My Mini Fridge to Fermentation Chamber Build

[RyanSweeney]

Maybe this is a stupid question, but I'm gonna ask anyway. With your carboys being essentially at floor level, how do you get the beer into the secondary vessel without picking up the primary and elevating it on a table or something? Doesn't that disturb the junk at the bottom, and lead to some of that stuff getting into the secondary?

 

[chumpsteak]

I almost never secondary, but I do lift the carboys up on top of the work bench to keg the beer after primary. I keg my beers anywhere from 7 days to a few months in primary and I always get a little yeast and trub in my kegs. This is only an issue if you move your kegs around a lot. My kegs go in my 5 tap keezer and pretty much sit in the same place until they are empty. Any trub that makes it into the kegs will fall out of suspension and smash down on the bottom of the keg. You will always get a few cloudy pours at first but most of the beer will be crystal clear until the last glass which will normally contain some trub. To combat this and keep my beer lines clean I have bent all my dip tubes in my kegs over to the side of the keg and up a little so that I leave that last cloudy glass of gunk in the keg. When my kegs blow you get a little extra foam and that's all....no gunk in your glass or in your lines. I haven't cleaned my beer lines for 2 years.

 

[Xairell]

Thanks for posting your build! I will be attempting something similar here this fall. Nice to know it works well where we live. I'm getting a bit tired of tossing frozen water bottles into my swamp cooler a few times a day. It's been a hot one this year.

 

[chumpsteak]

Cool man, nice to hear from a local. Let me know if you have any questions as you work on your build. Best way to get started is to buy a mini fridge off craiglist and then dive right in. Make it up as you go and give yourself plenty of time. Good luck!

 

[number40fan]

Bump for a sweet build and to see how many more people will ask about lagering.

 

[Mountainsax]

Ok, I'll bite... Can you lager in it?😜

I'm getting ready to build one like this and want to be able to lager soon.

 

[govner1]

My guess is no. I have a backup ferm chamber made using a 4.3 cf GE mini-fridge. It holds 3 6 gal carboys and will hold below 50°F in the summer.
My larger chamber holds 6 6 gal carboys w/ about the same efficiency.
I invested in a (free) 7cf chest freezer for lager fermenting & have added (free) a 14 cf fridge for lagering and cold crashing.

 

[jayway]

Thanks to this thread I was able to build my own chamber and it's working great so far. It did turn out a little big but at least I can still park in the garage so I'm fine with it being a beast. I bet I could fit 6 carboys in it with room for a couple kegs to condition. Thanks for the inspiration chumpsteak!

 

[madcook]

I built a chamber with two stc controllers 1 mini fridge for the lager side and a fan drawing from lager side for the ale side but I'm having an issue with keeping the temps down on both sides any ideas guys

 

[chumpsteak]

The chamber looks awesome Jayway! Congrats on a cool build!

 

[chumpsteak]

I built a chamber with two stc controllers 1 mini fridge for the lager side and a fan drawing from lager side for the ale side but I'm having an issue with keeping the temps down on both sides any ideas guys

Not sure without seeing your design madcook, but maybe its an insulation thing. Also, did you put fans in the mini fridge to blow the cold air around?

 

[madcook]

View attachment ImageUploadedByHome Brew1418192309.525256.jpg so I put 1 1/2 insulation on the inside but other than a fan to move air from lager no I didn't

 

[cgraber]

This may have been covered already, if so, sorry in advance. Just my $.02 for those running their chambers in hot climates. Try putting a regular floor fan behind fridge to help remove excess heat. refrigerators are engineered to run with ambient air temps at 72 degrees, so when running above this temp refrigerant pressure is increased and this increases saturation temps thus reducing the cooling efects. The heat you are feeling is form the condenser coil and since it is in a hot environment it can not remove heat properly, causing compressor to run hotter and this will shorten the compressors life.

If I was in that situation, I would put a service valve on the suction line and decrease the pressure thus allowing the compressor to run cooler as well as lowering the overall temps that would be able to be achieved. If you know an a/c tech that is willing to throw their labor in for free and you just pay for parts and materials they can easily perform this for you. The materials needed would be about 10 bucks.

 

[edroberts]

I got the Love TSS2-2100 controller wired in and a couple more fans running now and the chamber seems to be doing very well. I have a bucket of water in there now and I'm able to keep it at a pretty constant 66 degrees with the compressor only kicking on a couple times an hour. It's 95 outside here today and at least 85 in my garage so I feel pretty good about how it's performing. Just need to figure out the best settings for the love to keep the compressor from running too much, but it's able to completely cool down between runnings, so it's probably ok right now. Will update with pics of how I mount the controller soon.

What R rating did you chose for your foam board to help hold temperatures in check for the summer?

 

[chumpsteak]

This may have been covered already, if so, sorry in advance. Just my $.02 for those running their chambers in hot climates. Try putting a regular floor fan behind fridge to help remove excess heat. refrigerators are engineered to run with ambient air temps at 72 degrees, so when running above this temp refrigerant pressure is increased and this increases saturation temps thus reducing the cooling efects. The heat you are feeling is form the condenser coil and since it is in a hot environment it can not remove heat properly, causing compressor to run hotter and this will shorten the compressors life.

The fan blowing on the compressor is a good idea. Mine certainly gets smokin hot in the summer when the fridge is running a lot. Have made it through 3 summers so far with no issues though, so not sure how hard it is on the compressor. I make sure to set the love controller to allow 15 minutes between cycles so hopefully the compressor cools down some in between.

 

[chumpsteak]

What R rating did you chose for your foam board to help hold temperatures in check for the summer?

I didn't pay attention to the R rating, I just got the thickest foam they had at Home Depot which was about 2 inch.

You can see in one of the first pictures I posted though that there is a stamp on some of the foam that appears to say R-10.

I think the key with the foam is to make sure all the seams are calked and taped to keep the chamber as airtight as possible. It's a big area for the fridge to cool and without all the seams sealed you'll be letting heat in faster than you are cooling. I think fans blowing across the top of the fridge or wherever the cooling coils are is also very important to both reduce condensation and blow the cool air around.