Integrating hourly life-cycle energy and carbon emissions of energy supply in buildings

Vuarnoz, Didier; Cozza, Stefano; Jusselme, Thomas; Magnin, Gabriel; Schafer, Thibaut M.; Couty, Philippe; Niederhäuser, Elena‐Lavinia

doi:10.1016/j.scs.2018.08.026

Cited by 27 publications

(13 citation statements)

References 29 publications

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“…Zhang and colleagues (2017) found that the dynamic price load shifting strategy has a similar performance than the conventional operational strategy when electricity price variation is not large enough. Vuarnoz et al (2018) tested other single objective optimizations; they also demonstrated performances similar to those obtained with a traditional EMS when optimization concerns primary energy. When optimization is made for GHG emissions, the very limited gains are obtained at the detriment of the primary energy (Vuarnoz et al 2018).…”

Section: Introductionmentioning

confidence: 77%

“…Vuarnoz et al (2018) tested other single objective optimizations; they also demonstrated performances similar to those obtained with a traditional EMS when optimization concerns primary energy. When optimization is made for GHG emissions, the very limited gains are obtained at the detriment of the primary energy (Vuarnoz et al 2018). A combination of operation strategies was identified by Zhang et al (2017), and the results obtained outperformed other single optimization strategies (traditional and dynamic price load shifting).…”

Section: Introductionmentioning

confidence: 77%

“…A versatile modelling framework previously developed (See Vuarnoz et al 2018) is used to simulate the running conditions of the BES at the hourly time-step and to assess its annual performance according to Swiss standard SIA 2040 (2017). The choice of the hourly time-step allows us to take into account the dynamic interaction within the components of the building energy system.…”

Section: Modelling Frameworkmentioning

confidence: 99%

“…Among the possible EMS, the most common is referred to as the 'traditional' strategy and prioritizes the self-consumption of on-site RE (see e.g. Zhang et al 2017;Vuarnoz et al 2018). The minimization of cost is achieved by different computational approaches, for example, convex programming (Wu et al 2017), mixed-integer linear programming (Doroudchi et al 2015), and adaptative dynamic programming (Huang and Liu 2011).…”

Section: Introductionmentioning

confidence: 99%

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Assessing the required life-cycle characteristics of electricity storage for ensuring sustainability in buildings

Vuarnoz

2020

Architectural Science Review

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In high-performance buildings, energy storage is a key component in increasing self-consumption of onsite renewable energy, but is also responsible for extra embedded burdens. The main risk is not paying back these extra burdens through operational benefits during the use phase of the building. The aim of this study is to define, explore and propose a methodology for assessing the limits of the viability of energy storage systems when embedded in a building, utilising a set of indicators including greenhouse gas emissions, primary energy and costs. These values are therefore of importance when designing a building energy system integrating renewable energy source and energy storage. Beyond the results obtained for a case study in Switzerland, the study unveils different mechanisms according to the scheme of renewable energy exports. Results are greatly affected by the geographic context and demonstrate the necessity to implement harvesting systems providing low-impact renewable energy in buildings.

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Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 77%

Section: Modelling Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessing the required life-cycle characteristics of electricity storage for ensuring sustainability in buildings

Vuarnoz

2020

Architectural Science Review

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“…A possible architectural layout (cuboid of 22 Â 29 Â 23 m) provides the basis for an hourly energy assessment of the building (see Ref. [37] for more detailed information), performed with the energiePlus software [38]. The use of a heat pump is considered for space heating and for providing the domestic hot water (DHW).…”

Section: Countrymentioning

confidence: 99%

Temporal variations in the primary energy use and greenhouse gas emissions of electricity provided by the Swiss grid

Vuarnoz

Jusselme

2018

Energy

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It is a frequent practice nowadays to use mean annual conversion factors (CFs) when performing lifecycle assessment (LCA) of processes and products that use electricity supplied by the grid. In this paper, we conduct an hourly assessment of the greenhouse gas (GHG) emission factor, along with the conversion factors for the cumulative energy demand (CED) and its non-renewable part (CEDnr), of electricity supplied by the Swiss grid and its direct neighboring countries (France, Germany, and Austria; Italy being neglected). Based on an hourly inventory of energy flows during a one-year period (2015 e2016), this attributional approach allows performance of various certification procedures of process or product manufacturing, and comparison of energy and carbon intensities of different national mixes. Hourly calculation allows evaluation of the order of magnitude of errors made when considering an annual mix. Visualization techniques are used to better understand the obtained data and to detect when strategies involving timing optimization of electricity use may be efficient. A case study is chosen to illustrate the relevance of hourly CFs when performing LCA associated to the exploitation of a given building. Moreover, mean annual CFs of interest are discriminated by electricity end-use sectors. This could be of great help for system designers willing to improve the assessment accuracy when hourly CFs are not readily available.

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Evaluating climate change pathways through a building's lifecycle based on Dynamic Life Cycle Assessment

Negishi

Lebert

Almeida

et al. 2019

Building and Environment

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Integrating hourly life-cycle energy and carbon emissions of energy supply in buildings

Cited by 27 publications

References 29 publications

Assessing the required life-cycle characteristics of electricity storage for ensuring sustainability in buildings

Assessing the required life-cycle characteristics of electricity storage for ensuring sustainability in buildings

Temporal variations in the primary energy use and greenhouse gas emissions of electricity provided by the Swiss grid

Evaluating climate change pathways through a building's lifecycle based on Dynamic Life Cycle Assessment

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