By Mark E. Schaffer
A advisor that offers principles for controlling the noise and vibration of HVAC structures.
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Additional resources for A Practical Guide to Noise and Vibration Control for HVAC Systems
The FC fan’s LW spectrum does not show a strong BPF tone, but its higher 63 hertz band LW value can be a problem because of the expense required to control noise in that frequency band. Centrifugal fans of all types will produce unexpectedly high noise levels if duct fittings or other airflow obstructions are too close to the fan inlet or discharge. The amount of excessive noise cannot be quantified; ongoing ASHRAE-sponsored research is attempting to quantify the effect for all types of fans. Figure 2-3 shows the current “best practice” guidelines for inlet clearance and discharge ductwork configurations for centrifugal fans.
For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. Airside Equipment Figure 2-20 Plenum AHU with supply ducts attached to the top of discharge plenum. Figure 2-21 Cutaway sketch of a plenum fan air-handling unit.
Built-Up Air-Handling Systems Because built-up air-handling systems typically use large, noisy equipment and handle very large air quantities, attention to noise and vibration control is required in all of the design phases, especially the early phases. General Guidelines for Built-Up Basement and Rooftop AHU Installations 1. Arrange the equipment and duct shaft locations for smooth airflow at the recommended velocity and pressure drop. 2. When two supply fans (centrifugal or vane-axial) are to operate in parallel, arrange them in a “Y” discharge arrangement as shown in Figure 1-12.
A Practical Guide to Noise and Vibration Control for HVAC Systems by Mark E. Schaffer