I recently built a beer fermentation chamber using a Peltier (TEC) plate for cooling. I built the chamber out of 1-1/2" Styrofoam insulation and a lot of duct tape. I salvaged a couple old Intel heat sinks and fans for either side of the TEC. They are mounted to a cheap cutting board that I cut a square hole in. It's all controlled with BrewPi , which is a RaspberryPi + Arduino project that is typically used for controlling chambers made from modified refrigerators. I made a quick a dirty Arduino shield to easily connect the DC relay and temperature probes.
I wouldn't call it a huge success because it's only barely able to maintain a delta of 10F (5.56C) when cooling. Thankfully that's enough for the batch I currently have fermenting in it.
Some things I learned:
1) Building an efficient thermal chamber is hard. Buying an old/used fridge sounds way easier.
2) The 92W Peltier (TEC-12706) I bought is not powerful enough.
3) Cutting sheets of Styrofoam in a uniform manner is a pain. I probably should have used nichrome wire and some kind of jig.
The end result of this project is that I came up with an even better idea for a more efficient way of cooling a fermenter. Stay tuned for that build.
 http://www.brewpi.com/#HomeBrewing #BrewPi