Calling Dr. Kelvin

[WarmGas]

So I have been wondering if I could drop a hook into the deep talent pool out there on a question regarding temperature. Specifically, I have been wondering when I cold crash how do I get the quickest result?

For example, if I want my fermenting vessel internal temp to be 35F (1-2C) and it is now 68F (20C), is it more efficient/faster to put it in the fridge or kegerator set way below my target temp, at -40F (fer example), or should I just have the fridge/kegerator set at my target temp of 35F?

Note: this is the first time I have ever, and I do mean EVER, used an emoji.

Thanks in advance for the help.

 

[RedlegEd]

I think it's pretty intuitive that it will cool faster in a colder environment, but what you gain in speed might be lost in having to babysit/monitor the FV's temp so it doesn't get too cold. When I cold crash, I set the STC1000+ in my fermenting chamber (chest freezer) to my desired temp. It might take a bit longer to get there, but I don't have to worry about overshooting and getting too cold. Once it reaches the goal, I fine with gelatin and let it sit cold for a few days before racking to a keg.

 

[porterpounder]

Crashing as quickly as possible is not always a good thing. Some yeasts will stress out and throw increased esters as a result of quick cooling as well as enzymes that break down head-forming proteins. Some of the pro resources say no more than a drop of 4 F per day to avoid issues.

 

[zachattack]

I use a controller with a temperature probe when I cold crash or lager. I would think that's the easiest and fastest way to do it, the fridge temp becomes irrelevant and the compressor won't shut off until the beer is at your target temp.