How does the heating process work and can it be reversed?

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    Heating Process
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Discussion Overview

The discussion revolves around the heating process in electrical heating elements and the potential for reversing this process to generate electricity. Participants explore the mechanisms involved in heating, the efficiency of energy conversion, and the underlying physics at the atomic level.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions why it is not feasible to reverse the heating process to generate electricity, suggesting a challenge to the understanding of energy conversion.
  • Another participant asserts that it is possible to convert heat back into electricity, albeit with low efficiency, referencing radioisotope thermoelectric generators as an example.
  • A different viewpoint emphasizes that heating elements operate through resistance, implying that the process is largely irreversible and results in energy loss.
  • Participants discuss thermocouples, noting that they require two different materials and a temperature difference to function effectively, which raises questions about their applicability in reversing heating processes.
  • One participant expresses curiosity about the actual mechanisms at the electron or atom level that contribute to the heating process, seeking a deeper understanding beyond the concept of resistance.

Areas of Agreement / Disagreement

Participants exhibit a mix of agreement and disagreement. While some acknowledge the possibility of converting heat to electricity, others emphasize the irreversible nature of heating elements, indicating that multiple competing views remain in the discussion.

Contextual Notes

There are limitations in the discussion regarding assumptions about efficiency, the specific conditions required for energy conversion, and the definitions of terms like "reversible" in the context of thermodynamic processes.

Who May Find This Useful

This discussion may be of interest to those studying thermodynamics, electrical engineering, or anyone curious about energy conversion processes and the physics of heating elements.

motorman
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Hi guys,

For today's lunchtime challenge...

If I put 1kw of electrical energy into a heating element and get X amount of heat out, why can't I put ~X amount of heat into the element and get ~1kw of electricity out? ( I accept less than 100% reverse process ability)

what's the mechanism that goes into heating and can it be reversed?

ATB,
motorman
 
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A heating element works via resistance so it is basically all loss and completely irreversible.
 
Thanks for your replies all.

I was thinking Thermocouples would creep in there somewhere, however they need 2 different materials to do the job and a temperature difference to make it(them) work.

I'm thinking about a heating element and how it works. We're taught that it is all about resistance, but what is the actual mechanism at the electron/atom level?
 

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