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Abstract Supercritical CO2 (s-CO2) Brayton power plants will be part of the next-generation energy conversion systems since they are based on technically challenging thermodynamic cycles with processes that occur entirely above the critical point of the working fluid. Advantages of these new power systems are the possibility of using external thermal energy sources, like concentrated solar radiation or biomass combustion, high conversion efficiency at moderate temperatures, and possibly low operational and investment costs. Supercritical CO2 as the working fluid presents additional advantages: it is thermochemically stable up to very high temperatures, comparatively inert regarding the containing materials, and it is non-toxic and relatively inexpensive. Although research on s-CO2 power applications has grown con- siderably in the last years, and the expansion of simulation capabilities is revolutionizing engineering design, the thermodynamic cycle analysis/optimization, and the design of the system components are activities still performed independently and in an iterative manner. This conventional design procedure is time-consuming and it might neglect portions of the potentially vast design envelope. This work stemmed from the observation that, with today’s simulation capabilities, in case of a relatively simple system like a s-CO2 power plant, the optimization of the thermodynamic cycle and the design of the system components can be integrated into a single calculation procedure, which can be subjected to an automated con- strained optimization process. The objective of this work is therefore to perform a preliminary assessment of the envisaged methodology. First, the thermodynamic analysis of the system has been performed thanks to a computer code developed for this purpose, and it consists in the study of three s-CO2 power cycle configurations. The thermal efficiency is prescribed to a value that is greater than that of a cutting-edge gas turbine, while the power capacity is set to the same value. These are 50% and 18.7 MW respectively, and the effect of the components operation on the turbine inlet temperature (TIT) and regeneration load is studied. The recompression Brayton cycle configuration allows to comply with the specified performance with the lowest turbine inlet temperature (787◦C) and at moderate maximum pressure (272 bar). However, it requires larger mass flow rates leading to larger equipment. The operating conditions given by this analysis are used as inputs for the design of the components, which is focused on the re- Master of Science Thesis J.S. Bahamonde NoriegaPDF Image | Design method for s-CO2 gas turbine power plants
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