I posted this in the Robust Porter Recipe Advice thread, but thought it would get lost in there so starting a new thread. Anyway......
Folks I brewed this yesterday and had some puzzling results with my efficiencies so just after some thoughts from others.
Recipe
Recipe Specifics
----------------
Batch Size (L): 24.00 Wort Size (L): 24.00
Total Grain (kg): 6.28
Anticipated OG: 1.060 Plato: 14.77
Anticipated EBC: 76.0
Anticipated IBU: 3.8
Brewhouse Efficiency: 75 %
Wort Boil Time: 60 Minutes
Pre-Boil Amounts
----------------
Evaporation Rate: 15.00 Percent Per Hour
Pre-Boil Wort Size: 28.24 L
Pre-Boil Gravity: 1.051 SG 12.65 Plato
Formulas Used
-------------
Grain/Extract/Sugar
% Amount Name Origin Potential EBC
-----------------------------------------------------------------------------
75.6 4.75 kg. TF Maris Otter Pale Ale Malt UK 1.037 6
9.6 0.60 kg. Weyermann Munich I Germany 1.038 15
4.8 0.30 kg. TF Chocolate Malt UK 1.033 940
6.4 0.40 kg. Weyermann Caramunich I Germany 1.036 100
3.6 0.22 kg. TF Black Malt UK 1.033 1270
TF grain was actually Bairds
Anyway as you can see I had my brewhouse efficiency at 75% (which Promash stats is your Mash Tun efficiency) , however mashing and when I recorded it in the kettle (just after I came to the boil) I got 1.062 which Promash tells me is 100% (Efficiency Calculator in Brewing session). Now even if I reduce my recorded volume (which was 31L) by 4% to account for the expansion of the wort at 100c that still has my Eff above 93%
Is it possible to get an efficiency that high?
Post boil after coiling I recorded the volume at 24L and into the fermenter at about 21.5 and a gravity of 1.071 (86% efficiency). In the kettle (before losses) that equates to about 89-90%
1.071 plugged into the recipe gives me an efficiency of 88%
Now to me these numbers just don't add up. I can see how a litre out in measurements here and there can make some difference, but the values all seem very high to me, are these numbers possible in a homebrew setup?
Secondly how can a measurement in the Kettle go from 100% start of boil (or 93% -4% volume for cooling) to 89-90% end of boil?
If anyone can offer some clarity that would be great.
All my measurements where done with a refractometer and I had another 2 blokes check them.
Folks I brewed this yesterday and had some puzzling results with my efficiencies so just after some thoughts from others.
Recipe
Recipe Specifics
----------------
Batch Size (L): 24.00 Wort Size (L): 24.00
Total Grain (kg): 6.28
Anticipated OG: 1.060 Plato: 14.77
Anticipated EBC: 76.0
Anticipated IBU: 3.8
Brewhouse Efficiency: 75 %
Wort Boil Time: 60 Minutes
Pre-Boil Amounts
----------------
Evaporation Rate: 15.00 Percent Per Hour
Pre-Boil Wort Size: 28.24 L
Pre-Boil Gravity: 1.051 SG 12.65 Plato
Formulas Used
-------------
Grain/Extract/Sugar
% Amount Name Origin Potential EBC
-----------------------------------------------------------------------------
75.6 4.75 kg. TF Maris Otter Pale Ale Malt UK 1.037 6
9.6 0.60 kg. Weyermann Munich I Germany 1.038 15
4.8 0.30 kg. TF Chocolate Malt UK 1.033 940
6.4 0.40 kg. Weyermann Caramunich I Germany 1.036 100
3.6 0.22 kg. TF Black Malt UK 1.033 1270
TF grain was actually Bairds
Anyway as you can see I had my brewhouse efficiency at 75% (which Promash stats is your Mash Tun efficiency) , however mashing and when I recorded it in the kettle (just after I came to the boil) I got 1.062 which Promash tells me is 100% (Efficiency Calculator in Brewing session). Now even if I reduce my recorded volume (which was 31L) by 4% to account for the expansion of the wort at 100c that still has my Eff above 93%
Is it possible to get an efficiency that high?
Post boil after coiling I recorded the volume at 24L and into the fermenter at about 21.5 and a gravity of 1.071 (86% efficiency). In the kettle (before losses) that equates to about 89-90%
1.071 plugged into the recipe gives me an efficiency of 88%
Now to me these numbers just don't add up. I can see how a litre out in measurements here and there can make some difference, but the values all seem very high to me, are these numbers possible in a homebrew setup?
Secondly how can a measurement in the Kettle go from 100% start of boil (or 93% -4% volume for cooling) to 89-90% end of boil?
If anyone can offer some clarity that would be great.
All my measurements where done with a refractometer and I had another 2 blokes check them.