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| first law of thermodynamics, generating electricity |  | ||
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| Posted by: fraones ® 01/30/2007, 18:39:27 Author Profile eMail author Edit |
Hey, is there anyone that can help me out? I am designing an air powered rotary motor (almost like a Tesla, but only one wheel and it uses compressed air to move it). My group also has to come up with applications we can use it for. I suggested using the motor to rotate a shaft at high rpm (maby 10,000 rpm) with an assembly of proper magnets and coils, to generate electricity. Now concerning the law of conservation of energy, could this generator put out more volts than the volts used to power the air compressor? The air compressor once turned stores energy, so that the comp. is not running all the time, and the 120 volts is not directly powering the motor, as the compressed air is. For example, we would use a 120 volt air compressor to power the motor. I am convinced if the motor is in the high 90s for efficiency, and using the proper magnest and coils, i could generate more than 120 volts. Is this wrong? If someone could answer me ASAP it would be greatly appreciated. |
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| Re: first law of thermodynamics, generating electricity -- fraones | Post Reply | Top of thread | Forum |
| Posted by: stewart ® 01/30/2007, 20:32:38 Author Profile eMail author Edit |
You will get less total energy out in proportion to the mechanical and electrical inefficiencies. You can however get more than 120 volts. Stewart Modified by stewart at Tue, Jan 30, 2007, 20:36:59 |
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| Re: Re: first law of thermodynamics, generating electricity -- stewart | Post Reply | Top of thread | Forum |
Posted by: randykimball ®  01/30/2007, 22:40:06 Author Profile eMail author Edit |
True, ... think for a moment... you are running on air.. the voltage the compressor ran on has nothing to do with your output. However, the amount of energy spent to store the air (stored energy) has everything to do with the total amount of energy you have to spend. You can use it quick and powerful, or with lots of consideration for low power for an extended time period... or anything in between. If you have x amount of air stored up in a huge tank you can use the pressure to drive your "turbine" to the extent that it runs out of enough air. ..but, you will never get more energy out of the tank to drive anything than it took to store the air in the tank. There are losses, you can reduce the losses, but you will have losses. However, you can produce large amounts of power from the air for a few minutes. For example, if you used the air to power a piston steam engine, you could get huge amounts of torque. Or.. if you powered an air cylinder you could move huge amounts of mass... until your air supply is consumed down to the critical mass to do that work load. Then the compressor must work for a long enough period to resupply the energy bank (compressed air). .. or.. if you want to run constantly you must do your work with less CFM than the compressor produces. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. Modified by randykimball at Tue, Jan 30, 2007, 22:46:48 |
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