Extract Efficiency Flashcards
(14 cards)
What is the impact of grind coarseness on extract efficiency?
A finer grind increases the extract efficiency by making more starch granules available for conversion.
What are the plansifter coarse husk fractions for mash tun, lauter tun, and mash filter?
- Mash tun – 36%
- Lauter tun – 26%
- Mash filter – 5%
How is the available extract in malt determined?
Through a specified milling regime followed by a bench-scale mash under specified conditions.
What factors can cause mash filter extract efficiency to exceed 100%?
The brewhouse hammer mill can produce a finer grind than the laboratory mill.
What are the two common units of measurement for wort strength?
- Specific Gravity (SG)
- ˚Plato (% w/w sucrose)
How is Specific Gravity (SG) defined?
The ratio of the mass of a given volume of a solution at 20˚C compared to the mass of the same volume of water at 20˚C.
What is the formula to convert Specific Gravity (SG) to ‘gravity’?
Multiply SG by 1,000 and subtract 1,000.
If the SG is 1.062, what is the calculated ‘gravity’?
62 degrees saccharine.
What does ˚Plato measure?
The grams of extract in 100 g of solution (% w/w).
How can we determine the weight of extract in a volume of wort?
By multiplying the wort ˚Plato by its density.
What is the common rule of thumb relating gravity and ˚Plato?
Gravity divided by four is approximately equal to ˚Plato.
At gravity 40, what does the rule of thumb suggest for ˚Plato?
10, which is close to the actual value of 9.97.
At gravity 62, what does the rule of thumb suggest for ˚Plato?
15.5, while the actual value is 15.2.
Is the rule of thumb for converting gravity to ˚Plato accurate for calculating extract efficiency?
No, it is not accurate enough for calculating extract efficiency.
