Issues on the evaluation of low frequency noise emitted by wind turbines

The new European Directive "Road map for low carbon economy to 2050" shows the way to improve the energy efficiency and the renewable sources play a fundamental role to fulfill this goal. Despite wind energy is one of the most efficiency renewable energy, the wind farms' design require an accurate environmental impact assessment, due to noise emission and of visual intrusion on landscape. In particulary, low frequencies components of wind turbine noise are recently indicated as one of the possible main causes of noise annoyance. In this work issues about annoyance evaluation are pointed out, taking into account legal requirements, administrative procedures and technical approach for noise control.