The Propulsion and Aerothermodynamics Division of the European Space Agency has chosen EcosimPro for propulsion system study projects. A line of work has been developed with the European space industry in order to create a propulsion components library valid for all. The scope of the library, its components, physical phenomena to be modelled, etc. will be defined in the coming months. At present there is an initial library called PROPSAT, which contains some of the basic components: heat exchangers, valves, tanks, etc.