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The impact of the damper blade position on the generated noise and pressure losses in plenum box with swirl diffusers

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The article presents the effect of setting the throttle in the plenum box with swirl diffuser on the generated noise and the pressure losses. The sound power levels of the source was determined using the precision method in the reverberation room in accordance with the PN-EN ISO 3741:2011 standard. The examination was carried out for damper blade position set vertically and horizontally for full opening and at a 45 degree angle in both directions. In order to confirm the universality of the conducted experiment, the tests were carried out for two different face swirl diffuser with different shapes of air control blades and holes in the plate and for different flow rates. The multi-criteria optimization methods were used to select the best throttle position.
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Bibliogr. 7 poz., il. kolor., fot., rys., wykr.
  • Institute of Power Engineering - Thermal Technology Branch "ITC" in Lodz, 113 Dabrowskiego Street, 93-208 Lodz, Poland,
  • Institute of Power Engineering - Thermal Technology Branch "ITC" in Lodz, 113 Dabrowskiego Street, 93-208 Lodz, Poland,
  • 1. PN-N-01307:1994, Noise - Limit values for noise in the work environment - Requirements for performing measurements. (PN-N-01307:1994, Hałas - Dopuszczalne wartości hałasu w środowisku pracy - Wymagania dotyczące wykonywania pomiarów).
  • 2. ASHRAE Handbook, HVAC Applications (SI), Chapter 48, Sound and Vibration Control, American Society of Heating, USA, 2011.
  • 3. Siemens Building Technologies, Minimizing Excessive Sound in Ventilation System Design, USA, 2009.
  • 4. Ramalingam, Srinivasan, Simulation and experimental validation of airborne and structure-borne noise transmission in hvac plenums, Theses and Dissertations - Mechanical Engineering, 2012.
  • 5. F. Qin, J. Chen, Z. Chen, Acoustic characterization and prediction for fan-duct-plenum-room integrations, Applied Acoustics, 67(3) (2006) 201 - 229.
  • 6. PN-EN ISO 3741:2011, Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms.
  • 7. M. Ostwald, Basics of design optimization, Poznań University of Technology Publishing House, Poznań, 2005. (M. Ostwald, Podstawy optymalizacji konstrukcji, Wydawnictwo Politechniki Poznańskiej, Poznań, 2005).
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