Brew Day: Banana Cake Dunkel-January 19, 2011

Brewday: Banana Cake Dunkel - January 19, 2011

Recipe Values:

Volume to fermenter[ltr (gal)]:	22.00	Total volume[ltr (gal)]:	25.71	Losses [ltr (gal)]:	3.71
Original Gravity[SG]:	1.035	Colour [SRM(EBC)]:	29.84(58.78)
Mash Efficiency [%]:	75.00%	Bitterness[IBU]:	12.45

Preboil Values:

Mash water volume [ltr (gal)]:	17.61 (4.65)	Mash tun volume [ltr (gal)]:	27.28 (7.21)	Mash tun loses [ltr (gal)]:	2.00 (0.53)
Preboil wort volume [ltr (gal)]:	28.00 (7.40)	@ mash out temp.	28.67 (7.57)	Preboil gravity [SG]:	1.044

Postboil Values:

Evapouration [ltr (gal)]:	4.00 (1.06)	Evapouration Rate [ltr (gal)/hr]:	4.00 (1.06)	Boil time [Minutes]:	60.00
Postboil wort volume [ltr (gal)]:	25.71 (6.79)	@ boiling temp.	26.79 (7.08)	Boiler lose [ltr (gal)]:	2.00 (0.53)
Postboil target gravity [SG]:	1.051	mash items only	1.051

Style: 15B. Dunkelweizen

Description:

Banana cake tasting dunkelweizen

Estimated Original Gravity[SG]: 1.051	Estimated Final Gravity[SG]: 1.013	Alcohol By Volume[%]: 5.10
Bitterness [IBU]: 12.45	Colour [SRM(EBC)]: 29.84 (58.78)
Balance: 0.510	BU:GU ratio: 0.245

Fermentables

Type	Gravity [SG]	Gravity(%)	Weight [gms (lbs)]	Weight(%)
Carawheat (Wyermann)	1.008	15.87%	1118.01 (2.46)	19.05%
Maris Otter Malt (Thomas Fawcetts Floor Malted)	1.010	19.34%	1118.01 (2.46)	19.05%
Munich Malt - 20L	1.010	18.86%	1118.01 (2.46)	19.05%
Wheat Chocolate Malt (Weyermann)	1.002	3.90%	279.50 (0.62)	4.76%
Wheat Malt, Ger	1.021	42.03%	2236.02 (4.93)	38.10%

Hops

Hop Utilisation Method: Tinseth

Type	AA(%)	IBU	IBU(%)	Weight [gms (oz)]	Time(minutes)
Perle	8.25%	12.45	100.00%	27.95 (0.99)	20.00
Hallertau Tradition German	6.00%	0.00	0.00%	18.67 (0.66)	0.00

Yeast

Type	Flocculation	Attenuation	Min Temp[C (F)]	Max Temp[C (F)]	Alcohol Tolerance
Weihenstephan Weizen - Wyeast 3068	low	75.00%	18.00 (64.40)	24.00 (75.20)	10% ABV

Estimated required yeast cells (billion):

144.38

Dried yeast (gm):	7.68

No of liquid yeast(Wyeast/Whitelabs) packs:	1.54	(Assumes 94% viability)

Approximate amount of solid slurry (ml):
One hour settling	204.79	(Assumes 25% trub and 94% viability)
One day settling	102.39	(Assumes 25% trub and 94% viability)
Longer than 1 week settling	53.47	(Assumes 25% trub and 80% viability)

Note yeast viability reduces greatly over time as demonstrated in the table below.

Age	Viability	Age	Viability
1 week	80%	2 weeks	70%
3 weeks	60%	4 weeks	50%
5 weeks	40%	6 weeks	25%
7 weeks	15%	8 weeks or older	less than 10%

Viability deterioration varies greatly between different yeast strains. You should consider doing a yeast starter for any yeast older than 2 weeks to ensure yeast viability prior to pitching.

Liquor to grist ratio [ltr/kg]:

Saccrification rest - 3.00 to 4.00 [ltr/kg] is recommended.

A lower liquor to grist ratio will produce a less fermentable wort (with more complex sugars) while a higher liquor to grist ratio can result in a more fermentable wort.

Both extremes will require a longer rest time ( up to 90 minutes )

Protein rest - less then 2.50 [ltr/kg] is recommended.

Mash Schedule

Name	Method	Step temp [C (F)]	Step time [minutes]	Addition amount [ltr (gal)]	Addition temp [C (F)]	Liquor/grist ratio [ltr/kg]
Saccrification	Direct	67.00 (152.60)	60	0.00 (0.00)	0.00 (32.00)	3.20

Mash Details

Mash water required [ltr (gal)]:	17.61 (4.65)	Mash tun volume required [ltr (gal)]:	27.28 (7.21)
Grain Weight [gms (lbs)]:	5869.56 (12.94)	Mash gravity @ 100% conversion [SG]:	1.046

Number of batches:

General:

Minimum required efficiency:	75.00 %	Max expected efficiency	83.98 %

Sparges:

Sparge No	Water addition [l]	Expected recovered volume [l]	Required gravity	Max expected gravity
1	5.74	14.00	62.69	74.49
2	14.00	14.00	25.09	29.82
Combined	19.74	28.00	43.89	52.15

Assumed constants:

The following are assumed in calculations below and will eventually be able to be set.

Absorption [l/kg]:	1.3	Grain displacement [l/kg]:	0.67