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Chapter 4 Integrated system design This chapter is devoted to the application of the simultaneous thermodynamic analysis and components design to three specific applications. The first study case analyzes the possibility of using the s-CO2 Brayton system for aerospace propulsion. The second deals with the ap- plication to solar power generation and the third consists in the statement of an optimization procedure. 4-1 Aircraft propulsion systems Since the first aerospace applications of gas turbines and propellers at the beginning of the last century, the aircraft propulsion technology for commercial purposes has evolved until the turbofan engine, which is nowadays widely used in most of the modern airliners. Large improvements have been obtained through the years by means of efficient engine designs and materials, advanced fuel injection and combustion systems, etc. However, the worldwide energy usage and emissions trends make necessary to take a step further and think of new, innovative propulsion systems. The current aircrafts generate the needed thrust by means of air breathing engines (gas turbines with open cycles) and open propellers, with overall maximum efficiencies of about 45% [9]. The s-CO2 closed Brayton system can be a good alternative since it presents not only potential larger efficiencies, but also the advantage of smaller turbomachinery. In order to set an appropiate frame to analyze the potentialities of the s-CO2 system, it is necessary to choose a reference aircraft engine. The characteristics of such device will be used for the design of the supercritical system. 4-1-1 Reference Engine: Rolls - Royce Trent 1000 The state-of-the-art turbofan Rolls-Royce Trent 1000-A1, used on the Boeing 787-8 aircraft, is the chosen as the reference engine since it is one of the best available technologies. The specifications of this propulsion system are shown in Table 4-1. Master of Science Thesis J.S. Bahamonde NoriegaPDF Image | Design method for s-CO2 gas turbine power plants
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