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4 D.Maksiuta, L.Moroz, M.Burlaka, Y.Govorushenko / Energy Procedia 00 (2017) 000–000 standard approach of the enthalpy drop distribution between stages obviously can’t be applied for designing ROT, since the geometrical parameters of turbine stages have significant differences from the first stage to the last one. Nozzle Blade Nozzle Blade ab Fig. 2. h-s diagram of the working fluid expansion when turbine is designed using standard design approach (a) and using proposed design technique (b). 3. Preliminary Design and Selection Process of the Different Turbine Types To perform a comparative analysis of a different turbine designs proposed in [3] 3 MW WHR ORC for the combustion engine CAT G3612 [7] has been chosen. The cycle consists of 6 heat exchangers; 2 turbines: high pressure (HPT) and low pressure (LPT); 2 pumps: high pressure (HPP) and low pressure (LPP); and the condenser (fig. 3). Working fluid expands in the HPT up to the pressure of the LP loop (7 bars). After that the flows from the different loops mix and expand in the shared LPT. This means that the mass flow through the LPT is equal to the sum of the HP and LP flows. Flows are again split at the condenser outlet. Boundary conditions for the turbines design are presented in table 1. Operational range of the HPT is in supercritical region, while the LPT would be operating under subcritical conditions. Table 1. Boundary conditions for turbine designs Parameter Inlet total pressure Inlet total enthalpy Static pressure at outlet Static enthalpy at outlet Mass flow rate Unit HPT bar 45.00 kJ/kg 621.87 bar 7.000 kJ/kg 569.26 kg/s 5.249 LPT 7.000 515.63 1.300 480.18 11.77 In proposed cycle [3] R245fa (pentafluoropropane) organic fluid was used as the working fluid. Fluid properties were calculated based on the NIST REFPROP library [8].PDF Image | radial-outflow turbine type for 3 MW WHR organic Rankine cycle
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