Transparent Building Envelope: Windows and Shading Devices Typologies for Energy Efficiency Refurbishments

Cellai, Gianfranco; Carletti, Cristina; Sciurpi, Fabio; Secchi, Simone

doi:10.1007/978-3-319-03074-6_2

Cited by 21 publications

(15 citation statements)

References 5 publications

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“…Several works presented the importance and significance of renewable energy use in buildings, suggesting programs, methods, and strategies to incorporate renewable sources in retrofit actions [151][152][153][154][155]. The most frequent type of energy measures in building retrofits concerns the demand side [156][157][158][159][160][161][162][163], where a decrease in a building's energy demand is achieved by introducing new technologies, thermal storage or heat recovery systems [164][165][166][167], or through the use of passive technologies [168] such as shading systems [169][170][171][172], natural ventilation [173,174] and site planning [175][176][177]. Lastly, building energy demand could also be significantly reduced simply by a change in energy consumption patterns [178,179].…”

Section: General Overviewmentioning

confidence: 99%

Energy Retrofit in European Building Portfolios: A Review of Five Key Aspects

2020

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The research about energy efficiency in buildings has exponentially increased during the last few years. Nevertheless, both research and practice still cannot rely on complete methodologies tailored for building portfolios as a whole, because the attention has always been drawn to individual premises. Yet, energy efficiency analyses need to go beyond the single building perspective and incorporate strategic district approaches to optimize the retrofit investment. For this purpose, several aspects should be considered simultaneously, and new methodologies should also be promoted. Therefore, this paper aims to discuss energy retrofit campaigns in building portfolios, drawing an exhaustive and updated review about the challenge of jumping from the single-building perspective to a stock-based analysis. This research discusses the publications available on the topic from five key aspects that are all essential steps in achieving a complete and reliable study of energy efficiency at a portfolio level. They are energy modelling and assessment, energy retrofit design, decision-making criteria assessment, optimal allocation of (financial) resources and risk valuation. This review, therefore, advocates for joint consideration of the problem as a basis on which to structure further disciplinary developments. Research gaps are highlighted, and new directions for future research are suggested.

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Section: General Overviewmentioning

confidence: 99%

Energy Retrofit in European Building Portfolios: A Review of Five Key Aspects

2020

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“…In order to reach the green building standard, optimal sun protection is essential to decrease the energy demand for cooling and lighting and therefore to minimize the total energy demand. The glazed surface area and the shading system determine the amount of light that enters the interior space, the cooling energy demand being inversely proportional to the need for artificial lighting [5].…”

Section: Typology and Efficiency Of Shading Systemsmentioning

confidence: 99%

7. Influence of Shading Systems on Energy Performance of Buildings With Large Glazing Areas

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2020

Proceedings of International Conference Building Services and Energy Efficiency

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The paper aims at evaluating the energy performance of an average office building characterized by high glazing ratio and various shading degrees. Two hypotheses have been considered and compared: i) the building without shading and ii) the building having a fixed shading system with vertical and horizontal elements. Results show a small increase in heating energy demand of 18,18% because of the blocked heat gains during winter and a significant decrease in cooling energy demand of 80,69%. By using a mobile shading system, the zero energy target can be achieved beginning with the end of March up to the beginning of November (except for one third of July and one third of August).

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“…They are also used for the energy efficiency improvement of existing buildings adding also value to the renewal of their façade design. 44 A well-designed shading device can maximize heat gains in winter and reduce the radiant heat in summer, as well as improve visual and acoustic comfort in the interior. The effectiveness of sun protection depends on different factors such as the characteristics of the screen materials and finishing, the solar shading solution (fixed or mobile) and the screen disposition according to façade exposition and geographical location (parallel or orthogonal to the façade, horizontal, vertical, etc.).…”

Section: External Shading Devicesmentioning

confidence: 99%

The use of façade sun shading systems for the reduction of indoor and outdoor sound pressure levels

2019

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External shading devices are widely used in recent buildings because they reduce the greenhouse effect due to the solar irradiation through transparent surfaces and the glare effects in interiors. The acoustic effects of these devices have not been well investigated in the literature. In this article, we use a bi-dimensional pressure acoustics finite element model of a shading device attached to a building façade, in frequency domain, to analyse the effects both in the indoor and in the outdoor environments. The finite element model was validated with experimental measurements carried out in a semi-anechoic chamber and then extended to an urban scale to evaluate the effect in the reduction of outdoor noise due to traffic. To improve the acoustic effect of the shading device, a sound absorbing material was added to the bottom side of each louvre. Results of the simulations show that external shading devices tend to increase the sound pressure level over the building façade, while the introduction of the sound absorbing material behind each louvre reduces this problem. The dependencies of the sound pressure level reduction to the geometrical factors of the shading device were investigated by means of the finite element model. The installation of louvres on a building façade can affect also the sound pressure level over a façade of a building placed 20 m away, across a road. In this article, both the effect over the façade of the opposite building and the effect over the urban area between the two buildings are analysed.

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Transparent Building Envelope: Windows and Shading Devices Typologies for Energy Efficiency Refurbishments

Cited by 21 publications

References 5 publications

Energy Retrofit in European Building Portfolios: A Review of Five Key Aspects

Energy Retrofit in European Building Portfolios: A Review of Five Key Aspects

7. Influence of Shading Systems on Energy Performance of Buildings With Large Glazing Areas

The use of façade sun shading systems for the reduction of indoor and outdoor sound pressure levels

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