Wind energy

Wind energy

Industry: Energy

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Wind energy

Darrieus rotor

Energy; Wind energy

Is a sleek vertical axis wind turbine developed by French inventor G. J. M. Darrieus in 1929 based on aerodynamic profiles.

The human ear is more sensitive to sound in the frequency range 1 kHz to 4 kHz than to sound at very low or high frequencies. Therefore, sound metres are normally fitted with philtres adapting the ...

Decibel (dB)

Energy; Wind energy

Is a unit of measurement that is used to indicate the relative amplitude of a sound or the ratio of the signal level such as sound pressure. Sound levels in decibels are calculated on a logarithmic ...

Direct drive

Energy; Wind energy

Is a drive-train concept for wind turbines in which there is no gearbox and the wind turbine rotor is connected directly to a low-speed electrical generator.

Direct employment

Energy; Wind energy

Is the total number of people employed in companies belonging to a specific sector.

Discount rate

Energy; Wind energy

Is the interest rate (in ) used to calculate the equivalent present-day costs or value of future expenditure or income.

Distributed generation

Energy; Wind energy

Means single or small clusters of wind turbines spread across the landscape, in contrast to the concentration of wind turbines in large arrays or wind power plants.