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assumption is made that they reduce the net specific work by 2% of its value. The accurate determination of this value for each design will be the subject of future work. Reducing the net specific work by the mechanical losses and the parasitic loss yields the generator shaft specific work. The generator efficiency reduces the value of the generator shaft specific work by 2%. This reduced generator shaft specific work is further reduced by the losses in the switchyard, which are assumed to be 0.5% in this work. The pre-cooler pumping power was calculated to be 1.6 MW; dividing this value by the mass flow rate of CO2 one obtains the specific pump work for the pre-cooler, which can be subtracted from the specific work in the switchyard. This finally gives the gross specific power. Table 10.5 Overall heat balance for the reference design Heat added (kJ/kg) Heat rejected (kJ/kg) Work of turbine (kJ/kg) Work of main compressor (kJ/kg) Work of recompressing compressor (kJ/kg) Total work of compressors (kJ/kg) Net specific work (kJ/kg) Thermal efficiency (%) Mechanical losses (kJ/kg) Parasitic losses (kJ/kg) (calculated from net specific work) Generator shaft specific work (kJ/kg) Generator losses (kJ/kg) Switchyard losses (kJ/kg) Precooler pump work (kJ/kg) Gross specific work (kJ/kg) Gross efficiency (%) Additional house load (kJ/kg) Net station efficiency (%) Mass flow rate (kg/s) Thermal power (MW) Net electric power (MWe) 188.89 103.38 120.80 12.38 22.91 35.29 85.51 45.27 1.34 1.71 82.46 1.65 0.40 0.51 79.90 42.30 2.46 41.00 3176.40 600.00 246.00 The last step is to account for additional station loads. Since a supercritical CO2 has not been built and a detailed design is not available either, one has to guess what the additional station loads will be. Since the cycle is very simple it is reasonable to expect 231PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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