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0 !ifluid This is the first fluid, 0-CO2, 1-Ethane, 2-Helium 1 !mix IDs if there is a 2nd fluid, 0-pure, 1-2nd fluid exists 2 !ifltwo IDs 2nd fluid, 0-He, 1-Air,2-Hydrogen,3-Nitrogen,4-Methane 0.010d0 !fracgas This is the mole fraction of the 2nd fluid(if applicable) The inputs listed above would correspond to the mixture shown in Figure 2.6b. Air is included in CYCLES III as a mixture of 78.12 % N2, 20.96 % O2, and 0.92 % Ar by mole fraction, as approximated in NIST’s REFPROP program. The computing time required to develop tables is much longer for mixtures, but it is necessary because the effect of impurities can be substantial, as discussed in Section 2.4. The user could choose to modify the code and change the available NIST fluids, simply by changing the reference fluid property file called by CYCLES III. This is discussed in Appendix A. The ability to model the cycle with other fluids is especially useful in the simple cycle, because the simple cycle has been used in many industries, with several different working fluids. Research into new power cycles can take advantage of this capability, as discussed further in Section 2.3. 2.2.5 Interfacing with TSCYCO The Transient S-CO2 Cycles Code (TSCYCO) is Tri Trinh’s updated version of Shih Ping Kao’s S-CO2 Power Systems (SCPS) code [Trinh, 2009], [Kao, 1984]. TSCYCO performs transient analysis of the S-CO2 recompression cycle for several different transients based on energy, mass, and momentum conservation laws. Its function is very different from that of CYCLES III, but it does require information about the structure of the piping that is in a different format than CYCLES III. The headers in TSCYCO are modeled as single equivalent pipes, one for each of the twelve paths in Figure 2-5. The required dimensions are: The total internal volume of the header The thickness of the equivalent pipe The length and diameter of the header The total heat transfer area of the header Because each path in Figure 2.5 has a single header in TSCYCO, CYCLES III lumps all the passages in each of the twelve paths into one header, preserving total volume of steel, total internal volume, and pressure drop. Because transient effects depend on mass flow rates, and therefore accumulations of mass, the volumes of the headers are important. These are preserved from CYCLES III in a rough approximation based on the hydraulic diameter of each passage in 32PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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