Considering temporal variation in the life cycle assessment of buildings, application to electricity consumption and production

Abstract : Existing tool for environmental impact assessment of buildings and districts according to the LCA procedure are based upon a static method, considering yearly average processes and impacts. A dynamic method has been developed in order to model the temporal variation of electricity production and allocate environmental impacts to different uses. It allows to evaluate low-energy and plus energy buildings on a more precise basis. Based upon data from the French electricity grid manager, the model evaluates the production mix in terms of temperatures in French climates and several periodic functions corresponding to variation frequencies identified by a Fourier analysis. In a second step, specific production mixes are derived for different uses: heating, cooling, domestic hot water, domestic appliances and office appliances. The model has been tested on a single family passive house, allowing solar hot water and photovoltaic systems to be assessed using a dynamic method. Dynamic Life-cycle Assessment, Buildings, Electricity production, consequential life cycle assessment Introduction In France in 2011 almost 60% of the total electricity production was consumed in buildings [1]. 33% of dwellings and 25% of office buildings are heated by electricity [2] and more than 45% of dwellings also use electricity to produce hot water [2]. This consumption is highly time-dependent, from summer to winter, from day to night and from week to weekends. Production of electricity follows this variability. For instance, electric heating induces a seasonal peak demand in winter with a high dependency to temperature, which is increasing every year [1]. Local production of electricity, such as photovoltaic panels on buildings roofs, also has a time-dependent production.
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Charlotte Roux, Bruno Peuportier. Considering temporal variation in the life cycle assessment of buildings, application to electricity consumption and production. SB 14 Barcelona, Oct 2014, Barcelone, Spain. ⟨hal-01459975⟩

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