Application of the cost-optimal methodology to urban renewal projects at the territorial scale based on statistical data—A case study in Spain

Moreno, Sergi Aguacil; Lufkin, Sophie; Rey, Emmanuel; Cuchí, Albert

doi:10.1016/j.enbuild.2017.03.047

Cited by 38 publications

(22 citation statements)

References 38 publications

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“…These regulations have restricted both heating and cooling energy demands and have established maximum thermal transmittances for the elements that make up the thermal envelope of a building, depending on the climate zone in which the building is located. The most effective method for the energy refurbishment of the residential building stock is to increase the thermal insulation of the opaque elements of the thermal envelope; this increased insulation achieved average energy savings of 45% in Italy [12] and 40% in Spain [13]. In addition, Varela Luján et al [14] found that, in Spain, renovating façades using external thermal insulation composites reduced energy losses by 57% and energy gains by 39% compared to those with the façade in its original state.…”

Section: Introductionmentioning

confidence: 99%

Energy Renovation of Residential Buildings in Cold Mediterranean Zones Using Optimized Thermal Envelope Insulation Thicknesses: The Case of Spain

et al. 2020

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The residential sector of the European Union consumes 27% of the final energy of the European Union, and approximately two-thirds of the existing dwellings in the European Union were built before 1980. For this reason, the European Union aims to transform the existing residential building stock into nearly zero-energy buildings by 2050 through energy renovation. The most effective method to achieve this goal is to increase the thermal insulation of opaque elements of the thermal envelope. This study aims to assess the energy, environmental and economic impacts of the energy renovation of the thermal envelopes that are typical of the existing multi-family buildings of the 26 provincial capitals in the cold climate zones of Spain. To achieve this goal, the insulation thickness to be added to the walls, roof and first floor framework is optimized by a life cycle cost analysis, and the existing building openings are replaced, thus minimizing both the total heating costs and the total heating and cooling costs. The study uses four thermal insulation materials for four different heating and cooling systems in 10 different models. The results obtained will be used to propose energy renovation solutions to achieve nearly zero-energy buildings both in Spain and in similar Mediterranean climate zones.

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Section: Introductionmentioning

confidence: 99%

Energy Renovation of Residential Buildings in Cold Mediterranean Zones Using Optimized Thermal Envelope Insulation Thicknesses: The Case of Spain

et al. 2020

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“…Second, most case studies (23 of 30) used financial models to evaluate the retrofit's economic performance, although in the other case studies, authors simply calculated the energy savings number, as was suggested in the US Department of Energy guides described in the previous section. The authors note three popular approaches for financial evaluation: life cycle cost (Amiri et al, 2018;Becchio et al, 2016;Jafari 2017;Qian Wang et al, 2014), payback period (Aguacil et al,2017;Ashrafian et al, 2016;Tahsildoost et al, 2015), and net present value (Becchio et al, 2016;Hosseinian et al, 2017;Senel Solmaz et al, 2018;Qinpeng Wang et al, 2017). All of these approaches focus on the economic benefits of the life-long service of the building, say, the energy savings from daily operation subtracting the initial cost of retrofit projects.…”

Section: Case Study Reviewmentioning

confidence: 99%

A Proposed Lean Decision-Making Process for Building Energy Retrofits

Ding¹,

Parish²

2019

Proc. 27th Annual Conference of the International Group for Lean Construction (IGLC)

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Buildings are one of the largest contributors of greenhouse gas emissions and, in the United States, they are the largest energy users. To combat these emissions, policy makers suggest retrofitting older buildings to achieve better energy performance. (The authors define retrofit as any changes to an existing building that improve the building's ability to perform or extend the building's life.) Despite consensus that buildings should be retrofit, building owners may struggle to identify how to retrofit their building. This paper addresses this gap by providing a proposed lean process, rooted in Choosing by Advantages (CBA), for selecting among potential energy retrofit options.In this paper, the authors present the energy retrofit decision-making process recommended by the U.S. Department of Energy and compare it to those used in practice on case studies completed in the last five years. The authors identified two shortcomings in the implemented processes: first, the decision-making processes only consider the designers' perspective on energy and cost savings with little involvement from other stakeholders, and thus, they may ignore the needs, desires, and opinions of others with non-design backgrounds; second, these processes consider more design alternatives than may be realistic for a building owner given budget and schedule constraints.To make the process leaner, the authors propose a new energy retrofit decisionmaking process, rooted in CBA, that addresses the previously-identified shortcomings. This process involves more stakeholders in the decision-making process. Moreover, this process helps decision-makers focus on the most promising design alternatives, thereby supporting better use of time and increased likelihood of a successful retrofit.

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“…Lastly, renewable energy resources should be integrated with the active systems to reduce the fuel consumption and CO2 emission associated with it. Aguacil et al [9] indicated that passive strategies could provide 40% of energy saving, while it is possible to reach 80% saving by combining passive strategies with active ones.…”

Section: Introductionmentioning

confidence: 99%

Life Cycle Energy Assessment of a School Building under Envelope Retrofit: An Approach towards Environmental Impact Reduction

Moazzen

Karagüler²,

Ashrafian

2019

E3S Web Conf.

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Energy efficiency of existing buildings is a concept to manage and restrain the growth in energy consumption and one of the crucial issues due to the magnitude of the sector. Educational buildings are in charge of about 15% of the total energy consumption of the non-residential building sector. However, not only operational but also embodied energy of a building should be reduced to get the overall benefits of energy efficiency, where, using energy efficient architectural measures and low emitting materials during every retrofit action can be a logical step. The majority of buildings in Turkey and EU was built earlier than the development of the energy efficiency in the construction sector, hence, without energy retrofit, consume an enormous amount of energy that can be averted significantly by the implementation of some even not advanced retrofit measures. Furthermore, demolishing of a building to construct a new one is not a rational approach concerning cost, time and environmental pollution. The study has been focused on the impact assessment of the various architectural scenarios of energy efficiency upgrading on the Life Cycle Energy Consumption (LCEC) and Life Cycle CO2 (LCCO2) emission. Within the scope of the study, a primary school building is selected to be analysed. Through analysis, the total embodied and operational energy use and CO2 emission regarding the life cycle phase of the building is quantitatively defined and investigated in the framework of life cycle inventory. The paper concentrates on the operation and embodied energy consumption arising from the application of a variety of measures on the building envelope. An educational building with low LCCO2 emissions and LCEC in Turkey is proposed. To exemplify the approach, contributions are applied to a case study in Istanbul as a representative school building. The primary energy consumption of the case study building is calculated with a dynamic simulation tool, EnergyPlus. Afterwards, a sort of architectural energy efficient measures is implemented in the envelope while the lighting and mechanical systems remain constant. The energy used in the production and transportation of materials, which are the significant parts of the embodied energy, are taken into account as well.

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Application of the cost-optimal methodology to urban renewal projects at the territorial scale based on statistical data—A case study in Spain

Cited by 38 publications

References 38 publications

Energy Renovation of Residential Buildings in Cold Mediterranean Zones Using Optimized Thermal Envelope Insulation Thicknesses: The Case of Spain

Energy Renovation of Residential Buildings in Cold Mediterranean Zones Using Optimized Thermal Envelope Insulation Thicknesses: The Case of Spain

A Proposed Lean Decision-Making Process for Building Energy Retrofits

Life Cycle Energy Assessment of a School Building under Envelope Retrofit: An Approach towards Environmental Impact Reduction

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