Life Cycle Assessment

Life Cycle Assessment

The goal of a life cycle assessment (LCA5) for a ZEB, is to quantify the GHG emissions of the building, using environmental information, based on the defined scope and intended use of the assessment.

A functional unit is a common reference unit, used to present the results of an environmental assessment, related to the technical characteristics and functionalities of a building.

The basis for this functional unit is rooted in the commonly used metric of reporting energy use in terms of kWh per m2 of heated floor area (BRA) per year. This definition of a functional unit facilitates for the comparison and balance of operational energy and embodied material emissions against on-site energy production.

Alongside the functional unit, it is also required to state total embodied emissions (kgCO2eq) of the building. It has become good practice to tabulate embodied emission results according to building component and life cycle module, see below table.

The system boundary describes the scope of the assessment and determines the processes that are taken into consideration during the life cycle assessment

Different stages of the life cycle of a building, as defined in EN 15978: 2011