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Little research was carried out in the field of acoustic casings for HVAC equipment. In this study, we experimentally analyzed the influence of the casing geometry with regard to the acoustic environment. Two casings (cuboid shape and semi-cylindrical shape) were compared according to their experimentally assessed sound power level. The parameters calculated were the sound pressure and power levels...
Model cores based on amorphous SA1 and HB1 alloys for pole transformers were prepared and their audible noise was measured in terms of A-weighted sound power level in a hemi-anechoic chamber in accordance with ISO 3744 standard. The two amorphous cores annealed under optimum conditions to minimize the audible noise showed the same sound power level of 56 dB as M3 core at their typical operating flux...
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