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1000 750 500 250 0 300 325 350 375 400 Enthalpy (kJ/kg) 425 450 Figure 3.6: Range of Applicability for Gong’s S-CO2 property subroutines Figure 3-5 shows the density as a function of enthalpy for three lines of constant entropy. By drawing a line through the points where the property routines diverge, an expression for the range of validity for Gong’s subroutines was developed. If the density at the impeller outlet falls outside the range bounded by the two lines in Figure 3.6, RGRC will return a warning to the user that the fluid property subroutines cannot be trusted in that range. On the whole, Gong’s fluid property subroutines are quite successful. They reduce the computing time for many calculations by orders of magnitude. Subroutines calling Gong’s polynomials were substituted for the calculations already present in CCD and CCODP. In principle, these changes should have been enough to produce basic compressor designs and performance maps. The structure of the code and its variable naming scheme were left unchanged by Gong. CCD and CCODP are written in Fortran 77, using almost no subroutines and scores of GO TO statements. The code is very difficult to understand for these and other reasons. Furthermore, there were large disagreements between the design code and the off-design code when run on CO2. Part of the problem was inconsistency in Gong’s application of his new property subroutines. The performance maps did not agree with the design code, sometimes showing as much as 20% difference in the stage pressure ratio for the design point. An example of the discrepancies is shown in Figure 3.7. The pressure ratio graph shows a vertical surge line, a feature never observed in real compressors. The effect is produced by CCODS because no surge criterion has been met. Instead, the surge line in Figure 3.7 only serves to indicate the mass flow rate at which calculations begin. 52 Density (kg/m3)PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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