A method of operating a system for a thermodynamic cycle, control means for a system for a thermodynamic cycle process, system, and assembly of an internal combustion engine and a system

The invention relates to a method of operating a system (5) for a thermodynamic cycle process, an evaporator (7), a condenser (11) and an expansion means (8), wherein the expansion device (8) - in the direction of flow of a working medium of the thermodynamic seen cyclic process - between the evaporator (7) and the condenser (11) is arranged, comprising the steps of: detecting at least one operating parameter of the system (5) and adjusting a rotational speed of the expander (8) to a value at which (the expansion device 8) has a maximum power output at the detected operating parameters.