By Mark E. Schaffer
A consultant that offers principles for controlling the noise and vibration of HVAC platforms.
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Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. A Practical Guide to Noise and Vibration Control for HVAC Systems b. c. d. 6. For downward noise control, use a building standard slab with a gypsum board ceiling suspended below using spring hangers (see Figure 1-7). The suspended ceiling is also an alternative to an equipment enclosure for upward noise control, but it can be difficult to implement where the room has a lot of suspended piping and conduits.
This section of the guide deals specifically with the selection of fans in all of their likely applications. The acoustical performance of AHUs is addressed later in this chapter. The first step in selecting a fan for a noise-sensitive application is to select the quietest equipment available for the most likely operating condition. , airflow and system static pressure. In variable air volume (VAV) systems, the selection should be made for the most likely range of part-load operating conditions (typically in the range from 60% to 85% of full capacity).
Figure 1-9 Sound transmission at perimeter mechanical rooms. --``,,`,``,```,,`,,```````,,`,,,-`-`,,`,,`,`,,`--- Figure 1-8 12 © 2011 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. b. Electrical conduits serving central plant equipment should not penetrate a floor or ceiling slab that is common to a noise-sensitive area.
A Practical Guide to Noise and Vibration Control for HVAC Systems by Mark E. Schaffer