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3.5.2 The Recompressing Compressor Design The recompressing compressor was attempted as single-stage, two-stage, and three-stage designs. The best results were achievable for the two-stage design, in terms of both efficiency and operating range. The single-stage recompressing compressor design achieved undesirable efficiencies (79.8 %) and had a very small surge margin. This is attributable to excessive losses when the pressure ratio is too high for a lower density fluid. The lower density in the recompressing compressor means that a lower stage pressure ratio is needed. At the design point, the two-stage recompressing compressor achieves a total-to-static efficiency of 91.4 %. Figures 3.14 and 3.15 show the pressure ratio and efficiency of the two-stage recompressing compressor at various operating speeds. The inlet conditions of the recompressing compressor are far enough away from the critical point that, although compressing only 38 % of the flow, the recompressing compressor requires 57.0 MW at steady state, about 1.76 times the requirement of the main compressor, despite the fact that the recompressing compressor only receives 38% of the flow. 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 120% 110% 100% 90% 80% 70% Mass Flow Rate (kg/s) Figure 3.14: The pressure ratio of the recompressing compressor for varying speeds in percentage of the design speed (3600 RPM). The design mass flow rate is 989.6 kg/s. 75 Static-to-Static Pressure RatioPDF Image | Supercritical Carbon Dioxide Cycle Analysis
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