Brew Day: Jamieson Doppelbock-May 24, 2009

Brewday: Jamieson Doppelbock - May 24, 2009

Recipe Values:

Volume to fermenter[ltr (gal)]:	21.00	Total volume[ltr (gal)]:	28.45	Losses [ltr (gal)]:	7.45
Original Gravity[SG]:	1.071	Colour [SRM(EBC)]:	16.68(32.87)
Mash Efficiency [%]:	70.00%	Bitterness[IBU]:	24.60

Preboil Values:

Mash water volume [ltr (gal)]:	21.64 (5.72)	Mash tun volume [ltr (gal)]:	32.16 (8.50)	Mash tun loses [ltr (gal)]:	4.00 (1.06)
Preboil wort volume [ltr (gal)]:	29.00 (7.66)	@ mash out temp.	29.69 (7.84)	Preboil gravity [SG]:	1.046

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)]:	28.45 (7.52)	@ boiling temp.	29.63 (7.83)	Boiler lose [ltr (gal)]:	4.00 (1.06)
Postboil target gravity [SG]:	1.071	mash items only	1.053

Style: 5D. Eisbock

Description:

Wort brewed at Jameisons brewery and taken away to ferment.

Was mashed at 67C

Water treatment

24gms of citric acid

500gms Calcium Sulfate

Estimated Original Gravity[SG]: 1.071	Estimated Final Gravity[SG]: 1.018	Alcohol By Volume[%]: 7.17
Bitterness [IBU]: 24.60	Colour [SRM(EBC)]: 16.68 (32.87)
Balance: 0.716	BU:GU ratio: 0.345

Fermentables

Type	Gravity [SG]	Gravity(%)	Weight [gms (lbs)]	Weight(%)
Ale Malt (Barrett Burston)	1.043	60.33%	5816.66 (12.82)	67.35%
Caramunich Type 2 Malt (Weyermann)	1.002	2.40%	254.00 (0.56)	2.94%
Malt Extract - Light	1.019	25.94%	1422.42 (3.14)	16.47%
Munich I Malt (Weyermann)	1.004	5.13%	508.01 (1.12)	5.88%
Munich II Malt (Weyermann)	1.004	5.13%	508.01 (1.12)	5.88%
Wheat Chocolate Malt (Weyermann)	1.001	1.06%	127.00 (0.28)	1.47%

Hops

Hop Utilisation Method: Tinseth

Type	AA(%)	IBU	IBU(%)	Weight [gms (oz)]	Time(minutes)
Tettnang	4.50%	22.80	92.68%	70.77 (2.50)	90.00
Tettnang	4.50%	1.80	7.32%	9.87 (0.35)	20.00

Yeast

Type	Flocculation	Attenuation	Min Temp[C (F)]	Max Temp[C (F)]	Alcohol Tolerance
Bavarian Lager - Wyeast 2206	medium-high	75.00%	8.00 (46.40)	14.00 (57.20)	9% ABV

Estimated required yeast cells (billion):

561.84

Dried yeast (gm):	29.89

No of liquid yeast(Wyeast/Whitelabs) packs:	5.98	(Assumes 94% viability)

Approximate amount of solid slurry (ml):
One hour settling	796.94	(Assumes 25% trub and 94% viability)
One day settling	398.47	(Assumes 25% trub and 94% viability)
Longer than 1 week settling	208.09	(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)]:	21.64 (5.72)	Mash tun volume required [ltr (gal)]:	32.16 (8.50)
Grain Weight [gms (lbs)]:	7213.67 (15.90)	Mash gravity @ 100% conversion [SG]:	1.057

Number of batches:

General:

Minimum required efficiency:	70.00 %	Max expected efficiency	77.97 %

Sparges:

Sparge No	Water addition [l]	Expected recovered volume [l]	Required gravity	Max expected gravity
1	5.69	14.50	63.05	78.58
2	14.50	14.50	29.60	36.88
Combined	20.19	29.00	46.32	57.73

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