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Old 01-16-15, 09:00 AM   #9
Ator
Lurking Renovator
 
Join Date: Jan 2015
Location: Netherlands
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Peltiers used to generate electricity are not very efficient and produce more power when the difference between the hot and the cold side is larger. So using the waste water to generate electricity would probably be less than 1% efficient. However I wish to use them as heat pumps and then a small dT would be most efficient in that case.

Quote:
The heating coefficient of a TE heat-pump reached
1.6~5.5 if the temperature difference of heat
mediums was limited in the range of -10~15 o C. (bse.polyu.edu.hk/researchCentre/Fire_Engineering/summary_of_output/journal/IJAS/V6/p.173-177.pdf)

I do believe that a compressor will be more efficient, but the work and tools involved will probably make up for the improved efficiency. Since peltiers are cheap, I think I might order a couple to do some tests on them and report back on the forums. Seems like no one really has any hands on experience with them.
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