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).