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%. Therefore, likely levels of air impurities are expected to contribute negligibly to losses in cycle efficiency. 2.5 Chapter Summary The S-CO2 recompression cycle outperforms other cycles in efficiency terms if operated within certain temperature ranges. Its turbomachinery is markedly more compact, as evidenced in the compressor designs discussed next in Chapter 3. Test recompression cycles have not been built and further work is needed to model these systems. CYCLES III is designed to give accurate calculations for the operation of simple and recompression Brayton cycles at steady state. Its major improvements are the inclusion of the simple cycle and the ability to model fluid impurities, or cycles using any fluid. CYCLES III runs showed that a helium leak detection gas was detrimental to the efficiency of the S-CO2 cycle, causing a loss of 1.0 % efficiency at a helium mole fraction of 0.005. If leak detection capability can be proven effective in supercritical CO2 with a helium mole fraction of less than 0.005, then helium leak detection could be a very appealing feature of the recompression cycle. Air impurities are not as harmful to the cycle and can be tolerated at mole fractions up to 0.0035 with essentially zero loss in efficiency. Expected air impurities have no real effect on cycle efficiency. The ethane simple recuperative cycle shows little promise unless ethane cracking can be maintained at a low mole fraction. This is likely not possible at the high temperatures needed to produce an attractive efficiency. The rate of recombination, and the equilibrium concentration of different hydrocarbons are not known for an ethane cycle, though. Therefore, conclusions about the attractiveness of the cycle cannot be complete until more experimental data is available in the high pressure and high temperature ranges that would be necessary for a PCS. From analysis of the cycle performance with expected dissociation, however, the ethane recuperative cycle appears to have very little real promise. 41PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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