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21st Aachen Colloquium Automobile and Engine Technology 2012 9 at B-speed from engine characteristic map) and 100% of the engine load the turbine delivers a power up to 16 kW. The required power for the fluid pump of approximately 0.3 kW is not subtracted. This corresponds to approx. 5% of the engine power with a turbine efficiency of approx. 68%. 30.0 25.0 20.0 15.0 10.0 5.0 0.0 Fig. 8: Calculated power of the turbine with water as working fluid Isentropic Power A100 B25 B50 Engine Operating Point Thermal Power B75 B100 Expander Power Output The model also allows the calculation of efficiencies. For the calculation a simplified model was utilized. It does not consider the spatial flow at inlet and outlet of the turbine as well as the rotor lateral flow. Furthermore all boundaries are assumed as adiabatic and ideally smooth. In Fig. 9 the course of efficiency for different stationary engine operating points is shown. At the operating point B50 the relevant operation speed is between 110,000 rpm and 150,000 rpm. In this speed range the efficiency for B25 decreases significantly. At the other operating points of the engine a high efficiency is visible in the aforementioned speed range, cf. Fig. 9. 4.7 2.1 1.8 5.8 Power [kW] 11.2 6.9 10.8 10.1 19.6 12.8 18.1 11.9 19.1 16.1 28.2PDF Image | Waste Heat Recovery for Commercial Vehicles with a Rankine Process
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