Teacher
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GIOVANNELLI AMBRA
(syllabus)
• Machines and Heat exchangers: Classifications; • State functions and process-dependent entities. Equations of state; • Fundamental laws of thermodynamics: conservation, equivalence and evolution of a thermodynamic system; • Energy conservation; • Irreversible processes; • Thermodynamic processes and diagrams. Relevant thermodynamic processes (e.g. isentropic, polytropic, isothermal, isobaric, isochoric processes) • Compression and expansion processes: adiabatic processes, intercooled compression, re-heated expansion) • Thermodynamic laws applied to the analysis of energy conversion systems: relevant case studies • Combustion processes - Combustion: generalities; - Combustion at constant volume; - Combustion at constant pressure for open and closed systems. • Thermodynamic cycles and periodical processes - Ideal, limit and real cycles; - Direct and inverse cycles; - Performance of thermodynamic cycles: power, efficiency, COP and other relevant indexes - Relevant cycles: Brayton/Joule, Rankine, Hirn, Stirling, Ericsson, Beau de Rochas, Diesel, Sabathé) - Combined cycles - Periodical processes and related diagrams
• Introduction to applied fluid-dynamics: - Control volume analysis; - 1D, 2D and 3D analyses; • Conservation of mass, momentum and energy. The entropy. • The effect of fluid viscosity and compressibility: • Definition of Mach Number and equations for gasses in terms of Mach Number; • Subsonic, transonic and supersonic flows; • Fanno Flow; • Rayleigh Flow; • Varying-area isentropic flows: Hugoniot equations for nozzles and diffusers; • Converging-diverging nozzles; • Nozzles, diffusers and converging-diverging nozzles in real conditions. • Evaluation of thrust, work, power and efficiency in simple cases. • Cavitation in hydraulic machines: generalities, Net Positive Suction Head (NPSH), • Relevant applications for energy conversion and propulsion systems • Cavitation: generalities, Net Positive Suction Head available and required • Relevant cases in hydraulic plants
(reference books)
• L. Borel, D. Favrat, "Thermodynamics and Energy Systems Analysis", EPFL Press, 2010, ISBN 978-2-940222-45-2 • R. D. Zucker, O. Biblarz, “Fundamentals of Gas Dynamics”, Ed. Jhon Wiley & Sons, 2002, ISBN 0-471-05967-6
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