Multistage ORC cycle with Zwischenenthitzung

The invention relates to the optimum use of two heat sources with different amount of heat and temperature such as in the engine exhaust heat and exhaust heat of internal combustion engines by ORC flow and piston machines, such that the vaporous ORC working fluid with strongly inclined to the right saturated vapor line in Ph -diagram is expanded in at least two steps and is carried out in such a manner between at least two steps, a desuperheating of the ORC working fluid, that the Enthitzungswarme is supplied to the liquid ORC working fluid in a preheater in a II situated above the engine waste heat temperature range.