| Calculation of Noise Level Due to
Operation of Wind Turbine |
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| NSR Location: |
2 Tai
Ling Tsuen |
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| Horizontal Distance= |
313 |
m |
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| Vertical Distance= |
65 |
m |
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| Slant Distance= |
320 |
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| Frequency,
Hz |
125 |
250 |
500 |
1000 |
2000 |
4000 |
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| SWL(1), dB(A) |
85.6 |
92.2 |
95.5 |
94.1 |
89.9 |
84.4 |
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| Distance |
320 |
320 |
320 |
320 |
320 |
320 |
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| Distance correction |
-58 |
-58 |
-58 |
-58 |
-58 |
-58 |
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| Screening correction |
-5 |
-5 |
-5 |
-5 |
-5 |
-5 |
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| Atmospheric Absorption(2) |
-0.1 |
-0.4 |
-0.9 |
-1.6 |
-2.9 |
-7.3 |
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| Predicted Lp |
22 |
29 |
32 |
29 |
24 |
14 |
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| A-Weighting, dB |
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| Lp, dB(A) |
22.4 |
28.8 |
31.5 |
29.4 |
23.9 |
14.0 |
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| A-Wt Sound Pr. Level = |
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35.4 |
dB(A) |
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FACADE CORRECTION= |
3 |
dB(A) |
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| PREDICTED
FACADE NOISE LEVEL AT NSR = |
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38 |
dB(A) |
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| Note: |
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| (1) Reference has been made on the Type Approval report of a typical
600 - 850kW class wind turbine with adjustment to |
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| represent the
worst case scenario of a maximum sound power level of 100dB(A). The sound power levels of the |
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| wind turbine are measured in
accordance with the Standard “The
Danish Ministry of Energy Order No. 304 of 14 May |
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| 1991" and the guidelines from the
Danish Environmental Agency's Laboratory. The report
indicates that there are |
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| no audible tones in the noise. |
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| (2) Basing on ISO 9613:Part 2 for Atmospheric Absorption at 20°C and
Relative Humidity 70%, with reference |
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| made on
the approved EIA for Construction of an
International Theme Park in Penny’s Bay of North Lantau and its |
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| Essential
Associated Infrastructures, February 2000, ERM |
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174 |
751 |
1416 |
872 |
247 |
25 |
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