Cost-optimal energy efficiency levels are the first step in achieving cost effective renovation in residential buildings with a nearly-zero energy target

Ferreira, Marco António Pedrosa Santos; Almeida, Manuela; Rodrigues, Ana

doi:10.1016/j.enbuild.2016.10.017

Cited by 56 publications

(29 citation statements)

References 25 publications

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“…Prerequisites for intervention using the BRESAER system include, according to each case, insulation upgrading to new base levels required by the EPBD 2010 normative for renovations (European Parliament 2010), as well as infiltration reduction and increase of internal reflectivity. These steps have been recognized among the first ones that must be carried out in order to improve energy savings and reach near-zero energy buildings (nZEBs) in retrofits (Ferreira, Almeida, and Rodrigues 2016). Different constructive techniques can be used to reach these requirements (DHPCLG 2015; Shapiro 2016).…”

Section: Prerequisites For the Systemmentioning

confidence: 99%

Adaptability in envelope energy retrofits through addition of intelligence features

Capeluto

2019

Architectural Science Review

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A large proportion of the existing building stock worldwide needs renovation and upgrading that will help comply with new energy codes and reduce fuel consumption and greenhouse gas emissions. Improvements with minimal interference to inhabitants can be achieved by upgrading facades using elements that enhance energy efficiency and user comfort. Prefabricated energy retrofit systems have been suggested, but at present many lack adaptability to weather and usage conditions. This paper presents BRESAER, a retrofit system that provides adaptability through combination of passive strategies and intelligence features, which can be used in different climates and diverse building types. Energy performance was analysed for five types of European climates, results are shown for two climate types and three usages. A comparison was made of the presented system with a mostly passive retrofit system. Results show that in both climates, adaptability provides higher energy savings, complying with current definitions of very low-energy buildings.

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Section: Prerequisites For the Systemmentioning

confidence: 99%

Adaptability in envelope energy retrofits through addition of intelligence features

Capeluto

2019

Architectural Science Review

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“…Under this concern umbrella, in Europe, the most recent updates to the directive on the energy performance of buildings [6] introduce two basic concepts: Cost-optimal energy, focused on monetary costs and almost zero-energy buildings (nZEB), focusing on the energy performance of buildings and the use of renewable energy produced on site. Studies in which these two concepts are articulated have emerged, such as the one developed by Ferreira et al [7].…”

Section: Thermal Insulation Effectivenessmentioning

confidence: 99%

The Effectiveness of Thermal Insulation in Lightweight Steel-Framed Walls with Respect to Its Position

Roque

Santos

2017

Buildings

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Lightweight steel-framed (LSF) construction, given its advantages, has the potential to reach high standards in energy and environmental performance of buildings, such as nearly zero-energy buildings (nZEB). When compared with traditional construction, LSF system offers distinct benefits in such fields as sustainability, cost-effectiveness, constructive process, and safety at work. Despite the benefits of this constructive system, the effect of thermal bridges in LSF elements, caused by the high thermal conductivity of the steel structure, can be a disadvantage. The excessive heat losses or gains through these thermal bridges are more relevant in buildings' exterior envelope, such as facade walls. These building components' thermal performance is crucial in the buildings' overall energetic behaviour, with a direct impact on energy consumption and resulting monetary costs during their operational stage. In this work the influence of the thermal insulation position on its effectiveness is evaluated in LSF facade walls. For this purpose, several LSF wall types are assessed, namely cold, warm, and hybrid construction. The influence of thermal bridges instigated by the steel studs in the LSF walls' overall thermal performance is evaluated as well. The computations are performed using specialized finite element software (THERM).

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“…When the objective of a building renovation is to reach a nearly zero target, this issue is even more pressing, because of the relevant use of renewable energy systems [6]. …”

Section: The Significance Of Considering Environmental Performance Inmentioning

confidence: 99%

“…This fact may contribute to missed opportunities for improving the buildings' energy performance. Investment costs concerning building renovations are likely to increase as the depth of the intervention increases and new materials and building integrated technical systems (BITS) are added to the building [6]. It is necessary then to address the trade-offs between the costs and effectiveness of interventions regarding energy performance improvements in existing buildings.…”

Section: Introductionmentioning

confidence: 99%

Relevance of Embodied Energy and Carbon Emissions on Assessing Cost Effectiveness in Building Renovation—Contribution from the Analysis of Case Studies in Six European Countries

2018

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Abstract:The construction sector is facing increasingly strict energy efficiency regulations. Existing buildings have specific technical, functional and economic constraints, which, in fulfilling regulations, could lead to costly and complex renovation procedures and also lead to missed opportunities for improving their energy performance. In this article, the methodology for comparing cost-optimality in building renovations, developed in the International Energy Agency (IEA)-Energy in Buildings and Communities (EBC) Annex 56 project, is extended with a life cycle assessment by including embodied primary energy and carbon emissions in the calculations. The objective is to understand the relevance of embodied energy and carbon emissions in the evaluation of the cost effectiveness of building renovation solutions towards nearly zero energy buildings, as well as the effect of the embodied values in the achievable carbon emissions and primary energy reductions expected in an energy renovation. Results from six case studies, representative of different regions in Europe, suggest that embodied values of energy and carbon emissions have a decreasing effect-ranging from 2 to 32%-on the potential reductions of energy and emissions that can be achieved with renovation measures in buildings. In addition, the consideration of the embodied energy and carbon emissions does not affect the ranking of the renovation packages.

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Cost-optimal energy efficiency levels are the first step in achieving cost effective renovation in residential buildings with a nearly-zero energy target

Cited by 56 publications

References 25 publications

Adaptability in envelope energy retrofits through addition of intelligence features

Adaptability in envelope energy retrofits through addition of intelligence features

The Effectiveness of Thermal Insulation in Lightweight Steel-Framed Walls with Respect to Its Position

Relevance of Embodied Energy and Carbon Emissions on Assessing Cost Effectiveness in Building Renovation—Contribution from the Analysis of Case Studies in Six European Countries

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