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Macchine e Sistemi Energetici (M/Z)
Fluid-Machines and Energy Systems
Leonardo Pelagalli

Seat Ingegneria
A.A. 2016/2017
Credits 9
Hours 72
Period I
Language ENG

Basic concepts of Technical Physics and Fluidynamics

Learning outcomes
The course gives the student knowledge and understanding of the working principles of fluid-machines and energy systems. The topics treated in the course are the basis for the understanding of the operation of the main traditional energy conversion systems and of the fluid-machines fitted in these plants, covering positive displacement and dynamic, thermal and hydraulic types thus contributing to the specific education of mechanical engineering in thermal fluid-machines design. This knowledge, integrating that gained in the courses of Fisica Tecnica and Fluidodinamica, permits the student to cope with specific issues of thermodynamics energy conversion systems, environmental effects related to energy production and final use of energy
The student will have the ability assess the energy, economic and environmental performance of fluid-machines and choose the best solution for a given application. These capabilities will consist in a series of skills such as: 1. the ability to choose the fluid machine suitable for a given plant; 2. the determination of the operating point of a machine according to load; 3. the evaluation of the overall performance of an energy conversion system
Since the performance of a fluid-machine involves mechanical, fluid-dynamical, thermal and environmental topics, the course will contribute to the completion of the student’s basic technical competence by coordinating concepts from different cultural areas and thus enabling the graduates to choose autonomously the methods and techniques most suitable to identify optimum solutions..

Introduction and classification of energy conversion plants and fluid machines. Reminds on thermo- and fluid-dynamic concepts applied to fluid machines. Steam plants: thermodynamical cycles and methods to increase conversion efficiency; steam generator and basics on the other components of the plant. Turbogas plants: thermodynamical cycles and methods to increase conversion efficiency and specific work; basics on turbogas plant components; basics on combined and cogeneration plants. Hydraulic turbines: hydraulic energy exploitation in hydraulic plants; impulse and reaction turbine types. Hydraulic pumps: centrifugal and positive displacement machines; pump's operative point and control flow methods. Positive displacement compressors: functioning and working cycle. Reciprocating internal combustion engines: ideal and indicated reference cycles; fundamental performance indexes definition; torque regulation methods for both compression and spark ignited engines, torque and power curves and road load matching.

Development of the examination
The assessment of student's learning will take place by means of an oral preceded by a written pre-test consisting of synthetic answers to three or four questions about basic topics; the overcoming of the pre-test is needed for the admission to the oral examination.

The assessment of learning, based on the results of both the written pre-test and the oral exam, consists in verifing: the student's knowledge on the basic concepts connected with the operation of the machines and the energy systems covered during the course, his competence on machine and energy systems configurations and operating conditions, his ability to solve simple numerical problems with correct use of units and order of magnitude.

The student knowledge is graded through the attribution of a final mark out of thirty. The passing score is 18/30, the highest score is 30/30, brilliant students may receive in addition a praise. The final evaluation results from the weighted average of the pre-trial written examination (25%) and oral (75%). To pass the exam both tests should be sufficient.

The outcome of the evaluation is positive if the student proves to have knowledge of all the basic subjects covered in the course. The highest score is achieved by demonstrating in-depth knowledge of the course contents. Praise is given to students who are particularlly brilliant in exposure and/or demonstrat particular mastery of the matters treated in the course, being able to analyze topics not explicitly covered or to treat standard topics in alternative ways.

Recommended reading
- Lecturer's notes - Negri di Montenegro Giorgio, Bianchi Michele, Peretto Antonio, “Sistemi energetici e macchine a fluido (1)“, Editore: Pitagora

  • Ingegneria Meccanica (Corso di Laurea Triennale (DM 270/04))

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