Well, here's the first of my projects - the 30L autofermenter.
The idea behind it is well known - by direct cooling a fermenter, brews such as lagers (which can tie up a fermentation chamber for months on end) can be brewed with their own with temperature control. There are some commercial products available, but the cost is prohibitive, so I've decided to make my own. Here's the kit:
Parts List :
240x190x90 mm Adaptable box
60W Tec-12 Peltier cooling kit
2x 8 pin 10A Relays
STC-1000 12v Unit
Din Rail terminals
12v PSU - 10A DC @ 12v
Alloy stock :
Flat bar - 50x12.5x150mm
Rod - 12.5mm Diameter
The peltier unit is rated at 60W and will be modified by removing the bottom heatsink and mounting the unit to the alloy bar - this will in turn have 3x 300mm 12.5mm alloy threaded into it to act as cooling spears into the liquid. The whole unit will be mounted into the lid of a 30L fermentation bucket. Insulation for the whole setup is courtesy of a modified 13.5 tog duvet wrapping trimmed to fit.
The relays will allow me to reverse the polarity of supply via the STC unit without the complexity or cost of an H-Bridge, so the unit can both cool and heat.
Total materials cost so far is running about £45.
Build thread to follow 😉
Beer is like porn - you can buy it easily enough, but its so much more fun to make it