A low noise duct ventilation using C- transition curve design

Or, , Khai Hee (2013) A low noise duct ventilation using C- transition curve design. Project Report. UTeM, Melaka. (Submitted)

PDF (24 Pages) CDR_10212-_24_Pages.pdf - Submitted Version Download (333kB)

Abstract

In the buildings, ventilation contributes to unwanted noise as the result of the interaction between the outlet air flow and the ventilation fins structure. The noise is caused by turbulence flow especially at high air flow velocity. In order to ensure a comfortable living and working environment, it is important to reduce the radiated noise level by reducing the turbulence flow. An analysis on C-Transition Curve is investigated here by means of Computational Fluid Dynamics (CFD) to identify its effect on reducing the turbulence. The C-Transition Curve is generated from mathematical calculation of parametric equation. A simple C-Transition Curve of outlet duct ventilation model is designed for this purpose. Analysis is also conducted on a semicircle shape of duct ventilation without mathematical calculation as a comparison. Finally, simple C-Transition Curve duct ventilation is fabricated to validate the results from the analysis through experiment in a wind tunnel. It is found that the structure with C-Transition Curve can reduce the output noise level at high frequency.

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