Fly Wheel Energy Storage

A search for kinetic energy would be a good start.

did that it was very good but looking for more detail cross section pics,on opperating fly wheels thanks aways search before ?

Try searching some old steam reciprocating as well as low speed diesel engines. They had pretty massive fly wheels.

If you're lucky enough to have the Machinery's Handbook 21st edition, go to pages 333 thru 345.

I wish I could help you better, but it is beyond my knowledge.

Yahlasit

Composite Flywheels Assessed by NDE and FEA

U.S. Army Aviation conducted quite a bit of research in the 70's and 80's on storing kinetic energy in composite flywheels.for use in providing power to autorotate in case of engine failure. I don't have the report numbers but the work was funded by the Aviation Applied Technology Directorate in Ft. Eustis, VA. The reports may be available on line from the National Technology Information Center.

There have been a number of articles in Scientific American over the past few decades on flywheels - composite and other; magnetic bearings, evacuated housings, etc. A google on scientific american turned up a few of those articles. Some of these have been considered for use in cars and even trucks. But these are not your grandpa's flywheels. RPM are in six figures. A trip to the library might find older articles from the '70's that are not yet in digital formats. A fellow named Dr. Richard Post was active in the field then, and still is. A google on "Richard Post" flywheel even turned up a May 2000 Wired magazine article on the subject which might be of interest, and lead you to other sources.

What İ have seen are for monentary energy storage - such as frequency control and not over time.

The grid itself is already an enormous flywheel, including the rotational inertia of all the turbines and generators that supply it. When a big load is imposed, all of that stuff slows down until the various governors bring it back up to speed. If you want to buy a frequency meter, you can track this yourself. Some versions of "smart appliances" do the same thing, shutting themselves off to ease the total load until full speed (frequency) returns. This is a good concept, but not yet widely implemented.

Some time relays and/or diversity of deadbands should be included to prevent all of the interrupted loads from restarting at once, which would "porpoise" the system with repeated stops/restarts.

physics would also be a good start......with gyroscopic effects.

Did you try U.S.Department of energy?(DOE).There is a lot infomation about,for sample:http://www.oe.energy.gov/DocumentsandMedia/Project_FrequReg_Paper.pdf

Flywheel Storage for Load Leveling Applications is coming on line now.

http://news.cnet.com/8301-11128_3-9968539-54.html

This type of storage, along with hydro-storage, appears to be an enabling technology for tidal power systems that use submerged hydro-turbines in coral channels to produce power.

Unlike solar or wind energy, tidal energy is predictable and reliable but has the draw back of no production as the tide turns. During this short time power must be produced using some alternative method until the water velocity is once again high enough to supply the power. Flywheel or Hydro-storage may be viable methods of meeting that short term demand.

I recently visited Yap where the electricity for my cabin cost about 37 cents a kilowatt hour. Given the high cost of energy and the reliance on diesel electric generation there may be some opportunity for these types of applications having a reasonable return on investment.

Gavilan

This sounds like a perfect scenario for flywheel storage. Because it is short-term (about 6 hours), it will not suffer much from decaying rpm of the flywheel(s) over longer times.

thank you for the help all have 'nt had time to reply or follow your leads busy wk end

What flywheel offers 6 hours? Haven't seen that yet.

Yes, that was just my quick grab at the maximum length of a storage/release cycle. I would guess that tidal height and velocity are both basically sinusoidal. Zero velocity would be for only an instant, but this would be flanked by longer periods of slow velocity. Store energy for say four hours; then retrieve for two?

Re another post: I think, but am not sure, that I have read of flywheels that can operate over such a length of time. There was a recent thread about an underground flywheel station in New Jersey; if I can find it again there might be some data.

İf you see anything it would be interesting and İ will be watching/looking as well. İ know flywheels are being used for frfequency control for momentary blips but that is the longest time periods İ know of.

From http://www.energy-daily.com/reports/Utilities_Cant_Ignore_Electricity_Storage_999.html The report evaluates storage system economics in each regional scenario including the effects of regulation, and offers insight into which combinations of technology, application, and region make the most economic sense. Among its key predictions: The storage market will stay fragmented for the foreseeable future. The technology that will prevail in each region depends on the needs in that region. Areas that need help meeting their "peak load" are adopting molten salt batteries, or, where possible, below-ground compressed air energy storage (CAES). Ice thermal storage is finding support in regions where air conditioning (AC) is driven by peak load. Lithium-ion batteries are gaining traction in regions with serious grid stability issues.