Analysis of Radial Compressor Options for Supercritical CO2 Power

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The result gives unacceptable efficiency with a very large impeller. The diameter of the impeller is slightly over 1.5m, which gives an overall size of the radial compressor (including impeller, diffuser, and scroll) of 3m. As the cycle power increases, the efficiency can also be improved. Fig. 3.4 shows the efficiency of the recompression compressor (using a single stage design) for different cycle powers. The results show that the efficiency will not exceed 80% unless the cycle power is much higher. Another way to improve the efficiency is to use a two or three stage design. 0.78 0.76 0.74 0.72 0.7 0.68 0.66 100 150 200 250 Cycle Power [MW] 400 450 300 350 Fig. 3.4 The Impact of Cycle Power on the Efficiency of the Recompression Compressor 3.4.2 Two-Stage Design Since the pressure rise in each stage is reduced, the specific speed increases. If the pressure rise is evenly distributed between two stages, the key design parameters and performance can be calculated; the results are listed in Table 3.8. 20 Efficiency

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