63 results found displaying 43-45
    
Colin Gross
 United Kingdom
Green Energy from the rise and fall of tides Printer Friendly Version
Background: Every object that floats in tidal areas (harbours, the sea, etc.) moves up and down with the tides. The energy that is required to lift the object and the energy disipated as the object descends is all wasted. (Imagine the energy required to lift a relatively small 2000 tonne barge.)
Practical Application 1: This energy can be harvested by connecting the object to a harbour wall or seabed. The relative movement between the fixed harbour wall etc. and moving object can be made to pressurise hydraulic fluid, this can operate an hydraulic 'wobble pump' which turns a generator.
Practical Application 2: In its simplest form this electrical energy would be cyclical, in line with 'still' high and low tides. In this simple form the energy could be sold to a national grid.
Practical Application 3: There are approx. 1500 harbours around UK. Most of them have underutilised harbour walls (built prior to the shrinking of our fishing industry). The oil industry alone discards many barges as 'unseaworthy' and sells them for scrap. A 'nodding donkey(s)' based on a harbour wall, one arm attached to a rising and falling barge and the other to a hydraulic piston(s) would produce the pressurised fluid necessary.
Practical Notes:
- Most forms of 'green' energy are complex and expensive. This one is DIY in its basic form and should provide money from selling power to the grid (in UK).
- The floating body should be relatively wide and long (not deep draught). Hence the 'barge' suggestion.
- To stabalise the electrical output - generator output could be passed to the windings of a bank of alternator/flywheels. Ideally, these would be rotating in a vacuum and suspended by magnetism (giving zero mechanical friction).
Reward: That if this idea is put to use and developed, that process in no way limits other users from using and developing this idea. 

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36°

    
avh
 Netherlands
Many wind turbines, one generator Printer Friendly Version
Current wind turbines are EACH equipped with a generator and a gearbox. We know large generators (such as used in electricity power plants) are more efficient, would it make sense to connect an array of wind mills via driveshaft to one large generator on the ground.
Advantages:
1) high(er) efficiency generator
2) use only one big generator, not many small ones
3) big generator on the ground is easy to maintain (no climbing in towers)
4) individual wind mills can be cheaper (basically rotor, nacelle, tower and driveshaft)
5) total cost of such a wind energy cluster may be cheaper.
Obviously some energy is lost in transporting mechanical energy via driveshafts. But since wind itself is free and if the total cost per generated kW is cheaper in this configuration - it might bring down the price per kW in this cluster configuration.
Reward: I believe that any idea that can help our civilization to survive the inevitable fossil fuel energy crisis should be voluntary donated asap. If this proves to be one - please use it! 

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33°

    
rabuc
 USA
Home recycler Printer Friendly Version
Develop a home recycler which will take all of your recyclable material and crush, grind, reduce, compact and store the material until you are ready to dispose of. I suggest the following criteria:
- Items to dispose of - wood, plastic, glass, metals
- Must be a system inexpensive enough for the average home
- Must be easy to operate and by one person
- End product must be ready to dispose of, preferably able to sell the product to local recycling establishment.
Reward: I'd like ot participate with anyone that would like to develop this concept further 

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32°

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