3 Terms
Contributors in Wind energy
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.
DB(A)
Energy; Wind energy
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.
