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How do I stop my air conditioner fan from making noise? 

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Vortex shedding can be a significant source of noise when the fan is operated in a lightly loaded condition.
The high temperature set point of air conditionings should be raised and the fan power should be reduced.
Therefore, the noise observeda way from a low pressure axial flow fan is mostly the turbulent noise.
The results show that under the abnormal condition, fan performance is lower than normal value and the noise rises.
Proceedings ArticleDOI
R.H. Lyon, A.E. Bergles 
09 Mar 2004
9 Citations
This noise may have both tonal and random components and is strongly dependent on the way that the fan is placed in the unit and on how close its operation is to the design operating point.
The multiple regression analyses indicated that the total subjective annoyance caused by air-conditioner noise can be predicted using the delay time and amplitude of the first maximum peak of the ACF (τ 1 and ϕ 1 ) and the SD of ϕ 1 .
The noise emission from the household refrigerator is also found to be lessened when the new fan units are installed.
A comparative study shows that the potential acoustic shielding effect is less favourable to the jet noise than to the downstream fan noise.
Open accessProceedings ArticleDOI
11 May 2009
12 Citations
The knowledge gained in this work provides a basis for improved fan source specification in overall aircraft system noise studies.
Acceptable limits for air conditioner noise levels can be derived from the dose response curves produced in this study.

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