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can easily transfer knowledge and experience between the two. Choosing the simple cycle or the recompression cycle is as easy as changing the value of itype in the input file HXdata.txt. The simple cycle can be used to model typical helium Brayton cycles. Investigation will show that a simple cycle will run with S-CO2, but cycle efficiencies will be too low to ever be viable in industrial use. 2.2.4 Inclusion of other NIST Fluids The most drastic change in CYCLES III, in terms of functionality, is the ability to model the cycle with any NIST fluid and mixtures of NIST fluids. CYCLES III determines fluid properties from highly developed polynomials, available from the National Institute of Standards and Technology (NIST). These polynomials are available through Fortran subroutines, but can be slow to use if many calculations are needed [NIST, 2007]. To speed up calculations, CYCLES has always included the ability to develop tabulated fluid properties from these polynomials. Once the tables are complete, the code can run much faster, however, the original table creation subroutines were written only for pure fluids. It is certain that no working fluid can be entirely pure, and that impurities will change the critical point of the mixture. Figure 2.7 shows the effect of a few impurities on the critical point of CO2. The critical point can be identified by the spike in heat capacity at constant pressure. 30PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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