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design are described in Chapter 9. The results show that the CO2 turbomachinery is extremely compact. The currently estimated dimensions (without casing) are summarized in Table 10.8. The rotational speed of the turbomachinery is synchronized with the grid. For the 42oC compressor inlet temperature and 550oC turbine inlet temperature the cycle thermal efficiency would be 42.59% for the conservative turbomachinery efficiency and 44.02 for the best estimate turbomachinery efficiency. The net efficiencies would be 38.32% and 39.75 for the conservative and best estimate turbomachinery efficiencies, respectively. Since the compressor design code experienced convergence problems close to the critical point, the main compressor was designed at inlet temperature of 42°C, rather than the actual temperature of 32°C. Since these problems are of numerical nature it is expected that after they are resolved and the design at 32°C is accomplished that the efficiency of the main compressor will not change appreciably. Hence, the compressor efficiency at 32°C was taken the same as the efficiency at 42°C. But even at compressor inlet temperature of 42°C the net cycle efficiencies in this paragraph show that the cycle still exhibits a good performance. However, turbine inlet temperatures higher than 550oC would be required for the cycle to regain the potential that was demonstrated when 32oC compressor inlet temperature was used. Number of stages Maximum radius (m) Length (m) Total to total efficiency (%) 4 9 3 0.4 0.4 0.6 0.37 1.00 0.55 95.5 94.8 92.9 Table 10.8 Turbomachinery characteristics Main Recompressing compressor Compressor Turbine 235PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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