FUNDAMENTALS OF PHYSICS AND MACHINERY
Module Mechanics and Machinery
Academic Year 2022/2023 - Teacher: Emanuele CERRUTOExpected Learning Outcomes
Course Structure
The teaching (6 CFU) includes 28 hours of lectures and 28 hours of other activities, mainly guided numerical exercises for solving problems of practical interest for the profession of food technologist. PowerPoint presentations are mainly used to conduct lessons and exercises. If teaching is given in a mixed formula or remotely, necessary changes may be introduced to what was previously stated in order to comply with the provided and reported syllabus. Learning assessment may also be carried out on line, should the conditions require it.
Information for students with disabilities and/or DSA
As a guarantee of equal opportunities and in compliance with current laws, interested students can ask for a personal interview in order to plan any compensatory and/or dispensatory measures, based on their specific needs and on teaching objectives of the discipline. It is also possible to ask the departmental contacts of CInAP (Center for Active and Participatory Integration - Services for Disabilities and/or DSAs), in the persons of professors Giovanna Tropea Garzia and Anna De Angelis.
Required Prerequisites
Attendance of Lessons
Detailed Course Content
Fundamentals of mechanics: International System of Units (SI); forces applied to the machines; mechanical work; friction: sources and remedies; efficiency; basics on power transmission systems.
Applied thermodynamics (thermodynamic system, first and second law of thermodynamic, thermodynamic diagrams); heat transmission in steady state condition (conduction, convection, radiation); gases and vapours (quality, use of table of water vapour); moist air properties (humidity, enthalpy, psychrometric charts).
Basic machinery in agro industrial plants: heat exchanger (equi- and counter-flow, sizing), pumps (positive displacement pumps, centrifugal pumps, power pump calculation), compressors, centrifugal separators and extractors, main electrical machines, Otto and Diesel internal combustion engines, refrigeration cycles.
Textbook Information
The teacher provides all the material necessary for the study of the topics covered in the classroom (handouts with the theoretical part and slides for the guided development of the exercises). In addition, the following texts are recommended, without prejudice to the freedom to consult any other text:
1. Anzalone G., Bassignana P., Brafa Musicoro G., Meccanica, macchine ed energia, Hoepli.
2. Çengel Y., Termodinamica e trasmissione del calore, Mc GrawHill.
Course Planning
Subjects | Text References | |
---|---|---|
1 | The International System of Units | Didactic material provided by the teacher |
2 | Elements of applied mechanics | Reference 1 - Didactic material provided by the teacher |
3 | Machine efficiency | Reference 1 - Didactic material provided by the teacher |
4 | Passive resistances | Reference 1 - Didactic material provided by the teacher |
5 | Notes on the means to reduce friction | Didactic material provided by the teacher |
6 | Motion transmission systems | Reference 1 - Didactic material provided by the teacher |
7 | Notes on motion regulation systems | Didactic material provided by the teacher |
8 | Basic thermodynamics | Reference 1 - Reference 2 - Didactic material provided by the teacher |
9 | Thermodynamic transformations | Reference 1 - Reference 2 - Didactic material provided by the teacher |
10 | Transmission of heat by conduction | Reference 1 - Reference 2 - Didactic material provided by the teacher |
11 | Transmission of heat by convection | Reference 1 - Reference 2 - Didactic material provided by the teacher |
12 | Transmission of heat by radiation | Reference 1 - Reference 2 - Didactic material provided by the teacher |
13 | Heat exchangers | Reference 1 - Reference 2 - Didactic material provided by the teacher |
14 | Thermodynamics of moist air | Reference 2 - Didactic material provided by the teacher |
15 | Refrigerating machines | Reference 2 - Didactic material provided by the teacher |
16 | Internal combustion engines | Reference 1 - Didactic material provided by the teacher |
17 | Pumps for the agri-food sector | Reference 1 - Didactic material provided by the teacher |
18 | Other machines of interest for the agri-food sector | Didactic material provided by the teacher |
Learning Assessment
Learning Assessment Procedures
Examples of frequently asked questions and / or exercises
All the teaching material (lecture notes with the theoretical part, slides used during the lessons, texts of the exams assigned in previous years) is made available on the STUDIUM platform.
The topics most frequently requested during the oral interview concern:
SI unit of measurement of quantities of interest (energy, power, pressure)
Calculation of efficiency in machines connected in series or in parallel
Friction and grip
Conditions of equilibrium
Power transmission systems
Equation of state of ideal gases and calculation of heat and work exchanged in the main thermodynamic transformations
Modes and laws governing the transmission of heat
Types of heat exchangers and their sizing
Thermodynamic cycles of refrigeration machines
Thermodynamic cycles of internal combustion engines
Calculation of pumping power
Thermodynamics of most air