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Old 07-27-2010, 04:11 PM   #101
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The probe is dangling between the two carboys and waterproofed with two feet of heat-shrink PVC from:

http://www.etcsupply.com/thermal-wel...ube-p-150.html

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Old 07-27-2010, 04:13 PM   #102
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Glad to see the continued interest in the thread. I have to say though that I've moved on. As much fun as its been messing with this project someone finally gave me an old deep freeze so that what I'm using for my fermonator. It is 100x easier too. So for all of you that don't have the extra money to spend on another appliance, or don't have the space, this is a great solution. But if you have both get a freezer and stop swapping out water bottles every few days.

Lilrascal you can waterproof the probe with a piece of silicone tubing found at aquarium supply places.

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Old 07-27-2010, 05:21 PM   #103
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Quote:
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Lilrascal you can waterproof the probe with a piece of silicone tubing found at aquarium supply places.
What do you use to seal the end of the tubing?
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Old 08-24-2010, 04:51 PM   #104
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This is a very interesting idea.
I have read this thread like 2 times now.
Noticed that everyone seems to be using a igloo or home depot cooler for the carboy.
I can understand the insulation part of it, But has anyone tried just a tub filled up with water to see how well it works? I do 10g batch's and sometimes have 4 carboys full....4 coolers at 25 bucks a shot...Not a good investment.
Dont really want to buy a fridge..Already have 3..

Right now i am fermenting a kind of hacky sack water bath...but its a tub that only 6 inch's high. I put water bottles in it, Morning. Noon, Night and i can keep it around 70 thru main fermentation.. Not best but better than 80. So in theory it might work?

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Old 08-24-2010, 05:01 PM   #105
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I use 2 rubbermaid storage box stacked one in the other:

http://www.canadiantire.ca/AST/brows....jsp?locale=en


I put insulating foam, the kind you spray from a can, between the two to get improved insulation.

I can fit two carboys. They are submerged 3/4 in the water which I feel is good enough.

Only thing remaining is to make a custom cover.

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Old 08-25-2010, 04:18 PM   #106
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smashed, Are your useing the pump and ice bath setup?
If so, How much ice are you going thru in a day?
How cold are your fermenting?

Thanks

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Old 08-25-2010, 04:27 PM   #107
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Yes, a pump sitting in a ice bath with rubbermaid tubs for the carboys. See last page for pics. I have since slightly improved the insulation using foam on the rubbermaids and I drilled holes in the cooler for the tubing so I can now close the lid.

I ferment at various temps. Obviously the colder you go, the more ice you need.

I make ice blocks of roughly 2 cups volume. I need to add 5-6 of these twice a day to keep it 20F below ambient, on average.

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Old 08-29-2010, 04:51 PM   #108
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Looking at pumps for this project,
Whats the gph that works best for this project?
I am finding 40 - 130 gph depending on the pump for all around 20 bucks.

Slowly starting to get this project on the move.

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Old 08-29-2010, 06:34 PM   #109
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I use the HF 258 GPH. It's overkill for this application but is just enough in this one.

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Old 08-30-2010, 02:43 PM   #110
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Quote:
Originally Posted by winstonofbeer View Post
Looking at pumps for this project,
Whats the gph that works best for this project?
I am finding 40 - 130 gph depending on the pump for all around 20 bucks.

Slowly starting to get this project on the move.
Quote:
Originally Posted by 944play View Post
I use the HF 258 GPH. It's overkill for this application but is just enough in this one.
I will suggest as small a pump as you can find that will move the water. Two reasons:

1) The pump itself creates heat. That 258GPH uses 20Watts which all gets turned into heat. That is ~ 68 BTUs. If the pump runs 50% of the time (I don't know what's typical with these systems), that's 68 BTU x 12 hrs/day = 816 BTUs. A pound of ice absorbs ~ 144 BTUs melting, so 816/144 = 5.6#, so that's almost 3 Quarts ice melted by the pump each day. Almost six quarts/day if it running full time to initially bring temps down, less if the pump runs much less though.

2) I'd guess there's only ~ 3 gallons chill water in the cooler with the fermentor? So a +200GPH pump will replace that water in less than one minute. OK, some blending of the water, but in only a couple minutes the water near the fermentor has mostly been replaced with the cold water from the ice cooler. But it will take longer than that for the fermentor to actually change temperature. In the mean time, you are just running the pump for no reason - the water is not getting any colder.

A 5W pump will push maybe 30GPH through the hose, .5 G/minute, so it would take 6 minutes to do one changeover (which will have a blend of water in reality). This gives time for the fermentor/thermostat to react, yet it would seem to provide plenty of cold water in that time.

So a small pump will generate less heat, and might even give more stable temperature by slowly cooling the water bath, giving time for the thermostat to respond.

Check out some of these:

http://www.jebao.com/english/product...2&laywer1=4774

Watch the 'max head' - .5 Meters in some cases, you need to keep the max lift of the water to less than 'max head'.

-kenc
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