Introduction: A Nothing

Step 1: Tt

tt

Step 2:

Step 3: Chilli

Comments

author
nnygamer (author)2013-12-17

TEG aka peltier units? There are some 1.57" (40mm) x 1.57" (40mm) x 0.13" (3.3mm) ones for $8.19 at tmart.com. I was going to get some for a mini fridge next month.

author
Tecwyn Twmffat (author)nnygamer2013-12-17

Great for a fridge project. Note the one's here are designed for electricity generation and will tolerate a constant 325 degrees C.

author
tcarty1 (author)Tecwyn Twmffat2013-12-19

Do the Peltier units not also generate power when used like TEG's, but at about 50% or less of the rated lower at maximum temperature differential?

Sayhpot side is at 70 cel, and the cold is at 10 cel, the differential is 60 cel and the efficiency of a Peltier was 50% of the rated 70w, you might get 30w from a 60 cel difference, but if the difference was only 20 cel, you might only get 10w?

Or am I talking utter baloney??? :-D

author
Tecwyn Twmffat (author)tcarty12013-12-20

Not baloney! Fridge Peltiers can also generate electricity, but only operate at low temps so there wont be much temp difference between the hot and cold side. We need as much difference in temp (Delta T) to get better performance. Currently TEGs are about 5% efficient, which is pretty poor, but it is predicted that this will increase to 20% within 2 years and as much as 50% in 5 years time as the technology improves.

author
nnygamer (author)Tecwyn Twmffat2013-12-18

Quality over hobby version. Limited budget and tools lets me only do simple things. No way could I machine parts like you have.

author
Tecwyn Twmffat (author)nnygamer2013-12-18

Yes it was definitely an expensive project, done more out of curiosity than anything else. Good luck with your project, I'm sure you will be able to do it with much less machining etc. Best wishes for you!

author
russ_hensel (author)2013-12-17

The cells seem to cost about 50 pounds each, making this a cool but expensive project.

author

Very true, but hopefully will become cheaper in years to come.

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Bio: Ugly pirate roaming the seas in search of Treasure.
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