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are based on a constant value for the ratio of specific heats, Cp/Cv. For diffuser performance the NASA codes used Runstadler’s database of diffuser performance [Runstadler, 1969]. This database is one of the most thorough available, but it was determined that the data were not realistic for S-CO2. For Supercritical CO2 the ratio of specific heats and other properties change dramatically near the critical point, so Gong’s changes were focused on developing a set of polynomials for determining fluid properties for S-CO2 and implementing those subroutines within the existing NASA codes. He succeeded in producing a set of polynomials that run very efficiently for the range of fluid properties that is of interest to recompression cycles. Figure 3.5 shows Gong’s subroutines compared with REFPROP results. In the range of interest for the recompression cycle, Gong’s polynomials produce very good results and are able to do so quickly. 1000 900 800 700 600 500 400 1350 J/kgK : Gong 1350 J/kgK : NIST 1450 J/kgK : Gong 1450 J/kgK : NIST 1550 J/kgK : Gong 1550 J/kgK : NIST 300 325 350 375 400 Enthalpy (kJ/kg) 425 450 Figure 3.5: Fast-running fluid property subroutines for S-CO2 produced by Gong, as they compare to NIST REFPROP values. Density is plotted against enthalpy for three lines of constant entropy: 1350 J/kgK, 1450 J/kgK, and 1550 J/kgK as indicated in the legend to the right. Each entropy line has a value of enthalpy above which Gong’s subroutines are not applicable. It is evident in Figure 3.5 that both property subroutines have their limitations. At very low enthalpy, the REFPROP subroutines return errors, and at higher enthalpies, Gong’s subroutines deviate from the REFPROP subroutines. For recompression cycles, however, Gong’s subroutines perform well. Figure 3.6 shows the range of applicability for Gong’s subroutines. 51 Density (kg/m3)PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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