PDF HVAC Acoustic Fundamentals

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Course Introduction. When the sound is at acceptable levels, then the requirements for acoustical comfort are satisfied. There are many sources of sound in buildings: voices, human activities, utility equipments and external noises such as traffic and machinery. Building services such as plumbing, elevators, lighting, or heating, ventilation, and air conditioning HVAC systems can generate excessive noise inside the building.

HVAC equipment may constitute a major noise source which may include the boiler or mechanical room, as a result of the component operation i. The goal of noise control in buildings is to achieve an appropriate sound level for different rooms. What is appropriate depends on the type of activities expected to occur within the room and the level of speech intelligibility or acoustical privacy required.

The best way to avert noise problems is to review the mechanical system plans and building layout drawings with a qualified acoustical consultant before installation.

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This would help spot trouble and trigger a more thorough analysis to prescribe noise control treatment. This course attempts to cover these aspects. Course Content. You need to open or download this document to study this course. Course Summary. Theoretically, it takes a difference of 10 decibels to double the loudness. Also it takes approximately 3 decibels for the average human ear to discern any difference in loudness at all.

In many cases, the sound rating isn't as significant a determiner of sound difference to listeners as is the sound characteristics or quality. One type of sound with a lower sound power rating may be more offensive than another with a higher sound power rating. There are other important considerations, such as location, when considering the effects of sound.

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Both the noise coming out the diffusers and that leaking through ceilings from ducts and components above must be considered. Sometimes there are problems with turbulence causing duct vibration, or improper vibration isolation of fans or other equipment. Some basic considerations for a quiet design of HVAC systems include: minimizing pressure loss within ducts, selecting of fans that operate at maximum efficiency on performance curves while providing necessary ventilation, and designing ductwork leading to fans to minimize turbulence.

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If the sound power of a fan is too large, attenuation must be introduced immediately after the fan to prevent unacceptable noise passing along the system. Attenuation can be provided by vibration isolation, lining the ducts with absorptive material or by the attenuator units.

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Generalities on noise control in plants and on the acoustic correction of rooms. Fundamentals, requirements and evaluation methods of visual comfort.

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Environmental requirements and technologies for the artificial lighting. Types of light sources and lighting fixtures. Simplified methods for the calculation of artificial lighting. The LEMI indicator. Exercises Application of the hourly simplified method of ISO Sizing and design of the HVAC systems of a case study. Calculation of the energy consumption of a case study.

Application of an acoustic simulation tool for the calculation of passive acoustic requirements of buildings. Application of a lighting simulation tool for the design of an artificial lighting system. The lesson consists of about 40 hours of theoretical lessons and 20 hours dedicated to application tutorials for carrying out a design exercise.

This exercise, conducted in groups of 3 to 4 students, deals with the thermal design air conditioning and energy consumption calculation , acoustic acoustic passive requirements and lighting artificial lighting of a case study provided by the teacher. The design exercise is carried out through numerical calculations made on spreadsheets or through simulation tools energy, acoustic, lighting and graphic representations engineering schemes of principle, etc.

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Texts, readings, handouts and other learning resources. Presentations will be made available to students. References to literature and legislation, as well as those relating to the industrial production of components and systems technology will be provided. Stefanutti a cura di , Manuale degli impianti di climatizzazione, Tecniche Nuove in particolar, chapters 6, 7, 8, 9, 10, 12, Corrado, E. Filippi, E. Fabrizio a cura di , Introduzione alla simulazione termoenergetica dinamica degli edifici, Editoriale Delfino, Achieved learning outcomes will be assessed by means of a final exam consisting of two tests.

In order to be admitted to the final exam, the design exercise and the preparation of a "technical dossier" written by each student are required. In the technical dossier, technical data sheets of the components for air conditioning, lighting and noise control discussed during the lessons have to be collected. The exam consists of two tests. A first open written questionnaire consisting of 4 open questions for 1.

It is not permitted to consult any document during the written test. The written test is intended to test the knowledge of the lessons learned during the course. In particular the following aspects are evaluated: - content and depth of the answer; - terminology correctness and property of the answer.

The oral test usually after the written test, and on the same day consists in discussing the design exercise and the technology book, as well as in comments on the written test results. The oral test is intended to verify the ability to link to link between the various knowledge and their application in a professional context.