A Practical Guide to Noise and Vibration Control for HVAC by Mark E. Schaffer

By Mark E. Schaffer

A consultant that provides ideas for controlling the noise and vibration of HVAC platforms.

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Extra info for A Practical Guide to Noise and Vibration Control for HVAC Systems

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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 Figure 2-11 Power roof ventilators (mushroom fans) mounted on intake duct silencers and roof curbs. Since “add-on” noise control products, such as duct silencers or even ductwork, are often not feasible because of the static pressure losses that they create, selection of the quietest propeller fan available is often needed for a noise-sensitive application.

For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. General Design Guidelines Figure 1-19 Plan view of return air shaft with supply duct takeoffs obstructing return airflow. Construction Figure 1-20 generically compares the sound isolation performance of several shaft, chase, and enclosure constructions. In general, higher wall mass and larger clearances around ducts provide better sound isolation.

Figure 2-20 shows an external view of a plenum AHU with two top outlets with radius elbows that direct the supply air in opposite directions. This arrangement precludes the need for a T-split discharge fitting. Figure 2-21 shows a cutaway sketch of a blow-through plenum AHU. Fan-coil Units Motor hum from single-phase motors is a common noise problem in fan-coil units because this kind of motor is prone to high internal vibration, and because this type of motor is typically attached directly to the unit housing, which acts a sounding board for the motor’s vibration.

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