tctenten said:
I am confused. What is the connection between ground water temps and ferm chamber temps?
No matter whether plate or immersion or counterflow, the rate of cooling decreases dramatically as the chilling wort approaches the groundwater temp flowing through the coils ...
You need the wort to be at pitching temp, to pitch, and if it's too far in either direction - it's bad news ...
Too hot, lots of esters, too cold, premature flocculation and the yeasties never setup shop and other organisms can get a foothold ...
Also, if the wort it too warm, you can't keep O2 in solution, and then it's not there for the yeasties orgy ...
The intensity of the boil -> hot break ...
The intensity of the cooling -> cold break ...
Without those, it's haze that's hard to clear at least, and more ...
The handling of the wort after the boil and until like 48-72 hrs after ferm has started is one of the key periods of time, and arguably
the key period of time ...
He's talking about 5 gallon batches, and if his groundwater is 80F, a chiller will bring his wort down to 100F pretty quickly, and then after 10-20 mins get down to 90F, and then after like a fucking hour get down to 85F, and basically get stuck ...
Now ... what to do? ...
If you pitch in that 85F wort, there can only be so much O2 for so long because it's too warm to hold much of it, and the yeasties are going to orgy like it's 1999 in there ...
Also, you are going to have yeast shock issues, because you have more than like a 5 degree diffential in temp of yeast/starter and wort ...
So, you can put the fermenter in the fermentation chamber to cool it down further, and then pitch when ready ...
You probably won't have created an excellent cold break, but hazy homebrew is A-OK - rustic, ever - and it works ... but it takes forever ...
It might be better with a real full-size refrigrator, but it sucks ass with a chest freezer ...
The little compressor and large air-space is meant to keep already frozen things frozen, more so than to freeze things that aren't frozen ...
It takes quite a long time to bring down a batch to pitching temp truth be told, and it would be longer and longer the larger the batch ...
So ... he, like me, is confronted with a need for a pre-chiller for his wort-chiller in all likelihood, and certainly in the Summer ...