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  1. #1
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    Need help with basic System design .



    So i thought i would make an Air conditioner from scratch.

    The basic system is rectangle box , im using an old esky

    Ive put separated The rectangle into to halfs . one for evap and one for condenser .

    Ive made copper coils from 1/4 inch pipe . a few meters long .

    Im going to use an old freezer compressor to pump the gas around.

    The idea of the system is to make to water almost freeze then have a fan blowing out the cold air. The comp would be running as much as a fridge does.

    And for the condenser have water slowly flowing through it to take away the heat. A drip every 2 seconds coming out and room temp water coming in from a new bucket.

    My question is . Would i be able to use my gauges as a metering device to restrict the refrigerant until i figure out the perfect cap tube ?
    Just use the superheat of the evap and close of the gauges until its good?

    And i will also need an accumulator after the evap to help hold the charge when the system is not running ?

    Also how much gas should i use , i cant find any info in my books that lets me know how much gas i need for the size of the coils .

    Ive been working for 7 years , installing splits and vrv welding all day hasent really tought me these things



  2. #2
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    Re: Need help with basic System design .

    I used an old danfoss hand valve for fun projects, was a bit hit and miss, a needle valve would be better if you can find one rated for refrigerant.
    Mostly found in Oxfordshire, UK :)

  3. #3
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    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: Need help with basic System design .

    Also try and get some data on the compressor. Small ones often have a 'critical charge' which is the maximum refrigerant allowed in the compressor shell, this might give you a start point.
    Brian - Newton Abbot, Devon, UK
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  4. #4
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    Re: Need help with basic System design .

    instead of all that messing about- why not use a chest freezer as all the components are size correctly and charge is correct too- fill it with water - then it is already insulated- then mount an extract fan with a grille at the opposite side of the chest to draw cold air accross the pond of cold water-also u can dunc for beers too- just change the stat for a fridge type- cycles at 2-7 deg
    can u tell that i used to dismantle things as a kid!!! haha

    Quote Originally Posted by Simeonx1 View Post
    So i thought i would make an Air conditioner from scratch.

    The basic system is rectangle box , im using an old esky

    Ive put separated The rectangle into to halfs . one for evap and one for condenser .

    Ive made copper coils from 1/4 inch pipe . a few meters long .

    Im going to use an old freezer compressor to pump the gas around.

    The idea of the system is to make to water almost freeze then have a fan blowing out the cold air. The comp would be running as much as a fridge does.

    And for the condenser have water slowly flowing through it to take away the heat. A drip every 2 seconds coming out and room temp water coming in from a new bucket.

    My question is . Would i be able to use my gauges as a metering device to restrict the refrigerant until i figure out the perfect cap tube ?
    Just use the superheat of the evap and close of the gauges until its good?

    And i will also need an accumulator after the evap to help hold the charge when the system is not running ?

    Also how much gas should i use , i cant find any info in my books that lets me know how much gas i need for the size of the coils .

    Ive been working for 7 years , installing splits and vrv welding all day hasent really tought me these things
    Last edited by frank; 08-02-2012 at 07:37 PM.

  5. #5
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    Re: Need help with basic System design .

    Yeah i knew about the hand value thing . thought two hand vavles on my gauges would do . going to be hard to get purfect .
    I did think of the freezer part . But was thinking its to hard to get it water tight . and if you have it on its side the comp is on its side. Mybe i can change the comp to site on something different .
    Also i was hoping my system would get the water down to temp faster than the freezer does becuase its smaller with the same comp . So i can run it for 10mins and get enough cold water for 30min of use.

    Thanks for your help .

    edit .
    ooo a chest freezer yeah that would hold water good .
    Reason why i wouldnt use it. Its cheating and wouldnt be as fun to do just the fan part of things.

    Also i figured if the condenser was in the same room as the cool air blowing out , Then IT WOULD BE CRAP .
    Might aswell pitch a tent over a open fridge door .

    Any one who can make a homemade air con please post some pics :P
    Last edited by Simeonx1; 09-02-2012 at 07:59 AM.

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