Airedale EasiCool 6kW 64kW - Manual (Page 31)

EasiCool™ Precision Air Conditioning
Sound Measurement Method
Measurement Of Sound Power
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.
All Sound Power Levels quoted are calculated from measured sound intensity according to BS EN ISO9614 Part 1:1995.
SEMI HEMISPHERICAL
Sound Pressure Levels are calculated from sound power using the semi-hemispherical method where the noise source
is in junction with 2 boundaries i.e. the floor and 1 wall.
FREE FIELD
For comparison, the semi hemispherical figures can typically be reduced by 3dB to provide free field conditions.
(2)
(3)
(1)
(1)Return Air
(2)Case Breakout
(3)Discharge Air
(1)
(2)
(3)
(1) Return Air
(2) Case Breakout
(3) Discharge Air
IMPORTANT
The sound data quoted is based on the unit having a ducted return air, ducted (or underfloor) discharge air and standard
forward curved fan and EC motors fitted, refer to illustration below.
Case breakout sound data is therefore independent of the discharge air and return air sound data.
For non-ducted return air applications, the overall case breakout sound levels may increase, due to the return air sound
being predominant.
Within the conditioned space, sound from in-room ducted discharge air grilles and other equipment will contribute to the
overall sound level and should therefore be considered as part of sound calculations.
Specialist acoustic advice is recommended for noise critical applications.
31 EasiCool Technical Manual 7535776 V1.1.0_04_2013
Introduction