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Ljudreduktion hos ventilationsdon; Ingenjörsmässig beräkningsmetod för uppskattning av ljudreduktion hos ventilationsdon
KTH, School of Engineering Sciences (SCI).
KTH, School of Engineering Sciences (SCI).
2019 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Sound reduction of ventilation devices; Calculation method for engineering to approximate sound reduction of ventilation devices (English)
Abstract [sv]

Det finns ett flertal faktorer som påverkar arbetsmiljö och en viktig aspekt är ljudmiljön. För att sträva efter en behaglig ljudnivå och undvika buller finns det många lösningar; ljudisolera väggar, alternativt montera absorbenter. I kontorslandskap kan överhörinng via ventilationssystem vara ett problem. Det här arbetet avser att utvärdera ventilationsdons ljudreduktionsförmåga från rum till kanal genom att ta fram en praktisk lämpad beräkningsmodell. Beräkningsmodellen verifierades med mätningar i laboratoriemiljö. Mätningarna var utformande så att de efterliknade vanligt förekommande monteringar av ventilationsdon; olika placeringar av kanalmynningen gentemot en vägg och liknande då de är monterade vid ett undertak. Den utvärderade beräkningsmodellen återfinns i SS-EN 12354-5 2009, och ansågs att kunna ge ett riktningsvärde för praktisk användning. Teoretiskt är den ej optimal och ytterliggare efterarbete krävs.

Abstract [en]

There are several factors that affects the work environment and one important aspect is the sound environment. When striving for a comfortable sound level and avoid noise there are many solutions; sound isolating walls, alternatively mounting absorbents. In offices, cross-talk via ventilation system can be a problem. This study intends to evaluate ventilation devices' ability to reduce sound, from a room to a duct, by derive a model suited for practical use. The model was verified by measurements in a laboratory. The measurements were designed to imitate how ventilation devices is commonly mounted; different placements of the duct opening in relation to a solid wall and similar when mounted on a ceiling of absorbents. The derived model can be found in SS-EN 12354-5 2009, and it was considered to provide a value for practical use. Theoretically, the model is not optimal and more work is required.

 

Place, publisher, year, edition, pages
2019.
Series
TRITA-SCI-GRU ; 2019:185
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-254818OAI: oai:DiVA.org:kth-254818DiVA, id: diva2:1335468
External cooperation
Tyréns
Supervisors
Examiners
Available from: 2019-07-05 Created: 2019-07-05 Last updated: 2019-07-05Bibliographically approved

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