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iv generator and the cooler since they are the largest and possibly most expensive components of the s-CO2 power plant. The steady state models are based on the discretization of the flow passages and the evaluation of the fluid properties in each element. The models are validated against the design and performance data of an existing s-CO2 heat exchanger, and a well-know commercial design code. The methodology that combines the thermodynamic analysis and the components design is implemented into a computational routine that is tested with two study cases. The first one is aimed as a first assessment of a futuristic concept, namely the adoption of a s-CO2 closed Brayton gas turbine for aircraft propulsion. The s-CO2 power system is designed such that it exceeds the performance rating of a cutting-edge turbofan, and at the same time the weight of the system is decreased as much as possible. The calculations show that the regenerators, designed with current technology for stationary applications, have a weight of minimum 5 tonne, which is almost the weight of the reference engine. The second study case regards the design of a power plant using a solar tower power as the heater, with the same power output and efficiency as the ones adopted for the thermodynamic analysis (18.7 MW, 50%). The methodology is extended to the dimensioning of the heliostat field, since its share of the total investment cost is possibly the largest. This exercise provides key characteristics of the power plant: 636 heliostats that occupy an area of 300 m2, regenerators weight of 17 tonne, dry cooler weight of 18 tonne, TIT of 647◦C, and compressor discharge pressure of 245 bar. Finally, the formulation of an optimization problem for the net present value of the solar power plant is outlined. Although the calculations are not performed due to the large computational time required, the potential of the methodology is exemplified, pointing to further work in this promising direction. J.S. Bahamonde Noriega Master of Science ThesisPDF Image | Design method for s-CO2 gas turbine power plants
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