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- Nov 24, 2017
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So I am getting ready for my first real keg of beer. Just finally getting everything together for my Keezer. I plan to cold crash in my fermenter (it's a plastic Big Mouth Bubbler). So I don't suck back Star San or air, I plan to do the mylar balloon trick. I'll fill mine from a line off the CO2 regulator since I didn't have it connected during fermentation to fill if from the fermenter. Now in calculating the amount of CO2 I will need. It's surprisingly small if I am doing this right. I would think this is just an Ideal Gas Law calculation with pressure constant, so the volume change is inversely proportional to the temperature change (in degrees Rankine). I'm looking at about a 33 degree drop, so in Rankine I'm looking at about 495/528, so the head space volume would go down to about 94% of original. I'm looking at about 1 1/2 gal of head space, so we are only talking about losing about 0.1 gal. That easily fits in a single balloon.
Does this sound right. Somehow in my mind I was expecting a much larger volume collapse.
Thanks
Does this sound right. Somehow in my mind I was expecting a much larger volume collapse.
Thanks