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B.4 Fluid Properties The critical velocity database developed for CO2 by Gong could be produced for any other fluid, allowing the operation of RGRC for any gas. The database is produced by successive iteration of velocity and enthalpy until convergence is achieved. By choosing a total enthalpy and then increasing velocity, the database can be produced. The steps are: 1. Choose an entropy value 2. Begin at a total enthalpy value 3. Increase velocity and calculate static enthalpy 4. Find the speed of sound and compare to the velocity 5. If the velocity is equal to the static enthalpyβs speed of sound it is the critical velocity for the present value of total enthalpy. If not, increase velocity again. Gongβs polynomials operate by using coefficients which have been fit to the NIST data in the range of interest. These coefficients are contained in the file co2p4s.dat. Fluid properties, in this example the pressure, are then calculated as polynomial functions of the enthalpy by 5 π=1 where polyc is a vector of five coefficients which are interpolated between 67 values of entropy. Therefore, each fluid property is determined from enthalpy and entropy. These polynomial fluid property subroutines are contained in the file property.f90. To use the NIST subroutines, property.f90 can be replaced with nist_property.f90. The subroutines are all named the same, so the rest of the code will run exactly as it had with the Gong polynomials. RGRC will return a warning when Gongβs polynomials are approaching the unreliable region. The user should not automatically discard any compressor map for which some points return this error. It is likely that the error will be returned in the choke or surge region and therefore the entire operating range will have been produced with valid property subroutines. B.5 Conclusion Compromise will govern the design of any compressor stage, with a careful regard for the aspects of the compressor performance which are most important for its application. Determining whether or not a centrifugal compressor is practical for a particular application is the first step. Based on the non-dimensional specific speed, applications for centrifugal π = ππππ¦π(π) π» 5βπ Eqn. B-1 141PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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