Right now, I cool my wort with a plate chiller fed with ice water from a 70qt cooler. I have to add water and ice to the cooler while the submersible pump is running.
I have been considering replacing the cooler with a plastic barrel. I can get 55 gallon plastic barrels fairly cheap, and cut one down to about 30 gallons, which would be perfect.
Now, I'm thinking of replacing the ice. I use three or four bags of ice per 10 gallon batch. More in the summer, when the hose water gets up to about 80*F.
If I picked up a little dorm fridge cheap off CL (school will be out soon, and those will be going for nearly nothing), and pulled the refrigeration unit out, would it be enough to get 30 gallons of tap water down to nearly freezing overnight?