brew.utilities.yeast¶
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class
brew.utilities.yeast.
YeastModel
(method, units=u'imperial')¶ -
METHOD_TO_GROWTH_ADJ
= {u'shaking': 0.0, u'stir plate': 0.0, u'no agitation': 0.0}¶
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get_growth_rate
(inoculation_rate)¶
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get_inoculation_rate
(growth_rate)¶
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get_resulting_pitch_rate
(starter_cell_count, original_gravity=1.036, final_volume=5.0)¶
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get_starter_volume
(available_cells, starter_volume=0.5283443537159779, original_gravity=1.036)¶ Calculate the number of cells given a stater volume and gravity
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get_viability
(days_since_manufacture)¶ Yeast viability drops 21% each month or 0.7% per day from the date of manufacture. Assume linear change.
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get_yeast_pitch_rate
(original_gravity=1.05, final_volume=5.0, target_pitch_rate=1.42, yeast_type=u'liquid', cells_per_pack=100, num_packs=1, days_since_manufacture=30)¶ Determine yeast pitch rate
original_gravity - specific gravity of original beer final_volume - volume of the batch post fermentation target_pitch_rate - million cells / (ml * degP) yeast_type - liquid, dry cells_per_pack - Billions of cells num_packs - how many in units days_since_manufacture - the older the yeast the less viable units - imperial, metric
Yeast Viability: lose 20% viability / month or 0.66% / day
Imperial: B / Gal / GU Metric: M / ml / Plato
Sources: - http://beersmith.com/blog/2011/01/10/yeast-starters-for-home-brewing-beer-part-2/
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set_units
(units)¶
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class
brew.utilities.yeast.
KaiserYeastModel
(method=u'stir plate', units=u'imperial')¶ Kaiser Yeast Model
Only works for Stir Plage Growth
Sources:
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METHOD_TO_GROWTH_ADJ
= {u'stir plate': 0.0}¶
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get_growth_rate
(initial_cells)¶ initial_cells - Billion / gram extract (B/g)
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get_inoculation_rate
(growth_rate)¶
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get_resulting_pitch_rate
(starter_cell_count, original_gravity=1.036, final_volume=5.0)¶
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get_starter_volume
(available_cells, starter_volume=0.5283443537159779, original_gravity=1.036)¶ Calculate the number of cells given a stater volume and gravity
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get_viability
(days_since_manufacture)¶ Yeast viability drops 21% each month or 0.7% per day from the date of manufacture. Assume linear change.
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get_yeast_pitch_rate
(original_gravity=1.05, final_volume=5.0, target_pitch_rate=1.42, yeast_type=u'liquid', cells_per_pack=100, num_packs=1, days_since_manufacture=30)¶ Determine yeast pitch rate
original_gravity - specific gravity of original beer final_volume - volume of the batch post fermentation target_pitch_rate - million cells / (ml * degP) yeast_type - liquid, dry cells_per_pack - Billions of cells num_packs - how many in units days_since_manufacture - the older the yeast the less viable units - imperial, metric
Yeast Viability: lose 20% viability / month or 0.66% / day
Imperial: B / Gal / GU Metric: M / ml / Plato
Sources: - http://beersmith.com/blog/2011/01/10/yeast-starters-for-home-brewing-beer-part-2/
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set_units
(units)¶
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class
brew.utilities.yeast.
WhiteYeastModel
(method=u'no agitation', units=u'imperial')¶ Sources:
- http://www.brewersfriend.com/yeast-pitch-rate-and-starter-calculator/
- White, Chris, and Jamil Zainasheff. Yeast: The Practical Guide to Beer Fermentation. Boulder, CO: Brewers Publications, 2010. 139-44. Print.
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INOCULATION_CONST
= [-0.999499, 12.547938, -0.459486]¶
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METHOD_TO_GROWTH_ADJ
= {u'shaking': 0.5, u'stir plate': 1.0, u'no agitation': 0.0}¶
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get_growth_rate
(inoculation_rate)¶ initial_cells - Billion / gram extract (B/g)
G = (12.54793776 * x^-0.4594858324) - 0.9994994906
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get_inoculation_rate
(growth_rate)¶
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get_resulting_pitch_rate
(starter_cell_count, original_gravity=1.036, final_volume=5.0)¶
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get_starter_volume
(available_cells, starter_volume=0.5283443537159779, original_gravity=1.036)¶ Calculate the number of cells given a stater volume and gravity
-
get_viability
(days_since_manufacture)¶ Yeast viability drops 21% each month or 0.7% per day from the date of manufacture. Assume linear change.
-
get_yeast_pitch_rate
(original_gravity=1.05, final_volume=5.0, target_pitch_rate=1.42, yeast_type=u'liquid', cells_per_pack=100, num_packs=1, days_since_manufacture=30)¶ Determine yeast pitch rate
original_gravity - specific gravity of original beer final_volume - volume of the batch post fermentation target_pitch_rate - million cells / (ml * degP) yeast_type - liquid, dry cells_per_pack - Billions of cells num_packs - how many in units days_since_manufacture - the older the yeast the less viable units - imperial, metric
Yeast Viability: lose 20% viability / month or 0.66% / day
Imperial: B / Gal / GU Metric: M / ml / Plato
Sources: - http://beersmith.com/blog/2011/01/10/yeast-starters-for-home-brewing-beer-part-2/
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set_units
(units)¶
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yeast.
pitch_rate_conversion
(pitch_rate, units=u'imperial')¶ Pitch Rate Conversion
Input should be given in: Imperial: B / (Gal * GU) SI: B / (L * P)
Note: 1 M / (ml * P) == 1B / (L * P)