|SCIENTIFIC DISCIPLINARY SECTOR||ING-IND/11|
The teaching aims at providing the basic knowledge of applied thermodynamic, fluid dynamics and heat transfer that is needed to coordinate design with energy efficiency requirements.
The teaching provides an overview of different aspects of Environmental Technical Physics to let the students understand a wide range of design issues. Problems related to heat and mass transfer, hygrometry, thermodynamic cycles in building engineering are dealt with.
Once the exam has been passed, the student will be able to:
- Understand the working principles of direct and inverse cycles
- Formulate energy balances for systems in steady state
- Determine the efficiency of a thermal machine
- Analyze the different modes of heat transfer
- Calculate thermal resistances in flat and cylindrical geometries
- Propose simple energy efficiency solutions for buildings
Students must have acquired the fundamentals of Mathematics and Phisycs
The teaching is carried out through direct lectures. As an integrative teaching activity, the teaching includes classroom exercises, aimed both at the application of the theoretical notions provided and at the deepening of some theoretical aspects.
Basic definitions; characteristics of pure substances and states of aggregation of matter; phase changes; liquid-vapor mixture; perfect gas model; First principle of thermodynamics for closed systems; First principle of thermodynamics for open systems; application of the first principle of thermodynamics in pumps, turbines and compressors; Second principle of thermodynamics; Clausius and Kelvin-Plank statements; entropy; direct and inverse cycles; efficiency and COP; vapor compression inverse cycle. Air and water vapor mixtures; psychrometric chart; main transformations of humid air.
Basic definitions; laminar and turbulent regime; dynamic boundary layer; viscosity; stresses in a fluid in motion; local derivative and substantial derivative; fundamental equations of isothermal flow: continuity equation and Navier-Stokes equation; simple cases of laminar flow; isothermal flow of fluids in pipes: integral equations; pressure losses; friction factor; Moody diagram; ducts with machines: prevalence.
Conduction. Fourier's law; Fourier equation; simple cases of stationary conduction in flat and cylindrical geometry; thermal resistance; thermal resistances in series and in parallel; stationary conduction with heat generation.
Convection. Forced, natural and mixed convection; fundamental equations of non-isothermal flow; Newton's law; convection coefficient and Nusselt number; non-dimensionalization of equations and relation Nu = Nu (Re, Gr, Pr) in mixed convection; thermal boundary layer; forced convection: relation Nu = Nu (Re, Pr); natural convection: relation Nu = Nu (Gr, Pr).
Thermal radiation. Generalities and definitions; Kirchhoff's law, Stefan-Boltzmann’s law, Planck's law, Wien's regression law, Lambert's law; gray body; energy transfer by radiation between black and gray bodies.
Complex heat transfer problems: generalities; global thermal resistance and thermal transmittance; finned surfaces.
For self-study and in-depth study of specific topics, the following texts are recommended:
First semester, according to the academic calendar. The lessons can be theoretical, practical, or mixed.
All class schedules are posted on the EasyAcademy portal.
The exam consists of two mandatory parts: a written test and a subsequent oral test. The written test lasts two hours and refers to both theoretical and applicative topics. If the outcome of the written test is sufficient, the student is admitted to the oral test, which is also on theoretical and applicative topics. If the oral test is not sufficient, the exam is not passed and the written test must be repeated. Booking to the exam session is via the Unige portal.
The written test evaluates the successful comprehension of the different topics of the course and the consequent ability to apply the concepts acquired to the solution of some simple problems.
The oral test allows to investigate with more accuracy the student's level of knowledge of the theoretical and applicative themes as well as his ability in performing critical reasoning. In the oral examination, attention is also paid to the clarity of the exposition and to the mastery of specific technical language.
To join the exam, the Student must show the University ID and/or other identity document.
During the written test students are allowed to use only a black or blue ballpoint pen, the necessary to erase, a ruler, the calculator. Any needed table / diagram will be supplied within the written test. The usage of handnotes, forms or sheets other than those provided is forbidden.
All the news concerning the teaching (e.g., advices, recommendations, changes to the office hours for students, evaluations of the written tests, etc.) are always posted on the Aulaweb webpage.
Students are advised to update their e-mail address provided by the University with the address of a frequently-checked inbox, so as to receive any urgent notices communicated by the teacher.