CHAPTER 48. NOISE AND VIBRATION CONTROL
The noise levels of outdoor chillers and condensing units are primarily used to determine compliance with local noise ordinances at property lines and to predict
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Possible cures for this type of noise include change in trim design or capacity, reduction of guide clearances, larger stem sizes, change in plug mass, and some times reversal of flow direction.
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Noise in a transformer is basically caused by magnetostriction. This translates into a hum of twice the applied frequency. This inherent characteristic of the transformer cannot be completely eliminated.
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CHAPTER 48. NOISE AND VIBRATION CONTROL
When applying the levels specified in Table 1 as a basis for design, sound from non-HVAC sources, such as traffic and office equipment, may establish the lower limit for sound levels in a space.
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CHAPTER 48. NOISE AND VIBRATION CONTROL
System analysis for noise control uses the source-path-receiver concept. The source of the sound is the noise-generating mechanism. The sound travels from the source via a path, which can be through
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Noise floor Noise at the receiver is commonly referred to as the receiver noise floor. There are many sources of unwanted signals which add up along the entire
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Used on very high pressure ratio applications (usually > 10 to 1), where the 2-stage drilled cage design cannot provide acceptable noise levels and/or some trim velocity limitations are required.
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There are no recommended adjustments for an analyzer which fails the Noise Floor Performance Test. If a phase lock lost error occurs during the test, performing a source adjustment may help if the source