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Cooperational Project EHR

Title: Cooperational Project EHR - Exhausted Heat Recovery for on- and non-road vehicles; Subproject TU Dortmund: Simulation, design and prototype testing of expanders
Theme: Simulation, design and prototype testing of expanders
Promotion: Federal Ministry for Economic Affairs and Energy
Cooperation: Daimler AG, MTU Friedrichshafen and Lehrstuhl für Thermodynamik, Ruhr-Universität Bochum


Heat recovery of internal combustion engines has shown large potential for increasing efficiency and decreasing emission, respectively. Heat is transferred from exhaust gas to a coupled Organic-Rankine-Cycle in order to evaporate pressurized fluid. Subsequently this fluid passes an expansion machine emitting usable power, figure 1.

Part of the subproject is simulation based evaluation of different rotary displacement machines as well as design of a sample screw expander applied to exhaust heat recovery.

Thermodynamic simulation is used to determine geometric machine parameters and dimensions of the described specific application. This simulation, which is mainly based on conservation of mass and energy, allows calculating states of saturated and superheated steam within the expander´s working chamber.

Design process and prototype manufacturing are characterized by longtime experience of TU Dortmund Chair of Fluidics and excellent relations with SME. Subsequently experimental investigations are carried out on test rigs of the Chair of Fluidics and also on associated partner´s test rigs. The experimental research in Dortmund intends to analyze operational behavior and steam mass fraction at the expander´s outlet. In addition simulation approaches are validated by the received measurement data.




figure 1:
Exhaust heat recovery of internal combustion engines by means of a coupled organic Rankine cycle (ORC)



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Univ. Prof. Dr.-Ing. Andreas Brümmer
Tel.: 0231 755-5720
Dipl.-Ing. Manuel Grieb
Tel.: 0231 755-5727