I plan to build an airlock with a CO2 trap in order to reabsorb the CO2 trapped during a cold crash. I have a clear idea how to do it.
My question is: how much CO2 will be reabsorbed by the beer after fermentation during this cold crash?
Let's assume we have 20 liters of beer in a 30 liter container. 10 liters of CO2 will be already trapped in the fermentation tank and the capacity of my CO2 trap could be limited to the remaining.
Also assume that the temperature during the cold crash starts at 22°C and ends at 5°C.
According to Palmer's book "How to Brew", the volume of residual CO2 is 0.77 at 22°C and 1.32 at 5°C. The difference of 0.55 vol means that the maximum possible absorption is 0.55 * 20 l = 11 liters.
Therefore, the capacity of my trap may be limited to 1 liter. However, if my fermentation tank is closer to 20 liters, it will be more.
This calculation is based on total reabsorption. But is such a total reabsorption credible knowing that nothing comes to inject the CO2 into the beer as is the case when it is oxygenated with a pump and a stone or using pressure?
My question is: how much CO2 will be reabsorbed by the beer after fermentation during this cold crash?
Let's assume we have 20 liters of beer in a 30 liter container. 10 liters of CO2 will be already trapped in the fermentation tank and the capacity of my CO2 trap could be limited to the remaining.
Also assume that the temperature during the cold crash starts at 22°C and ends at 5°C.
According to Palmer's book "How to Brew", the volume of residual CO2 is 0.77 at 22°C and 1.32 at 5°C. The difference of 0.55 vol means that the maximum possible absorption is 0.55 * 20 l = 11 liters.
Therefore, the capacity of my trap may be limited to 1 liter. However, if my fermentation tank is closer to 20 liters, it will be more.
This calculation is based on total reabsorption. But is such a total reabsorption credible knowing that nothing comes to inject the CO2 into the beer as is the case when it is oxygenated with a pump and a stone or using pressure?