The course deals with one of the fundamental aspects of the energy engineering, introducing the different methods of heat transfer through theoretical lessons and numerical exercises.
The course introduces the fundamentals of heat-transport controlled phenomena in its fundamental mechanisms (conduction, convection and thermal radiation) and shows some examples of practical application. The student will demonstrate a deep knowledge of the different heat transfer mechanisms and to be able to apply the fundamental laws to simple engineering problems. The goal of this course is to provide to the student the basis for the thermal analysis of energy transformation and production processes.
AIMS AND LEARNING OUTCOMES
At the end of course the student is expected to be able to:
understand engineering problems related to the heat transfer;
apply basic laws and models to the solution of simple heat transfer problems.
HEAT CONDUCTION: General heat conduction equation; boundary and initial conditions; the thermal resistance concept; critical radius of insulation; heat transfer from finned surfaces; lumped system analysis; transient heat conduction in semi-infinite solids; finite difference formulation of differential equations in heat conduction.
HEAT CONVECTION: Fundamentals; dimensional analysis; conservation of mass equation; conservation of momentum equations: newtonian fluids and Navier-Stokes equations; conservation of energy equation; nondimensionalized forced convection equations and similarity; analogies between momentum and heat transfer; turbulence; Blasius solutions of convection equations for a flat plate; forced convection in tubes; natural convection: Boussinesq hypothesis; nondimensionalized natural convection equations.
THERMAL RADIATION: Fundamentals; blackbody and gray surfaces radiation; radiation heat transfer: black surfaces and diffuse, gray surfaces.
HEAT EXCHANGERS: Classification; the log mean temperature difference method; the effectiveness–NTU method.
Y. Cengel, A. Ghajar: Heat and Mass Transfer: Fundamentals and Applications, McGraw-Hill, 2010
Incropera, DeWitt, Bergman, Lavine: Fundamentals of Heat and Mass Transfer, John Wiley and Sons, 2011
A.Bejan, Heat Transfer, John Wiley and Sons, Inc, 1993
Ricevimento: Available on demand through email request.
The oral examination allows to verify the complete knowledge, understanding and ability to explain of the different topics of the course.