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Highlights of the annual activities are summarized below: In terms of the schedule and budget, we are right at the target. Task 1 (development of CO2 Brayton cycle) including a number of baseline calculations has been completed. Upon completion of Task 1, we mainly focused on Task 2. Parametric studies have been performed to determine the overall cycle efficiency sensitivity to key parameters. For supercritical CO2 Brayton cycle, a case from a HYSYS simulation was checked to make sure that exit conditions of a compressor calculated using HYSYS agreed with those from the CO2 pressure-enthalpy diagram through sequential compression steps. They agree very well. Among three working fluids studied for the indirect power conversion study (PCS), supercritical CO2 has the highest cycle efficiency due to less compression work as a result of the higher densities of supercritical CO2 than other fluids used for the indirect cycle. Supercritical CO2 also results in the smallest turbomachinary components. Helium direct cycle eliminates an IHX and consequently requires the smallest heat transfer area due to the higher heat capacity and thermal conductivity than those of other fluids. For the final selection of the best working fluid, or fluid mixture, trade-off studies need to be performed for efficiency, capital cost, maintenance cost, the stability of fluids through compressor, potential leakage from PCS, and other relevant issues. This project will include some of these issues later in FY-05 efforts. Two technical papers were published and one paper was accepted in peer review journal. C.H. Oh, R. Moore, Enhancement of the Thermal Efficiency for High Temperature Gas-Cooled Reactors, the 10th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Seoul, Korea, October 5-9, 2003. C.H. Oh and R.L. Moore, Parametric Investigation of Brayton Cycle for High Temperature Gas-Cooled Reactors, ASME Summer Heat Transfer Conference, Charlotte, NC, July 11-15, 2004. C.H. Oh and R.L. Moore, Brayton Cycle for High Temperature Gas-Cooled Reactors, to be published in March Issue of Nuclear Technology, 2005. Completed Task 3-1 – Characterization of creep deformation of coarse-grain MA 754 that included completion of subtasks 3-1-2 High temperature mechanical and creep properties of coarse-grained MA 754 and 3-1-3 Mechanical and creep properties of fine-grained MA 754. A manuscript describing the results was accepted for publication in a peer-reviewed journal. T. C. Totemeier, and T. M. Lillo, Effect of Orientation on the Tensile and Creep Properties of Coarse-Grained INCONEL Alloy MA754, accepted for publication in Metallurgical and Materials Transactions A. Completed subtask 3-2-2 Corrosion testing of MA 754 in supercritical CO2 Characterized the creep microstructures of MA 754. These results were also incorporated into the manuscript mentioned under Task 3-1 above. ixPDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle
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