CODE 72370 2023/2024 6 cfu anno 2 INGEGNERIA MECCANICA 8784 (L-9) - LA SPEZIA ING-IND/10 Italian LA SPEZIA 2° Semester Questo insegnamento è un modulo di: AULAWEB

## AIMS AND CONTENT

### LEARNING OUTCOMES

The course has the following specific objectives: to give some fundamentals on heat transfer applied to energy transformation and production; to provide some general bases in the energetic field, in such a way the student can make correct options on the production and rational use of energy; to give the first elements on solar and nuclear energy.

### AIMS AND LEARNING OUTCOMES

See Fisica Tecnica (cod. 72639).

### TEACHING METHODS

See Fisica Tecnica (cod. 72639).

### SYLLABUS/CONTENT

HEAT TRANSFER

One-dimensional steady-state thermal conduction: Fourier's law, thermal conductivity, thermal conduction in flat and cylindrical geometries, thermal resistance, multilayer flat walls, complex flat walls, multilayer cylindrical pipes. Multidimensional transient thermal conduction: Fourier's law, general equation of conduction, thermal bridges, thermal diffusivity, periodic steady state in a semi-infinite medium.
Convective heat transfer: viscosity, coefficient of cubic expansion, Newton's law, convection coefficient. Forced convection on a flat plate and in a tube. Natural convection on a flat plate and in a cavity. Dimensionless numbers and solving problems of convective heat transfer.
Radiative heat transfer: electromagnetic waves, black body, Planck's and Wien's laws, emissivity, gray body, irradiation, absorption, reflection, and transmission factors, Kirchhoff's law, selective surfaces, view factor, heat exchange between black and gray surfaces, emissivity coefficient.
Combined mechanisms of heat transfer: heat exchange at a surface, critical heat transfer coefficient, multilayer and complex flat walls, heat transmittance. Heat transmittance of opaque elements of the building envelope and windows, thermal bridges, multilayer cylindrical pipes, sizing of a heating body.
Introduction to combined mechanisms of transient heat transfer: thermal capacity, transient heat transfer of a thin body, transient heat transfer of a multilayer wall with air conditioning system, periodic heat transmittance.

THERMOHYGROMETRY AND HVAC SYSTEMS

Psychrometrics: overview. Thermo-hygrometric quantities: specific, absolute, and relative humidity, specific volume, enthalpy of moist air, dew point temperature, adiabatic saturation temperature. Psychrometric chart, measurement of relative humidity.
Thermo-hygrometric comfort. The thermoregulatory system of the human body. Thermal balance of the human body. Overall comfort indices. Local discomfort indices (overview).
Transformations of moist air: adiabatic mixing, sensible heating, sensible cooling and dehumidification, adiabatic humidification. Classification of air conditioning systems. Mass and energy balance of a conditioned environment. Heating system: losses due to ventilation and transmission, sizing and calculation parameters.

FUNDAMENTALS OF ENERGETICS

Primary energy sources and renewable sources. Reminders on world and national energy panorama relating to energy consumption and production. Nuclear energy. Notes on the impact of the energy sources.

See Fisica Tecnica (cod. 72639).

## TEACHERS AND EXAM BOARD

### Exam Board

GUGLIELMO LOMONACO (President)

FRANCESCO DEVIA

GIOVANNI TANDA

ANNA CHIARI (President Substitute)

ANNALISA MARCHITTO (President Substitute)

## LESSONS

### LESSONS START

https://corsi.unige.it/8784/p/studenti-orario

### Class schedule

The timetable for this course is available here: Portale EasyAcademy

## EXAMS

### EXAM DESCRIPTION

At the end of the classes, only those who have passed the first module (72371 – Modulo di Termodinamica Applicata) are eligible to take the partial written and oral exam on the module's curriculum. This opportunity is limited to the summer session exams (May-July). In case of failure to pass the partial exam, the student will be required to take the written and oral exam on the entire course curriculum.
As for the exam procedures for the partial exams, the ones specified for the final exam apply (see sheet 72369 – Fisica Tecnica).

### ASSESSMENT METHODS

As for the evaluation of partial exams, the same criteria specified for the final exam apply (see sheet 72369 – Fisica Tecnica).

### Exam schedule

Data Ora Luogo Degree type Note
10/01/2024 10:00 LA SPEZIA Scritto + Orale La data della prova orale viene comunicata in sede di scritto.
23/01/2024 10:00 LA SPEZIA Scritto + Orale La data della prova orale viene comunicata in sede di scritto.
06/02/2024 10:00 LA SPEZIA Scritto + Orale La data della prova orale viene comunicata in sede di scritto.
26/03/2024 10:00 LA SPEZIA Scritto + Orale La data della prova orale viene comunicata in sede di scritto.
28/05/2024 10:00 LA SPEZIA Scritto + Orale La data della prova orale viene comunicata in sede di scritto.
17/06/2024 10:00 LA SPEZIA Scritto + Orale La data della prova orale viene comunicata in sede di scritto.
09/07/2024 10:00 LA SPEZIA Scritto + Orale La data della prova orale viene comunicata in sede di scritto.
10/09/2024 10:00 LA SPEZIA Scritto + Orale La data della prova orale viene comunicata in sede di scritto.