Norwegische Vorschrift, 2012 (Englisch): Difference between revisions
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The revised guideline is a combination of the Swedish guideline “Ljud från Vindkraftverk” from 2001 and the previous Norwegian guideline. It is also incompatible with the old guideline, which cannot simply be recalculated with the revised guideline. | The revised guideline is a combination of the Swedish guideline “Ljud från Vindkraftverk” from 2001 and the previous Norwegian guideline. It is also incompatible with the old guideline, which cannot simply be recalculated with the revised guideline. | ||
'''Calculation setup''' | '''Calculation setup''' | ||
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[[File:DE_UMWELT_DEC (5.1).png|600px]] | [[File:DE_UMWELT_DEC (5.1).png|600px]] | ||
'''Wind speed''' | '''Wind speed''' | ||
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In practice windPRO will consider the noise curve in the noise record selected for the turbine and pick the wind speed with the highest source noise level. | In practice windPRO will consider the noise curve in the noise record selected for the turbine and pick the wind speed with the highest source noise level. | ||
'''Octave data''' | '''Octave data''' | ||
Calculations within 1000 m of any turbine in the calculation can actually be calculated without octave data. However for wind farms larger than one turbine the 1000 limitation will almost certainly be exceeded and so octave band distributions are required. If the turbine noise record used does not hold octave data a generic distribution is fitted to the dBA value of the highest noise value. | Calculations within 1000 m of any turbine in the calculation can actually be calculated without octave data. However for wind farms larger than one turbine the 1000 limitation will almost certainly be exceeded and so octave band distributions are required. If the turbine noise record used does not hold octave data a generic distribution is fitted to the dBA value of the highest noise value. | ||
'''Meteorological coefficient C0''' | '''Meteorological coefficient C0''' | ||
Whereas the previous guideline advised an upwind reduction, the present guideline refuses this option. The meteorological coefficient should remain 0. | Whereas the previous guideline advised an upwind reduction, the present guideline refuses this option. The meteorological coefficient should remain 0. | ||
'''Offshore wind farm''' | '''Offshore wind farm''' | ||
In case of offshore wind farms this option is hatched. The methodology is the same as for the Swedish model and the calculation method is almost identical. | In case of offshore wind farms this option is hatched. The methodology is the same as for the Swedish model and the calculation method is almost identical. | ||
'''View period''' | '''View period''' | ||
The Norwegian codes operate with noise values as | The Norwegian codes operate with noise values as L<sub>den</sub>, where den is an abbreviation of day-evening-night. It represents a weighted average of noise, where noise during evening and night is penalized. The parameters can be seen or modified by pressing the Edit period button as seen below. | ||
The period definition of day, evening and night can be set here, as well as the penalty due for each period. | The period definition of day, evening and night can be set here, as well as the penalty due for each period. | ||
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[[File:DE_UMWELT_DEC (6).png|300px]] | [[File:DE_UMWELT_DEC (6).png|300px]] | ||
Because of the | Because of the L<sub>den</sub> calculation method different noise modes can be set for the turbines for day, evening and night and WindPRO will calculated the combined L<sub>den</sub>. If all periods use the same noise mode L<sub>den</sub> corresponds to Leq24 + 6,4dB. | ||
'''Noise limits''' | '''Noise limits''' | ||
Noise limits in Norway are governed by zoning. Dwellings receiving more than | Noise limits in Norway are governed by zoning. Dwellings receiving more than L<sub>den</sub> = 40 dB(A) must be calculated. The noise limit of the dwelling depends on the zone in which they are situated. | ||
The allowed noise impact is: | The allowed noise impact is: | ||
Yellow zone (Gul sone): | |||
Red zone (Rød sone): | Yellow zone (Gul sone): L<sub>den</sub> 45 dB(A) | ||
Red zone (Rød sone): L<sub>den</sub> 55 dB(A) | |||
The relevant zone can be selected in the noise receptor. | The relevant zone can be selected in the noise receptor. | ||
'''Alternative methods''' | '''Alternative methods''' | ||
The Norwegian guideline allows for noise to be calculated using alternative methods such as Nord2000, but fails to describe a methodology, essentially leaving it up to the noise consultant to decide how to do the calculation. | The Norwegian guideline allows for noise to be calculated using alternative methods such as Nord2000, but fails to describe a methodology, essentially leaving it up to the noise consultant to decide how to do the calculation. | ||
Revision as of 17:16, 4 January 2017
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The Norwegian guideline was in 2012 replaced by “Veileder til retningslinje for behandling av støy i arealplanlegging (T-1442/2012)”, which is described in document M-128 – 2014 from Miljødirektoratet.
The revised guideline is a combination of the Swedish guideline “Ljud från Vindkraftverk” from 2001 and the previous Norwegian guideline. It is also incompatible with the old guideline, which cannot simply be recalculated with the revised guideline.
Calculation setup
The calculation model is selected by choosing “Norwegian 2012” as Noise calculation model.
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Wind speed
The Norwegian guideline describes a complex method of adjusting 10 m/s with actual roughness along the line of the older Swedish guideline, however advise as a more practical solution that calculations are done at the highest source noise level regardless of wind speed. As the typical wind profiles in Norway are governed not by roughness, but by topography only the highest source noise level option is available in windPRO.
In practice windPRO will consider the noise curve in the noise record selected for the turbine and pick the wind speed with the highest source noise level.
Octave data
Calculations within 1000 m of any turbine in the calculation can actually be calculated without octave data. However for wind farms larger than one turbine the 1000 limitation will almost certainly be exceeded and so octave band distributions are required. If the turbine noise record used does not hold octave data a generic distribution is fitted to the dBA value of the highest noise value.
Meteorological coefficient C0
Whereas the previous guideline advised an upwind reduction, the present guideline refuses this option. The meteorological coefficient should remain 0.
Offshore wind farm
In case of offshore wind farms this option is hatched. The methodology is the same as for the Swedish model and the calculation method is almost identical.
View period
The Norwegian codes operate with noise values as Lden, where den is an abbreviation of day-evening-night. It represents a weighted average of noise, where noise during evening and night is penalized. The parameters can be seen or modified by pressing the Edit period button as seen below.
The period definition of day, evening and night can be set here, as well as the penalty due for each period.
.png)
Because of the Lden calculation method different noise modes can be set for the turbines for day, evening and night and WindPRO will calculated the combined Lden. If all periods use the same noise mode Lden corresponds to Leq24 + 6,4dB.
Noise limits
Noise limits in Norway are governed by zoning. Dwellings receiving more than Lden = 40 dB(A) must be calculated. The noise limit of the dwelling depends on the zone in which they are situated.
The allowed noise impact is:
Yellow zone (Gul sone): Lden 45 dB(A)
Red zone (Rød sone): Lden 55 dB(A)
The relevant zone can be selected in the noise receptor.
Alternative methods
The Norwegian guideline allows for noise to be calculated using alternative methods such as Nord2000, but fails to describe a methodology, essentially leaving it up to the noise consultant to decide how to do the calculation.