Electric energy from thermocouples

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Discussion Overview

The discussion revolves around the concept of generating electrical energy using thermocouples, specifically through the arrangement of multiple contacts on a wire that are subjected to different temperatures. The scope includes theoretical considerations, practical applications, and efficiency concerns related to thermoelectric generators.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes that creating multiple contacts on a wire and applying a temperature difference could generate useful voltage.
  • Another participant confirms that this concept is known as a thermoelectric generator, noting its inefficiency but acknowledging some practical applications.
  • A different viewpoint suggests the inclusion of thermionic converters in designs, particularly for automotive applications, while questioning the cost-effectiveness of such implementations.
  • There is a query about the inefficiency of thermoelectric generators, with a request for clarification on the need to connect them in series or parallel.
  • A response indicates that the choice between series or parallel connections depends on whether higher voltage or higher current is desired.
  • Another participant elaborates on the reasons for inefficiency, citing factors such as thermal conductivity, electrical conductivity, and the Seebeck coefficient of the materials used.

Areas of Agreement / Disagreement

Participants express varying views on the efficiency of thermoelectric generators and the practicality of their applications. There is no consensus on the best configuration for connecting the thermocouples, as it depends on the specific requirements for voltage or current.

Contextual Notes

The discussion includes assumptions about the efficiency of thermoelectric generators and the specific conditions under which they might be used effectively. The limitations of the materials involved and their properties are also noted but not fully resolved.

Brainiac
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If I were to make millions of contacts or "spots" on a long wire,and connect them in series(or parallel?),then make half of them warmer than the other half,would I get any useful voltage,i.e. electrical energy I could use to power something?
 
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Yes, this is known as a thermoelectric generator. They are rather inefficient heat engines, but they do have some practical applications.
 
I always make allowances for the inclusion of thermionic converters in appropriate circumstances for things that I design. For instance, wrapping the hottest parts of an automotive exhaust system in a blanket of them can provide enough juice to run your radio and GPS at least, and perhaps more. It really wouldn't be cost effective, but it might save a small fraction of a mpg via decreased electromagnetic drag upon your alternator.
It's a fun exercise, but not worth doing in reality.
 
DaleSpam said:
Yes, this is known as a thermoelectric generator. They are rather inefficient heat engines, but they do have some practical applications.

But why is it inefficient? Also one little question: would I need to connect them in series or parallel?
 
Brainiac said:
would I need to connect them in series or parallel?
That depends upon whether you require more voltage or more current.
 

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