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Old 10-29-2011, 06:03 AM   #11
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passeddown,

those were the figures I was looking for. Homebrewtalk is so huge, it is tricky to find stuff sometimes. thanks for posting them here.

jkarp,

holy boil, batman. if I can get half of that with 1.5 kW, I'll be stoked. I just finally drilled a hole in my pot for the heating element. The unibit I used was a POS, so I need to spend some time cleaning up the hole before I'm able to test the heating. Between the output valve, sight glass, and heating element, I'm going to need to find a good way of insulating the kettle with all the various pipes sticking out of it.

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Old 10-29-2011, 12:38 PM   #12
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Quote:
Originally Posted by BadWolfBrewing View Post
Between the output valve, sight glass, and heating element, I'm going to need to find a good way of insulating the kettle with all the various pipes sticking out of it.
You cut your holes, insulate, and then assemble. Simply use a box cutter to score the insulation around the holes.
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Old 10-29-2011, 01:44 PM   #13
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The numbers are very close to what I see. I run my 5500w element at 70% for a 1.5 gal/hr boil off. Running the numbers show I need about 65. Add in another 5 for loss through the sides of the keg and it seems more than reasonable to me.

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Old 10-31-2011, 05:46 PM   #14
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Update:

Tried 4 gallons without insulation. Got to 212 from 170 in about 45 min, which isn't the end of the world, but the boiling wasn't overwhelming. Went to home depot and got some insulation, hopefully that will put it over the edge.
That aluminum pot is quite the radiator. And I'm surprised how much noise the heating element made. The localized boiling on the surface of the element made quite the hiss

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Old 10-31-2011, 07:08 PM   #15
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Seems like an awful long time. 170 to 212 with 1.5KW in 45 minutes is like 40% efficiency.

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Old 11-01-2011, 02:18 PM   #16
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oops, it was 120 to 212, was thinking about something else.

Without insulation though, the aluminum makes a hell of a radiator. That is tonights project, and then the countertop brutus is almost finished

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Old 11-01-2011, 05:47 PM   #17
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Ahh, that makes much more sense (and in line with my early tests). I suspect you'll find insulation a nice boost - particularly with the vigor of the boil. Keeping the lid on while coming up to boil also reduces the time significantly.

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Old 11-04-2011, 07:17 PM   #18
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System is mostly done, but the kettle is still subpar. Even with insulation (2 layers of R3 self-adhesive duct insulation) a 4 gallon boil is whimpy with the lid off. With the lid on, the boil is crazy, though that doesn't help much. I think the straps look snappy though.

I will try insulating the bottom of the kettle (cork, possibly). But word to the wise, if possible use a 2 kW heater. I calculated 1.5 would be just barely enough, but that was assuming I was getting a full 1.5 kW out of it. I measured my outlet as a bit under 116V, which puts my actual power at 1.4 kW. Major bummer.

I'm moving to the Detroit area soon, hopefully the condo I'm renting has 20A service in the kitchen.

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