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Sound Attenuation for HVAC Ducts Using Porous Absorbers of Different Sound Absorption Coefficient
Sachin S. Gurav,  Sachin S. Mestry
Sound attenuation is done by active sound attenuator or by passive sound attenuator. In case of active sound attenuation the anti-noise source is used to reduce the intensity of noise however, in passive sound attenuation various types of sound absorbing porous materials are used to absorb sound energy. In passive sound attenuators the substantial portion of the mechanical pressure wave penetrates to the pores before encountering to the solid surface. Large number of interactions takes place and the energy is transferred to the solid structure through the frictional losses and the sound intensity is reduced. Passive sound attenuator is used in Heating Ventilation and Air Conditioning (HVAC) duct to reduce the sound produced by the blower. Two porous materials of different sound absorbing coefficients are used in the attenuator. This passive attenuator is specifically designed to study the effect at low sound frequency. Frequency of sound is measured with the help of Lab VIEW software. Intensity of sound is measured using digital decibel (dB) meter. To measure the pressure drop digital anemometer is used. Along with the combination of porous materials the effect of thickness of porous absorber and the angle of porous absorbers with the direction of air stream is studied.
Keywords- Sound Absorption Coefficient, Porous Materials, Low Frequency sound, blade pass frequency, HVAC sound attenuation and pressure drop.
Unique Identification Number - IJEDR1403064Page Number(s) - 3207-3213Pubished in - Volume 2 | Issue 3 | Sept 2014DOI (Digital Object Identifier) -    Publisher - IJEDR (ISSN - 2321-9939)
Cite this Article
Sachin S. Gurav,  Sachin S. Mestry,   "Sound Attenuation for HVAC Ducts Using Porous Absorbers of Different Sound Absorption Coefficient"
, International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.2, Issue 3, pp.3207-3213, Sept 2014, Available at :http://www.ijedr.org/papers/IJEDR1403064.pdf