Need help for Peltier modules

Renewable energies except solar electric or thermal (seeforums dedicated below): wind turbines, energy from the sea, hydraulic and hydroelectricity, biomass, biogas, deep geothermal energy ...
johan07
I learn econologic
I learn econologic
posts: 10
Registration: 19/03/16, 12:59

Re: Need help for Peltier modules




by johan07 » 25/03/16, 12:31

Wait, wait,

I never said that it was more profitable than another means of generating electricity.
You have to go back to my first post to realize that I don't have a solar source.

After nothing prevents to make this kind of generator at low cost.

If we think about the long term, the lifespan of a module is 200 hours, which is equivalent to 000 years!
By making it tour only 3 months in the year, I have it for all life.
If I invest in 200 w of generator it will make me 1500 € for the whole life.

Then you have to compare the price for photovoltaics which produces only 7 years before decreasing without counting all the meteorological risks, maintenance ...

Anyway, my subject did not concern the rivalry between Peltier and photovoltaics and I do not want to invest but to build my generator.
0 x
User avatar
Gaston
Econologue expert
Econologue expert
posts: 1910
Registration: 04/10/10, 11:37
x 88

Re: Need help for Peltier modules




by Gaston » 25/03/16, 14:04

johan07 wrote:I don't want to invest but to make my generator.
What this commercial generator shows is that a well designed Peltier generator (we will assume that those which are marketed are 8) ) only works with acceptable performance at a high hot temperature and very efficient cooling on the other side.

  • For the cold side, as soon as we exceed a few tens of watts produced, a liquid cooling is required, the only one capable of removing heat in quantity (several kW of heat for a 100W electric generator)
  • For the warm side, you need a powerful source and well regulated because we operate close enough to the maximum admissible temperature (250 ° C for 270 ° C maximum according to the datasheet). If you operate at a lower temperature, the electric power drops quickly (60W at 200 ° C, 15W at 100 ° C).

In the manufacturing cost, as in the lifetime of the assembly, it is therefore also necessary to include the overheating protection and the cooling circuit.

Now that you know what to expect, if it suits you, go for it :!: : Mrgreen:
0 x
izentrop
Econologue expert
Econologue expert
posts: 13644
Registration: 17/03/14, 23:42
Location: picardie
x 1502
Contact :

Re: Need help for Peltier modules




by izentrop » 25/03/16, 15:08

johan07 wrote:If we think about the long term, the lifespan of a module is 200 hours, which is equivalent to 000 years!
maybe to cool, but at 270 °? : Twisted:
0 x
Valou.saez
I discovered econologic
I discovered econologic
posts: 3
Registration: 27/11/15, 20:48
x 1

Re: Need help for Peltier modules




by Valou.saez » 01/04/16, 00:41

Christophe wrote:
dirk pitt wrote:the performance of a commercial peltier in seebeck mode (electricity production) is at best 2%
therefore to produce 100W it takes about a heat flow of 5000W. by working well the heat exchanges on a boiler of 15kw, it is perhaps what one could recover: 100W


No more than 2%? I thought that the efficiency of a peltier module was better, around 10% ... I must confuse with the efficiency in "cold" mode?

The idea evoked here by Camel1: electricity-electronics-informatics / effect-Peltier-Seebeck-en-generator-t2630-60.html # p39950 which I have taken up here: solar-photovoltaic / solar-thermoelectric-Hub-and-effect-peltier-t14596.html so is not really interesting ...


Heuuu ... I will move the knife a little in the wound, the yield of a Peltier module is 1% ... ^^
It is therefore necessary to count 200w of heat through a module for 2w electric
And the best in your case since you heat your house is to use the cooling water of the peltiers as heating by radiators, the old way !!
Water route plan: Peltiers -> radiator in your house -> exterior radiator-> expansion tank-> return peltiers.
With a fairly long and wide circuit and if your radiators are higher than your peltiers there is not even to use a pump or other circulator, everything is done by itself.
On the other hand if you want to put tens of peltiers on your stove it will already have to make sure that it is powerful enough, otherwise it will not heat anymore ... And you should not lower the temperature of the fumes by less than 300 ° otherwise they become acidic and eat the conduits!

I say this because I was made to place the modules on the exhaust duct ...

I widely recommend 200 ° maximum because beyond it is dangerously close to the melting temperatures of tin, which connects the tens of thermocouples.
The investment is no longer money, but time.
All you need to buy is on eBay, search internationally for low prices.

Otherwise to return to your energy saving approach, I advise you to get started in the fried oil ball burner, 6 months ago I knew nothing about it and today I made one for 0 € that recuperation thanks to this site, and to André who provides up to the burner plans.
But this is only one step, I advise you to create your entire stove!
By doing this already you will heat free, the water and / or the air of your house, and in addition it will allow you to make your own stove and incorporate our famous modules ...
savings

Otherwise I still have this idea of ​​1% profitability which resonates ... Because it also poses the concern of the remaining 99% which ends up in water, which must be used not to waste ... Even if the oil that I cram from wasted : Mrgreen:
I'm suddenly on a half-Peltier project, half-pressure steam to generator turbine.
I block a little on the generator I do not know what power to take I will start with a hydro generator of 10w.
It doesn't even cost 7 € and you can use them as an intermediary for anything that comes from the fleet, that's always it ...
Don't you have a stream near your house by any chance? : Cheesy:

I can detail more if interested, difficult to synthesize my head .. : roll:
0 x
izentrop
Econologue expert
Econologue expert
posts: 13644
Registration: 17/03/14, 23:42
Location: picardie
x 1502
Contact :

Re: Need help for Peltier modules




by izentrop » 01/04/16, 01:07

Good evening,
Valou.saez wrote:I widely recommend 200 °
They are not even made to withstand this temperature since their destination is to make the cold.
Let's say they are found in beer pumps. Their function is only to maintain a temperature of 4 ° by 30 ° maximum outside.
The cask must have been cooled in the fridge before.
60 W is the consumption of the module at 12 V and not the power restored in cold.
0 x
Valou.saez
I discovered econologic
I discovered econologic
posts: 3
Registration: 27/11/15, 20:48
x 1

Re: Need help for Peltier modules




by Valou.saez » 04/04/16, 12:43

Izentrop I can tell you that these TEC-12706 modules hold the 200 ° without problem, provided you have good cooling.
At this temperature I never melted a module. However at 250 ° the margin is too low and I have already seen the wires unsolder and fall all by themselves.
The lowest temperature to take into account is the melting point of the tin, the rest of the components are less soft metals and the 2 plates on each side are made of ceramic.
And still I do not think that they are the most adapted to the functions that one asks of it, just to note their efficiency, other brand produce modules for thermopile use, with better outputs, but their prices are not not attractive, so you might as well start small and the days when you feel "like a boss" with your modules, nothing prevents you from investing ...
But before that, everything except thermal paste can be recovered or made. Just invest your time and don't wait for it to fall from the sky.
Izentrop I do not capture the interest of your message, apart from demotivating the troops .. :frown:
There is nothing negative or impossible, with a single module you already have enough to never plug your phone into an outlet, just do not be too hungry for energy and control its expenditure ... Nothing good complicated so far.
0 x
izentrop
Econologue expert
Econologue expert
posts: 13644
Registration: 17/03/14, 23:42
Location: picardie
x 1502
Contact :

Re: Need help for Peltier modules




by izentrop » 04/04/16, 23:43

It will only last a while at this temperature.
It is given to support 90 ° and resist peaks at 138 ° http: //www.sunrom.com/p/thermoelectric-cooler-peltier-tec1-12706

You do as you like, but a small solar panel will be more effective for less.
0 x
johan07
I learn econologic
I learn econologic
posts: 10
Registration: 19/03/16, 12:59

Re: Need help for Peltier modules




by johan07 » 17/04/16, 21:58

Hi,

First thank you for reading my first post. I HAVE NO SUN IN WINTER SO IT SHOULD STOP ADVISING ME OF PHOTOVOLTAIC PANELS.
FYI I do not pay the wood.

I made a second prototype. I went up to 15.5 volts with 8 modules.
By cons I always have an intensity of 0.08A.
Please answer this question.
How to find modules that produce more intensity?
Is it enough to choose modules that are advertised with greater power than the 12706 modules?

Please answer this question. If you want to debate whether it's worth it or not, there are already forum who talks about it. I let you go to these to give your opinion.

Good night.
0 x
izentrop
Econologue expert
Econologue expert
posts: 13644
Registration: 17/03/14, 23:42
Location: picardie
x 1502
Contact :

Re: Need help for Peltier modules




by izentrop » 17/04/16, 23:54

Hi,
A file on thermoelectric generators: http://glasscockpit.free.fr/pdf/conf030210fontanell.pdf
0 x
izentrop
Econologue expert
Econologue expert
posts: 13644
Registration: 17/03/14, 23:42
Location: picardie
x 1502
Contact :

Re: Need help for Peltier modules




by izentrop » 18/04/16, 00:41

For the low efficiency obtained in seebeck mode, Viessmann markets a good thermal and electric cogeneration boiler http://www.viessmann.fr/fr/chauffage-ba ... 300-w.html
It's a serious company, but not found the stirling engine with its only linear generator that you could adapt on your stove.
http://www.photology.fr/moteur_stirling ... inear.html
Pellet and electricity http://www.okofen-e.com/fr/technologie/
0 x

 


  • Similar topics
    Replies
    views
    Last message

Back to "hydraulic, wind, geothermal, marine energy, biogas ..."

Who is online ?

Users browsing this forum : No registered users and 263 guests