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This study presents an optimized modelling approach for the radial inflow turbine where the input parameters are optimized to deliver a turbine with superior performance. In order to predict the performance (off-design) of the optimized turbine under steady state conditions, the geometry of the turbine is imported into a commercial turbomachinery simulation software (Rital) [16] where these results can be calculated. This off-design model can be used in the first stage of the design process to decide whether a certain approach is delivering the expected results before moving to the detail design of the CFD. Furthermore, the impact of the optimized radial inflow expander on the ORC system for an off-highway vehicle is presented using two working fluids, R245fa and R123. To achieve this, an integrated in-house model has been developed which includes the engine map operating points from a heavy duty diesel engine, the ORC model and the proposed radial expander model. In order to evaluate the potential benefit of the ORC system on diesel engine fuel consumption, brake power and NOx emissions, the model was employed at various engine load and speed operating points. 2. Powertrain Modelling Approach The proposed integrated powertrain model is schematically presented in Figure 1. Figure 1: (Left) Schematic Representation of the ORC Powertrain; (Right) Schematic representation of the ORC cycle The model integrates the exhaust thermodynamic conditions predicted by the engine simulation and the ORC modelling which are both presented below in more detail. The powertrain 3PDF Image | Off Hwy Vehicle Radial Turbine Expander Design WHR ORC
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