Primary energy consumption vs losses of malt extract Thoughts concerning the last runnings-threshold. Dr. Roland Pahl VLB Berlin

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1 Primary energy consumtion vs losses of malt extract Thoughts concerning the last runnings-threshold Dr. Roland Pahl VLB Berlin

2 Last runnings The low concentrated wort running last out of lautering is called last runnings. (W. unze, 9. Edition) Threshold of last runnings: Limit value of extract (in the last runnings) at which extract gain and costs for evaoration are equal. (H. Petersen, 2. Auflage) Publications: Brauerei-Rundschau 1980 Brauwelt, 2003 Brauindustrie 2006 Der Weihenstehaner, 2007

3 Energy savings in the brewhouse At first: total evaoration Formerly % Nowadys ~ 4 5 % High gravity Efficiencies recueration

4 ey aramters of wort boiling DMS oag. N. TBZ Acc.: TECHNOLOGIE Brauer & Mälzer, W. unze, 9. Auflage Evaorating water: necessary?

5 Lautering rocess TECHNOLOGIE Brauer & Mälzer, W. unze, 9. Auflage

6 Last runnings threshold Common formula SHA r E E cast SHA out P M dt c cast r out with: SHA: Brewhouse yield (/) E: Energy rice (/) Ausschl : Extract concentration of cast out wort (/) dt: Temerature gradient of kettle full wort to boiling [] c: secific heat caacity ( ~ 4,2 / ) P M : Malt rice (/dt) r: Enthaly of evaoration (water) (2256,9 /)

German examle Price for light fuel oil (14.9.2010) ~ 0,66 /l (www.esyoil.

7 German examle Price for light fuel oil ( ) ~ 0,66 /l ( Malt rice in the last 5 years: ~ 250 /t /t ) Brauerei-Anlagen, H. Brewing Petersen, Conference 2. Auflage Bangkok 2011

8 2006 Metzger, Wasmuht, Gattermeyer, BrauIndustrie, 10/2006

9 Guiding values for washable extract in sent grains Washable extract in wet sent grain max. 0,8 % (acc. MEBA II and DIN 8777 (2010): max. 4 % in dm) squeezing sent grains P [%] Washable extract= P, to reach 0,8 % washable extract (at 80 % moisture) : ar. 1 % E wash. P Watercontent P

10 Washable extract / last runnings concentration Guiding values for sent grains extract Value for economic otimisation Effectivity of sarging rocess E.g. under commissioning conditions Adjusting evaoration rates if no HG Minimizing batch size if HG ( heating, cooling, vessel etc.) Adjustment to changing conditions MALT ENERGY

11 attention! Two different formulas! SHA r E E Ausschl SHA P M dt c r Ausschl SHA r E E SHA Ausschl P M dt c r Ausschl Original formula from Prof. Petersen, also ublished by Anderegg, Schur und Pfenninger,

12 Attention! Ausschl M Ausschl P SHA E r r c dt E SHA 4,1 80% 0, ,5% 50 ) ,2 (30 11,5% 0, % 0,041 0,8 0, , ) ,2 (30 0,115 0, ,8

13 Achtung! Ausschl M Ausschl P SHA E r r c dt E SHA 11,9 80% 0, ,5% 50 ) ,2 (30 11,5% 0, % 0,119 0,8 0, , ) ,2 (30 0,115 0, ,8

14 Attention! , ,5 Simlification!! But it shows where the different values come from.

15 Attention! Formula focusses on traditional NON-HG rocesses Weak wort is often used The exact determination of an energy rice must include energy recuoeration! E.g.: Vaour comressor Vaour condenser Water evaoration often adjusted to re-use of heat energy

16 Brewhouse yield The brewhouse yield imroves, the more you sarge (!) Themoresarging, themorewaterisin therocess A higher brewhouse yield does not have to be the economically best result Heating u sarging liquor Treating sarging liquor Heating mash Heating wort Cooling beer More gained extract

17 Saving otential - Examle 800 hl cast out wort Total evaoration lowerd from 8 %, to 6 % saving of 16 hl evaorated water = 1600 evaoration enthaly of water = 2 MJ / savings of 3200 MJ ro Sud (german energy rice: 0, /) 3200 MJ = 51 er brew 1 is about 40 baht 2040 baht er brew

18 Saving otential - Examle 16 hl less last runnings 16 hl with ar. 2 % Extract = 32 less extract er brew with OBY = 80 % 32 Extract = 40 Malt with 250 /t 40 Malt = 10 less extract er brew around 400 baht less extract 2040 baht 400 baht = 1640 baht saved by lowering total evaoration

19 Another side of the story Quality of extract in last runnings Some brewers don t even want to gain the very last kilograms of extract Cold last sargings ( )

Conserving resources, reducing energy costs. engineering for a better world

Conserving resources, reducing energy costs. engineering for a better world Energy and environment are in the focus... Exploring the opportunities together Determining the energy savings potential in your