4 ms·
To what extent could you pressurize the water to restrict the volume? I can imagine an egg timer style device with heavy pressurised immiscible liquids and some
by throwawayaway 12y ago
To what extent could you pressurize the water to restrict the volume? I can imagine an egg timer style device with heavy pressurised immiscible liquids and some turbine in the middle that you turn over physically instead of pumping.
someone has already had the idea:
http://www.myfreeinventions.com/electricity-generation/portable-hydroelectricity-generator-for-remote-areas-made-from-recycled-parts/ http://www.myfreeinventions.com/electricity-generation/porta...
oh here's another one - might be interesting to strap two of these together:
http://fivegallonideas.com/hydroelectric-generator/ http://fivegallonideas.com/hydroelectric-generator/
- sanxiyn 12y agoWell, air compresses better. People are trying to store energy in compressed air. I found LightSail Energy to be interesting. http://www.lightsail.com/ http://www.lightsail.com/
- gus_massa 12y agoFrom http://en.wikipedia.org/wiki/Properties_of_water#Compressibility http://en.wikipedia.org/wiki/Properties_of_water#Compressibi... > The low compressibility of water means that even in the deep oceans at 4 km depth, where pressures are 40 MPa, there is only a 1.8% decrease in volume. With some simplifications, the stored energy is approximately P*deltaV/2 (when P>>1atm), where P is the pressure and deltaV is the volume change. So in 1 litter (1/4 galon) at -4Km, the energy is only 400J (.1Wh), and you need submarine grade technology to store it. The potential energy of 1 litter (1/4 galon) of water at 40m (130 ft, a 15 story building) is also 400J (.1Wh) and is much easier to build.
- pantalaimon 12y agothe volume of a liquid hardly changes under pressure.