VERY SMALL A/C...where to find?

I'm looking for a very small a/c I can put on a shelf in my closet. Needs to be electric, small, and the cheaper the better.
I only need to cool about 50 cubic feet.

I've seen some battery powered ones, but that's no good. I need to set it on a timer.

Where are you going to expel the hot air? And the condensation? You will need to vent both of those somewhere. A fan expelling your hot air is probably your only option for what you are working with.

Edit: Look on Craigslist. Put it in a near window and try to drop the overall ambient temperature of the room. An A/C in a closet probably won't work.

This is to cool a grow, or a micro grow?

I don`t know about very small a/c units, but if one existed I know it would propably be cooled by a 'thermoelectric heater'. They are whats used in 12v portable cold boxes etc...

Its a semiconductor plate that when power applied freezes one surface and fries the next. Heatsink, fan & thermal grease is what you would need with it.

'peltier tab' or 'thermoelectric heater', have a look on ebay. 12v @ various wattages available they aren`t too expensive

you will need to exhaust the hot air, BUt
http://www.westmarine.com/webapp/wcs/stores/servlet/ProductDisplay?productId=752457&catalogId=10001&langId=-1&storeId=11151&storeNum=50667&subdeptNum=50673&classNum=50674#.T-ctcbVrOYE

neosapien said:

Where are you going to expel the hot air? And the condensation? You will need to vent both of those somewhere. A fan expelling your hot air is probably your only option for what you are working with.

Edit: Look on Craigslist. Put it in a near window and try to drop the overall ambient temperature of the room. An A/C in a closet probably won't work.

Click to expand...

Damnit! I never thought of the hot air lol. That's what I get for being baked all the time.

Tenner said:

This is to cool a grow, or a micro grow?

I don`t know about very small a/c units, but if one existed I know it would propably be cooled by a 'thermoelectric heater'. They are whats used in 12v portable cold boxes etc...

Its a semiconductor plate that when power applied freezes one surface and fries the next. Heatsink, fan & thermal grease is what you would need with it.

'peltier tab' or 'thermoelectric heater', have a look on ebay. 12v @ various wattages available they aren`t too expensive

Click to expand...

Now THAT I'm gonna look up right now. And its such a small area, I could just attach another fan to it.

Dr.blakedowns said:

you will need to exhaust the hot air, BUt
http://www.westmarine.com/webapp/wcs/stores/servlet/ProductDisplay?productId=752457&catalogId=10001&langId=-1&storeId=11151&storeNum=50667&subdeptNum=50673&classNum=50674#.T-ctcbVrOYE

Click to expand...

LOL, There is nothing small or cheap about that behemoth. Looks like a smart car.

So would this peltier work? Or is it way too small?
I just attach a fan to the side of it, right? But I'm wondering how much that little thing will cool?
I have a large 6 inch 24v fan I can use.

KidneyStoner420 said:

So would this peltier work? Or is it way too small?
I just attach a fan to the side of it, right? But I'm wondering how much that little thing will cool?
I have a large 6 inch 24v fan I can use.

Click to expand...

To give you an idea, a 100 odd watt peltier can generate frost crystals on one end in 30 seconds, the other end will be frying. These things can take temperatures down to -50c on one end but will damage itself if you can`t cool the other end.

So you want a heatsink + fan combo on the heating side of the peltier tab. On the other side, you want a heatsink with very tall paralell fins on it. You can blow the air through the vents and into your enviroment. The larger the surface area of the heatsink, the cooler your air will be. Heatsink is crucial

Or if you had a cabinet you could cut a square of wood stick the heatsink fins in there and leave the heating side out the back of the cabinet.

Peltier tabs are like $15 for 150 watts.

Oh man this sounds interesting, but Im confused. so the one I posted is 250w, but how much area will it cool?

Can you show me a couple heatsinks I could use on eBay maybe?

Edit:
Will this work?
http://www.ebay.com/itm/12V-DC-Cooler-Master-CPU-Fan-50mm-x-50mm-x-10mm-w-heatsink-EFB0512HA-HeatSink-/260850560084?pt=US_CPU_Fans_Heatsinks&hash=item3cbbe7ac54

But will something only 50mmx50mm really cool off my 50 cubic ft area?

Peltier-effect chillers are hideously inefficient. they're OK for cars where 12v is essentially a byproduct of driving.

One of the problems with small ACs is that the efficiency does not scale. imo you are better off with a smallish dual-hose unit ... just operate it for shorter intervals andor on a 'stat. My opinion. cn

<edit> Those heat sinks are designed to cool something with blown air ... they are not chillers.

How ineffient are they? I mean, when i was a little kid i remeber my parents had a good size cooler that plugged into 12v for camping. We used to keep ice cream in there!
I wonder how many were in there?
What would I need for the peltier to cool 50 square feet

cannabineer said:

Peltier-effect chillers are hideously inefficient. they're OK for cars where 12v is essentially a byproduct of driving.

<edit> Those heat sinks are designed to cool something with blown air ... they are not chillers.

Click to expand...

I can`t argue about the efficency of one as I`ve never used them for that purpose. I did not mean he should use that heatsink for chilling. I ment he should use that heatsink, or a similar one to cool the hot side of the peltier.

KidneyStoner420 said:

How ineffient are they? I mean, when i was a little kid i remeber my parents had a good size cooler that plugged into 12v for camping. We used to keep ice cream in there!
I wonder how many were in there?
What would I need for the peltier to cool 50 square feet

Click to expand...

Those coolers use about 50W, but you can`t compare as they are insulated boxes with no airflow, while the grow room has a constant airflow in it. It would depend on the amount of air being carried out, the outside ambient temperature etc... You could only find out by experiment (unless you knew some hardcore physics)

Maybe if one pointed the largest possible heatsink, which uses heat tubes and a little square on the bottom, through the cabinet wall and had the peltier stay on the outside of the cabinet with its own individual fan. Then place a fan on the SIDE of the heatsink to blow air through the fins... Never experimented with airflows and how much peltiers cool that way so I can`t really advise you kidneystoner. Just some ideas.

By the way you never said anything about how many watts you were burning in there, what its walls were made out of, if your using a cooltube, if your using a carbon filter and finally what is your ambient temperature? What is it a cabinet, room or tent?

Tenner said:

By the way you never said anything about how many watts you were burning in there, what its walls were made out of, if your using a cooltube, if your using a carbon filter and finally what is your ambient temperature? What is it a cabinet, room or tent?

Click to expand...

I'm running a 250w with a homemade cooltube, 4"inline fan, and carbon scrubber. Walls are drywall and i CAN NOT modify them. The "room" is a sealed coat closet. 2'x3'x7'. the temp is anywere from 82-90*+

I usually keep the door open all day unless i leave before I can open it up. That 84* temp is with the door wide open. I saw 108* once when the door was shut all day

KidneyStoner420 said:

I'm running a 250w with a homemade cooltube, 4"inline fan, and carbon scrubber. Walls are drywall and i CAN NOT modify them. The "room" is a sealed coat closet. 2'x3'x7'. the temp is anywere from 82-90*+

I usually keep the door open all day unless i leave before I can open it up. That 84* temp is with the door wide open. I saw 108* once when the door was shut all day

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Hmm fair enough. Although I`d ask how you exhausted the cooltube and the inline fan out of the closet if you can`t make any holes in its walls?

An a/c pointing in there sounds like its best for your situation. You must have high room temp. Good luck

Yeah I just suck air through the scrubber, through the fan,through the tube and just out the other end of the tube. It definitely cools off the bulb. I can touch the glass right at the bulb and just hold my hand there. The trouble is there's nowhere to exhaust the air.

Are you REALLY gonna come in my threads again and start doing this shit? You need to be suspended from this forum.

KidneyStoner420 said:

Yeah I just suck air through the scrubber, through the fan,through the tube and just out the other end of the tube. It definitely cools off the bulb. I can touch the glass right at the bulb and just hold my hand there. The trouble is there's nowhere to exhaust the air.

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Lol @ the trolling... Don`t feed them kidneyman

So from what I understand you have a closet and you can`t modify the inside walls of it at all. Off limits.

What about the closet door? Made of some form of wood I`d imagine. What about finding any old door for the closet (you put one together, carpenter makes one, find one scrap) and depending on how similar it looks, you can either modify a vent on the old door (then later fit the new one) or just unscrew and fit the new door, make a vent on the bottom and when its all over screw the old door back in there. Nobody would notice I bet landlords have no fucking clue which colour door is fitted in which house

You could have a vent on the bottom hinge side of the closet door (so the vent pipe doesn`t get in your way), then keep a shirt in a hanger on the door handle for a little disguise

What you want isn't cheap.

http://www.amazon.com/Amvent-Ductless-Conditioner-Conditioning-Cooling/dp/B002LL69TW/ref=sr_1_6?ie=UTF8&qid=1340683899&sr=8-6&keywords=Split+mini+air

Tenner that's a great idea but I really can't modify the door either. I wish I could.

voidobject over in the dwc area bought some type of ac with no exhaust, how that works I have no idea but maybe you can get with him and get some details on that. The mini split still requires a few holes be poked in the walls. op says this is out of the question.