Energy Saving Potential with a Double-Skin Roof Ventilated by Natural Convection in Djibouti

Omar, Abdou Idris; Virgone, Joseph; Vergnault, Etienne; David, Damien; Idriss, Abdoulkader Ibrahim

doi:10.1016/j.egypro.2017.11.149

Cited by 27 publications

(15 citation statements)

References 13 publications

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“…This method can reduce heat gains up to 71% as recorded in tropical climates [56]; it may be less efficient if the upper layer has less ability to absorb or reflect heat and its efficiency in this situation would drop to 25% [57]. The efficiency can be increased by up to 85% if a reflective layer is used in the upper slab [2,56,58]. No paper discussed the payback period for this method; however, it is likely to take a long time depending on the construction features of the secondary roof.…”

Section: Double-skin Roofsmentioning

confidence: 99%

“…Building shape, location, materials, and elements of design, all play significant roles in energy performance inside a building [1], and consequently, the role of architects is to integrate them to produce a sustainable building and save energy usage. When designing a building, unfortunately roofs have not received much attention, yet the roof of building plays an essential role in building sustainability, as it absorbs thermal energy significantly in hot climates [2]. On the other hand, a significant amount of thermal energy is lost in cold days from roofs.…”

Section: Introductionmentioning

confidence: 99%

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A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness

Abuseif

Gou

2018

Energies

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The roofs of buildings play an essential role in energy efficiency because a significant amount of solar radiation is absorbed by roofs in hot weather and a significant amount of heat is lost through roofs in cold weather. This paper is a systematic literature review about roofing methods for flat roofs. Ten roofing methods are reviewed in this paper. They are concrete roof, cool roof, insulated roof, roof garden, photovoltaic panels’ roof, biosolar roof, double-skin roof, roof ponds, skylight roof, and wind catcher. The review covers each roof’s main features, heat flux reductions, payback periods, and the appropriate climate for its implementation. Furthermore, the basic principles for selecting appropriate roofing methods are discussed and future studies for integrating these roofing methods are suggested. Some of these methods can eliminate the need of installing HVAC (Heating Ventilation and Air-conditioning) systems and others can achieve a high percentage of heat reduction if they are the right choice and they are implemented in the right circumstances. An incorrect selection could result in mild to severe energy penalties. The review contributes to the increasing knowledge about sustainable roofing and helps designers to increase building energy efficiency by selecting the appropriate roofing method.

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Section: Double-skin Roofsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness

Abuseif

Gou

2018

Energies

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“…Some of these studies have examined the effect of different roof types on the energy performance of buildings. Generally, studies have shown that green and photovoltaic roofs offer many benefits such as reducing rainwater flow, improving air quality, reducing energy costs for heating and cooling, and shading and absorbing sunlight [14]. Thermal insulation thicknesses were also analyzed [15].…”

Section: Introductionmentioning

confidence: 99%

The The Effects of Structural Lightweight Concrete on Energy Performance and Life Cycle Cost in Residential Buildings

Nayır

Bahadır

Erdoğdu

et al. 2021

Period. Polytech. Civil Eng.

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Energy efficiency in the construction industry is crucial to reducing increased energy consumption. A significant portion of the energy is consumed in residential buildings. Thermal properties of the materials used in the building envelope can reduce the energy consumed in the buildings and thus contribute to the building economy. For this purpose, in the study, structural lightweight concretes (SLWC) with a lower thermal conductivity than normal weight concrete (NWC) were produced and energy efficiency and life cycle costs were compared between these concretes on a 1 + 1 reference flat. The compressive strength, unit weights and thermal conductivity coefficients of SLWCs and NWC were determined experimentally. Heating and cooling energy consumption and life cycle costs for the flat were calculated using the DesignBuilder simulation program according to the different concrete types produced. The results indicate that the thermal conductivity coefficients of all SLWCs produced were about 37–45 % lower than those of NWC. All mixes of the SLWCs provided energy saving by about 18–25 % compared to the NWC and two SLWCs reduced the life cycle cost by 4 %. In addition, the results showed that the best SLWC about energy was not the best SLWC about life cycle cost.

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“…Different strategies exist to protect the building from sun heat loads such as shading devices [3][4][5][6], surrounding vegetation [7][8][9], angular and spectral selective coatings [10][11][12][13][14][15][16][17][18] and double-skin facades or roofs [19][20][21][22]. Other technical solutions exist to exploit cooling from the environment, such as night sky cooling systems [23][24][25][26][27], natural ventilation [3,26,[28][29][30][31] and ground cooling [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

A new set of indicators to evaluate the bioclimatic performance of air conditioned buildings in a hot and humid climate

Omar

David

Vergnault

et al. 2020

Journal of Building Engineering

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The current challenge is to reduce the building energy consumption, in hot and humid climates, for which air conditioning is widespread. Up to now, the lack of criteria that identify the available cooling resources and the level of performance of technical solution has represented the major obstacle. To address these issues, the authors propose a new set of indicators to fully inform the decision-making process of the bioclimatic design of fully space-conditioned buildings in a hot and humid climate. This set of indicators provides an overview of the exploitable environmental resource (external air through external convection, natural ventilation and sky radiation cooling) referred as the Environmental Resource Indicators and of the capacity of the building to exploit those resources referred as the Building Performance Indicators. The indicators are implemented for a very basic two-story residential building in the hot, humid climate of Djibouti. The case study shows not only the ability of the indicators to reflect the bioclimatic performances of the buildings but also their ability to give an overview of the building heat exchanges, from which the implication of improper bioclimatic solutions on building cooling consumptions can easily be identified. These indicators are a means to help choose which technical solutions are most suited to the local climate, which is very useful for designers and architects in the early stages of building design.

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Energy Saving Potential with a Double-Skin Roof Ventilated by Natural Convection in Djibouti

Cited by 27 publications

References 13 publications

A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness

A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness

The The Effects of Structural Lightweight Concrete on Energy Performance and Life Cycle Cost in Residential Buildings

A new set of indicators to evaluate the bioclimatic performance of air conditioned buildings in a hot and humid climate

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