The various fields in the Volume Portion of the window are used for the following purposes:
- Kettle Volume
- Kettle Volume is the volume of liquid in the kettle before the boil has taken place.
- Wort Boil Duration
- This is the amount of time that you will be boiling your wort. This does not include time to heat your wort to boil, only the actual time that it will boil.
- Evaporation Loss
- Amount of wort volume lost due to evaporation during the boil period.
Evaporation Loss = (Evap/Hour / 100 ) * Wort Boil Duration * Kettle Volume
An example would be if you have 7% entered in the Evap/Hour field, and you boil 5 gallons of wort for 1.5 hours, then the volume of water lost will be .53 gallons.
Evaporation Loss = .53 = (7 / 100) * 1.5 * 5
- Water Volume Added
- Final Volume is the volume of wort after the boil has taken place.
- Efficiency
- Efficiency is most relevant for all grain and partial mash brewers. It indicates how efficiently sugars are extracted from your mash. This is best based on previous batch experience. If data is unavailable then home-brewers can expect efficiency between 70 and 80% whereas commercial brewers can attain efficiency as high as 90%. Starting with 75% is going to get you close you will adjust this number as you gain experience. When you take your OG reading the efficiency can be more accurately calculated using the Analysis Tab.
- Attenuation
- Attenuation field indicates the apparent attenuation expected from your yeast. Attenuation varies with yeast strain. There are several factors that affect attenuation including yeast strain, mash temp, ingredient choices, fermentation temp...etc.
So when creating a recipe you want to use your best guess. If you have already brewed and you know what you final gravity is you can enter your Original Gravity reading in the Analysis Tab. Doing this will automatically calculate your attenuation.
- Evap/Hour
- Percentage of wort evaporated off per hour.
Evap/Hour = (100 * Evaporation Loss) / (Wort Boil Duration * Kettle Volume)
An example would be If you have 1.01 gallons entered in the Evaporation Loss field, and you boil 6.74 gallons of wort for 1.5 hours, then the Evap/Hour will be
Evap/Hour = 10% = (100 * 1.01) / (1.5 * 6.74)
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