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ARTUS™ Technical Manual 9690348 v3_04_2020
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Quick Selection - Section C - Acoustics
Assessment without an Acoustic Consultant
For projects that do not have an acoustic consultant the following estimations are provided. This is a less precise
approach than using an acoustic consultant.
These estimates are for a number of typical case study scenarios. The NR figures have been calculated for each case
by an acoustic consultant and the input data is shown. Other projects will differ from this but the case study scenarios
give a guide to the figures that could be expected. Noise ratings (NR) have been calculated for various scenarios,
assuming that the Artus units are the only source of noise.
1. Commercial offices, both with a false ceiling and with exposed units.
i.
Open plan, south perimeter (cooling load 87W/m²) and BCO control zone 6m wide x 4.5m deep, 27m² floor
area.
ii.
Open plan, south perimeter (cooling load 87W/m²) and smaller control zone 4.5m wide x 4.5m deep, 20.25m²
floor area.
iii.
Cellular office, south perimeter (cooling load 87W/m²) office 3m wide x 4.5m deep, 13.5m² floor area.
iv.
Open plan, internal zone (cooling load 44W/m²), control zone 9m x 4.5m, 40.5m² floor area.
2. Residences
i.
Residential ‘penthouse’ living room of 24m², with one Artus in the room.
ii.
Residential ‘penthouse’ bedroom of 14.2m², with one Artus in the room.
iii.
Central London Residential living room (very quiet) of 22m², with one Artus in the room.
iv.
Central London Residential bedroom (very quiet) of 12m², with one Artus in the room.
The factors used in the scenarios include:
1. Sound level data (including directivity) obtained in an acoustics test facility at specific duty points.
2. The sound from both the discharge and the inlet sides of the unit have been taken into account. Where a false ceiling
is present, the noise from the inlet sides is largely absorbed by the ceiling, but for exposed units the noise from the inlets
is significant.
3. Acoustic characteristics – finishes (carpet, walls, ceiling), reverberation time.
4. Maximum cooling or heating load (W/m
2
), unit air flow (l/s), total unit SWL, calculated NR.
The data from 4 above is shown as a point on the graph. In addition to this a line has been added to show the variation
of NR with different airflow rates.
The acoustic design criteria for the different space types, based on industry standards, are also shown.
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