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Air conditioning external unit (chiller) SEA noise modelling

At the design stage of a new chiller and in order to achieve a possible noise reduction, it becomes necessary to study the emissions sources/causes and to separate the airborne radiation from the structure borne radiation (compressor vibration).

The existing CAD has been used to build a simplified SEA model from which the influence of the structure borne component have been identified. As a first result of the study, it was the inconsistency of increasing the mass of the insulation enclosure around the compressor, because the vibrational excitation would have neglected the theoretical result; in effect it was clear that a suitable damping material will give a much better noise reduction.
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