Wind Poster - Revision history

Tammma at 18:28, 12 August 2005

2005-08-12T18:28:50Z

← Older revision		Revision as of 18:28, 12 August 2005
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	* Wind turbines turn by a combination of lift and drag, very similarly as airplane wings. When the wind passes over the blade it creates a localized low pressure area behind the blade. The blade is then pulled into this area. This is called lift. The push of the wind on the blade is drag. The force of lift is significantly stronger than that of drag. The combination of lift and drag cause the rotor to turn and turns a drive shaft. The drive shaft in turn, turns the generator, creating electricity.		* Wind turbines turn by a combination of lift and drag, very similarly as airplane wings. When the wind passes over the blade it creates a localized low pressure area behind the blade. The blade is then pulled into this area. This is called lift. The push of the wind on the blade is drag. The force of lift is significantly stronger than that of drag. The combination of lift and drag cause the rotor to turn and turns a drive shaft. The drive shaft in turn, turns the generator, creating electricity.
	* HAWT vs. VAWT		* HAWT vs. VAWT
	** Horizontal Axis Wind Turbines, or HAWTs, make up 95% of all wind machines in the world. The blades look like airplane propellers~~. There can be 1~~, 2, or 3 blades ~~on a~~ tower. Most commonplace are 2 or 3 blades because the blades balance each other and minimize torque.		** Horizontal Axis Wind Turbines, or HAWTs, make up 95% of all wind machines in the world. The blades look like airplane propellers and one, two, or three blades are generally located per tower. Most commonplace are 2 or 3 blades because the blades balance each other and minimize torque.
	** Vertical Axis Wind Turbines, VAWT, have much higher strain on rotors because of the guy wires needed to keep it erect. They also can't be placed on higher towers to take advantage of the more stable winds. There are different styles of VAWT, but all experience the same problems.		** Vertical Axis Wind Turbines, VAWT, have much higher strain on rotors because of the guy wires needed to keep it erect. They also can't be placed on higher towers to take advantage of the more stable winds. There are different styles of VAWT, but all experience the same problems.
	*** VAWT picture -- http://www.memagazine.org/backissues/jun04/features/apptowind/30topc.jpg HAWT picture -- http://www.bergey.com/images/Excel.CEC.jpg		*** VAWT picture -- http://www.memagazine.org/backissues/jun04/features/apptowind/30topc.jpg HAWT picture -- http://www.bergey.com/images/Excel.CEC.jpg
	* Wind Prospecting		* Wind Prospecting
	** Before a wind farm is set up, prospecting must be done. Anemometers are set up to determine the average wind speed. For a wind turbine to be practice, the general consensus is the average wind speed is greater than 12 mph.		** Before a wind farm is set up, prospecting must be done. Anemometers, a device to determine wind speed, are set up to determine the average wind speed. For a wind turbine to be practice, the general consensus is the average wind speed is greater than 12 mph.

	Power		Power
	* Power available works as a CUBE of the amount of wind present. In general a site needs to have average wind speeds of over 5m/s (11mph) for cost effective generation. Stronger less turbulent wind is 30 m above the ground and higher. A single 750-kilowatt (kW) wind turbine, typical of those now being installed in power plants around the world, produces roughly 2 million kilowatt-hours (kWh) of electricity annually		* Power available works as a CUBE of the amount of wind present. In general, a site needs to have average wind speeds of over 5m/s (11mph) for cost effective generation. Stronger less turbulent wind is 30 m above the ground and higher. A single 750-kilowatt (kW) wind turbine, typical of those now being installed in power plants around the world, produces roughly 2 million kilowatt-hours (kWh) of electricity annually

	Environmental Impact		Environmental Impact
Line 15:		Line 15:
	** Based on the U.S. average fuel mix, approximately 1.5 pounds of CO2 is emitted for every kW generated. Post production, a wind turbine does not emit CO2. A 750 watt wind turbine can prevent the production of CO2 from other power plants that 500 acres of forest can absorb. On average, 300 American homes can be powered by a 1kW turbine.		** Based on the U.S. average fuel mix, approximately 1.5 pounds of CO2 is emitted for every kW generated. Post production, a wind turbine does not emit CO2. A 750 watt wind turbine can prevent the production of CO2 from other power plants that 500 acres of forest can absorb. On average, 300 American homes can be powered by a 1kW turbine.
	* Noise		* Noise
	** At a distance of 700-1000 ft, an operating wind farm is no louder than the hum of a refrigerator or a moderately quiet room.		** At a distance of 700-1000 ft, an operating wind farm is no louder than the hum of a refrigerator or a moderately quiet room. Small turbines generally create more noise than the larger ones, because they have a higher rotational speed of the tip. More research money has been devoted to decreasing the noise in larger turbines than in smaller turbines.

	{\| border="1"		{\| border="1"
	\| Rural night-time background\|\| 20-40 dB		\| Rural night-time background\|\| 20-40 dB
Line 27:		Line 28:
	\| Jet aircraft at 250m\|\| 105 dB		\| Jet aircraft at 250m\|\| 105 dB
	\|}		\|}
	** Small turbines generally create more noise than the larger ones, because they have a higher rotational speed of the tip. More research money has been devoted to decreasing the noise in larger turbines than in smaller turbines.		db - decibel


	* Bird and Bats		* Bird and Bats
	** The National Audubon Society (NAS) has recently issued a statement that wind turbines are less harmful to bird populations than cars, planes, and other man-made contributions. NAS ~~has~~ supported the development of wind energy. According to research in the U.S. And Denmark, the leading country in wind energy production, power lines pose a higher threat to birds than wind turbines. Deaths caused by wind towers and turbines are on the individual level, not ~~the~~ population. Places with high mortality rates are routinely investigated.		** The National Audubon Society (NAS) has recently issued a statement that wind turbines are less harmful to bird populations than cars, planes, and other man-made contributions. NAS recently supported the development of responsibly located wind turbines for energy production. According to research in the U.S. And Denmark, the leading country in wind energy production, power lines pose a higher threat to birds than wind turbines. Deaths caused by wind towers and turbines are on the individual level, not population. Places with high mortality rates are routinely investigated.
	Newer technology has lowered the mortality rate to bats and birds. The single tower instead of a lattice support or guy wires makes collisions with the pole itself less of an issue in HAWTs. Blades are not required to spin as fast as they were twenty years ago and towers spaced farther apart to lower the risk to the avian population.		Newer technology has lowered the mortality rate to bats and birds. The single tower instead of a lattice support or guy wires makes collisions with the pole itself less of an issue in HAWTs. Blades are not required to spin as fast as they were twenty years ago and towers spaced farther apart to lower the risk to the avian population.

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	* Background		* Background
	** The earliest known wind turbine is from Persia, the area now known as Iraq~~. These~~ were of the vertical axis design. Centuries later, Holland perfected the art of harvesting wind with propeller blades on a rotating axis to face the wind.		** The earliest known wind turbine is from Persia, the area now known as Iraq, and were of the vertical axis design. Centuries later, Holland perfected the art of harvesting wind with propeller blades on a rotating axis to face the wind.
	** Windmills are primarily used to gather water or grind grain. Turbines (or modern windmills) are used to harvest electricity. Early grain grinders were straight forward, with the grinding stone attached to the vertical shaft of the windmill.		** Windmills are primarily used to gather water or grind grain. Turbines (or modern windmills) are used to harvest electricity. Early grain grinders were straight forward, with the grinding stone attached to the vertical shaft of the windmill.

Tammma at 16:46, 12 August 2005

2005-08-12T16:46:36Z

← Older revision		Revision as of 16:46, 12 August 2005
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	Highlights		Highlights
	* ~~How do~~ Wind turbines ~~work? Very~~ similarly as airplane wings. When the wind passes over the blade it creates a localized low pressure area behind the blade. The blade is then pulled into this area~~, causing the rotor to turn~~. This is called lift. The push of the wind on the blade is drag. The force of lift is significantly stronger than ~~the~~ drag. The combination of lift and drag cause the rotor to turn and ~~spins the generator creating electricity~~. ~~In turbines, the blades are connected to a~~ drive shaft ~~that~~ turns a generator ~~that creates~~ electricity.		* Wind turbines turn by a combination of lift and drag, very similarly as airplane wings. When the wind passes over the blade it creates a localized low pressure area behind the blade. The blade is then pulled into this area. This is called lift. The push of the wind on the blade is drag. The force of lift is significantly stronger than that of drag. The combination of lift and drag cause the rotor to turn and turns a drive shaft. The drive shaft in turn, turns the generator, creating electricity.
	* HAWT vs. VAWT		* HAWT vs. VAWT
	** ~~HAWT -~~ Horizontal Axis Wind ~~Turbine â€“~~ make up 95% of all wind machines in the world. The blades look like airplane propellers. There can be 1, 2, or 3 blades on a tower. Most commonplace are 2 or 3 blades because the blades ~~correct~~ torque		** Horizontal Axis Wind Turbines, or HAWTs, make up 95% of all wind machines in the world. The blades look like airplane propellers. There can be 1, 2, or 3 blades on a tower. Most commonplace are 2 or 3 blades because the blades balance each other and minimize torque.
	** ~~VAWT â€“~~ Vertical Axis Wind Turbines~~. Have a~~ much higher strain on rotors because of the guy wires needed to keep it erect. ~~Also~~ can't be placed on higher towers. There are different styles of VAWT, but all experience the same problems.		** Vertical Axis Wind Turbines, VAWT, have much higher strain on rotors because of the guy wires needed to keep it erect. They also can't be placed on higher towers to take advantage of the more stable winds. There are different styles of VAWT, but all experience the same problems.
	*** VAWT picture -- http://www.memagazine.org/backissues/jun04/features/apptowind/30topc.jpg HAWT picture -- http://www.bergey.com/images/Excel.CEC.jpg		*** VAWT picture -- http://www.memagazine.org/backissues/jun04/features/apptowind/30topc.jpg HAWT picture -- http://www.bergey.com/images/Excel.CEC.jpg
	* Wind Prospecting		* Wind Prospecting
	** Before a wind farm is set up, prospecting must be done. Anemometers are set up to determine the average wind speed. For a wind turbine to be practice the general consensus is the average wind speed is greater than 12 mph. ~~(1)~~		** Before a wind farm is set up, prospecting must be done. Anemometers are set up to determine the average wind speed. For a wind turbine to be practice, the general consensus is the average wind speed is greater than 12 mph.

	Power		Power
Line 13:		Line 13:
	Environmental Impact		Environmental Impact
	* Pollution		* Pollution
	** Based on the U.S. average fuel mix, approximately 1.5 pounds of CO2 is emitted for every ~~kWh~~ generated. A 750 ~~W Wind~~ turbine can prevent the production of CO2 that 500 acres of forest can absorb. On average, 300 American homes can be powered by a 1kW turbine.		** Based on the U.S. average fuel mix, approximately 1.5 pounds of CO2 is emitted for every kW generated. Post production, a wind turbine does not emit CO2. A 750 watt wind turbine can prevent the production of CO2 from other power plants that 500 acres of forest can absorb. On average, 300 American homes can be powered by a 1kW turbine.
	* Noise		* Noise
	** At a distance of 700-1000 ft, an operating wind farm is no louder than the hum of a refrigerator or a moderately quiet room.		** At a distance of 700-1000 ft, an operating wind farm is no louder than the hum of a refrigerator or a moderately quiet room.
Line 27:		Line 27:
	\| Jet aircraft at 250m\|\| 105 dB		\| Jet aircraft at 250m\|\| 105 dB
	\|}		\|}
	** Small turbines generally create more noise than the larger ones, because:		** Small turbines generally create more noise than the larger ones, because they have a higher rotational speed of the tip. More research money has been devoted to decreasing the noise in larger turbines than in smaller turbines.
	~~***~~ they have a higher rotational speed of the tip
	*** more research money has been devoted to decreasing the noise in larger turbines.
	* Bird and Bats		* Bird and Bats
	** The ~~national~~ Audubon Society has recently issued a statement that wind turbines are ~~not more~~ harmful to bird populations than cars, planes, and other man-made contributions. ~~The National Audubon Society~~ has supported the development of ~~Wind Energy~~. According to research in the U.S. And Denmark, the leading country in wind energy production, power lines ~~poses~~ a higher threat to birds than wind turbines.		** The National Audubon Society (NAS) has recently issued a statement that wind turbines are less harmful to bird populations than cars, planes, and other man-made contributions. NAS has supported the development of wind energy. According to research in the U.S. And Denmark, the leading country in wind energy production, power lines pose a higher threat to birds than wind turbines. Deaths caused by wind towers and turbines are on the individual level, not the population. Places with high mortality rates are routinely investigated.
	** The deaths that are caused by ~~Wind~~ towers and turbines are on the individual level, not the population.		Newer technology has lowered the mortality rate to bats and birds. The single tower instead of a lattice support or guy wires makes collisions with the pole itself less of an issue in HAWTs. Blades are not required to spin as fast as they were twenty years ago and towers spaced farther apart to lower the risk to the avian population.
	~~***~~ Places with high mortality rates are ~~being~~ investigated.
	** Newer technology has lowered the mortality rate to bats and birds. The single tower instead of a lattice support or guy wires makes collisions with the pole itself less of an issue. Blades are not required to spin as fast as they were 20 years ago and towers spaced farther apart to lower the risk to the avian population.
	Comparison of Power Plants		Comparison of Power Plants

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	* Background		* Background
	** ~~History of Windmills: Earliest~~ known is from Persia (area now known as Iraq). These were of the vertical axis design. Centuries later, Holland ~~(Denmark)~~ perfected the art of harvesting ~~winds~~ with propeller blades on a rotating axis to face the wind.		** The earliest known wind turbine is from Persia, the area now known as Iraq. These were of the vertical axis design. Centuries later, Holland perfected the art of harvesting wind with propeller blades on a rotating axis to face the wind.
	** Windmills are primarily used to gather water or grind grain. Turbines (or modern windmills) are used to harvest electricity. Early grain grinders were straight forward, with the grinding stone attached to the vertical shaft of the windmill.		** Windmills are primarily used to gather water or grind grain. Turbines (or modern windmills) are used to harvest electricity. Early grain grinders were straight forward, with the grinding stone attached to the vertical shaft of the windmill.


	* More information		* More information

Tammma at 14:45, 12 August 2005

2005-08-12T14:45:08Z

← Older revision		Revision as of 14:45, 12 August 2005
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	\| 0\|\| 1.79-10\|\| 1.50		\| 0\|\| 1.79-10\|\| 1.50
	\|}		\|}

			[http://www.awea.org/pubs/factsheets/EmissionKB.PDF tables of emissions]

	* Background		* Background

Tammma at 15:25, 9 August 2005

2005-08-09T15:25:25Z

← Older revision		Revision as of 15:25, 9 August 2005
Line 2:		Line 2:
	* How do Wind turbines work? Very similarly as airplane wings. When the wind passes over the blade it creates a localized low pressure area behind the blade. The blade is then pulled into this area, causing the rotor to turn. This is called lift. The push of the wind on the blade is drag. The force of lift is significantly stronger than the drag. The combination of lift and drag cause the rotor to turn and spins the generator creating electricity. In turbines, the blades are connected to a drive shaft that turns a generator that creates electricity.		* How do Wind turbines work? Very similarly as airplane wings. When the wind passes over the blade it creates a localized low pressure area behind the blade. The blade is then pulled into this area, causing the rotor to turn. This is called lift. The push of the wind on the blade is drag. The force of lift is significantly stronger than the drag. The combination of lift and drag cause the rotor to turn and spins the generator creating electricity. In turbines, the blades are connected to a drive shaft that turns a generator that creates electricity.
	* HAWT vs. VAWT		* HAWT vs. VAWT
	** ~~Hawt~~ - Horizontal Axis Wind Turbine â€“ make up 95% of all wind machines in the world. The blades look like airplane propellers. There can be 1, 2, or 3 blades on a tower. Most commonplace are 2 or 3 blades because the blades correct torque		** HAWT - Horizontal Axis Wind Turbine â€“ make up 95% of all wind machines in the world. The blades look like airplane propellers. There can be 1, 2, or 3 blades on a tower. Most commonplace are 2 or 3 blades because the blades correct torque
	** VAWT â€“ Vertical Axis Wind Turbines. Have a much higher strain on rotors because of the guy wires needed to keep it erect. Also can't be placed on higher towers. There are different styles of VAWT, but all experience the same problems.		** VAWT â€“ Vertical Axis Wind Turbines. Have a much higher strain on rotors because of the guy wires needed to keep it erect. Also can't be placed on higher towers. There are different styles of VAWT, but all experience the same problems.
	*** VAWT picture -- http://www.memagazine.org/backissues/jun04/features/apptowind/30topc.jpg HAWT ~~picure~~ -- http://www.bergey.com/images/Excel.CEC.jpg		*** VAWT picture -- http://www.memagazine.org/backissues/jun04/features/apptowind/30topc.jpg HAWT picture -- http://www.bergey.com/images/Excel.CEC.jpg
	* Wind Prospecting		* Wind Prospecting
	** Before a wind farm is set up, prospecting must be done. Anemometers are set up to determine the average wind speed. For a wind turbine to be practice the general consensus is the average ~~windspeed~~ is greater than 12 mph. (1)		** Before a wind farm is set up, prospecting must be done. Anemometers are set up to determine the average wind speed. For a wind turbine to be practice the general consensus is the average wind speed is greater than 12 mph. (1)

	Power		Power
	* Power available works as a CUBE of the amount of wind present. In general a site needs to have average wind speeds of over 5m/s (11mph) for cost effective generation. Stronger less ~~turbulant~~ wind is 30 m above the ground and higher. A single 750-kilowatt (kW) wind turbine, typical of those now being installed in power plants around the world, produces roughly 2 million kilowatt-hours (kWh) of electricity annually		* Power available works as a CUBE of the amount of wind present. In general a site needs to have average wind speeds of over 5m/s (11mph) for cost effective generation. Stronger less turbulent wind is 30 m above the ground and higher. A single 750-kilowatt (kW) wind turbine, typical of those now being installed in power plants around the world, produces roughly 2 million kilowatt-hours (kWh) of electricity annually

	Environmental Impact		Environmental Impact
	* ~~Polution~~		* Pollution
	** Based on the U.S. average fuel mix, approximately 1.5 pounds of CO2 is emitted for every kWh generated. A 750 W Wind turbine can prevent the production of CO2 that 500 acres of forest can absorb. On average, 300 American homes can be powered by a 1kW turbine.		** Based on the U.S. average fuel mix, approximately 1.5 pounds of CO2 is emitted for every kWh generated. A 750 W Wind turbine can prevent the production of CO2 that 500 acres of forest can absorb. On average, 300 American homes can be powered by a 1kW turbine.
	* Noise		* Noise
	** At a distance of 700-1000 ft, an operating wind farm is no louder than the hum of a ~~refridgerator~~ or a moderately quiet room.		** At a distance of 700-1000 ft, an operating wind farm is no louder than the hum of a refrigerator or a moderately quiet room.
	{\| border="1"		{\| border="1"
	\| Rural night-time background\|\| 20-40 dB		\| Rural night-time background\|\| 20-40 dB
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	*** more research money has been devoted to decreasing the noise in larger turbines.		*** more research money has been devoted to decreasing the noise in larger turbines.
	* Bird and Bats		* Bird and Bats
	** The national Audubon Society has recently ~~isssued~~ a statement that wind turbines are not more harmful to bird populations than cars, planes, and other man-made contributions. The National Audubon Society has supported the development of Wind Energy. According to research in the U.S. And Denmark, the leading country in wind energy production, ~~powerlines~~ poses a higher threat to birds than wind turbines.		** The national Audubon Society has recently issued a statement that wind turbines are not more harmful to bird populations than cars, planes, and other man-made contributions. The National Audubon Society has supported the development of Wind Energy. According to research in the U.S. And Denmark, the leading country in wind energy production, power lines poses a higher threat to birds than wind turbines.
	** The deaths that are caused by Wind towers and turbines are on the individual level, not the population.		** The deaths that are caused by Wind towers and turbines are on the individual level, not the population.
	*** Places with high mortality rates are being investigated.		*** Places with high mortality rates are being investigated.
	** Newer technology has lowered the mortality rate to bats and birds. The single tower instead of a ~~latice~~ support or guy wires makes collisions with the pole itself less of an issue. Blades are not required to spin as fast as they were 20 years ago and towers spaced farther apart to lower the risk to the avian population.		** Newer technology has lowered the mortality rate to bats and birds. The single tower instead of a lattice support or guy wires makes collisions with the pole itself less of an issue. Blades are not required to spin as fast as they were 20 years ago and towers spaced farther apart to lower the risk to the avian population.
	Comparison of Power Plants		Comparison of Power Plants

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	\| $1000 \|\| $700-1,200 \|\| $1,070â€“$1,500		\| $1000 \|\| $700-1,200 \|\| $1,070â€“$1,500
	\|-		\|-
	! Average Operation & ~~Maitenance~~ ($/Mwh)		! Average Operation & Maintenance ($/Mwh)
	\| 15\|\| 24\|\| 20		\| 15\|\| 24\|\| 20
	\|-		\|-

Tammma at 18:46, 5 August 2005

2005-08-05T18:46:07Z

← Older revision		Revision as of 18:46, 5 August 2005
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	\|-		\|-
	! Capital Costs ($/kW)		! Capital Costs ($/kW)
	\| \|\| $700-1,200 \|\| $1,070â€“$1,500		\| $1000 \|\| $700-1,200 \|\| $1,070â€“$1,500
	\|-		\|-
	! Average Operation & Maitenance ($/Mwh)		! Average Operation & Maitenance ($/Mwh)

Tammma at 16:01, 5 August 2005

2005-08-05T16:01:18Z

← Older revision		Revision as of 16:01, 5 August 2005
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	\|-		\|-
	! Capital Costs ($/kW)		! Capital Costs ($/kW)
	\| \|\| \|\| $1,070â€“$1,500		\| \|\| $700-1,200 \|\| $1,070â€“$1,500
	\|-		\|-
	! Average Operation & Maitenance ($/Mwh)		! Average Operation & Maitenance ($/Mwh)
	\| 15\|\| 24\|\| 20		\| 15\|\| 24\|\| 20
	\|-		\|-
	! O&M ~~percent of original cost annually~~		! O&M per kWh
	~~\| 1.5-2%\|\| \|\|~~		\| $.01-.02 \|\| \|\| .04
	\|-
	\| per kWh \|\| $.01-.02 \|\| \|\| .04
	\|-		\|-
	! Variable O&M ($/Mwh)		! Variable O&M ($/Mwh)
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	\|-		\|-
	! Fuel Costs ($/MBtu)		! Fuel Costs ($/MBtu)
	\| 0\|\| \|\| 1.50		\| 0\|\| 1.79-10\|\| 1.50
	\|}		\|}

Tammma at 15:18, 5 August 2005

2005-08-05T15:18:12Z

← Older revision		Revision as of 15:18, 5 August 2005
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	\|-		\|-
	! Capacity Factor		! Capacity Factor
	\| \|\| 23%-57% \|\|		\| 25%-30% \|\| 23%-57% \|\| 80%
	! Capital Costs		\|-
	\| \|\| \|\| $1,070â€“$1,~~410~~		! Capital Costs ($/kW)
			\| \|\| \|\| $1,070â€“$1,500
	\|-		\|-
	! Average Operation & Maitenance ($/Mwh)		! Average Operation & Maitenance ($/Mwh)
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	\| 1.5-2%\|\| \|\|		\| 1.5-2%\|\| \|\|
	\|-		\|-
	\| per kWh \|\| $.01-.02 \|\| \|\|		\| per kWh \|\| $.01-.02 \|\| \|\| .04
	\|-		\|-
	! Variable O&M ($/Mwh)		! Variable O&M ($/Mwh)
	\| 0\|\| 2.4\|\| 1.8		\| 0\|\| 2.4\|\| 1.6-1.8
			\|-
			! Fuel Costs ($/MBtu)
			\| 0\|\| \|\| 1.50
	\|}		\|}

Tammma at 21:49, 4 August 2005

2005-08-04T21:49:53Z

← Older revision		Revision as of 21:49, 4 August 2005
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	! Plant Size (MW)		! Plant Size (MW)
	\| 100\|\| 500\|\| 500		\| 100\|\| 500\|\| 500
			\|-
			! Capacity Factor
			\| \|\| 23%-57% \|\|
			! Capital Costs
			\| \|\| \|\| $1,070â€“$1,410
	\|-		\|-
	! Average Operation & Maitenance ($/Mwh)		! Average Operation & Maitenance ($/Mwh)
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	** http://www.masstech.org/cleanenergy/wind.htm		** http://www.masstech.org/cleanenergy/wind.htm
	** (1) http://www.newtonhouse.info/wind.htm		** (1) http://www.newtonhouse.info/wind.htm
			** http://www.eas.asu.edu/~holbert/eee463/ECONOMICS.HTML

Tammma at 21:34, 2 August 2005

2005-08-02T21:34:13Z

← Older revision		Revision as of 21:34, 2 August 2005
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	\|-		\|-
	! Project Life (years)		! Project Life (years)
	\| 30\|\| 30\|\| 30		\| 20 (120,000 hours)\|\| 30\|\| 30
	\|-		\|-
	! Construction Period (years)		! Construction Period (years)

Tammma at 20:19, 2 August 2005

2005-08-02T20:19:51Z

← Older revision		Revision as of 20:19, 2 August 2005
Line 4:		Line 4:
	** Hawt - Horizontal Axis Wind Turbine â€“ make up 95% of all wind machines in the world. The blades look like airplane propellers. There can be 1, 2, or 3 blades on a tower. Most commonplace are 2 or 3 blades because the blades correct torque		** Hawt - Horizontal Axis Wind Turbine â€“ make up 95% of all wind machines in the world. The blades look like airplane propellers. There can be 1, 2, or 3 blades on a tower. Most commonplace are 2 or 3 blades because the blades correct torque
	** VAWT â€“ Vertical Axis Wind Turbines. Have a much higher strain on rotors because of the guy wires needed to keep it erect. Also can't be placed on higher towers. There are different styles of VAWT, but all experience the same problems.		** VAWT â€“ Vertical Axis Wind Turbines. Have a much higher strain on rotors because of the guy wires needed to keep it erect. Also can't be placed on higher towers. There are different styles of VAWT, but all experience the same problems.
	*** VAWT picture -- http://www.memagazine.org/backissues/jun04/features/apptowind/30topc.jpg		*** VAWT picture -- http://www.memagazine.org/backissues/jun04/features/apptowind/30topc.jpg HAWT picure -- http://www.bergey.com/images/Excel.CEC.jpg
	* Wind Prospecting		* Wind Prospecting
	** Before a wind farm is set up, prospecting must be done. Anemometers are set up to determine the average wind speed. For a wind turbine to be practice the general consensus is the average windspeed is greater than 12 mph. (1)		** Before a wind farm is set up, prospecting must be done. Anemometers are set up to determine the average wind speed. For a wind turbine to be practice the general consensus is the average windspeed is greater than 12 mph. (1)