Heat transfer is a branch of thermodynamics whose aim is to study the laws of propagation of thermal energy. The role of heat transfer is crucial in the correct design of electric/electronic devices; its study is deemed to be of great importance in the preparation of students in electrical engineering.
In this course, heat transfer mechanisms (conduction, convection and radiation) will be presented and discussed, with particular reference to electronic and electric systems, such as electronic equipment cooling. Heat transfer processes will be first described from the theoretical point of view; then several practical calculation examples will be provided. Students are expected to acquire the ability of facing and solving heat transfer problems in the field of electronic/electric systems.
This course is aimed at providing the basic knowledge, from the theoretical (heat transfer laws) and practical (problem solving) standpoints, with particular reference to thermal control and cooling of electric/electronic components. At the end of the course, the student is expected to face and solve basic heat transfer problems, with particular reference to electronic equipment cooling.
There are no specific requirements.
The time-schedule of the course is five/six hours per week (second semester only). At the end of lessons, two/three hours of lab activity will be scheduled for groups of 8-10 students.
Students having disabilities or Specific Learning Disorders can request suitable aids for the examinations. Such aids will be defined according to specific needs, together with the Referent for the Polytechnic School of the Committe for the inclusion of Students with Disabilites and with SLD. Students in such conditions are invited to get in touch (via e-mail) with the Teacher a sufficient time before the examination, inserting in copy the Referent for the Polytechninc School (https://unige.it/en/commissioni/comitatoperlinclusionedeglistudenticondisabilita.html), without sending any document about their disabilites.
Introduction: thermal problems in electric/electronic systems
Conduction heat transfer: Fourier postulate, 1D and 3D conduction equation in plane and cylindrical coordinates. Contact resistance. Thermal-electrical analogy. Thermal transmittance. Transient conduction. Numerical techniques. Practical examples.
Convection heat transfer: Newton equation, external and internal boundary layer. Forced and free convection. The heat transfer coefficient: correlations among nondimensional groups; practical examples. Phase changes (condensation and vaporization). Analogies between mass transfer and heat transfer.
Radiation heat transfer: Stefan-Boltzmann law. Black and gray surfaces, radiant heat transfer among black and gray surfaces; practical examples.
Conventional and compact heat exchangers. Thermal analysis and design.
Electric/electronic equipment cooling: conduction, contact resistances, air and liquid convection, finned surfaces, immersion cooling, heat pipes.
Thermometry foundations. resistance thermometers and thermocouples. Infrared thermal imaging for hot spot identification in electric systems and plants.
G.Tanda: “Dispense del Corso Trasmissione del Calore per l’ingegneria elettrica”, http://www.aulaweb.unige.it.
F.Kreith: " Principles of Heat Transfer", 7th Ed.
Exercises:
G.Guglielmini, E.Nannei, C.Pisoni: "Problemi di Termodinamica Tecnica e Trasmissione del Calore", ECIG, Genova.
Ricevimento: For explanations, contact the teacher by E-mail (giovanni.tanda@unige.it) to arrange a meeting in his office (DIME/TEC, via all'Opera Pia 15a)
GIOVANNI TANDA (President)
GUGLIELMO LOMONACO
ANNALISA MARCHITTO
MARCO FOSSA (President Substitute)
STEFANO MORCHIO (President Substitute)
https://corsi.unige.it/8716/p/studenti-orario
Examination: oral. Examination dates are scheduled according to the official calendar.
Students who have valid certification of physical or learning disabilities on file with the University and who wish to discuss possible accommodations or other circumstances regarding lectures, coursework and exams, should speak with the person-in-charge of Engineering School (https://unige.it/commissioni/comitatoperlinclusionedeglistudenticondisabilita.html)
Oral examination, based on a specific subject among those tackled during the taught course, with in addition a couple of small synthetic questions on other one/two subjects.
The aim of the examination is to assess the capability of solving specific thermal problems (including physical formulation and mathematical passages) and the skill in discussing and arguing them.
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