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

1. Physical acoustics.
The nature of sound. Main acoustic quantities.
Sound speed in various media.
Plane, spherical, cylindrical, standing waves.
2. Psychoacoustics (introduction).
Human hearing system.
Annoyance and damage due to noise.
3. Sound levels, decibels and spectra.
Decibel scale.
(1/n) octave filters.
Frequency weighting curves.
Sound levels metrics.
Sound level meters.
Fourier analysis (introduction).
4. Outdoor noise.
Sound propagation outdoors.
Laws and standards.
5. Building acoustics.
Sound insulation: basic laws.
Laws and standards.
6. Room acoustics.
Geometric approximation.
Statistic-energetic approximation. Reverberation.
Sabine and Norris-Eyring formulae for the reverberation time.Sound absorbing materials and systems.
7. Service equipment noise
Determination of sound power levels of noise sources;
design the noise reducing devices according to the standards and laws

LIGHTING
8. The human vision system (introduction).9. Photometry.Fundamental photometric quantities.
Basic photometric measurements.
10. Artificial light sources.
Hot wire lamps.
Gas discharge lamps.
LED systems.
Lamp enclosures.
11. Artificial lighting.
Artificial lighting in interiors.
12. Using natural light in interiors.
13. Lighting of artworks.
14. Energy performance of buildings - Energy requirements for lighting

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

During the lessons all the contents of the course will be treated. The lessons will be complemented by numerical exercises.

Software will also be used for the propagation of noise in indoor and outdoor environments, for the energy performance of buildings and for lighting simulation.

Assessment methods

The final exam consists of a written test and an oral part, dealing with the notions presented during the course. The written session usually consists of 8 questions, 4 theoretical questions and 4 numerical ones. In order to be eligible to take the oral exam, the student must score in the written test a minimum total of 18/30 points. The oral session consists of a technical conversation aimed at evaluating the organic understanding of the subject with reference to the key concepts illustrated during the course.

Higher grades will be awarded to students who demonstrate an organic understanding of the subject, a high ability for critical application, and a clear and concise presentation of the contents.
To obtain a passing grade, students are required to at least demonstrate a knowledge of the key concepts of the subject, some ability for critical application, and a comprehensible use of technical language.
A failing grade will be awarded if the student shows knowledge gaps in key-concepts of the subject, inappropriate use of language, and/or logic failures in the analysis of the subject.

Teaching tools

PC projector, materials downlodable from the teacher's website

Office hours

See the website of Luca Barbaresi