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Tag: Lifecycle stage: B6

B-24 Dynamic LCA data for assessing the impact of electricity consumption

Written on 21. October 2012.

*Aspect*		B-24 Dynamic LCA data for assessing the impact of electricity consumption
*Description*		Energy sources for electricity production may vary significantly according to the season (winter or summer months), the day (weekdays, weekends) and the time within a day. Environmental impacts are strongly influenced by the decision to use annual energy data (i.e. average LCA data) or energy data based on a shorter period (monthly, daily or hourly).
*related study objective*		☒ stand-alone LCA		☒ comparative assertion
*related study phase*		☐	☒	☐	☐	☐
		goal and scope definition	inventory analysis (LCI)	impact assessment (LCIA)	interpretation	reporting
*relevant for*
	new buildings	existing buildings	construction products	screening LCA	simplified LCA	complete LCA
*Provisions*	Annual average datasets for electricity production should be used in the baseline scenario. Deviating data can be analysed in additional scenarios with transparent documentation and a sensitivity analysis.
*Rules from:*	*EN 15978*: Not mentioned
*Guidance*	Dynamic LCA data can be produced by using the hourly data provided by electricity suppliers in each national context. For example, in France, RTE provides hourly data, broken down by source: fossil, hydropower or nuclear energy Based on these proportions, and LCI/LCIA data corresponding to each energy source, dynamic LCA data can be calculated. (Note: the LCI/LCIA data statically aggregate elementary flows.) Such dynamic LCA data can also be linked to models to predict the environmental impacts in a dynamic way (although very few LCA tools for buildings currently provide such assessment). More detailed information on this aspect can be found e.g. in a French PhD thesis by G. Herfray [Herfray 2011] or in [LoRe-LCA 2011]

B- 19. “Operational Energy exported and on-site produced and allocation of environmental impacts”

Written on 17. October 2012.

*Aspect*		B- 19. “Operational Energy exported and on-site produced and allocation of environmental impacts”In future, buildings will not only be energy- efficient, but also will produce energy on site in multiple ways.
*Description*		The energy produced at the building site may not only be consumed in the building, but also exported to the grid. For such cases, calculation and allocation rules need to be defined.
*related study objective*		☒ stand-alone LCA		☒ comparative assertion
*related study phase*		☒	☐	☐	☐	☐
		goal and scope definition	inventory analysis (LCI)	impact assessment (LCIA)	interpretation	reporting
*relevant for*
	new buildings	existing buildings	construction products	screening LCA	simplified LCA	complete LCA
*Provisions*	Impacts have to be calculated with regards to EN 15978, in Annex B case studies of different energy related questions are provided.
*Rules from:*	*EN 15978:8.6.5 Scenarios for operational energy use – Module B6Annex B (informative) Exported energy – Case studiesCase 1 (Scenario for energy use, supply and import) Case 2 (Scenario for energy use and export) Case 3 (scenario for energy use, supply and export) Case 4 (scenario for energy export) EN 15804:* Not mentioned *ILCD*: Not mentioned
*Guidance*	The case studies in Annex B of EN 15978 are helpful to identify the situation that applies to a concrete case study. From these case studies, the treatment of the situation may be extracted.

Back to 5.7. Module B6

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