99536 - CONTROLLO DEL RUMORE NEGLI IMPIANTI TERMOTECNICI E ILLUMINOTECNICA M

Learning outcomes

At the end of the course, the student possesses he basic knowledge for the noise control of HVAC systems, the estimate of the sound power and design the noise reducing devices of systems. Furthermore, the basic knowledge for the design natural and electric lighting that integrates occupant comfort and energy efficiency. In particular, the student is able to: - Determination of sound power levels of noise sources; - design the noise reducing devices according to the standards and laws; - design natural and electric lighting that integrates occupant comfort and energy efficiency.

Course contents

NOISE CONTROL

1. Physical acoustics.
The sound phenomenon. Principal acoustic quantities.
Velocity of sound in various media.
Plane, spherical, cylindrical, stationary waves.

2. Psychophysical acoustics (outline).
Human auditory system.
Disturbance and damage by noise.

3. Decibel sound levels and spectra.
Decibel scale.
Filters of (1/n of) octave.
Frequency weighting curves.
Sound level metrics.
Sound level meters.
Hints at Fourier analysis.

4. Noise in the outdoor environment.
Sound propagation in the outdoor environment.
Laws and technical standards.
Noise from industrial plants.

5. Building acoustics.
Sound insulation: basic laws.
Laws and technical standards.

6. Acoustics of enclosed spaces.
Geometric treatment.
Energy-statistical treatment. Reverberation.
Sabine and Norris-Eyring formulas of reverberation time.
Passive sound-absorbing materials and systems.

7. Equipment noise.
Acoustic characterization of sound sources of technological equipment.
Acoustic characterization of the equipment components (ducts, diffusers...).
Measurement of sound power
Determination of the sound level injected by the systems into buildings
Determination of the sound level emitted by the installations into the outdoor environment
Predictive methods for calculating the noise input/output of technological systems
Dimensioning noise mitigation systems according to the current regulatory and legislative regime

LIGHTING DESIGN

8. The human visual system (hint).

9. Photometry.
Fundamental photometric quantities.
Hints at photometric measurements.

10. Artificial light sources.
Incandescent lamps.
Gas discharge lamps.
LED systems.
Light fixtures.

11. Artificial lighting.
Artificial lighting of interiors.

12. Natural interior lighting.

13. Lighting of works of art.

14. Calculation of energy requirements for lighting in buildings.

EXERCITATIONS

15. Acoustics exercise: Measurement of pressure and sound power levels, use of software for noise propagation in enclosed and free-field environments.

16. Lighting Engineering Exercise: Use of software for indoor workspace lighting design

Readings/Bibliography

R. Spagnolo (a cura di), Manuale di acustica applicata, De Agostini Scuola - Città Studi Edizioni, Torino (2008).

G. Forcolini INTERIOR LIGHTING, SORGENTI LUMINOSE, APPARECCHI, SISTEMI, IMPIANTI, PER PROGETTARE E REALIZZARE L'ILLUMINAZIONE DEGLI AMBIENTI INTERNI, Hoepli - Milano (2019).

Teaching methods

All the problems indicated in the Course contents will be discussed during the lectures. Lectures will be supplemented by numerical exercises in the classroom. Software for indoor and outdoor noise propagation, building energy diagnosis and lighting simulation will also be used

Assessment methods

The final examination consists of a written test and an oral interview, having as their subject the knowledge provided during the course. The written test usually consists of 8 questions, including 4 theory questions and 4 numerical exercises. To be admitted to take the oral test, a minimum score of 18/30 must be obtained in the written test. The oral test consists of an interview aimed at demonstrating the candidate's operational mastery and ability in relation to the key concepts explained during the course.
Students who demonstrate mastery and operational ability in relation to the key concepts illustrated in the teaching will be guaranteed to pass the exam. Higher marks will be awarded to students who demonstrate understanding and ability to use all the content of the teaching by illustrating it with language skills, solving even complex problems, and showing good operational ability. Failure to pass the exam may be due to insufficient knowledge of key concepts, lack of mastery of technical language.

Teaching tools

PC video projector and downloadable materials from the teacher website

Office hours

See the website of Luca Barbaresi