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## HEAT TRANSFER

CODE 66382 2022/2023 6 cfu during the 1st year of 10170 ENERGY ENGINEERING (LM-30) - SAVONA ING-IND/10 English SAVONA 1° Semester

## OVERVIEW

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.

## AIMS AND CONTENT

### LEARNING OUTCOMES

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.

Lectures

### SYLLABUS/CONTENT

HEAT CONDUCTION: General heat conduction equation; boundary and initial conditions; the thermal resistance approach; 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 and preliminary analysis; conservation of mass equation; conservation of momentum equations: newtonian fluids and Navier-Stokes equations; conservation of energy equation; dimensionless 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 assumption; dimensionless 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.

TWO-PHASE HEAT TRANSFER: Fundamentals of pool and flow boiling; Nusselt equation for condensation.

• Y. Cengel. Heat and Mass Transfer, Ed. McGrawHill, 2015.
• 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

## LESSONS

### LESSONS START

https://courses.unige.it/10170/p/students-timetable

### Class schedule

All class schedules are posted on the EasyAcademy portal.

## EXAMS

Oral examination

### ASSESSMENT METHODS

The oral examination in based on a specific topic among those presented during the course, with in addition a couple of short questions on other one/two subjects.

The aim of the examination is to assess the student knowledge and the skill in reasoning and subject presentation.

Students with learning disorders ("Disturbi Specifici di Apprendimento", DSA) will be allowed to use specific modalities and supports that will be determined on a case-by-case basis in agreement with the delegate of the Engineering courses in the Committee for the Inclusion of Students with Disabilities.