System with organic Rankine cycle circulation for driving at least one expansion device, heat exchanger for driving the expansion device and method for operating at least one expansion device

摘要

The system has a cycle for cooling an internal combustion engine (2) for a motor vehicle. An exhaust gas heat exchanger (31) is provided for the internal combustion engine waste heat utilization. An organic rankine-cylce (9) drives an expansion machine and for flow with a heat exchanger medium. The organic rankine-cylce has a preheat exchanger stage (21), which preheats and/or evaporates the heat exchange medium, where another preheat exchanger (22) evaporates and/or over heats the heat exchange medium, where a cooling agent flows through the two preheat exchanger stages. An independent claim is also included for a method for operating an expansion machine of an organic-rankine cycle process.