Engineering Homework Help
Career Academy of Texas ?wind Turbine Evaluation Questions and Results
1.. Upload your own XL file similar to the sample file; BladeDesign-1.xlsx
FYI Calculation of Wind turbine power output;Tip-Speed-Ratio-Provided-by-Kid-Wind-PDF.pdf
Sample table; Fill out the table and answer the questions;
How many homes are poweredNameLocationOffshorePlainsHillsBlade Design Blade Length, m Blade Pitch, o Blade Twist Tip Shape Airfoil Shape Turbine Height, m Performance (Web Output) Power Production, W Efficiency Factor Watts/Unit Cost No. of homes Powered Manual CalculationWindspeed m/sAir density, kg/m3Area of blade turning, m2RPMTip SpeedTSR
Eff. of WT
Generator Eff.Gear Box Eff.Power Production, kW
Wind speed map at 100 m high;
Potential Wind Turbine Power: (m3 = cubic meter)
P = 0.5 x rho x A x Cp x V3 x Ng x Nb
where:
P = power in watts (746 watts = 1 hp) (1,000 watts = 1 kilowatt)
rho = air density (about 1.225 kg/m3 at sea level, less higher up)
A = rotor swept area, exposed to the wind (m2)
Cp = Coefficient of performance (.59 {Betz limit} is the maximum theoretically possible, .35 for a good design)
V = wind speed in meters/sec (20 mph = 9 m/s)
Ng = generator efficiency (50% for car alternator, 80% or possibly more for a permanent magnet generator or grid-connected induction generator)
Nb = gearbox/bearings efficiency (depends, could be as high as 95% if good)
Use half of the potential, as calculated above, for basis in further calculations.
2. Answer the following questions;
A. Describe the blades that seemed to perform the best. What characteristics did they have?
B. Why do you think they performed so well?
