Development Of A Supercritical Carbon Dioxide Brayton Cycle

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Development Of A Supercritical Carbon Dioxide Brayton Cycle ( development-of-supercritical-carbon-dioxide-brayton-cycle )

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1.04 1.03 1.02 1.01 1.00 0.99 0.98 700 800 900 1000 1100 1200 1300 Temperature (K) Comparision of Compressibility Factor NIST Data Base 1 MPa - NIST Data Base 10 MPa - NIST Data Base Figure 2-4. Compressibility factor of CO2. A comparison of RELAP5/ATHENA [INEEL, 2005] code-calculated values with an independent source of data [Perry 1984] was made. The comparison concentrated on the sub-critical gas and supercritical regions since these regions are of primary interest for analysis of gas-cooled fast reactors. Thermodynamic properties were compared for a wide range of pressures, from 0.8 to 20.7 MPa, and temperatures, from 227 to 1255 K. ATHENA calculations were performed at five specific pressure points and over the temperature range given by Perry. The comparisons between the values calculated by ATHENA and given by Perry are summarized in Figures 2-5 and 2-6, which show fluid density and specific enthalpy, respectively. A constant of 218.57 kJ/kg was subtracted from the enthalpy values reported by Perry to account for a different enthalpy datum. This value was obtained by subtracting the enthalpy predicted by the NIST database for saturated liquid at 0C from the value used by Perry. 200 150 100 50 0 0 50 100 150 200 Reported density (kg/m3) Figure 2-5. A comparison of calculated and reported fluid densities. 0.8 MPa 3.6 MPa 8.3 MPa 12.4 MPa 20.7 MPa Y=X 7 Compressibility Factor Calculated density (kg/m3)

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