive cooling strategies or different thermal envelope characteristics were not included. Furthermore, the correlation between NZEB buildings and WWR was investigated in [26], considering a severely cold China location (Shenyang). A simple building was simulated in EnergyPlus to define heating and cooling energy needs in accordance with different WWRs and three orientations.…”

Section: Wwr and Energy Needs -A Short Background Analysismentioning

confidence: 99%

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Parametric Optimization of Window-to-Wall Ratio for Passive Buildings Adopting A Scripting Methodology to Dynamic-Energy Simulation

et al. 2019

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Counterbalancing climate change is one of the biggest challenges for engineers around the world. One of the areas in which optimization techniques can be used to reduce energy needs, and with that the pollution derived from its production, is building design. With this study of a generic office located both in a northern country and in a temperate/Mediterranean site, we want to introduce a coding approach to dynamic energy simulation, able to suggest, from the early-design phases when the main building forms are defined, optimal configurations considering the energy needs for heating, cooling and lighting. Generally, early-design considerations of energy need reduction focus on the winter season only, in line with the current regulations; nevertheless a more holistic approach is needed to include other high consumption voices, e.g., for space cooling and lighting. The main considered design parameter is the WWR (window-to-wall ratio), even if further variables are considered in a set of parallel analyses (level of insulation, orientation, activation of low-cooling strategies including shading devices and ventilative cooling). Finally, the effect of different levels of occupancy was included in the analysis to regress results and compare the WWR with corresponding heating and cooling needs. This approach is adapted to Passivhaus design optimization, working on energy need minimisation acting on envelope design choices. The results demonstrate that it is essential to include, from the early-design configurations, a larger set of variables in order to optimize the expected energy needs on the basis of different aspects (cooling, heating, lighting, design choices). Coding is performed using Python scripting, while dynamic energy simulations are based on EnergyPlus.

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Section: Sensibility Analysis By Changing the Occupancy Valuesupporting

confidence: 89%

Section: Wwr and Energy Needs -A Short Background Analysismentioning

confidence: 99%

Parametric Optimization of Window-to-Wall Ratio for Passive Buildings Adopting A Scripting Methodology to Dynamic-Energy Simulation

et al. 2019

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“…Many studies have been performed regarding the thermal performance of building elements [4][5][6][7], in particular, wall and roof elements. However, the effect of window-to-wall-area ratio on thermal behavior has been studied by only a few researchers [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], in which different wall and windows were investigated under different climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of window-to-wall-area ratio on thermal performance of building wall materials in Elazığ, Turkey

Özel

2020

PLoS ONE

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In this study, the effect of glazing-to-total-wall-area ratio on the thermal performance of different wall materials is numerically investigated in terms of heat transmission load. The investigation was performed for a South-facing wall in Elazığ, Turkey. The heat transmission load through walls and windows are determined separately for summer and winter climate conditions. In this analysis, the frame area of the window is not considered. Therefore, whereas the glazing area on uninsulated and insulated walls is increased from 0% to 100%, the heat gain and losses are calculated separately according to the glazing type. The transmission loads through the wall are determined by an implicit finite difference procedure under steady periodic conditions. Concrete, briquettes, bricks, and autoclaved aerated concrete are selected as structure materials. Results show that in the uninsulated wall, the wall material affected the glazing area, whereas in the insulated wall, the effect of wall material on glazing area is insignificant.

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“…Percentage of glazing area of a wall know as window-to-wall ratio (WWR) of a façade can have a significant impact on heat gain potential and thus energy consumption levels in terms of cooling and heating in buildings [39]. Aspect ratio of a plan form is another key geometric parameter that defines the building surface area by which heat is transferred between the interior and exterior environment [40] and the amount of façade area that is subject to solar gain.…”

Section: Heat Stress Through Building Façades In Tropicsmentioning

confidence: 99%

Heat Stress Pattern in Conditioned Office Buildings with Shallow Plan Forms in Metropolitan Colombo

Rajapaksha

2019

Buildings

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This paper critically evaluates indoor overheating of multilevel office buildings in Colombo—a tropical warm humid city. The work questions the building morphological characteristics on thermal performance and indoor climate, thus the levels of Building Energy Indices (BEI) of air conditioned buildings. Pattern of heat stress on buildings due to building characteristics and its relationship to the BEI were identified. A study of 87 multilevel office buildings contributed to identify two critical cases in shallow plan form with similar morphological characteristics such as wall-to-window ratio, aspect ratio, orientation, occupant and equipment density, and façade architecture. A comprehensive thermal performance investigation on these two critical cases quantified the heat stress patterns on their facades and thus indoor thermal environments. Indoor air temperature during office hours in 3 m × 3 m multizones across the depths and lengths in these two buildings showed deviations up to 10.5 °C above the set point temperature level (24 °C). Findings highlight the severity of heat stress on air conditioned indoor environments and the need to address this issue for energy sustainability of urban office buildings in the tropics.

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Study on the Influence of Window-wall Ratio on the Energy Consumption of Nearly Zero Energy Buildings

Cited by 52 publications

References 4 publications

Parametric Optimization of Window-to-Wall Ratio for Passive Buildings Adopting A Scripting Methodology to Dynamic-Energy Simulation

Parametric Optimization of Window-to-Wall Ratio for Passive Buildings Adopting A Scripting Methodology to Dynamic-Energy Simulation

Effect of window-to-wall-area ratio on thermal performance of building wall materials in Elazığ, Turkey

Heat Stress Pattern in Conditioned Office Buildings with Shallow Plan Forms in Metropolitan Colombo

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