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CODE 60356 2024/2025 12 cfu anno 2 INGEGNERIA CIVILE E AMBIENTALE 8715 (L-7) - GENOVA ING-IND/11 Italian GENOVA Per sostenere l'esame di questo insegnamento è necessario aver sostenuto i seguenti esami: Civil and Environmental Engineering 8715 (coorte 2023/2024) GENERAL PHYSICS 56686 2023 MATHEMATICAL ANALYSIS I 72290 2023 Questo insegnamento è composto da: AULAWEB

## OVERVIEW

The course aims to provide elements of engineering thermodynamics for the analysis of energy processes and of associated environmental issues.
Psychrometry and heat transfer are introduced and the relevant physical mechanisms are described. Technical applications of the above mentioned physical principles are introduced.

## AIMS AND CONTENT

### LEARNING OUTCOMES

Solution of simple problems concerning energy systems and energy conversion. Evaluation of the effectiveness of direct and reverse cycles. Thermal and psychrometric calculations. Calculations concerning most air and air conditioning.

### TEACHING METHODS

Solution of simple energy problems. Evaluation of the effectiveness of direct and reverse cycles. Thermal and psychrometric calculations. Calculations concerning most air and air conditioning. Elementary issues in acoustics and lighting.

### SYLLABUS/CONTENT

ENVIRONMENTAL ENGINEERING PHYSICS

Engineering thermodynamics: Introduction to energy issue: renewable and not renewable resources, energy needs and availability, environmental impacts. Energy transfer by heat. Energy transfer by work. State functions. Thermodynamic transformations. Ideal gas law and gas mixtures. Internal energy. First law of thermodynamics. Energy balance for control volumes. Second law of thermodynamics. Reversible and irreversible processes. Entropy. Pure substance. Thermodynamic planes: (p, T), (p,v), (T,S) (H, S), (p, H). Carnot theorem and cycle (direct and reverse). Energy conversion efficiency. Brayton cycle. Rankine cycle. Internal combustion cycles. Refrigeration cycle. Reverse cycle machines: refrigerator and heat pump. Refrigerants. Coefficient of performance. Absorption refrigeration system.
Heat transfer: Mechanisms of heat transfer. Thermal conduction. Fourier equation. Mono-dimensional problems. Thermal resistance. Transient thermal conduction. Forced convection. General principles and boundary layer. Dimensionless groups. Internal and external convection. Forced convention correlations. Natural convection. Forced and natural convention correlations. Radiative heat transfer. Black body. Planck’s and Wien’s laws. Emissivity and absorptivity. Legge di Kirchoff. Gray body. View factors. Lambert law. Radiation in black cavities. Radiation in gray cavities. Combined mechanisms of heat transfer. Overall heat transfer coefficient. Heat transfer in buildings.

TECHNICAL PLANTS

Psychrometrics: Thermodynamics of moist air. Psychometric functions and their relations. Fundamental transformations of moist air. Psychrometric diagrams. Psychrometric measurements. Surface and interstitial condensation. Thermohygrometric comfort. Buildings energy and mass balance. Air conditioning plants. Summer air conditioning. Winter air conditioning.
Applied acoustics: Wave-equation for sound propagation. Sound levels. Sound spectra. Sound propagation outdoors. Reflection, diffraction, refraction. Sound propagation in rooms. Acoustic reverberation. Conventional reverberation time.
Lighting: Fundamentals: luminous intensity, illuminance, luminance, flow. Sources of artificial light. Solid photometric. Illumination of a point by point source. Design of a maximum of lighting inside. Method of the utilization factor. Natural lighting method of the average daylight factor

### RECOMMENDED READING/BIBLIOGRAPHY

• M. J. Moran, N. H. Shapiro “Fundamental of Engineering Thermodynamics”, John Wiley & sons, Inc.1988
• Yunus A. Cengel: “Termodinamica e trasmissione del Calore”, Mc Graw Hill, 1998
• C. Pisoni, G. Guglielmini “ Introduzione alla Trasmissione del Calore” Ed. CEA, 2001.
• F. Kreith, "Principi di trasmissione del calore", Liguori Editore, 1975.
• K.P. Incropera , D. P. DeWitt, T. L. Bergman, S. Lavine, ”Introduction to Heat Transfer”, Wiley, 2006.
• D. DiLaura, K.Houser, R. Mistrick, G. Steffy, IES Lighting Handbooh (Application Volume) – 10th Edition, 2014.
• G. Guglielmini, E. Nannei, C. Pisoni, “Problemi di Termodinamica Tecnica e trasmissione del Calore”, ECIG, 1993.
• IES Lighting Handbook (Application Volume), 1987
• F. A. Everest, Manuale di acustica, Hoepli, 1996.
• Lecture notes by the lecturer (Lecture notes are available on Aulaweb)

## LESSONS

### LESSONS START

https://corsi.unige.it/8715/p/studenti-orario

### Class schedule

The timetable for this course is available here: Portale EasyAcademy

## EXAMS

### EXAM DESCRIPTION

Written test and oral questions about the topics addressed during the course. The oral exam is preceded by a written test, aiming to check an adequate level of knowledge to solve simple problems. Subjects of the written test are Engineering Thermodynamics, Heat Transfer, Psychrometry and A/C plants. The assesment is: Positive or Negative;a student who does not pass the written test is recommended not to sit for the oral test. The validity of a positive written test is limited to the period between two following exams.  Attendance at lectures and other forms of activities is recommended.

### FURTHER INFORMATION

No formal prerequisites. Students are recommended to pass before the exams in Analisi Matematica 1, Geometria and Fisica Generale.