Noise White Paper Outline - Minuteman Wind, LLC
Noise White Paper Outline - Minuteman Wind, LLC
Noise White Paper Outline - Minuteman Wind, LLC
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designers’ efforts to address noise issues in the 1990’s and later have resulted insignificantly quieter wind turbines than the initial designs of the 1980’s.130sound power level dB[A]1201101009080's90'sSWT's00'sLog. (80's)Log. (90's)sound power level = 22 LOG(D) + 72sound power level = 11 LOG (D) + 8280701 10 100 1000Diameter [m]Figure 13: Sample wind turbine measured sound power levelsCommunity Standards for Determining Acceptable Sound Pressure LevelsAt the present time, there are no common international noise standards or regulations forsound pressure levels. In most countries, however, noise regulations define upper boundsfor the noise to which people may be exposed. These limits depend on the country andmay be different for daytime and nighttime.For example, in Europe, as shown in Table 2, fixed noise limits have been the standard[Gipe, 1995].Country Commercial Mixed Residential RuralDenmark 40 45Germany(day) 65 60 55 50(night) 50 45 40 35Netherlands(day) 50 45 40(night) 40 35 30Table 2: <strong>Noise</strong> Limits of Sound Pressure Levels, L eq (in dB(A)) in VariousEuropean Countries<strong>Wind</strong> Turbine <strong>Noise</strong> Issues Renewable Energy Research Laboratory Page 21