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8/19/2019 Wind Energy Lecture 1
http://slidepdf.com/reader/full/wind-energy-lecture-1 1/42
Lebanese University, Faculty of Engineering
Mechanical Engineering Department
Wind Energy
Lecture Notes For
Mechanical Engineering Students
2014 - 2015
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References
1- Renewable and Efficient Electric Power
Systems, Gilbert M. Masters
2- Wind Energy Explained, J.F.Manuel
3- Aerodynamics of Wind Turbines, Martin
4- Renewable Energy Fundamentals, Bistritski
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• Wind power could generate up to 18% of the world’s
electricity by 2050, compared with 2.6% today.
• The nearly 400 gigawatts of current wind powerworldwide must increase eight- to ten-fold to achievethe IEA roadmap’s vision.
• It sees China overtaking OECD Europe as the leadingproducer of wind power by 2020 or 2025, with theUnited States ranked third.
• Wind power deployment under this vision would saveup to 4.8 gigatonnes of CO2 emissions per year by 2050
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Top 15 countries
by nameplate wind power capacity
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Top 10 countries by wind power
electricity production [2012]
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Wind energy cost
Fixed / Initial + Operating
• The cost of a wind system has two components:
initial installation costs and operating expenses.
• The initial installation cost includes the purchase
price of the complete system (including tower,wiring, utility interconnection or battery storage
equipment, power conditioning unit, etc.) plus
delivery and installation charges, professionalfees and sales tax.
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Operating costs
• Operating costs include maintenance and
service, insurance and any applicable taxes.
• A rule of thumb estimate for annual operating
expenses is 2% to 3% of the initial system cost.
• Another estimate is based on the system’s
energy production and is equivalent 1 to 2
cents per kWh of output.
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Cost of installed KW
• A grid-connected residential-scale system (1-10 kW) generally costs between $2,400 and$3,000 per installed kilowatt.
• A medium-scale, commercial system (10-100kW) is more cost-effective, costing between$1,500 and $2,500 per kilowatt.
•
Large-scale systems of greater than l00 kWcost in the range of $1,000 to $2,000 perkilowatt
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Calculating the Cost Per kWh
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Annual Cost = (Initial Cost/Expected Life) +
Annual Operating Costs
Wind turbine manufacturers estimate a useful
life of between 20 and 30 years for their
product.
• Cost Per kWh = Annual Cost/Annual Energy
Output
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example
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• Annual cost = ($100,000/25 years) +
$1,000/year = $4,000 + $1,000 = $5,000/year
• Cost per kWh = ($5,000/year)/100,000
kWh/year = $0.05 per kWh
• US cost: 2.5 – 5 cents per KWh
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Cost comparison based on levelized
energy costs LEC
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The LEC represents the total cost
to build and operate a new power
plant over its life divided to equal
annual payments and amortizedover expected annual electricity
generation.
It reflects all the costs including
initial capital, return oninvestment, continuous operation,
fuel, and maintenance, as well as
the time required to build a plant
and its expected lifetime
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Lifecycle greenhouse gas emission estimates for
electricity generators, according to Benjamin K.
Sovacool's comparison
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World’s First Wind Turbine
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https://www.youtube.com/watch?v=llIbjC49Fjs
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http://www.energy.gov/eere/wind/how-does-wind-turbine-work
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Types of Wind Turbines
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The cost of a turbine
increases roughly in
proportion to blade
diameter, but power isproportional to
diameter squared, so
bigger machines have
proven to be more costeffective.
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ρ = f (p,T)
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USA
Europe
Impact of Tower Height
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• For large machines, when a blade isat its high point, it can be exposed tomuch higher wind forces than whenit is at the bottom of its arc.
• This variation in stress as the blademoves through a complete revolutionis compounded by the impact of thetower itself on wind speed-especiallyfor downwind machines, which havea significant amount of windshadowing as the blades pass behindthe tower.
• The resulting flexing of a blade canincrease the noise generated by the
wind turbine and may contribute toblade fatigue, which can ultimatelycause blade failure.
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• For a given wind speed, rotor efficiency is a function ofthe rate at which the rotor turns.
• If the rotor turns too slowly, the efficiency drops offsince the blades are letting too much wind pass by
unaffected.• If the rotor turns too fast, efficiency is reduced as the
turbulence caused by one blade increasingly affects theblade that follows.
• The usual way to illustrate rotor efficiency is to present
• it as a function of its tip-speed ratio (TSR).
• The tip-speed-ratio is the speed at which the outer tipof the blade is moving divided by the wind speed.
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A 40-m, three-bladed wind turbine produces 600 kWat a wind speed of 14 m/s. Air density is the standard1.225 kg/m3. Under these conditions:
a. At what rpm does the rotor turn when it operates
with a TSR of 4.0?
b. What is the tip speed of the rotor?
c. If the generator needs to turn at 1800 rpm, whatgear ratio is needed to match the rotor speed to thegenerator speed?
d. What is the efficiency of the complete wind turbine(blades, gear box, generator) under these conditions?
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