Device and method for operating a thermodynamic cycle

A method for operating a thermodynamic cycle, the method during normal operation comprising the following steps:

• conveying liquid working medium to an evaporator by increasing a pressure by a feed pump;
• evaporating the liquid working medium by supplying heat in the evaporator;
• expanding the evaporated working medium in an expansion machine;
• condensing the expanded working medium with at least two condensers connected in parallel between the expansion machine and the feed pump,
• wherein during a start-up operation carried out before normal operation, the method further comprises:
• providing a sufficient positive suction head of liquid working medium in front of the feed pump in order to prevent cavitation in the feed pump;
• starting the thermodynamic cycle with one of the least two condensers, in which a lowest condensation pressure is present;
• and
• switching on remaining ones of the at least two condensers in the order of increasing condensation pressure.