The air-cooled water chiller performing for a commercial building is placed at the garden of the building, very close to neighbourbood dwellings. The system operates depending on the needs, in a non-predictable regime and it became a nuisance to the neighbourhood, especially in summer time. Measurements held while the system was on showed that, noise created by the cooling system was high enough to be clearly perceptible and disturbing. An acoustic enclosure is designed in order to reduce the sound propagation, however as fans need air circulation, a semi-close structure was inevitable. The enclosure consists of concrete panel elements on a metal frame construction. To avoid noise increase due to internal reflections, interior of the enclosure is covered with synthetic grass. Measurements repeated after the treatment has shown that required reduction values are held.
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