Periodicals

Wind Power Digest, 6 yr. for 4 issues, Jester Press, 2. AWEA Newsletter, 25 yr. (includes membership) American Wind Energy Association, c o Secretary, AWEA, 54468 CR 31, Bristol, IN 46507 3. Windustries, 10 yr. for 4 issues ( 15 institutions), Great Plains Windustries, Inc P.O. Box 126. Lawrence, KS 66044 4. RAIN Journal of Appropriate Technology, 10 yr for 10 issues, RAIN, 2270 N.W. Irving, Portland, OR 97210 5. Alternative Sources of Energy, 6 yr for 4 issues, A.S.E., Rt. 2, P.O. Box 90-A,...

Rts

Jet pump geared . directly to windmill. Two or three pipes come down the tower from the pump. Allows greater flexibility of WECS siting than B. Common, relatively inexpensive pump, which is relatively efficient. Avoids generator and motor losses of the electrical system. Minimum wind speed for developing minimum head for pumping may be quite high. Must prime the pump at the top of the tower. FIGURE 6-4 Different possible ways to pump water with a wind system. Some of the options you have in...

Chapter The Components Of A Wind Energy Conversion System

A wind turbine dealer should be able to advise you on the components for your wind energy system. This chapter will nrovide you with the basics on each component you purchase. It 'ill help you ask the right questions and better understand any ECS brochures you receive. The wind turbine is considered first. Why do some wind turbines only have two or three narrow blades while others have many wide blades What are the basic choices in *.ypes of wind turbine rotors These items are discussed, and a...

Wind Power Variations With Height And Local Terrain

From Figure 3-10 and the wind power records in Appendix 1, you can obtain a general idea whether your part of the country has good wind power. If you live in an area with apparently low wind power, certain types of hill terrain can double the local wind speed, and this will create an eightfold increase in available wind power. If, on the other hand, you are in a generally good wind area, your local winds may be disappointingly poor due to mountains, ridges, trees, or buildings. Generally, if...

Wind Power Variations With Time

A 16-foot-diameter wind turbine might produce one kilowatt of power in a steady 15-mph wind, depending on the design. One kilowatt of power produced continuously for 30 days amounts to 720 kilowatt-hours. This amount of energy is about that used in the typical American home. The wind, however, is not constant. It is even more erratic than the average person would expect. The speed-cubed effect described in the previous chapter magnifies the effect of the fluctuating wind. For instance, a 20-mph...

Comparison Of Power Costs Using Two Different Wind Turbines

All too often a WECS installation is purchased according to first cost rather than performance. Since the cheapest windmiio. will do is never really an appropriate criterion, you snould understand what the cheapest windmill really is. Analyze, as an example, a simple wind electric system that is used only for heating water (Fig. 5-40). Compare the two hypothetical wind turbines that were described in Chapter 5 (Wir.J-mill Power and Energy Calculations). Both are rated at 1000 watts of power,...

Wind Machine Rotor Construction

The major construction variations you find when selecting a wind turbine generally will involve the blades. The diagrams and discussion that follow are suited to propeller as well as Darrieus machines. One popular blade material is wood, either laminated or solid, with or without fiberglass coatings (Fig. 522). (Jncoated wooden blades usually have a copper or other metal leading edge cover for protection against erosion by sand, rain, and other environmental factors. The extruded hollow...

Wind Power In The United States And Southern Canada

The following table lists the wind power at 750 stations in the United States and Southern Canada. The data in the table have been extracted from the report Wind Power Climatology in the United States by Jack Reed of Sandia Laboratories, Albuquerque, New Mexico (June 1975). This report (SAND 74-0348) can be ordered from the National Technical Information Service, U.S. Department of Commerce, 5285 Port Royal Road, Springfield, VA 22151. A printed copy costs 7.60 and a microfiche copy costs 2.25...

Average Wind Power Distribution In The United States

At over one thousand locations in the United States, a daily log sheet is filled out with hourly weather observations of the one-minute average wind speed and direction. These records are sent to the National Climatic Center in Asheville, North Carolina, where these one-minute averages for every third hour are entered onto computer magnetic tape. Various monthly and yearly summaries are prepared, and all the original data are stored in archives. Each station receives summaries of its data and...

Info

The data from 750 wind recording stations in the United States and southern areas of bordering Canadian provinces have been processed to determine monthly averages of available wind power. The results are included in this report in Appendix I. The stations are arranged with the states in alphabetical order and by region within the state. These data have not been corrected for varying heights of the wind anemometer1 (the instrument that is used to measure wind speed). Also, distortions in the...

Wind Turbine B

Wind Turbine A costs 19.7flS kWh, while Wind Turbine B costs 11.2 kWh. However, Wind Turbine A costs only 2500 to purchase and install, compared to 3200 for Wind Turbine B. If you ask which one is really cheaper, you must consider other factors. Wind Turbine B has roughly twice the energy yield of Wind Turbine A, but, from your calculation of energy requirement in Chapter 4, do you really need twice the yield Will the extra yield allow future growth that you forgot to allow for in your energy...

Urr

FIGURE 2-3 Forces acting on a wind turbine blade. FIGURE 2-3 Forces acting on a wind turbine blade. You can perform simple experiments to verify lift. Take a sheet of stiff cardboard or a wood slat about the size of a 3-by-5 inch filing card. During a trip in an automobile, at about 30 mph hold the sheet or slat out in the wind. You are now ready to experience lift and drag. Gripping one end only, hold the board with its long dimension pointing outward from the car. Hold it edgewise to the...

Figure Darrieus Eggbeater rotor

Rotor Darrieus

FIGURE 5-6 Propelier-type wind turbine snerator. FIGURE 5-6 Propelier-type wind turbine snerator. WIND SYSTEM PERFORMANCE Comparing Different Types of Wind Machines Figure 5-3 shows a farm windmill, and Figure 5-4, a Savon-ious rotor. While these two types of wind systems are very different, both windwheels present a large surface area to the. wind in relation to the width and height on the machine. Notice thdt almost the entire disk area of the farm windmill is covered by blade surface this...

Ii

FIGURE 5-41 Complete electrical system with wind furnace. Between 1951 and 1969 the Oerlikon Electrogyro bus was operated in Switzerland and the Belgian Congo. This was a flywheel-powered bus experiment in which a large flywheel was recharged at each bus stop. Recent literature Scientific American, December 1973 discusses an improved flywheel energy storage device, the super flywheel. The super flywheel is different from the traditional spoked-rim flvwheel, which propelled mine cars and...

Bac Pivot

FIGURE A2-3 Assembling a free standing octahedron tower FIGURE A2-5 Hoisting a wind machine up the tower. Tilting up a tower with the wind machine already installed Fig. A2-6. , imposes additional loads on the tower. The compressive load at the base pivot and the bending loads where the rope is attached will be much greater. Most likely, you will -ave to provide extra bracing, but in any case you should consult the manufacturer about these loads or rely on a competent installation crew....