Industrial Noise & Vibration Centre

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Roof-Top HVAC – “chiller farm” air conditioning noise control at a 90% cost discount

Rooftop chiller fan noise attenuation

The cost of reducing the noise from air conditioning system chillers on the roof of a large multi-storey facility to meet the requirements of the Local Authority had been estimated at over £300,000. Fitting the proposed acoustic screens round the condensers would also have required considerable planning (closing streets and bringing-in cranes) and the proposed noise control measures and silencers would have reduced the cooling capacity of the HVAC system. We had a better idea…

The communications company involved approached us in the hope that we could provide a better alternative. A very careful analysis of the noise sources and layout of the air conditioning plant plus some lateral thinking resulted in an elegant solution involving a combination of engineering control at source, novel local acoustic treatments and the clever use of geometry. The result was a set of modifications that were easy to implement in convenient stages and provided a reduction in the condenser axial fan noise of c 15dB(A) at a cost of c £40,000 – and with no effect on the normal operation or the overall efficiency of the system unlike conventional noise barriers and silencers.