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Narrative Task 1. Development of CO2 Brayton Cycle Task 1-1 Development of the efficiency equation of turbine and compressor for the real gas The objective of this task involves mathematical derivations of the turbine and compressor efficiency. When supercritical CO2 gas is expanded and compressed in a real gas fashion through a sequence of turbines and compressors, the isentropic formulas shown in most thermodynamic books are no longer useful. Task technical status overview: As reported in the first annual report the following tasks were already accomplished through the end of September 2002. Theoretical equations for polytropic expansion and compression were developed in this task for scoping analyses in Year 1. Task 1-2 Comparison of supercritical CO2 properties with equations of state The objective of this task involves checking thermal and transport properties of CO2 gas between references (Reid et al., 1977, Reid et a., 1987, Rivken, 1988, and Perry et al., 1997) and a number of equations of state (EOS) in the Aspen Plus (Aspentech, 2001) and HYSYS codes (Aspentech, 2001). Task technical status overview: As reported in the first annual report the following tasks were already accomplished through the end of September 2002. Thermal and transport properties of CO2 were compared and we found that the NIST database (http://webbook.nist.gov/chemistry/fluid) is very accurate. Also the Lee- Kesler-Plocker equation of state is the most accurate EOS defined in Aspen Plus and HYSYS. The Peng-Robinson EOS (Peng and Robinson, 1976) is good for helium and other fluids. Therefore, the NIST database is used for our scoping calculations and the Lee-Kesler-Plocker EOS (Knapp, H., 1989) is used for all the CO2 computer simulation while the Peng-Robinson EOS is used for helium and other fluids. Task 1-3 Selection of the optimization computer code The objective of this task involves the comparison of the HYSYS and Aspen Plus codes and the selection of one code for Next Generation Nuclear Plant (NGNP) (Macdonald, 2003) simulations. Task technical status overview: As reported in the first annual report the following tasks were already accomplished through the end of September 2002. 1PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility
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