Instructables
Picture of Mini Peltier Air Conditioner (Plans)
This Instructable will show you how to make a environmental friendly portable air conditioner. This machine uses a Peltier Module as a cooling  mechanism and some cooling fans for blowing air.
 
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Step 1: Here is a Picture How It Works

Picture of Here is a Picture How It Works
This is just like the everyday air conditioner that we use. The only thing unique about this that the cooling unit has no moving parts. The only moving parts here are the PC fans.

Step 2: Needed Parts, Tools and Materials

Picture of Needed Parts, Tools and Materials
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This page shows you the things that you need that you need to buid this machine.

Step 3: Ilustration

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Step 4: Notes Before Starting

Picture of Notes Before Starting

Step 5: Electrical Wiring

Picture of Electrical Wiring

Step 6: Attaching The Heat Sinks

Picture of Attaching The Heat Sinks
Put epoxy on both sides of the peltier module and connect the heat sinks together.
Note: Copper paste would be better.

Step 7: Attaching The Fans

Picture of Attaching The Fans
Put epoxy on the heat sinks and connect the two PC fans to the heat sinks.

Step 8: Attaching The Wood

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Attach the wood with epoxy.

Step 9: Attaching The Wood and The Metal Net

Picture of Attaching The Wood and The Metal Net
Use Epoxy

Step 10: Attaching The Wood

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Use epoxy.

Step 11:

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Step 12: What It Looks Like

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Step 13: How To Use It

Picture of How To Use It
Use the tube for better ventilation.
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a good improvement would be to water cool the hotside of the peliter and to put the radiator outside. peltiers use alot of electricity, they use 100w to move 100w of heat roughly.

It is fun to read comments from some of the users. No offence but many don't know about peltier at all. I have been playing with them for past 2 months. They catch your attention when you see them at work.
First of all, do not connect peltier with a battery. It will overheat and fry.
Attach a heatsink or someother mechanism like water flow to keep its hot side cold.
Which one is hot side and which one is cold?
The side with text written is usually the side that gets cold when current is applied.
I am in China and its super easy to buy them. You will not be able to get them from local stores, try online shopping websites.
All peltiers can create electricity as well if you create temperature difference between its both sides. Warm its warm side while keep cold cold.
To start with them by the TEC-12706 its should be dead cheap like under 5$

5 for $10 at ebay ;-)

TrygveLyesterday

Any reason why there are two heatsinks at the cold side, or is it just what was available?

I have ordered a peltier element to do something similar(but to dry the air).
Mounting the cold side at the top might be unvise. Reason is that the cold side will get condensation that will flow downwards and might creep into the electrics.

My plan is to mount it ideways, and thinking that at least the cold fins should face downwards. Also that there should be some kind of reservoir.

I am a professional designer and user of TEC/Peltier modules

This instructable, whilst very enthusiastic, and very nicely illustrated won't work as advertised. Moving HEAT is not the same as creating a temperature difference.  A Peltier cell will only create a maximum delta T of about 50 C, and pump NO heat, or it will pump its "rated power" at ZERO delta T. In truth, getting 25 C at half power, in normal ambients is doing well.

Real airconditioners can cool more than their electrical input, Peltier cells can't technically, the Coefficient of performance of a real aircon is >> 100%, for a TEC< 100%.
Doesn't a device with COP > 100% break the laws of thermodynamics? Seems like if that were true, you'd be able to harvest the difference in output to power the system, which... you obviously cannot.

At least in theory it should be possible to make a heatpump power-plant. The energy is absorbed from the surroundings. The problem is to make enough heat to run a small power-plant with losses here and there, with a fairly expensive setup(compared to potential production).

A heatpump regularly has a COP above 3, for heating purposes(1 part electric=3+ parts heat output, depending on outside temperature).

Its easier to point you at Wikipedia than to explain here, but suffice to say, no, thermodynamics isn't violated. ........
junits154 years ago
something like this is usually very hard to get working, because there are some many things that can go wrong. fans heatsinks power supplies. I have a peltier and a watercooler for it, but i still cant find a 12VDC 14 amp power supply. :(
oh oh oh u could make the 14 amp supply from an old microwave transformer just chisel away the smaller 2000 volt windings and wrap it with some 10 gauge wire until it puts out 14 amps at 12 volts but i think that wire thickness determines the amount of amps idk im not sure and u could just buy some beefy diodes to make the voltage dc and a capicitor but on the other hand is it possible to force too power into a peltier or will it just use what it needs?
u can also buy an rv power converter they usually put out around 45 amps

You can use a Computer SMPS, there is absolutely no problem with that. Go ahead. (y)

ive actually already got a power supply :) my xbox 360 just dies so Im taking the power brick from that is has a 16 amp 12v rail and a 1 amp 5 volt rail
ur lucky. im gonna try my idea and if ur peltier takes 14 amps wont the 16 amp power supply fry the peltier?

mr. clean. Power supplies supply power. They are like a source. Devices pull what they need from it. so 14 A module will only pull 14 A from power supply :)

no 16 amps is the max current that can be drawn from the psu, 14 amps os the amount the TEC will draw, so it wont fry. btw you can get 360 PSUs on ebay for $15-$20
Ok thanks now i don't have to worry and that's a good idea i think i will get 1 of those or i could make a power supply (its gonna be a giant wallwart) and i could spend the money on a giant peltier idk.
do whatever you want :) It's all for fun anyway.
Rottom junits153 years ago
try amazon, ebay, ask.com,google.com
junits15 Rottom3 years ago
I already got a power supply a loooooong time ago, its an xbox 360 psu, those things are awesome!
A lot of computer power supplies will do this no problem.
iurius junits153 years ago
You should use two (or 3) power supplies together with more peltiers.
tim.raynaud2 months ago

how big is this unit...once it's built? how portable is it?

rmckay57 months ago
Hi,
I'm trying to make something very similar to this design, but I'm having some wiring problems. Peltiers are really hard to find where I live and the only one I could get my hands on has no markings and no instructions - the only thing the seller knew about it is that it's 12v. I have a 12v 3.3A DC adaptor and when I wire it all up in parallel the LED on the adaptor blinks, the peltier works, but the fans just twitch like they're trying to start but can't. When I wire it in series it all works fine, but the peltier doesn't get very hot/cold at all. Is my DC adaptor amperage too low or too high? Any suggestions would help!

your power supply indeed has a to low current. the reason its blinking is becous it shuts down do to the lack of power / starts up for a second and then shuts down again ( this is the easiest way to say it its actually more complex) thats why your fans are twitching. if you wire it in series the current is to low for your peltier do to the fans that requir less current.

locatehemant6 months ago

I hace recently purchased TEC1 12706. Provided power input to it from a 300 W SMPS. Volatge 12 V. Room temperature was ~35 degree . Heat sink and fan applied on hotter side that of CPU hitsink and fan . When I tried to measure the DC current ... using clamlmeter it showed reading to be nearly 1.6 A for peltier . I think it should consume 6 A why it is consuming less current.

plucas18 months ago

a few notes, a radiator with water on hot side would be great addition. as your design is you are blowing both hot and cold air into a room (I admit they are blowing in different directions though) with a water setup on the back you could take the heat outside and let the air blow on it to cool it down. the addition of several items like a pump will be required.

also using 2 or 3 peltiers piggy backed will be better than 1

and last but not least is you may encounter an icing issue.

zeeshanudsd11 months ago
hi
i want to know if i want to use it as heater what will i do b/c whenever it is used for cooling heating side is connected to the heating side so if we reverse the polarity than cooling side become hotter so is there heat sink is required for heating side?
naufanmaker11 months ago
attach it on the computer... 28c idle 60c full load!
ASCAS (author)  naufanmaker11 months ago
Now that's a great idea!
or use thermal tape double sided, wich would be better. then u could take them apart. if u screwed up on some thing.
ampeyro3 years ago
how expensive is one of this peltier coolers?
http://tegpower.com/
go there and check them out
The prices on these can be from a few dollars to a few hundred. You have to choose your sources well.

Personally, I find that eBay has the best prices. I just bought two modules and each cost about $4, free shipping.

http://cgi.ebay.ca/Cooler-Peltiers-TEC1-12706-Thermoelectric-Fine-12V-60W-/280705809456?pt=LH_DefaultDomain_0&hash=item415b5ebc30
http://tegpower.com/ there they have them from 25$ units up to 2000.00$
well one good place is to check out this link http://tegpower.com
go there is yr looking 4 thermal electric generators. yr looking at 85% heat conversion or soo

cutshopguy1 year ago
What awesome presentation. A pleasure to read. Well done.
pavelow2 years ago
If you follow the instructions you will fry your peltier. I just fried mine. A 7AH cell in good working order will overpower it within about 30 seconds. Melted the solder right out of the side before I knew what happened. (And yes I had a substantial heat sync). You need something to limit the current if you are going to use a battery.
depends on the voltage you supply the peltier with- but I would agree generally it would be better to limit the current somehow. But you can measure the resistance of the peltier when it's at room temperature, and calculate the expected amperage at whatever voltage battery you use (V=IR).
A peltier doesn't work that way. It's like a diode- it's made of semiconducting materials, therefore different rules apply. First, here's a quick comparison of voltage (or "potential difference") versus current for resistors, diodes and filament lamps: 

http://www.bbc.co.uk/schools/gcsebitesize/science/add_edexcel/controlling_current/resistancerev2.shtml 

In a graph of voltage vs current, the derivative (i.e. the slope) of the line at any point is the resistance. When the graph is steep, the resistance is high. This comes from V=IR (in this case, it makes more sense as V / I = R). Now, lets take a look at a more detailed generic voltage (V_D) vs current (I_D) graph for a diode: 

http://tinyurl.com/diode-graph-jpg

As you likely already know, when you connect a peltier to a power source, one side gets hot and one gets cold. If you apply a negative voltage (i.e. switch positive and negative), the sides essentially switch. You can see this in the graph- notice what the current does when you go further left, giving a negative voltage. These two regions are labeled in the graph as the Forward and Reverse regions. 

As you can see from this graph, a peltier's electrical resistance varies exponentially as the voltage changes. That's why you can't approach the problem this way (unless you have some expensive lab equipment like a curve tracer that could model your peltier for you). 

So how do you avoid frying your peltier? You don't limit the current (directly, at least). Instead, you limit the voltage by putting a resistor between the battery and the peltier. You need to use the correct resistor- you can either do the math or find a calculator online to determine what resistor you need in order to make the voltage whatever your peltier is rated for. You want to get as close to the right voltage without going past it... look at the graph again- the correct voltage for your peltier is labeled as the "knee voltage." What happens if you are just below the target voltage? Your peltier will simply not get very hot/cold. But what happens if you are just above the target voltage? Your peltier will melt your face off. 
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