FUNDAMENTALS OF PHYSICS AND MACHINERY

Module Mechanics and Machinery

The teaching (6 CFU) includes 21 hours of lectures and 42 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 professor Anna De Angelis.

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.

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.

During the course there will be two written tests lasting 2 hours reserved for attending students (attendance of at least 70%). The final exam takes into account the results of the ongoing tests, which are valid only within the academic year in which they were carried out, and consists of two tests, a compulsory written test and an optional oral one, following the passing of the written test. with a score of at least 18/30. The written test is structured in multiple choice questions based on theoretical knowledge or requiring the resolution of numerical exercises. Verification of learning can also be carried out remotely, should the conditions require it. The deadline for booking the written tests usually expires three days before the date of the test indicated in the exam calendar.

The marks attributed will follow the following scheme, also on the basis of written tests:

Unsuitable

Knowledge and understanding of the topic: Important shortcomings. Significant inaccuracies.

Ability to analyze and synthesize: Irrelevant. Frequent generalizations. Inability to synthesize.

Use of references: Completely inappropriate.

18-20

Knowledge and understanding of the topic: At the threshold level. Obvious imperfections.

Analysis and synthesis skills: Just enough skills.

Use of references: As appropriate.

21-23

Knowledge and understanding of the topic: Routine knowledge.

Analysis and synthesis skills: Correct analysis and synthesis, with logical and coherent argumentation skills.

Use of references: Use of standard references.

24-26

Knowledge and understanding of the topic: Good.

Ability to analyze and synthesize: Good, with arguments expressed consistently.

Use of references: Use of standard references.

27-29

Knowledge and understanding of the topic: More than good.

Ability to analyze and synthesize: Remarkable.

Use of references: In-depth.

30-30L

Knowledge and understanding of the topic: Excellent.

Ability to analyze and synthesize: Remarkable.

Use of references: Important insights.

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