Â鶹Éç

Argomenti dell'insegnamento
• Energy resources and final uses. Energy vectors and users of an energy system. Comparative analysis of alternatives paths of energy generation and recovery. • Energy processes and applied thermodynamics. Exergy. General equations for energy and exergy balances. Irreversibility losses. Exergy efficiency assessment of energy plants. • Inverse cycles. Refrigeration machines and heat pumps. Working fluids. Vapor-compression and absorption systems. • Thermodynamics of gas mixtures. Psychrometry. Processes of moist air. Air conditioning cycles. Cooling Towers. • Compressed air generation and distribution systems. Layout of plants and characteristics of components.

Modalità di insegnamento
The course consists of lectures in which the topics are presented by the professor. There are also classes (exercises) that will give practical examples of the application of the theoretical topics. Course topics will be presented at the blackboard and using electronic slides. Teaching material and additional materials will be provided by the Professors during the semester.

Obiettivi formativi
The present course is a core teaching in the context of the Bachelor in Industrial and Mechanical Engineering (curriculum Energetics), in the specific area of Energy and Mechanical Engineering (Area delle Attività Formative Caratterizzanti, Thermal Engineering and Industrial Energy Systems, ING-IND/10). The course consists of 50 hours of frontal lectures and 30 hours of exercises. The lectures introduce the fundamentals of Energetics, by presenting and discussing main issues on the energy resources. Proper terms and definitions will be introduced. Comparative analysis of alternatives paths of energy generation and recovery will be presented. Exergy concept and fundamentals will be also discussed in order to assess irreversibility losses in energy systems and provide an efficient tool for exergy efficiency assessment of plants. Thermodynamics of inverse cycles will be recalled with an in-depth presentation of refrigeration machines, heat pumps and their working fluids. Both vapor-compression and absorption technologies will be presented The knowledge on thermodynamics of gas mixture and psychrometry - already acquired by the students in previous elective courses - will be supplemented with advanced concepts in order to describe and discuss air conditioning cycles. Compressed air generation and distribution systems will be also presented. The layout of compressed air systems will be discussed along with the characteristics and energy performance of their components. Exercises proposed during the course consist in solving practical design problems with the aim of giving the students a deeper comprehension and understanding of the topics. Knowledge and understanding 1. Knowledge and understanding of the fundamentals of energetics, the working principles and technical solutions regarding some significant energy engineering systems Applying knowledge and understanding 2. Applying knowledge and understanding to the solution of energy balances and for problem solving and design of significant engineering systems. Making judgements 3. Ability to make autonomous judgements in the assessment of suitable energy scenarios, in particular regarding energy plants design and operation Communication skills 4. Communication skills to correctly and properly present the concepts acquired in the course and to solve simple numerical application regarding energy systems Ability to learn 5. lifelong learning skills through the possession of the tools for the acquisition of technical information on the energy generation plants and to update knowledge.

Modalità d'esame
- Summative assessment: Examination of the course is carried out by means of an oral exam. The oral examination includes questions to assess the knowledge and understanding of the course topics and questions designed to assess the ability to transfer these skills to case studies and practical applications. Questions on practical applications also assess the ability of the student to apply the knowledge and understanding of the course topics, the ability to make judgments and finally, the student communication skills. 33% written exam, exercises: 60 minutes; ILOs assessed: 1, 2,3; 67% oral exam, theory: 30 minutes; ILOs assessed: 1, 2, 3, 4, 5.

Criteri di valutazione
Students regularly enrolled at the 3rd year of the Bachelor of Industrial and Mechanical Engineering (curriculum in Energetics) are eligible for the attendance of the lessons and the exam. Other exceptional cases have to be discussed with the Professors. The student is asked to attend a written and an oral exam. It is relevant for the oral exam to: master the specific language (also with respect to teaching language); prove the understanding of the topics and learning skills; evaluate and establish relationships between topics; grow specific skills in critical thinking. Regarding the practical applications, it is relevant to clearly describe suitable technical solutions and be able to make critical judgments and apply the theoretical concepts. The exam mark will be assessed as follows: 33% written exam, 67% oral exam.

Bibliografia obbligatoria

• Didactic materials will be provided by the professors during the course.
• G.F.C. Rogers, Yon Mayhew. Engineering Thermodynamics: Work and Heat Transfer, Pearson Education
• K. Wark, Applied Thermodynamics for Engineers, McGraw-Hill
• F. Incropera, D. DeWitt, Fundamentals of Heat and Mass Transfer, Wiley

Altre informazioni
Software used: Cantera.