Fisica Tecnica Ambientale (EDI)
Building Physics and Building Energy Systems Giovanni Di Nicola
Basic knowledge of Mathemathics and Physics.
KNOWLEDGE AND UNDERSTANDING:
The course enables students to acquire basic knowledge of applied thermodynamics and heat transfer. This knowledge, by integrating the knowledge gained in the mathematics and physics courses, will allow to acquire the necessary tools for the correct interpretation of thermal phenomena and to prepare the student to the design of the plants. In this way the student will acquire a clear awareness of wider multidisciplinary context of engineering, with a clear reference to the aspects strictly connected with the systems and technologies for the production, transport and use of energy and of machines and energy systems design.CAPACITY TO APPLY KNOWLEDGE AND UNDERSTANDING:
The student must be able to perform analysis of components and simple thermal systems in order to assess the energy performance of thermal machines and choose the best solutions regarding the use. The student will be able to apply the acquired knowledge, recognizing the importance of environmental, economic and technological constraints and proposing a critical interpretation and theoretical modeling, integrating with other professionals working in the construction sector. This ability will be allowed through a number of professional skills, such as: 1. basic knowledge of applied thermodynamics and heat transfer; 2. ability to conduct first principle analysis on the components of machines and systems operating on inverse thermodynamic cycles; 3. ability to conduct analysis on heat transfer in simple systems operating in steady state with the electrical analogy method; 4. basic knowledge of acoustic and lighting comfort.TRANSVERSAL SKILLS:
The course will contribute to the knowledge and understanding of mathematical methods and the physical and chemical phenomena essential for engineering disciplines. The ability to solve numerical problems will help the student to improve the general degree of independence of judgment, the communication skills that comes from the awareness of his own skills and the ability to learn independently and to draw conclusions.
Contents (48 hours).
Introduction to thermodynamics. State thermodynamics. Thermodynamics Charts. Vapours, ideal gas, incompressible substances. First law of thermodynamics for closed and open systems. Application of first law to simple system components. Second law of thermodynamics. Clausius and Kelvin postulates. Direct and reverse thermodynamic cycles. Direct and reverse Carnot cycle. Entropy. Vapour compression reverse thermodynamic cycle.
Thermodynamic properties of gas-vapor mixtures. General definitions. The psychrometric charts. Building thermophysics. Heat and mass balances.
Heat transfer mechanisms. Steady state conduction. Electric analogy and resistive model. Thermal convection. Flow regimes. Adimensional numbers and correlations for practical use. Thermal radiation. Black-body and real-surfaces radiation. Heat transfer between black bodies, gray bodies within cavities. Heat transfer combined mechanisms. Walls transmittance. Enhanced heat transfer.
Acoustic comfort. Fundamentals of sound waves. Phono adsorbance. Phono insulation. Visual comfort. Photometric parameters. Indoor lighting computational methods.
Exercises (24 hours).
Exercises on the laws of thermodynamics. T-s and P-h diagrams for the reverse thermodynamic cycles. Exercises on the thermodynamic properties of gas-vapor mixtures and use of the psychrometric charts. Exercises on the heat transfer mechanisms and on the electric analogy and resistive model.
Development of the examination
LEARNING EVALUATION METHODS
The assessment of student learning consists of a test to be completed in two hours. The test is divided in two parts:
- a first part based on the solution of three exercises on topics covered in the course;
- a second part based on three theoretical questions on topics covered in the course.
A further oral exam will be taken, consisting in the discussion on one or more topics covered in the written test. To access the further oral exam, the student must have obtained at least sixteen points in the first test. In case of failure of the oral exam, the student must also repeat the first test.
LEARNING EVALUATION CRITERIA
To successfully pass the exam, the student must demonstrate, through the tests described above, to have understood the concepts of applied thermodynamics and heat transfer exposed during the course; to show ability to conduct first principle analysis on the components of machines and systems operating on inverse thermodynamic cycles; to show ability to conduct analysis on heat transfer in simple systems operating in steady state with the electrical analogy method; to have basic knowledge of acoustic and lighting comfort.
LEARNING MEASUREMENT CRITERIA
For each one of the tests specified before, it is assigned a score between zero and thirty. The overall grade, thirty, is the final mark of the written test or, in case of oral exam, is the average of the marks obtained in the two tests, with rounding to the entire excess.
FINAL MARK ALLOCATION CRITERIA
Because the overall outcome of the evaluation is positive, the student must achieve at least eighteen points in the average of the marks obtained in the two tests described above. The highest rating is achieved by demonstrating a thorough understanding of the course content in the tests.
Lecture notes (available on-line at https://lms.univpm.it/enrol/index.php). Y. Cengel, Termodinamica e trasmissione del calore, 2° edizione, McGraw-Hill Italia, Milano, 2005.
- Ingegneria Edile (Corso di Laurea Triennale (DM 270/04))