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\section{Introduction}  In the context of the energy transition, energy efficiency and renewable energy resources integration are the main challenges. According to the energy technology perspective report of the International Energy Agency \cite{2014}, it corresponds to more then 65\% of the contribution to the $CO_2$ mitigation effort needed to limit the temperature increase to 2°C. The research community is today proposing This leads to  a tremendous number considerable effort  of the research community to propose  new advances for the energy usage and  conversion using bio-chemical, thermo-chemical or photo-chemical or physical concepts. For the engineers who will be responsible of designing the future energy system, the goal is therefore, on the one hand, the integration of the today to integrate these new  technologies development and, on in  the other hand, energy system and to create innovative new smart multi-energy infrastructures that will allow  the generation penetration  of practical systems that are operated these technologies and to operate them  with a maximum of efficiency. The role of the process and energy system design is to calculate the equipments to be considered to supply the products and the services required by the community (being a household, a district, a city or a country). This means defining the most attractive technologies to be used and their sizes, corresponding sizes and location,  the way they are interconnected and the way they will be operated. operated over their life time. It is also important to consider how they will be manufactured and dismantled or recycled at the end of their lifetime.  The systems have therefore  to be assessed with respect to different criteria like thermodynamic, economic or environmental. They have also to be assessed considering not only the existing technologies but also to show the potential role of the future technologies. It comes from this analysis a definition of the possible role of the energy policy as well as of the need for infrastructure development in particular considering the multi-energy  networks like electrical, gas or heat and information. For the engineers and the policy makers policymakers  it is therefore important to define in a systematic way the most important competing system design  scenarios and to define in a comprehensive way the performance indicators that will allow to compare them.