Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 101)

Chillers OptiChill Freecool
Chillers
101
Technical Manual : 7197700 v1.2.0 02_2013
Sound Data
Measurement of sound
data
All sound data quoted has been measured in the third-octave band limited values, using
a Real Time Analyser calibrated sound intensity meter in accordance with
BS EN ISO9614 Part 1 : 1995. The Global sound data quoted is valid for noise
emitted in the horizontal plane in all directions.
All Sound Power Levels quoted are calculated from measured sound intensity according
to BS EN ISO9614 Part 1 : 1995.
Sound Pressure Levels are calculated from sound power using the expanded
parallelepiped method according to BS EN ISO11203 : 1996.
Sound Directivity
The Global sound measurements quoted in the following tables do not incorporate any
directivity or denote any sound level heard at any given position surrounding the unit,
rather they represent the total sound level emanated from the unit in all directions in
the horizontal plane from source.
Using the adjustment factors from the map below, specific directional sound power levels
can be derived from the global sound power data.
Base Correction Values -
Global dB
-9
-4
-8
-4
EXAMPLE:
OFC091X22-87ML5
Overall Sound Power
= 97 dB(A) ie:
93dB(A)
89dB(A)
93dB(A)
88dB(A)