Air Handling Unit x 10
The modelled air handling unit was modelled using horizontal and vertical area sources for the casing and of the unit and a horizontal area source for the air intake to the air handling unit.
The Lw of the casing, represented by vertical and horizontal area sources forming a box, was calculated as per the Transformer Bank and Converter Cooling Fan Banks above.
The air Intake was directly modelled as per the supplier Lw as an area source 300mm above the Casing of the unit as per supplier drawings.
The input Lw to match the 70 dB(A) Lw for the Casing unit and 82 dBA Lw for the intake is presented in Table 5.
Area Source
Air Handling Unit Casing
Air Handling Unit Intake
Octave Band (Hz) Sound Levels (dBA)
31.5 63 125 250 500 1000 2000 4000 8000 - 65.6 65.4 58.3 55.9 55.3 47.1 41.5 32.7
- 71.8 74.9 76.4 75.8 73.0 58.2 55.0 46.9 Table 5 Model Inputs for Air Handling Units 1.4.4 Assessment Results
The results of the CadnaA predictions based on the Lw calculated through the methodology above were compared to project criteria. The results of this assessment are presented in Volume 3, Chapter 26 of the Environmental Statement.
Broadband Total (dBA)
69.3 81.7
EAOW Noise Prediction Methodology P41388
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