My own DIY fan Chiller

Discussion in 'Beginner Discussions' started by CW, 24 Jan 2011.

  1. CW

    CW

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    Hi there ppl

    I got an idee today when i had a temp problem.
    I switched on the roof fan but dident help. Then i got the normal portable fan, placed it on the wall at the back of the tank and directed the fan to blow air between the light unit and my open canopy.

    And whala, my temp went down to 26.
    So it looked like it worked.

    Now i made another plan. Cos im not letting that stupid portable fan stand there all the time.
    And i definately dont have cash for a proper chiller.

    So i made my own.
    Using the following:

    Some flatbar and angle iron i had in my garage.
    8x 120mm, 12v pc fans, 38CFM, R45 each
    1x 400w pc power supply R250
    1x power supply switch (this will alow me to turn the unit on or of)

    Later on i might try using some kind of thermostat that will switch the unit on at 26 and of at 25. Something like that.

    And the i will also get beter quality 120mm fans which will give me 50 000 hours, 19db and 90CFM. So ill get more airflow wich sould work beter.

    But for now im just tryin this out to see if its realy gona work.

    So, less jara jara and more pics pics. hehe
    [​IMG]
    [​IMG][​IMG][​IMG][​IMG]
    So as you can all see.
    Im not done yet.

    Only had 4x120mm fans. Geting more tomorow.
    Still have a few holes to drill, need to paint the frame. (will powdercote it later.
    Have to build a controle box to hide the power supply in and and and.

    But as soon as thats done ill post more pics.

    Let me know what you think ppl.

    Yes i know, i am biz with a 120L top up tank aswell.
    Will probably build it tomorow.

    Cya ppl:thumbup:
     
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  3. KeeganP

    KeeganP

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    :yeahdude: looks good man.
     
  4. Keanan

    Keanan 2time

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    Yeah nice work.:thumbup:
     
  5. mariusmeyer

    mariusmeyer

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    Just one thing, the areas where the flatbar is in front of the fans will cause the air to bounce back into the propeller causing some noise. It might not be much but it will be quieter if you dont have it.
     
  6. Sentari

    Sentari

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    also watch for salt creep. also make 100% sure your wires arent exposed. I've almost had a fire with water / salt and electricity. They dont go together!
     
  7. RiaanP

    RiaanP Moderator

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    On the feet, I would put two inner extensions, to sit on both sides just inside the frame. Will prevent the unit from bliksem (tumble) into the tank.
     
  8. maxisoft

    maxisoft

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    Looks good. I had the the same problem yesterday with the heat. Dying to try this method of yours...
     
  9. chas84

    chas84

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    Have you explored the idea of using an aquarium heater's thermostat? I'd think that if you were to remove the element and connect the PC fans (seal it up properly again :p), then place the "heater" in the overflow chamber or in the sump. Not sure if it will work, but it switches itself on and off as the temp fluctuates.
     
  10. RiaanP

    RiaanP Moderator

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    nope, normal heater thermostat is designed to close the circuit when temp drops to allow the heater part to switch on, and to open when above set point, to break the circuit.

    The thermostat will open up when above a certain temp, and then the circuit is broken. That is when you want the fans to run, but the switch is then off.
     
  11. chas84

    chas84

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    Aha... Makes sense.
     
  12. mariusmeyer

    mariusmeyer

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    I tried modifying a heater but with the way that the switch is designed you can not reverse the switch.
     
  13. Sentari

    Sentari

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    You should be able to reverse the switch using a relay?
     
  14. CW

    CW Thread Starter

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    Holy crap. Thanx ppl.
    I dident think id had this mutch replies this morning.

    Ill reply to you all a bit later.
    Have to work right now.

    RiaaP. Im gona screw the unit to my wooden canopy top.
    It wont fall into the tank.

    Thanx to all for advice.

    Cw out:thumbup:
     
  15. dallasg

    dallasg Moderator MASA Contributor

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    hi...

    a couple of points, remember this is evaporative cooling, make sure you have RO water in your auto-top up, then again, make sure you have an auto topup.
    also you can reverse the thermostat or you can just get one that works the right way. look at www.rsonline.co.za
     
  16. RiaanP

    RiaanP Moderator

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    The last heater I tried to took apart, the glass just broke into pieces. That rubber top gets pressed into there like you cannot believe. Almost impossible to get it out. So if you do try to take a heater/thermostat apart, be careful. The glass tube is not that strong or thick.
     
  17. lIghty

    lIghty

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    Using a thermostat out of a heat is not advisable, Those things are so unstable when new, never mind over been fiddled with, rather build yourself an electronic unit, very simple and cheep, wouldn't cost you more than about R30.
     
    Last edited: 25 Jan 2011
  18. maxisoft

    maxisoft

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    where does one buy these fans and power supplies at a reasonable price?
     
  19. dallasg

    dallasg Moderator MASA Contributor

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    can get them at any pc shop or electronics store
    normal 12v pc cooling fans
     
  20. zayd

    zayd

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    awesome

    I need to look at something like this.
     
  21. Redhawk10

    Redhawk10

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    looking good, I build 1 about a 1 and half ago still going strong,
    [​IMG]
     
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