Calculation of Noise Level Due to Operation of Wind Turbine

NSR Location:

1 Tai Ling Tsuen

Horizontal Distance=

260

m

Vertical Distance=

60

m

Slant Distance=

267

Frequency, Hz

125

250

500

1000

2000

4000

SWL⁽¹⁾, dB(A)

85.6

92.2

95.5

94.1

89.9

84.4

Distance

267

Distance correction

-57

Screening correction

0

Atmospheric Absorption⁽²⁾

-0.1

-0.3

-0.7

-1.3

-2.4

-6.1

Predicted Lp

29

35

38

36

31

22

A-Weighting, dB

0.0

Lp, dB(A)

29.0

35.4

38.2

36.2

31.0

21.8

A-Wt Sound Pr. Level =

42.2

dB(A)

-1.3

#REF!

FACADE CORRECTION=

3

dB(A)

PREDICTED FACADE NOISE LEVEL AT NSR =

45

dB(A)

Note:

⁽¹⁾ Reference has been made on the Type Approval report of a typical 600 - 850kW class wind turbine with adjustment to

represent the worst case scenario of a maximum sound power level of 100dB(A). The sound power levels of the

wind turbine are measured in accordance with the Standard “The Danish Ministry of Energy Order No. 304 of 14 May

1991" and the guidelines from the Danish Environmental Agency's Laboratory. The report indicates that there are

no audible tones in the noise.

-2.4

⁽²⁾ Basing on ISO 9613:Part 2 for Atmospheric Absorption at 20°C and Relative Humidity 70%, with reference

made on the approved EIA for Construction of an International Theme Park in Penny’s Bay of North Lantau and its

Essential Associated Infrastructures, February 2000, ERM

#REF!