Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility

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Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility ( development-supercritical-carbon-dioxide-brayton-cycle-impro )

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Figure 13. HYSYS Schematic for a supercritical CO2 cycle with 49.3% efficiency. The preliminary results of the pressure effect on the cycle efficiency and the size of the recuperator using a supercritical CO2 cycle, indirect 3-shaft arrangement are presented in Table 3. Table 3. Results of the pressure effect on the efficiency. Pressure in PCS 6.3 MPa 13 MPa 20 MPa Mass flow rate (kg/s) 700 625 560 UA value for recuperator (kJ/C- hr) 2.7095e7 1.885e7 1.507e7 Cycle efficiency 48% 49.3% 50.3% where UA is universal heat transfer coefficient times heat transfer area. In order to maintain an effectiveness factor of 95% for the recuperator, the following calculation was implemented into the HYSYS simulation: The effectiveness of a heat exchanger is defined as the ratio of the actual heat transfer rate to the maximum heat transfer rate. q (3) q max qmax Cmin (Th,i Tc,i ) (4) here Cmin is either Ccold or Chot, whichever is smaller. Ccold cp,cold m cold (5) 11

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