Ss Brewing Technologies Giveaway!

Home Brew Forums > Home Brewing Beer > DIY Projects > Electric Cold Box

Reply
 
LinkBack Thread Tools
Old 10-28-2009, 11:50 AM   #1
Punx Clever
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2007
Posts: 208
Liked 37 Times on 24 Posts
Likes Given: 7

Default Electric Cold Box

So, senior design for me in ME here at purdue rolled around this semester, and I managed to get a group together to build an "electric cold box." Some of you may be familiar with the cold plates sold so you can just take a coooler, put the plate and some taps on it, fill it with ice, and tailgate with your kegs. Not-so-cold beer goes into the plate, is cooled by the ice, and comes out the tap.

We decided that we would make one that required no ice. First plan focused on using peltiers, but they just didn't have the capacity to do the job... So we cannabalized a 5000 btu/hr window AC unit.

I tried to push for a bigger one, but costs were a concern.

Now, we have a device that will take 5 gallons of water from room temperature down to freezing in 40-45 mins. We are trying to take "beverage" from about room temp down to drinking temp with a 30s/pint pull time.

Pictures are forthcoming as is a detailed instruction on how to build one, and I'll be sure to keep this updated as to whether it works (I think we needed a more powerful unit myself).

Punx Clever is offline
 
Reply With Quote Quick reply to this message
Old 10-28-2009, 01:07 PM   #2
JKoravos
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2009
Location: Chelmsford, MA
Posts: 964
Liked 18 Times on 14 Posts
Likes Given: 3

Default

From an enthalpy standpoint, chilling 16 oz. from 20°C to 0°C in 30s requires a heat flow rate of ~1.25 btu/s, which is equivalent to ~4500 btu/hr. You're essentially going to have to have 100% heat transfer efficiency to achieve your goal. I'm not sure that it's even possible without some serious modifications to the AC unit. Of course, everything is possible if you have enough time and money.

__________________
JKoravos is offline
 
Reply With Quote Quick reply to this message
Old 04-10-2013, 03:24 PM   #3
beercity23
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2013
Posts: 53
Liked 3 Times on 1 Posts
Likes Given: 11

Default

BOILER UP! Love the ingenuity of Boilermaker engineers. I am a boiler, just not an engineer.

__________________
beercity23 is offline
 
Reply With Quote Quick reply to this message
Old 04-12-2013, 09:06 PM   #4
Punx Clever
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2007
Posts: 208
Liked 37 Times on 24 Posts
Likes Given: 7

Default

WOW! Blast from the past...

As it turns out, we "won" the senior design contest with our box... here's the basics of the guts:

We later built a nice wooden cabinet to house it in.

It took root-beer from room temp down to ~40F or so as it was being poured... so it worked. I wouldn't reccommend it though... having the compressor kick on every time you pulled a pint was annoying.

Punx Clever is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Swamp Cooler: How cold is too cold? simps984 General Techniques 20 05-11-2011 11:15 PM
Whoa Nellie - cold wort, cold water...what to do? kcpup Beginners Beer Brewing Forum 6 12-01-2009 12:09 PM
Cold crashing/cold aging Big10Seaner Bottling/Kegging 4 08-05-2009 07:32 PM
Cold Dead Hands - Electric Brew rig in action conpewter DIY Projects 21 07-08-2009 06:53 PM
How cold can you lager/cold condition? Alemental General Techniques 3 02-11-2008 07:28 PM