According to thermodynamic analysis of ORC system, the thermalproperties of the centrifugal turbine with R123 are presented inTable 2. The power output through the turbine shaft is 330 kW andthe mass flow rate is 12.4 kg/s, the design rotation speed is set to10000 rpm. A computer code has been developed to performaerodynamic design and analysis, based on which the key geometricparameters, efficiency and other parameters of the turbinehave been determined. Brief summaries of the main design principlesapplied were as follows: