Thought I'd share my results after tweaking my first two-stage setup.
I decided to eliminate the second chill water tank that relied on gravity flow from an elevated kettle (PITA to regulate flow), to a single chill vessel. I chilled from 210F to 45F with a flow rate of .8GPM with ground water @ 60F (could have got lower temp with slower flow). I even went WOT a couple of times to see how much the temp would raise and to my surprise, it still remained in the mid to upper 50's. I also noticed that the ice bath remained intact with plenty of ice left to knock the wort down to lager pitching temp! I'm sure it will be more challenging in the summer months when ground water is in the 70-80 degree range. Cheers!
Two-Stage Heat Exchange: You'll need two chillers & two pumps.(make sure second chiller is sanitized)
Stage-One: Pump wort from BK thru 1st Chiller using ground water 60F-80F. (this is your knock down stage)
Adjust flow rate. (slower flow rate equals maximum heat exchange)
Stage-Two: Setup a 15-20 gallon ice bath. I use my MT . (recirculate @ WOT),
Monitor temp and adjust flow rate for target temperature.
Option B: glycol chiller, second stage only!
_________________ Kal Clone (30amp),Mash Re-Circulation Manifold, Custom BK Hop Filter.
Last edited by Tennessee on Sun Dec 16, 2018 4:34 pm; edited 3 times in total
Link Posted: Fri Dec 14, 2018 9:44 pm Post subject:
dp Brewing Company wrote:
Is this something you plan on doing year round or just summer months?
I struggled for 30+ years to even come close to cooling my wort to lager pitching temps various methods. I finally came up with a full proof solution. I'll be using this method every time I brew a lager(year round). I already had an extra chiller so it was a no brainer to just hook the chillers in series, throw some ice in the MT and cool the boiling wort to the low 40ís if I so choose. Hint: if you want to recovery all the precious liquid in the hoses, chillers, pump, and, sight glass, just push a little CO2 thur the cold side just before your chiller. If your filling your fermenter from the bottom, just close the valve once the line is cleared. Cheers 🍻 _________________ Kal Clone (30amp),Mash Re-Circulation Manifold, Custom BK Hop Filter.
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