Building a Recipe¶
This tutorial is going to show you how to build a recipe using the objects provided by the BrewDay library. This will walk you through putting together each object, describe them and some methods, and then finally build a complete recipe.
The Grain Bill¶
To build a beer recipe you will want to first describe the grains to be used.
This is done by describing each grain with a brew.grains.Grain object.
from brew.grains import Grain
pale = Grain('Pale Malt (2 Row) US',
color=1.8,
ppg=37)
This object is really only descriptive. It tells you the characteristics of
the Grain that you will later add to your beer. What you want to construct
is a brew.grains.GrainAddition object, which describes how
much of the grain is added to the recipe:
from brew.grains import GrainAddition
pale_add = GrainAddition(pale, weight=13.96)
This object now decribes what will be added to the beer. You can further customize the grain by describing the type of grain being added:
from brew.constants import GRAIN_TYPE_LME
from brew.grains import GrainAddition
pale_add = GrainAddition(pale, weight=13.96, grain_type=GRAIN_TYPE_LME)
By describing the type of grain you change how it is utilized in the recipe equations.
The Hops Bill¶
The next piece to describe is the brew.hops.Hop object.
from brew.hops import Hop
centennial = Hop('Centennial',
percent_alpha_acids=0.14)
Again, this object is really only descriptive. It tells you the characteristics
of the Hop that you will later add to your beer. What you want to construct
is a brew.hops.HopAddition object, which describes how many hops
are added to the recipe and how long they are boiled for.
from brew.hops import HopAddition
centennial_add = HopAddition(centennial,
weight=0.57,
boil_time=60.0)
This object now decribes what will be added to the beer. You can further customize the hop by describing the type of hop being added:
from brew.constants import HOP_TYPE_WHOLE
from brew.hops import HopAddition
centennial_add = HopAddition(centennial,
weight=0.57,
boil_time=60.0,
hop_type=HOP_TYPE_WHOLE)
By describing the type of hop you change how it is utilized in the recipe equations.
Yeast¶
Yeast describes how much alcohol is expected to be produced by the recipe. This
is done with a brew.yeasts.Yeast object.
from brew.yeasts import Yeast
yeast = Yeast('Wyeast 1056',
percent_attenuation=0.70)
By changing the percentage of attenuation you can estimate different final ABV amounts for the recipe. By default the yeast expects 75% attenuation.
Building the Recipe¶
Let’s take what we’ve learned so far and prepare a Pale Ale recipe:
from brew.grains import Grain
from brew.grains import GrainAddition
from brew.hops import Hop
from brew.hops import HopAddition
from brew.yeasts import Yeast
# Define Grains
pale = Grain('Pale Malt (2 Row) US',
color=1.8,
ppg=37)
pale_add = GrainAddition(pale,
weight=13.96)
crystal = Grain('Caramel/Crystal Malt - 20L',
color=20.0,
ppg=35)
crystal_add = GrainAddition(crystal,
weight=0.78)
grain_additions = [pale_add, crystal_add]
# Define Hops
centennial = Hop('Centennial',
percent_alpha_acids=0.14)
centennial_add = HopAddition(centennial,
weight=0.57,
boil_time=60.0)
cascade = Hop('Cascade (US)',
percent_alpha_acids=0.07)
cascade_add = HopAddition(cascade,
weight=0.76,
boil_time=5.0)
hop_additions = [centennial_add, cascade_add]
# Define Yeast
yeast = Yeast('Wyeast 1056')
Now we want to put them together into a brew.recipes.Recipe.
from brew.recipes import Recipe
beer = Recipe('Pale Ale',
grain_additions=grain_additions,
hop_additions=hop_additions,
yeast=yeast,
brew_house_yield=0.70,
start_volume=7.0,
final_volume=5.0)
In any recipe you will want to define a few more pieces about the brew that will be done. The first is the Brew House Yield, or how efficient your system is. Typically this is set at 70% efficiency but can be anywhere from 60%-80% for a typical homebrewer.
You also need to describe the start and ending volume of your system. Here the recipe expects to start at 7 Gallons and end at 5 Gallons. The units are expected to be in Imperial Units unless otherwise specified.
Now you’ll want to see what this recipe produces. Just format the recipe to see what you’ve constructed!
print(beer.format())
Produces the output:
Pale Ale
===================================
Brew House Yield: 70.0%
Start Volume: 7.0
Final Volume: 5.0
Boil Gravity: 1.054
Original Gravity: 1.076
Final Gravity: 1.019
ABV / ABW Standard: 7.49% / 5.95%
ABV / ABW Alt: 7.98% / 6.33%
IBU: 33.0 ibu
BU/GU: 0.6
Morey (SRM/EBC): 6.3 degL / 12.4
Daniels (SRM/EBC): N/A degL / N/A
Mosher (SRM/EBC): 7.1 degL / 14.1
Grains
===================================
Pale Malt (2 Row) US Addition
-----------------------------------
Grain Type: cereal
Weight: 13.96 lbs
Percent Malt Bill: 95.0%
Working Yield: 56.0%
SRM/EBC: 4.5 degL / 8.9
Caramel/Crystal Malt - 20L Addition
-----------------------------------
Grain Type: cereal
Weight: 0.78 lbs
Percent Malt Bill: 5.0%
Working Yield: 53.0%
SRM/EBC: 3.3 degL / 6.4
Hops
===================================
Centennial Addition
-----------------------------------
Hop Type: pellet
AA %: 14.0%
Weight: 0.57 oz
Boil Time: 60.0 min
IBUs: 29.2
Utilization: 24.0%
Cascade (US) Addition
-----------------------------------
Hop Type: pellet
AA %: 7.0%
Weight: 0.76 oz
Boil Time: 5.0 min
IBUs: 3.9
Utilization: 5.0%
Yeast
===================================
Wyeast 1056 Yeast
-----------------------------------
Attenuation: 75.0%
Congratulations, you’ve now constructed your first recipe.