How to transfer heat dissipate by heat sink into one spot

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Discussion Overview

The discussion revolves around the challenge of efficiently transferring heat dissipated by a heat sink into a thermionic converter for electricity generation. Participants explore the feasibility of concentrating heat from the heat sink and the role of an adapter plate in this process.

Discussion Character

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

Main Points Raised

  • One participant proposes using a thermionic converter placed at the bottom of the heat sink fins to convert dissipated heat into electricity, but notes the converter's size limitation.
  • Another participant suggests using a copper adapter plate to match the size of the thermionic converter, while cautioning that these converters have low efficiency, typically only a few percent.
  • A participant expresses a desire to understand the concept of an adapter plate, asking about its appearance, functionality, and applications in the context of heat transfer to the thermionic converter.
  • Another participant raises critical considerations regarding the temperature and power dissipation of the system, indicating that low temperature differences and low power levels may render heat harvesting ineffective.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the effectiveness of using an adapter plate or the viability of harvesting thermal energy from the heat sink. Multiple viewpoints regarding efficiency and practical implementation remain present.

Contextual Notes

There are unresolved assumptions regarding the specific temperatures involved and the actual power dissipation from the heat sink, which may affect the feasibility of the proposed solutions.

DigiDigi
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I am trying to convert all the heat dissipate by the heat sink into electricity by using thermionic converter. I plan to put my thermionic converter at the bottom of the heat sink fins. However, my thermionic converter is not big enough to cover the entire area of the heat sink fins. Is there anyway I can concentrate all the remaining heat released into the thermionic converter?
 
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Welcome to PF!

Sure, you can use a copper adapter plate that is the size of the converter. However, these converters are only a few percent efficient, so you won't get anywhere near 100% conversion.
 
Thank you for your reply. Forgive me for being ignorance, but may I know what is an adapter plate and how does it look like. I google image and it seems to me they come in many shapes. Also, theoretically speaking, how does adapter plate work especially in my case for example, how will it help me gather all the heat from the heat sink into the thermionic converter. Where can I usually find the application of adapter plate? Sorry for asking too many questions, I want to learn and know more about this adapter plate since I am not familiar with it.
 
Before you go through the trouble of trying to harvest thermal energy from the system, look into two things:

  1. What is the temperature? Based on the Carnot efficiency calculation, you can guess at what your maximum efficiency can be. (hint: if you're only operating at 10 or 15 degrees above ambient, it isn't worth it...)
  2. How much power is being dissipated in the first place? is it 1W? 10? 100? Just because something is warm or hot doesn't mean there is a large amount of heat flux to be harvested.
 

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