Traditionally, the different energy sectors, such as electricity and heat, are planned and operated separately and independently from each other. In the 1990s, electricity generation in Europe was dominated by conventional fuel sources like coal and oil, followed by gas. Due to the eventual depletion of those sources, and to escape from the dependence on them, renewable energy technology was promoted and brought into the energy mix. With the progress in decarbonizing the electricity sector, the importance of decarbonizing other energy sectors, like heat and transport, increased. Sector coupling is introduced as a new energy paradigm in order to curb climate change and overcome its vagaries. Modernized energy networks are considered as highly complex systems and as a result, modelling and simulation of energy systems has become invaluable and fundamental for their development and implementation. A simulation model is often a replication of a real life system, therefore a model is abstract by nature. Implementing a model then using it without validation may cast wrongful solutions due to improper assumptions. This thesis identifies a validation scheme for open source multi-energy vector simulation tools.