105. RE: Windbelt, Cheap Generator Alternative, Set to Power Third World
I'm not that impressed. 50 milliwatts is nothing. I have a propeller generator that will produce more power in low wind. There is not enough room fot the magnet to travel to develope usable power. Nothing will become of this. Lets have some details, how many volts at how many amps, under what conditions.
78. some really stupid commenters
Do people have any idea what 0.04 Watts at 10 mph means? It's a *micro*power device! When you need 100 Watts, get a wind turbine for $500, not several thousand of these. And fools who propose sticking these on cars (which already have huge alternators and 12V outlets) or next to laptop fans (which already have batteries and powered USB ports)... learn about conservation of energy.
67. Great!
This is a vary cool idea! Not only that but its well thought out. (All credit to Wikipedia for without it I could not argue a valid point) The point "it doesn’t generate much energy" keeps popping up, so ill see if I can put some facts into the fight. The power available in the wind is given by: (for a Turbine) P = 0.5A Rho r^2 V^3 Where: P = power in watts, A = efficiency constant, Rho = mass density of air in kilograms per cubic meter, (Mass density is worked out as – Rho = Mass / volume) r = radius of the wind turbine in meters, V = velocity of the air in meters per second. So for R=30 Meter's (average inland turbine blade radius) V = 10 mph (16 km/h or 4.5 m/s) (The average speed at wind farms) Rho = 1.225 (At 15*C at sea level) A = 30% (because I don’t know the true figures here I am using a figure someone mentioned earlier) P = 0.15*1.225*900*91.125 = 15069 watts (15Kw or 15,069,000 milliwatts) For the Wind Belt Looks to measure about 80 CM * 10 CM * 10 CM or there about’s Apparently generates 40 milli watts at 10 mph So in its current state if you built a wall out of them 80 meters across and 60 meters high (to match the un-usable area of a turbine) you would generate Number of units = 60000 (80 meters / 10 CM) * (60 meters / 80 CM) 40Milliwatts * 60000 units = 2,400,000 milli watts So to conclude, no it doesn’t generate as much power as a turbine. But Its easier to repair, and requires less land to be dedicated to its use, its cheaper and its user friendly. A good product for an unexplored market
19. RE: Windbelt, Cheap Generator Alternative, Set to Power Third World
Website: http://ww.com/
I'm sorry but this device is not 10 to 30 times better than then the best microturbines, which are over 20% efficient. Betz' limit is not about to be crossed, no matter whether it is with rotating or vibrating devices. I predict this invention will not 'break' because it it tuned to only a narrow range of windspeeds and wildly inefficient compared to modern rotary machines. Nice try though !