The SBE Broadcast Engineering Handbook: A Hands-on Guide to Station Design and Maintenance by Jerry C. Whitaker

The SBE Broadcast Engineering Handbook: A Hands-on Guide to Station Design and Maintenance by Jerry C. Whitaker

Author:Jerry C. Whitaker [Whitaker, Jerry C.]
Language: eng
Format: azw3, pdf
Publisher: McGraw-Hill Education
Published: 2016-04-22T04:00:00+00:00


FIGURE 5.1.13 Cutaway view of a typical duct silencer.

Because the baffles in a silencer restrict the flow of air to a certain degree, the silencer can add to the static pressure against which the fan must work, so that the pressure-drop ratings of silencers can become an important consideration. Since the baffles generate a certain amount of turbulence in the airflow, silencers can generate a certain amount of noise. Silencers should be positioned so that the amount of attenuated noise leaving them is still higher than the generated noise of the silencers, which implies that the silencers should be placed relatively close to fans. On the other hand, it is good practice to locate silencers at least five duct diameters downstream of a fan in the supply-air system; otherwise noise generated by turbulent air, especially low-frequency noise, can greatly exceed the rated self-noise of the silencers. Placement of silencers in return-air systems is less critical, but a spacing of at least three duct diameters between fan and silencer is still advisable.



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