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WAHS Wind Energy #1
WAHS Wind Energy Vocabulary #1
| Question | Answer |
|---|---|
| airfoil | the shape of the blade cross-section, to enhance the lift and improve turbine performance |
| ampere-hour | a unit to measure quantity of electricity, also measures battery capacity |
| anemometer | a device to measure wind speed |
| average wind speed | the mean wind speed over a specified time period |
| blades | the aerodynamic surface that catches the wind |
| brake | a system used to stop the rotor from turning |
| converter/inverter | a device that converts direct current (DC) to alternating current (AC) |
| cut-in wind speed | the wind speed at which a wind turbine begins to generate electricity |
| cut-out speed | the wind speed at which a wind turbine ceases to generate electricity |
| density | mass per unit of volume |
| downwind | on the opposite side from the direction from which the wind blows |
| furling | a passive protection for the turbine where the rotors fold up or around the tail vane |
| grid | the electricity utility distribution system, connecting generators to users |
| HAWT | horizontal axis wind turbine |
| VAWT | vertical axis wind turbine |
| kW | kilowatt, a measure of power for electrical current (1000 watts) |
| kWh | kilowatt-hour, a measure of energy equal to the use of one kilowatt in one hour |
| MW | megawatt, a measure of power (1,000,000 watts) |
| nacelle | the body of a propeller-type wind turbine, containing the gearbox, generator, blade hub, and other parts |
| O&M costs | operation and maintenance costs |
| power coefficient | the ratio of the power extracted by a wind turbine to the power available in the wind stream |
| power curve | a chart showing a wind turbine's power output across a range of wind speeds |
| PUC | Public Utility Commission, a state agency which regulates utilities |
| PURPA | Public Utility Regulatory Policies Act, referring to small generator utility connection rules |
| rated output capacity | the output power of a wind machine operating at the rated wind speed |
| rated wind speed | the lowest wind speed at which the rated output power of a wind turbine is produced |
| rotor | the rotating part of a wind turbine, including the blades and blade assembly, or the rotating part of a generator |
| rotor diameter | the diameter of the circle swept by the rotor |
| rotor speed | the revolutions per minute of the wind turbine rotor |
| start-up wind speed | the wind speed at which a wind turbine will begin to spin |
| swept area | the area swept by the turbine rotor, A=pR2, where R is the radius of the rotor |
| tip speed ratio | dividing the speed at the tip of a moving rotor blade by the wind velocity |
| turbulence | the changes in wind speed and direction, frequently caused by obstacles |
| upwind | on the same side as the direction from which the wind is blowing (windward) |
| wind farm | a group of wind turbines, often owned by one company (aka "wind power plant") |
| yaw | the movement of the tower top turbine that allows the turbine to stay into the wind |
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