Exploration tooL for Sustainable Architecture (ELSA)

In order to embrace carbon and energy parameters from the early stages of project, the research group has settled a design assistance tool called ELSA.
On the basis of an architectural intention, it enables the designers to manage a limited “carbon and energy budget”, enforced for the building’s construction.
The tool uses a database of several thousands of conception alternatives, with their respective performances, allowing an early integration of environmental specifications in the design process.
Throughout the project’s materialization decisions, the incompatible options are eliminated, guiding the designer through his successive choices.

To face climate change, GHG emission targets will be set worldwide for the built environment, one of its major contributors. As a result, Life-Cycle Assessment (LCA) will become an important driver in the building design stakeholders’ decisions, for increasing the operating performance while minimizing embodied impacts. However, the integration of LCA to the design process adds a high degree of complexity (05-B3). In addition, it allows assessing the environmental performance but does not help finding design alternatives. New techniques such as design solutions exploration methods are promising tools to understand general performance trends, and to increase the usability of the results,but have not been applied to LCA so far. One of the challenges to face is that – due to the high number of parameters involved in GHG emission assessment in buildings – it is currently impossible to investigate all the design solutions in a reasonable computational time.

Adopted approach for the SLB research program on early stage LCA
A unique exploration method enabling to integrate lifecycle performance at early design stages has been developed through this research program and translated into an operating prototype named ELSA, which stands for Exploration tooL for Sustainable Architecture (elsa.epfl.ch).
This was made possible through an original combination of different techniques, developed towards this end: a variation of analytical target cascading methodology, which needed to be adapted to the building scale (01-D), parametric simulations (05-B4) and sensitivity analyses (05-B6). The proposed approach aims to appraise design alternatives instantaneously by highlighting the environmental consequences of architectural choices using specific data visualization techniques (05-B7).

For further details, see publications below

click to enlarge



Human-IST, University of Fribourg

T. Jusselme; A. Brambilla; V. Costa Grisel; S. Cozza; E. Hoxha et al. : Smart Living Building Research Program - Executive Summary. 2017.
T. Jusselme; S. Cozza; E. Hoxha; A. Brambilla; F. Evequoz et al. : Towards a pre-design method for low carbon architectural strategies. 2016. PLEA2016, Los Angeles, USA, July 11-13, 2016.
A. Poncety; A. Brambilla; E. Hoxha; D. Vuarnoz; S. Cozza et al. : Graphical representation of the smart living building research program ; Building2050 Scientific Workshop, Gruyères, Switzerland, October 2016.
E. Hoxha; T. Jusselme; A. Brambilla; S. Cozza; M. Andersen et al. : Impact targets as guidelines towards low carbon buildings: Preliminary concept. 2016. PLEA, Los Angeles, USA, July 11-13, 2016.


State of Fribourg – Switzerland