Is it possible to harvest energy from fluid buoyancy?

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Discussion Overview

The discussion revolves around the feasibility of harvesting energy from the buoyancy of helium balloons. Participants explore theoretical mechanisms for energy generation using buoyant forces, including the potential use of a generator connected to a balloon via a rope. The conversation touches on concepts of energy efficiency and the practicality of such devices.

Discussion Character

  • Exploratory
  • Debate/contested

Main Points Raised

  • One participant proposes a device that uses a helium balloon to generate electricity by tying a rope to a gear connected to a generator, suggesting that the upward movement of the balloon could produce energy.
  • Another participant points out that once the balloon reaches its maximum height, it would stop rising, questioning the continuous energy generation aspect of the idea.
  • A suggestion is made to create a mechanism that automatically deflates the balloon when it reaches the top, allowing it to drop and be reused, although this raises further questions about energy consumption in the process.
  • Concerns are raised about the practicality of such a device, particularly regarding the energy required to compress helium for reuse or the cost of continuously supplying new helium.
  • Some participants emphasize that the discussion touches on concepts related to perpetual motion, which is not permitted in the forum, indicating a consensus on the limitations of the proposed idea.

Areas of Agreement / Disagreement

Participants generally agree that the proposed energy harvesting method faces significant challenges and limitations, particularly regarding the principles of energy conservation and the impracticality of perpetual motion. However, there are differing views on the specifics of the mechanism and its feasibility.

Contextual Notes

The discussion includes assumptions about the efficiency of energy conversion and the practicality of using helium, which are not fully explored. There are unresolved questions about the energy costs associated with the proposed methods.

Ahmad Esber
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So I've noticed my little sister's helium balloons floating at the ceiling. Made me wonder if someone could create a device that could harvest energy from this buoyancy. What if I tied a very long rope to a huge balloon filled with helium, and rolled the other end of the rope to a gear attached to a generator of sort. As the balloon goes up, the rope would rotate the gear, generating electricity. Would that work? more importantly, would it be efficient to make such a device?

English isn't my first language, so I apologize in advance!
 
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But once the balloon is all the way up, then it stops.
 
Khashishi said:
But once the balloon is all the way up, then it stops.
What if we made a device that automatically deflates the balloon when it reaches the top? The balloon drops to the ground, tie the rope again.
 
Ahmad Esber said:
What if we made a device that automatically deflates the balloon when it reaches the top? The balloon drops to the ground, tie the rope again.
We do not discuss perpetual motion here. Not even to tell you why it cannot work.
 
So, either you are compressing the helium at the top (which takes energy) to reuse it, or you are just letting the helium escape and filling it with new helium at the bottom. Well, you quickly run out of helium that way, and it costs too much to harvest new helium.
 
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jbriggs444 said:
We do not discuss perpetual motion here. Not even to tell you why it cannot work.
Correct.

@Ahmad Esber -- Please follow the links in the quote below from the PF list of Banned Topics. They should help you understand why your idea will not work. Thread is closed.

Banned Topics said:
Pseudoscience, such as (but not limited to):

Perpetual motion and "free energy" discussions
http://wiki.4hv.org/index.php/Free_Energy_Debunking
http://en.wikipedia.org/wiki/Perpetual_motion
http://www.skepdic.com/freeenergy.html
http://www.skepdic.com/perpetual.html
 
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