A sensitivity analysis of a cost optimality study on the energy retrofit of a single-family reference building in Portugal

Tadeu, Sérgio Fernando; Tadeu, A.; Simões, N.; Gonçalves, Márcio; Prado, Racine Tadeu Araújo

doi:10.1007/s12053-018-9645-5

Cited by 15 publications

(9 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mediterranean traditional buildings are usually considered "sustainable" and energyefficient due to their arrangement in compact districts [48,49] and to the use of specific architectural "types" [50][51][52] or technical "solutions" [53,54] on the building scale. However, the current energy emergency, the comfort requirements for users, and in-progress environmental changes can threaten this concept [55,56].…”

Section: Historic Districts In Mediterranean Cities and Resilient Strategies For Climate Changementioning

confidence: 99%

An Energy-Resilient Retrofit Methodology to Climate Change for Historic Districts. Application in the Mediterranean Area

Cantatore

Fatiguso

2021

Sustainability

View full text Add to dashboard Cite

Focusing on the uncertainties of climate change and its effects on the built environment, on the energy responsibilities of residential building stock and on the dichotomy between the transformation and preservation of cultural heritage with a long-term perspective, this paper proposes a detailed methodology aimed at managing energy retrofit transformations and preservation actions in historic districts following “resilience thinking.” The proposed methodology pursues the traditional process of retrofitting for cultural heritage, and identifies—on building and component scales—a structural process aimed at: (i) recognizing and testing the adaptive qualities of traditional built constructions to climate change based upon the genius loci experience; (ii) diagnosing critical energy emergencies which occurred due to historical transformations or exposure to criticalities of climate change; (iii) identifying and managing improvement requirements according to priority levels of transformation (MUERI). The test on a representative case study in the south of Italy (Mediterranean area) highlighted some significant results: (i) the importance of compactness and of light-colored materials in fighting local microclimate alterations; (ii) the pivotal responsibility of roofs in current and future trends in energy consumption, promoting and testing both innovative and traditional solutions; (iii) the reduction into a limited number of buildings cases to assess, solving the complex and various combinations of features, with which suitable solutions and guidelines are associated.

show abstract

Section: Historic Districts In Mediterranean Cities and Resilient Strategies For Climate Changementioning

confidence: 99%

An Energy-Resilient Retrofit Methodology to Climate Change for Historic Districts. Application in the Mediterranean Area

Cantatore

Fatiguso

2021

Sustainability

View full text Add to dashboard Cite

show abstract

“…However, both for those built before 1960 [34] and for historic buildings [35], replacing low-efficiency energy systems with high-efficiency ones is substantially more cost effective than improving the envelope insulation. Actually, investing in high-efficiency equipment even reduces the need to improve the insulation of the façades, which is usually one of the most expensive measures [36].…”

Section: Definition Of the Reference Buildingmentioning

confidence: 99%

“…This is 13.4% of the figure reported by SCE. This percentage was adopted in this work as a reduction factor for the useful energy needs for heating estimated by the seasonal method [36].…”

Section: Energy Needs Of the Reference Scenariomentioning

confidence: 99%

Procedure to select combined heating and hot water systems: An expeditious cost optimality approach

Tadeu

Gonçalves

Simões

et al. 2019

Journal of Building Engineering

Self Cite

View full text Add to dashboard Cite

The European Union has proposed a common methodology to identify energy-efficient measures with the minimum global cost throughout the lifecycle. It is known that the energy impact of a specific measure is influenced by other measures in the same package, which affect its profitability. For this reason, the cost-optimal package cannot be a simple combination of individual cost-optimal retrofitting measures. Thus, to define a cost optimal solution, the energy performance and the global cost of a large number of packages need to be calculated and analysed. To overcome the expensive computational effort of this type of study, this work proposes an expeditious procedure for selecting the optimal energy source for heating and domestic hot water (DHW) service generation as a function of the following variables: energy needs and costs, initial investment, primary energy conversion factors and efficiency of energy systems. The method was applied to a reference dwelling in the Portuguese building stock. With the expeditious cost optimality approach, once an energy system configuration has been determined, an estimation of the cost-optimal package can be established as the sum of the most profitable options for each element.

show abstract

“…A typical residential building, constructed between 1960 and 1990, consists of a single storey 3-bedroom house with masonry walls, located in Portugal. Rooms would be heated by electric heaters, whose nominal efficiency is 100%, while a gas heater with an average efficiency of 60% would be used for DhW [4], [5].…”

Section: Definition Of the Reference Buildingmentioning

confidence: 99%

A simplified method to select combined Energy systems

Tadeu¹,

Gonçalves²,

Simões³

et al. 2019

Int. J. EQ

Self Cite

View full text Add to dashboard Cite

The European Union aims to ensure that investment in energy efficiency measures is cost-effective. Thus, the minimum energy performance requirements of buildings must follow the so-called cost-optimal levels. It is known that the impact of a specific measure on the energy performance is affected by others measures when implemented simultaneously, influencing its profitability. for this reason, the profitability of a given package of measures cannot result from the simple sum of potential benefits of each measure. consequently, to define a cost-optimal solution it is needed to run a great amount of combinations, implying an expensive computational effort. In order to help with the selection of the energy systems, this work proposes a simplified method for selecting heating and domestic hot water systems as a function of the following variables: initial investment, maintenance cost, energy needs and cost, and efficiency of energy systems. The proposed method is user-friendly and can assist various stakeholders: policy makers, energy experts, suppliers of products and services and building owners.

show abstract

A sensitivity analysis of a cost optimality study on the energy retrofit of a single-family reference building in Portugal

Cited by 15 publications

References 26 publications

An Energy-Resilient Retrofit Methodology to Climate Change for Historic Districts. Application in the Mediterranean Area

An Energy-Resilient Retrofit Methodology to Climate Change for Historic Districts. Application in the Mediterranean Area

Procedure to select combined heating and hot water systems: An expeditious cost optimality approach

A simplified method to select combined Energy systems

Contact Info

Product

Resources

About