I'm back with air conditioning project.

This is a simple Homemade, portable, 12V DC air conditioning system.

So guys you can make one using the following steps.

Step 1: Parts Required

  1. Plywood
  2. Old radiator fan
  3. Old windshield washer pump
  4. 12V 4A power supply (you can use a computer SMPS also)
  5. Copper tube (5 mm diameter)
  6. Tube connectors
  7. Electrical components ( detailed in step 3 & 4)
  8. Soldering iron
  9. Driller

Step 2: Plywood Preparation

Cut the plywood in required length.

Length will depend upon the radiator fan.

After cutting put holes for attaching copper tubes.

Make holes for switch & LED too.

Cut copper tubes also.

Step 3: Make Circuit for Pump

Circuit 1

Why i used a circuit for pump ?

It is not required run the pump continuously. So i made a repeating timer circuit.

I made it for 1 min on & 1 min off . Refer this to get more idea.Repeat-Timer-Circuit.

Give connections as per the circuit diagram given.

Step 4: Make Speed Control Circuit for Fan

Circuit 2

Speed controlling is necessary for a fan, i made a simple pulse width modulator for speed controlling.

Components needed

IC NE555

Diode 1N5815

VR 100k


Capacitors 10nf, 0.1nf, 470mfd

Give connections as per the circuit diagram given.

Step 5: Assembling Plywood & Parts

Make a plywood box & attach switches, LED & speed controller.

Step 6: Fixing Fan & Giving Connections

According to connection layout give connection to fan, pump, circuit 1 & circuit 2.

Step 7: Fixing Copper Tubes

Now fix the copper tubes in previously drilled holes. Connect each copper tube using hose pipe from pump & finally to the collection tank.

Step 8: RUN A/C

Make sure all the connections are correct, Now pour a bottle of cold water to the collecting tank & turn on the pump & fan.

WooHooo your A/c Ready...

<p>I think there is something wrong with the circuit, replace pin 3 with 7. And add a diod (approximately 10 amp) across motor so that if motor spins after cut off, it acts like a generator and can produce enough electrical energy to fry mosfet.</p>
<p>Great and cost efficient. I love your ingenuity</p><p>However than using cold water , can't we do something that cools naturally.</p><p>Currently, You COOL the water using Fridge or Ice. all these require Additional power. Then you just circulate it around the fan which needs even more energy. As a result this system is terribly inefficient. Using a latent heat evaporative cooler would be much better option.</p>
<p>Thank you for your valuable comment. evaporative cooler is a good option but it will also need pump to circulate water.</p>
Yes a Pump is always required. I was wondering if it's possible to Cool water and Then the Room using ONE pump. You can make a pump work like Evaporative cooler, which cools water. then the Cool water can be circulated for room Cooling. <br> <br>Using Fridge for cooling water is total waste. <br> <br>What I mean to say is, Dual stage Evaporative cooler. Where the humidiy is not passed inside the Room (Like AC).
<p>You shouldn't just say MAKE something. Show how you make and give dimensions with instructions to make it more clear. As it is you aren't giving out enough info.</p>
<p>Different radiator fan have different dimensions that's why i didn't provided exact dimensions. It is not necessary to choose exact things what i used, you can make alterations with availability of parts. </p>
<p>? just use a temp censor, connected to a relay. through a auto wiper timer. then fuse it up with wiring. plus if u use a block of ice it migh last longer plus yuo'ill have cold water to drink after a well.</p>
<p>Its ok...but cost will be more.</p>

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