WIND ENERGY SYSTEMS - Cd3wd

Chapter 2—Wind Characteristics 2–65
Figure 27: Isotach 0.01 quantiles in meters per second. Annual extreme mile (1.6 km) 10 m
above ground; 100-year mean recurrence intervals. (After [23].)
(a) k =1.2
(b) k =2.8
Note: If you use the math tables, you will need to use linear interpolation to get five
significant places.
11. Values of wind speed u i in knots and numbers of readings per year m i at each speed u i
are given below for Dodge City in 1971. Note that there are 2920 readings for that year.
(a) Compute the mean wind speed in knots. Express it in m/s.
(b) Prepare a table of u i , x i , m i , f(u i ), F (u i ), and y similar to Table 2.3.
(c) Plot the data points of y versus x similar to Fig. 18.
(d) Ignore wind speeds below 3 knots and above 31 knots and compute ¯x, ȳ, a, b, k,
and c using Eqs. 55– 56.
Wind Energy Systems by Dr. Gary L. Johnson November 20, 2001