Abstract
There has been a surge in the building of multimillion dollar homes along the California Coast. Often, large commercial style air conditioners are installed with multiple axial flow propeller condenser fans. They can generate low-frequency tones that annoy highly sensitive neighbors. By replacing 3- to 4-bladed stamped metal fans with a 6-, 9-, and 12-bladed highly efficient airfoil fan with pitch compensation, by reducing motor speeds from 1140 to 870 rpm, and by installing a variable speed controller, sound levels were reduced 14 dB @ 77 Hz as well as reducing energy consumption. This noise reduction solutions have proven to be far more effective than traditional barriers.
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