Point of reflection – r Flashcards
(19 cards)
What is Darcy’s Law in relation to wort separation?
Darcy’s Law relates to pressure limit/DP, bed depth L, and filter cross-sectional area A being fixed for a given mash charge and wort separation device.
What two variables can change the flow rate during wort separation?
Grain bed permeability K or wort viscosity µ.
What affects grain bed permeability?
The coarseness of the grind.
What happens if the husk fraction is lower than normal?
Grain bed permeability will be lower and wort flow rate will reduce.
What is the consequence of not allowing wort flow to reduce?
The differential pressure (DP) will increase until the pressure limits of the device are reached.
What is a potential trade-off when creating a finer grist?
Better extract efficiency versus increased cycle time.
What can indicate a change in the husk fraction without any milling changes?
A change in malt friability.
How does wort viscosity affect flow rate?
Increased viscosity can slow down flow rate or create higher DP.
What is a main indicator of increased wort viscosity?
Higher levels of β-glucan in malt analysis.
What are the typical satisfactory values for β-glucan and viscosity in malt analysis?
β-glucan < 100 mg/L and viscosity < 1.5 cP.
What factors affect wort viscosity?
Wort gravity and temperature.
What is essential to check regarding sparge temperature?
Probe calibration and that the sparge temperature setpoint has not been reduced.
What can hinder wort separation during the mash conversion?
The presence of gelated glucans and proteins due to high shear forces.
What is the maximum agitator tip speed in the mash conversion vessel?
2.5 m/s.
What happens if the mash transfer pump speed exceeds 1,000 rpm?
It may cause gelation due to higher shear forces.
How does one extra deep bed rake affect brewhouse capacity?
It can reduce brewhouse capacity by 8%.
What is the cycle time for a lauter tun operating at 10 brews per day?
144 minutes.
What is the cycle time for a mash filter operating at 13 brews per day?
110 minutes.
Fill in the blank: A 10-minute increase in wort separation time can significantly affect _______.
brewhouse capacity.
