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/diy/ - Do-It-Yourself - Homemade Air Conditioners

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Homemade Air Conditioners Anonymous 05/14/14(Wed)21:36 UTC+1 No.638372 Report

Does anyone on /diy/ have experience making homemade air conditioners?

I've recently moved into a place with no AC, and as the summer is here I want to build one. Possibly something based off one of these two designs:



Any tips would be appreciated. I just want something I can point at my bed while I sleep.
Anonymous 05/14/14(Wed)21:40 UTC+1 No.638375 Report

>air conditioning with ice and fans
that's dumb as hell.
Anonymous 05/14/14(Wed)21:46 UTC+1 No.638377 Report

Do you have a better idea?
Anonymous 05/14/14(Wed)21:53 UTC+1 No.638379 Report

Something like this?

Never made anything like it, but it might do the trick.
Anonymous 05/14/14(Wed)22:02 UTC+1 No.638383 Report

while these /diy/ options are certainly cheap and may even work for a room or two there's no way you're cooling down the whole house without buying a real one. just something to keep in mind.
Anonymous 05/14/14(Wed)22:08 UTC+1 No.638387 Report

you should try to modify a fridge. it may sound stupid, but they work the same way.
Anonymous 05/14/14(Wed)22:08 UTC+1 No.638389 Report


My only concern with the evaporative designs is that where I live is very humid, so it may not work as well.


I just want something to point in my direction when I'm at my desk or in bed. The place I'm staying in has 16 ft. ceilings, so I have no delusions of being able to cool the whole room.
Anonymous 05/14/14(Wed)22:10 UTC+1 No.638390 Report


That's definitely an interesting idea, my gf has a minifridge I don't think she wants.
Jesse 05/14/14(Wed)22:14 UTC+1 No.638393 Report

>Styrofoam cooler/bin
>water + ice
>submersible water pump
>box fan
>1/4 copper tubing

Take the copper tubing and bend it in a way to create a zig-zag to be put over the front of the box fan (the side where the air is being blown out). Attach it with some zip ties.

Fill up the styrofoam container with water and ice so it's very cold, then place the pump in it. Attach some flexible hose pieces to the ends of the copper tubing. Hook one end up to the pump, and the other just leave sitting in the water.

To use the AC, turn on both the fan and the pump. The pump will pull the cold water through the tubing and make it become very cold and condensate. The more powerful the pump, the better the circulation of cold water.

For the pump, 500 LPH (liter per hour) will do just fine. Too low of an LPH and it won't circulate the cold water. Too high and you're wasting your money. Ebay sells plenty of small aquarium pumps that.

Here's a 12w 160 GPH / 600 LPH water pump for $10.

You can pick up a 1/4" x 10' roll of copper tubing at Home Depot for $10

You can also pick up the foam cooler from Home Depot for $7-12, depending which size you get (12 qt vs. 22 qt). The larger the cooler the less often you have to replace the water, but the more room it will take up.
Anonymous 05/14/14(Wed)22:19 UTC+1 No.638395 Report


This is incredibly helpful, thank you.
Anonymous 05/14/14(Wed)22:44 UTC+1 No.638404 Report

I made one last summer and it works. It will cool a small room or a studio apartment a few degrees. I already had the fan and used a styrofoam cooler. If you're just looking to cool yourself off while sitting at the computer or on the coach then it's really effective.
Anonymous 05/14/14(Wed)22:50 UTC+1 No.638405 Report


Was it a pain moving it from place to place? Also, were leaks an issue?
Anonymous 05/14/14(Wed)23:25 UTC+1 No.638414 Report

>people who don't know a freezer produces heat
Anonymous 05/14/14(Wed)23:39 UTC+1 No.638420 Report

I think everyone here knows that. but it produces far more cooling. Be careful with your greentext retardation, that's like saying OPs pic won't work because the small fan would give off too much heat.
Anonymous 05/14/14(Wed)23:40 UTC+1 No.638421 Report

.... No. It does not produce far more cooling. It produces more heat than cooling. It just keeps all the cold stuff in one spot and the hot stuff is spread all over your house.

Anonymous 05/14/14(Wed)23:46 UTC+1 No.638423 Report

>but it produces far more cooling.
no, it produces more heat. this is why I greentexted it, you're totally ignorant.
Anonymous 05/15/14(Thu)00:01 UTC+1 No.638427 Report

>baw this, baw that, it don't worky! :[

Holy shit, you people. Cool yourselves, not the room. Use one of these units to direct a steady stream of cool air onto you. That's what they are for. Nothing else. It doesn't matter if the freezer creates more heat because you have a steady stream of cool air blowing on you.

Best part is, most of these systems can be portable. So you can take it out to the garage, attic, workshed, and use it to spot cool you while you work. That is why they are fucking awesome.

I made the box fan type with the cooler of ice and water and the copper spiral tubing attached to the fan. The only drawback was the massive amounts of condensation that poured forth from it. I live in a super humid place. A towel under it fixed that issue. Just wring out the towel once in a while.
Anonymous 05/15/14(Thu)01:51 UTC+1 No.638459 Report


You guys are also retarded. Yes, air conditioners of all types produce more heat than "cooling" because machine itself dissipates heat from using electricity in addition to what they remove from the air around it. But guess what - homes have these machines in tiny little insulated closets to isolate the heat production to that little closet alone. In the case of DIY air conditions, the goal is to confine the heat to inside the cooler. That's why they work. That's why all AC's work. You confine the heat produced and spread the cold air to wherever you want it.
Anonymous 05/15/14(Thu)02:36 UTC+1 No.638469 Report

None of this really matters for OPs question. Of course it produces heat. More so than cooling. That heat is spread out through the entire house/apartment. He has no AC and its obviously hot as shit for him to want to go through the effort to make something. The few degrees the freezer raises thing really isn't a factor. Besides, hes probably not sleeping in the kitchen.

OP doesn't want to cool the living quarters with this. He want to concentrate cold air right onto himself.

As an AC unit these things are completely retarded and useless. As something he can put at the foot of the bed, aimed at his taint to help him get to sleep its probably just right.
Anonymous 05/15/14(Thu)05:34 UTC+1 No.638522 Report

Not the same anon, but you should use a fan/blower with higher static pressure. Ordinary fans have difficulty forcing air through tiny spaces (e.g., a pipe). You can try using a motor from an old vacuum cleaner. The key is power. More power means more rapid and better cooling.
Anonymous 05/15/14(Thu)06:10 UTC+1 No.638538 Report

a freezer has a cool side and a warm side. of course the warm side is on the outside and the cool side is on the inside. if you place it in a window with the warm side out and seal it around the edges it should work. however, i dont know how powerful it would be
Anonymous 05/18/14(Sun)15:38 UTC+1 No.639889 Report

This. I have an old mini fridge from college, the kind with a tiny freezer in the top part. I've been trying to look up just for fun if there was a way to take it apart and use the parts that make the freezer cold into a diy a/c, can anyone find any info?
Anonymous 05/19/14(Mon)01:05 UTC+1 No.640085 Report

If I put a tray of ice in front of a fan and blow it towards myself, isn't the outcome the same as this?
Anonymous 05/19/14(Mon)01:24 UTC+1 No.640100 Report

>this guy hasn't ever seen a swamp cooler before.
>must be trolling
Anonymous 05/19/14(Mon)01:28 UTC+1 No.640102 Report

basically yes
Anonymous 05/19/14(Mon)01:36 UTC+1 No.640107 Report

I would try the method mentioned of using a fan and copper coils. but mix it with the idea of a kegerator. Just put as big a container as you can inside, fill it with water, then run some pipe and a pump to it. circulate the cold water through the copper pipes and blow the fan over it.
the fridge should try and keep the water cool for you. and if you do it right it shouldnt need to many modifications.
try looking at how keezers modify the lids by lifting them with wood and foam insulation so they can get the taps exposed with out killing the compressor.
Anonymous 05/19/14(Mon)01:37 UTC+1 No.640108 Report

OP, you might want to combine this with a dehumidifier. A dehumidifier will make your room more comfortable than blowing air.

A dry heat is comfortable. The humidity is what gets you.
Anonymous 05/19/14(Mon)01:42 UTC+1 No.640109 Report


"It’s not so much the heat, it’s the humidity that’ll kill you"
>john candy pls
Anonymous 05/19/14(Mon)02:05 UTC+1 No.640120 Report

So the air moves over the top of the bucket full of rock salt "aka cheap salt" and the moisture is very highly attracted to and captured by the top layer in the bucket. When enough moisture builds up gravity and probably capillary action help move the moisture lower in the bucket freeing up the top layer to absorb more moisture. As you go lower in the bucket the salt becomes more saturated and the very bottom is at a maximum concentration of water to salt. A liquid forms and gravity pulls that into the bottom bucket through the 1/8 inch holes you drilled. Eventually the salt in the top settles down and put and needs to be replenished but very slowly.

Anonymous 05/19/14(Mon)02:48 UTC+1 No.640133 Report

Nope, ACs. work by transferring heat from inside to outside by evaporation and condensation of refrigerant.
Anonymous 05/19/14(Mon)03:38 UTC+1 No.640150 Report


Still, the process of pumping the refrigerant generates heat, it's just minimal and ultimately resolved by the unit itself.
Anonymous 05/19/14(Mon)04:12 UTC+1 No.640161 Report

>how does I into thermodynamics?

>pumping the refrigerant generates heat, it's just minimal
100-200 degree F condenser coils... minimal
Anonymous 05/19/14(Mon)05:29 UTC+1 No.640186 Report

The coils need to get hot to work. That heat isn't being generated, it comes from the room being cooled. That's how a heat pump works.
Anonymous 05/19/14(Mon)05:44 UTC+1 No.640196 Report

>heat isn't being generated, it comes from the room being cooled

gasses don't heat up when you compress them?
you are clearly a physics major.

in during maxim trolling.
pic related its the level you are on.
Anonymous 05/19/14(Mon)05:56 UTC+1 No.640197 Report

gasses do heat up when compressed its when they are uncompressed they get cold
Anonymous 05/19/14(Mon)06:00 UTC+1 No.640200 Report

There is a difference between "heat" and "temperature", and you don't get it.
Anonymous 05/19/14(Mon)07:26 UTC+1 No.640234 Report

>typical home ac is 1300 watts.
sounds pretty hot to me. Usually the heat exchanger is located outside for pretty obvious reasons.
Anonymous 05/19/14(Mon)10:24 UTC+1 No.640254 Report

>google Heat transfer coefficient...
put in 1300 watts of electrical power get 4 times that in heat power out of it, for arguments sake 4:1
Anonymous 05/19/14(Mon)12:21 UTC+1 No.640268 Report

Whenever current flows through a resistance, heat results. This is inevitable. The heat can be measured in watts,abbreviated W, and represents electrical power. Power can be manifested in many other ways, such as in the form of mechanical motion, or radio waves, or visible light, or noise. In fact, there are dozens of different ways that power can be dissipated. But heat is always present, in addition to any other form of power in an electrical or electronic device. This is because no equipment is 100-percent efficient. Some power always goes to waste, and this waste is almost all in the form of heat.
Anonymous 05/19/14(Mon)14:01 UTC+1 No.640284 Report

I do hope you didn't get that number from the wattage -rating- of a typical window unit.

Regardless, the process of compressing the coolant does not add heat to it. It makes it hot, but it does not add heat to it. The heat was all absorbed on the cool side of the exchanger, and compressing the gas simply puts all of that heat in a smaller spot, raising the temperature.
Anonymous 05/19/14(Mon)14:07 UTC+1 No.640286 Report

motor will burn out....
Anonymous 05/19/14(Mon)14:23 UTC+1 No.640288 Report

What? No it's not. Some of the energy used to compress the gas is turned into heat. Then that heat is transferred to the outside which is cooler then compressed gases temperature.
Anonymous 05/19/14(Mon)16:58 UTC+1 No.640322 Report

Forget the fan in box method. The best cold air is achieved by using an aquarium pump to draw water through a container of ice water via copper tube. Then make a flat winding of tube behind a box fan that you circulate the ice cold water through, you get cold air and lots of it.
Anonymous 05/19/14(Mon)17:13 UTC+1 No.640327 Report

>>640286 this isnt the simpsons, if its a decent fridge it will work, i used a mini fridge and attached it to fans and a tent for camping, 110f outside and just under 78f inside, the coil will ice up after awhile and if you dont shut it down and de ice it the compressor can burn out, but it will just overheat and switch into protection mode before that happens,
Anonymous 05/20/14(Tue)05:23 UTC+1 No.640517 Report

>I haven't read the thread

What about the coolers where you run some pipes down 20 feet into the ground and run a water loop with a fan and a car rad? Some of the local bumpkins do that here in the south.
Anonymous 05/22/14(Thu)18:31 UTC+1 No.641711 Report

Those work really well, if they are designed efficiently of course. I've been wanting to make one for myself, just been lazy lately.
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