XRG Simulation GmbH - Simulation and Modelling. XRG Simulation is a small and medium German enterprise which performs computational simulations with state-of-the-art software in order to develop superior quality products. XRG is focused on thermal energy systems simulation to support international companies and research institutions in the research, development and improvement of projects and products. In highly qualified teams comprising engineers, mathematicians and physicists, XRG Simulation carries out complex system simulations using numerical methods. With the simulation and modelling of technical energy problems, we proceed in a strategic, unbiased and unbureaucratic manner and have above-average requirements in terms of the quality of our work. XRG is in close contact with organizations and continuously takes part in joint research projects with well-known universities and institutions. With this scientific foundation a high value knowledge transfer can be offered and a continuously growing know-how. Consequently, XRG Simulation has established itself as a reliable and flexible partner of international corporations and institutions.