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Cregar 10-28-2006 01:28 AM

Fermentation Chiller
OK... starting my first DIY project for a fermentation chiller. I have found the plans online and seen some of the ones here on the site.

I decided to double the size of the plans I found online so I could hold 3 or 4 carboys.

I had a couple of questions... on the plans it says to cut 2 square area out of the piece between where the ice goes and where the carboys are, but it says to only use 1 fan. why is that?

Also, since cold air drops to the floor... wouldn't it be better to have the fans at the bottom of the chiller then at the top?

Would it work to have a fan on the bottom blowing air into the carboy chamber and one fan at the top, sucking air out... in effect, circulating the air?

Please... any advice or input would be appreciated.

BTW... here is a rough design so far.


Measurments are:
Width: 36"
Height: 33"
Depth: 41"

It will be made with Omega board that I can get from work and have 2" Polystyrene for insulation inside.

UPDATE: I might have to make the width a little smaller... just measured and it won't fit through my front door. :(

Chairman Cheyco 10-28-2006 01:42 AM

Well as to where the fan goes, it's a closed system so all you want to do is get the air circulating - this is what the other hole is for as well.

Can't you just build it where it's going to stay?

Cregar 10-28-2006 01:58 AM


Originally Posted by Chairman Cheyco

Can't you just build it where it's going to stay?

I live in aparment and will be moving next school year to get my daughter in a better school district. So, I need to be able to get it out... But now that I think about it, I could just take it part.

Beer Snob 10-28-2006 02:16 AM

Have you increased the area where you keep the ice? Just thinking that if you increase the area to be cooled the area that does the cooling would need to increase as well. No idea if this is what is needed... just seems logical to me.

Cregar 10-28-2006 02:20 AM

I pretty much just doubled the width of these plans. So I would think if they are correct with the cooling area for a single carboy it would work for a double carboy.

Beer Snob 10-28-2006 02:25 AM

Sounds right to me. You'll be able to put more cold stuff in there at any rate:)

Cregar 10-28-2006 06:11 AM

Just wish I understood the math for figuring out airflow/volume, so I knew what size fan to put in it.

FYI the carboy area has 11.64742 cubic feet of volume.

Vels 10-29-2006 10:23 AM


Originally Posted by Beer Snob
Have you increased the area where you keep the ice?

Am I the only one thinking of doing this with peltiers so you can both raise and lower temp depending on if youre doing lagers in summer or belgians in winter.


runhard 10-29-2006 01:11 PM

Hi Vels,
Check out dyerneedofbeer's peltier fermentation chiller. He might be a good resource to bounce some of your ideas off of since he has built a couple of these already. He might be able to help with the choice of peltier device.
Here is a link to his gallery.

Yuri_Rage 10-29-2006 02:30 PM

I was a bit leary of peltier devices, but apparently they really do work, and there are some success stories with them. I'd love to see one in action and witness the results. The concept is pretty cool (no pun intended).

The biggest drawback I can find is the price. A peltier device big enough for a carboy or two costs a lot more than insulating a box and using ice.

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