Your Questions About Windmill Water Pump

admin answers:

If the windmill is over sized for the pumping job then I can’t see any reason it couldn’t. However it might be more practical to have a second windmill dedicated to electricity generation. I’d think it is unlikely that the pumping windmill is much over sized and there may be some mechanical difficulties involved with adding a generator to a mill that was designed for pumping.

admin answers:

Pressure of water is 9800 N/m^2 for every meter of depth

Pressure = gravity * density * depth

But since you already know that water has a pressure per cubic meter of 9800 Newtons, that negates having to use density( since density is a mass per volume equation itself), all you have to do is multiply 30 by the pressure:

30 * 9800 N/m^2 = 294,000 N/m^2 gauge pressure

admin answers:

Windmills require wind and water wheels require water. The move away from those sources started because a more reliable source was found that being fossil fuels or modern hydro-power.

admin answers:

The simple answer is because they are not well-designed to capture low-speed winds and are too large in diameter to economically use more blades. Here is an interesting site for more on that:

http://nov55.com/wdm.html

More blades are better for higher efficiency because more blades intercept more of the available wind and at a lower minimum wind speed. The down side is more blades have a lower maximum wind speed. When the wind blows faster than the maximum speed for which the windmill is designed, the blades must be “feathered” and pointed edge-on into the wind to keep the windmill from literally flying apart.

Apparantly there has been little or no recent “practical” engineering study (using real windmills, not computer models) of number of blades versus diameter versus wind speed to determine what works “best” for small or personal wind farms.

I am pretty sure such studies were performed for the giant 3-blade windmills you see in areas with a more or less steady wind and with a predictable range of wind velocities. No one would finance such contraptions without at least some sort of engineering feasibility study… I would hope!

A more subtle reason might be how the wind power is converted to electricity. Large 3-bladed wind farms must feed into the 3-phase alternating current grid if they are to be economically effective. That probably influences their diameter and rotation speed.

If I were building one (or several) of these puppies, I think I would take a clue from automobile alternators: generate variable frequency 3-phase alternating current and rectify it to direct current. Use the direct current to drive a pulse-width modulated (PWM) 3-phase inverter making constant frequency 60 Hz alternating current. You can feed that right into the power grid with proper synchronization.

You might get yourself an automobile alternator and connect it to a 15 to 20 blade windmill, three or four feet in diameter, just to see how much power it will produce in a moderate wind of 5 to 15 MPH. Most modern alternators are good for at least a kilowatt, more if properly cooled.

admin answers:

Aeromotor Windmill Company has been in business since 1888. They are still manufacturing and selling them. They are located in San Angelo, Texas. They seem a little expensive but remember there is never an electric bill or other fuel bill.

admin answers:

All 3 questions have the same answer, depends on the size. Water pumps, coils (I think you mean electromagnet) and wind turbines all come in a wide range of sizes.

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admin answers:

140w for 3 hours (10800 sec) is 1512000 Joules.
X 0.8 that is 1209600 J

50 ft = 15 meters

To lift 1 kg 15m takes PE = mgh = 1*9.8*15 = 149 J / kg

so 1209600 J / 149 J/kg = 8099 kg

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admin answers:

I had a similar problem three years back when we first moved into our home. When we found out that it would cost a fortune to implement the “windmill system” you described i researched alternative solutions. What i found i have posted below:

1) I purchased a OTC OTC4042 Cobra Hydraulic Ram- Pump and Hose Set from sears. (It may seem small but it had enough power to pump water for our entire home.
2) I inserted the rear nozzle into the well with this extension: Craftsman 25 ft. Extension Hose ( i used four of these because my well was very deep)
3) I fixed the front nozzle piece into the irrigation system, this will then redirect the low of water through the large ducting pipes of the irrigation system which will supply water to faucets and showers etc.
4) Enjoy (and for a low price and low labor )

admin answers:

Windmills are a simple device that coverts wind energy into circular motion. The difference is in the size, number of blades, speed and the complexity of their control systems.

In the simplest of forms, the classic windmill seen in the US uses the wind to turn a crankshaft attached to a clapper type positive displacement pump not unlike the hand pump used for many years on farms and homes.

The most complex windmills are those seen generating electric power in large volumes on wind farms.