NSMikeD
Well-Known Member
How many psi would you need to put onto the fermonster with like 1 gallon of headspace in order to have no negative pressure inside of it for a 70F to 35F chill?
You wouldn’t be putting psi in but rather volumes of CO2 in. If you are using a regulator that controls psi then would need to know the equivalent psi at 35* so the regulator would add the correct volume. This method would automatically adjust the volume. Otherwise you would need to determine the volume and put the CO2 canister on a scale.
At 70 air pressure is 14.7 psi at sea level
From a tire pressure chart I found:
At 32* the equivalent of 10psi @68* is 8.3 and 20 psi is 17.6
the halfway point is 12.8psi. That would give you a rough estimate without going nuts using PV = nRT
If you can’t can’t add volume since it would just escape.