Analysis and Improvement of Abnormal Noise in Dual Cold Source Fresh Air Dehumidifier
In response to feedback from after-sales service,a certain type of household dual cold source fresh air dehu-midifier encountered noise problems during operation,such as high noise from the living room return air outlet,low-fre-quency "buzzing" sound from the unit's sheet metal,and slight low-frequency resonance sound,measured on-site radiated noise and sheet metal vibration acceleration data using the 2250 handheld vibration and noise tester produced by Brüel&Kjær company in Denmark,using basic knowledge of acoustics,vibration,and subjective evaluation to ana-lyze the root causes of problems and propose corresponding vibration and noise reduction solutions:① The root cause of the high noise in the living room return air duct is that the construction party did not install a sound-absorbing duct sec-tion,which reduced the noise value by 10 dB (A) after installation;②The root cause of the low-frequency buzzing sound in the sheet metal of the unit is the imbalance of the fan caused by the failure of the fan components. After replacing the fan,the vibration response decreased by about 40％;③ The root cause of slight resonance sound lies in the resonance of the lifting system. After changing the fan speed,the resonance disappears and the sound quality is acceptable.
dual cold source fresh air dehumidification unitvibration and noise reductionsubjective sound quality evaluation
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