Reducing Compressor Noise While Considering System Interactions
نویسندگان
چکیده
Refrigerant compressors can be a primary noise source in residential air conditioning and heat pump systems. When evaluating the contribution of a compressor to the total noise, it is necessary to consider how the compressor couples to the condensing unit. Compressors typically couple to the condensing unit via three different types of noise paths. First, the compressor couples structurally to the base pan, refrigerant tubing, and electrical wiring. Also, the compressor is coupled acoustically to the system via the refrigerant gas in the tubing and condenser coils. Finally, sound waves radiating from the compressor housing interact with the acoustic environment in and around the condensing unit. Often, the most effective noise reduction solution addresses the coupling of the compressor to the system rather than the compressor as an exclusive noise source. This paper offers design guidance while summarizing the results of a program to reduce the sound and vibration of a residential air conditioning heat pump unit. An approach is demonstrated for reducing compressor noise while considering system interactions. Techniques are discussed for identifying and ranking the noise transmission paths. Results are presented of an experimental modal analysis conducted on the condensing unit cabinet. The modes of vibration that contribute to system noise are identified; and solution methods for alleviating the effects of the resonance modes are presented. Also, an approach is discussed for quantifying and reducing the contribution of discharge pressure pulsations to condensing unit noise.
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