40w 12v Peltier Air Heater - Energy Efficient




About: engineering student in electronics and communication ... love to make things which makes life easier or the substitute of costlier things .. always try to make energy effecient and environmental things to ma...

In this i had used the heating effect of peltier .. many of us have knowledge about the electronic device peltier. it is basically made by the P-N juctions inside which makes the temprature difference when electricity is passed through it.
i had used TEC1-12706 which have 127 PN couples in it and can withstand till 6A current..
configuration of 12706 peltier are used nicely to produce freezing point temprature becoz of temprature difference it produce .

sorry for nazi english ...

Step 1: Required Things

There the required things as mention below:-
1. TEC1-12706 peltier: if u have other type of peltier that can be used.

2. Power supply: I used old computer power supply which works really nice for my peltier heater.
power supply able to give 12volts with nearly 5amps.

3. Aluminium heatsink: Prefer to take a more fins heatsink and gaps between these are enough for air flow.

4. DC motor: use any dvd player motor becoz they are silent and able to work for long time

5. Plan plastic sheet

6. pvc L shape bend

7. connecting wires

For fan speed controller:
8. LM317
9. resistance - 100ohms, 1kohm pot
10. capacitors- 0.1uf, 10v 100uf

Step 2: Making of Fan Blade

Take a plastic little sheet . as i got from oil bottle .
Using compass make the circle of 8mm and another big circle equal to the pvc pipe mouth radius.

Now make the lines on sheet with marker. I made 16 fins. so draw lines and cut them by blade or scissor.
now just twist each blade in one direction so they are slightly twisted ..
shown in figure that how the air will goes out.

u can also get another kind of blades on this instructable


Step 3: Work With Dc Motor

Take your breadboard wires and remove those insulator by this u will get inner thick aluminium wire and now cut that wire into pieces of 15cm each .

now tie each wire on dc motor and make them enough tight so that they will not come out.

tie another wire at angle of 120degree and third pair on 240degree. i used the pair wire at each angle so the vibration will b less and useful in next post.

Apply epoxy on wires so that. they will not move .. it takes some time so just wait to get it hard enough.

Now attach the fan blade on motor. add some epoxy so blade not removed in future.

by this your fan is just ready.

Step 4: PVC Bend

take the pvc bend and make hole pair on plain surface at each 120degree.

now put those aluminium wire to pass through each holes and fan must b inside tube.

fix the motor such that its blade not touching inner surface and wire are tighten enough..

Step 5: Heatsink Set

Take heatsink and place in on the other side of tube .. it must be like that so the all air only pass through fins.

Put it on pvc tube and mark the area and remove all pvc part between those mark so that heatsink can be setted there .. i had removed pvc by solder iron.
make another hole on side of pvc and make the wire band to heatsink on.both side to make little permanent system.

Step 6: Peltier Attaching

To attach the pelteir add some thermal flux on peltier and put it on heatsink .. becoz improper use of thermal paste can cause of peltier heating of low heatsink heating.
Take out the wire by tube hole which made in pvc tube.

Step 7: Final Packing

Becoz the air only to be pass through heatsink fins so there no leakage in air pass..

heatsink not coverd the whole pvc so remaining area can be coverd by mold of that size or as i cover by tape .

also dont forget to cover over the fin area by this all air comes out after touching fins. This makes heating of air more efficient.

Step 8: Air Flow Control

Air flow control is done by regulating the speed of dc motor -> which is done by regulating dc voltage.

to regulate dc voltage i used LM317 ic which easily regulate the voltage over 3-10volts as mentioned above circuit.

there input can be12v output from computer supply .. transformer can not be used in peltier becoz they cant give enough current for peltier.

Step 9: Power Supply

i had used old computer power supply by which i get enough power to run whole system ..
to start the supply short the wires of green and black.

by connecting the power system and starting the system than in opposite side temprature is gone below freezing point so there ice crystal are started forming.

after use of 7 hours there a bulk of ice crystal is made.

this system uses 2.85amps at 12volts input supply.


if u want more heat in heatsink than add another peltier with thats hot side attached to the cold side of already placed peltier now connect new peltier by 5volt supply becoz if connected by 12v than it produce too much heat which can not be handled by heatsink ...


for first time use check the heatsink temprature after every 10-15 min that is it really heated too much..


just make and enjoy yourself thus icy winter.

Step 10: Control Temprature to Save Peltier

if u used two peltier and heat heat much enough so that warm wind can also be got after switching off peltier supply than astable multivibrator can be used to control switching power in peltier. ..
i also tested that i get warm breeze till 1 minute of switching off peltier. ..
genereally heatsink got heated with in 1 minute ...

so my method is to use multivibrator in circuit. input supply 5volt is given by power supply box and output is connected to a relay which control the on and off supply of peltier.

for 65sec on and 65sec off
R1= 200kohm
R2= 200ohm

if u using one peltier by which warm breeze comes only for few times than u must attach fan supply to the relay output.. becoz by this when fan is off then heatsink didnt face cold air and it gets hot .. when it got enough hot than again fan start and hot air comes out and heatsink temprature again goes down..this process works again and again..

more details to adjust multivibrator



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    16 Discussions

    Hisham alshaeer

    2 years ago

    great work, i am need ask you,you test peltier for long time? or what longest time test it ? and what max temperatures you get it ?

    and you say :i also tested that i get warm breeze till 1 minute of switching off peltier.

    genereally heatsink got heated with in 1 minute ...

    5 sec of heating enough every 2 min?????

    ykgarg007Chitlange Sahas

    Reply 4 years ago

    but it better than using electric wire heating method .. thats start producing heating after only 100w


    Reply 4 years ago

    it is less efficient compare to compress air COOLING system ... no where mention efficiency for heating ...


    Reply 2 years ago

    Hello ykgarg007, you sad that it is less efficient compare to compress air cooling system no where mention efficiency for heating, did it mean this tool can stole surrounding calor into system plus extra energy for electrical input ? if this really working it will be the best heater system :D


    3 years ago on Introduction

    I like it! I really liked it. But, Can you give me what are the temperatures you got at the end of your heat sink for a particular voltage and amps (either wattage)?? So that we can understand how efficient is this peltier element!!

    By the way, Why dont you reverse the whole logic of air flow.. Connect a circular heat sink into the pvc bend and use fan in reverse way so hot air comes out of fan. This make hot air not to touch colder side for quite a distance. This might make it more efficient as there is no connection of air medium between both sides.


    4 years ago on Introduction

    This idea is flawed from its conception: ThermoElectric Cooling devices, also known as Peltier Junctions, are meant for heat transfer, not heat production. At most you are extracting heat of the air to give it back to the air, and any actual heating occurring is 40W of residual heat from the device's operation, plus a few more coming from the power supply.

    Therefore, you would be far more efficient if you just used a lightbulb in a box as a heater.

    3 replies

    Reply 4 years ago

    you are right that it transfer heat. u should also mebtion that how much heat it will transfer which depends on current and voltages appltied on peltier. this system is on 3.3amps with 12volt supply. which produce difference of more than 50C.

    as you say it transfer the heat .. that same concept can be also applied there .. other side of peltier is frozen because thats side temprature is transfer to heatsink side by this heatsink get hot ..

    and the power supply hardly consume 5watts power as i measure in peltier on state.


    so this is a 40 watt heater (2.85 amps X 12 volts = 34.2 watts) and the power supply itself consumes an additional 5 watts just as a function of power conversion . This whole system then uses 39.2 watts


    I really like what you made here and would like to better understand how this works.

    regarding "the system is on 3.3amps with 12volt supply" and "

    this system uses 2.85amps at 12volts input supply."

    I notice that you have the Peltier connected to a 5 amp plug, so my question is about the amperage it draws. How is the amperage draw limited to 3/5 of the available 5? Is this a function of your temperature control circuit switching it off?

    would this work outside in cold weather?


    4 years ago

    Fix your spelling, grammar, and sentence structure before you post anything! Too much time is being wasted by having to decipher your idea vs. usable English.

    2 replies

    A bit harsh, I would assume that english is a second language. I do agree however that it would easier to read without the text speak "u" and "becoz" for example


    4 years ago

    Is it ok for all that ice to build up on the peltier device?

    2 replies

    Reply 4 years ago

    ya becoz peltier generate deltaT which is the temprature difference between hot and cold plate ..
    but also be aware that peltier have its operating range -25c to 85c


    Reply 4 years ago

    when hot plate if forcefully tried to cold than ice created