Help adjusting BiaBacus to assist low EAW - Efficiency of Ambient Wort

Post #1 made 1 month ago
Hi to all

after a debacle with my LHBS not milling my grain well I got my own mill recently and I mill quite fine. My first two batches using this mill has led to both batches (targets 1046 and 1048) being 6-7 gravity points short each.

My Biabacus for both is reporting the EAW - Efficiency of Ambient Wort of each to be 66%

I'm not wanting to change more than one variable at a time so my inclination is to leave the mill gap setting as is and adjust the Biabacus for my next brew to make up for the low EAW.

Can anyone provide help & advice how to do this. My Biabacus for both undershot batches is attached.

thanks
Nick
033 BIABacus PR1.3T - Pale Ale - Brewdog Hop Fiction.xls
034 BIABacus PR1.3T - APA - Nierra Sevada.xls
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Re: Help adjusting BiaBacus to assist low EAW - Efficiency of Ambient Wort

Post #2 made 1 month ago
Nick,

You have already looked at the crush of the grains, so double check the weight of grains, too.
I think you should extend your mash time from 60 minutes (as shown in your attached files) to 90 minutes. Then a 90 minute boil will drive off more water to give you a higher OG.

See https://www.biabrewer.info/viewtopic.ph ... 251#p58251 and https://www.biabrewer.info/viewtopic.ph ... 864#p56864 or use the search icon in the upper right to search mash time.

Bob

Re: Help adjusting BiaBacus to assist low EAW - Efficiency of Ambient Wort

Post #3 made 1 month ago
Hi Bob

thanks for the tips I will try the following to get a few extra points

* do some stirring (which I never do nowadays)
* mash out to improve the lauter (no I don't sparge but my bag did seem to be holding too much water with my new crush)
* Mash 90 (although I don't really believe in the necessity of that, I'm currently studying brewing and enzymes work a lot faster than that)

But all that being said I'd still like to know how to tweak Biabacus to give me some kind of contingency against the low efficiency inherent in my system?

Anyone who can give me some tips would be appreciated or I might just have to start meddling in section X ;-)

cheers
Nick
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Re: Help adjusting BiaBacus to assist low EAW - Efficiency of Ambient Wort

Post #4 made 1 month ago
Nick,

Stirring once midway during a 90 minute mash is good. I also check the temperature at that time and apply heat if down more than 1 ºC from target mash temp.

thughes mentions mash-out time here https://www.biabrewer.info/viewtopic.ph ... ime#p53581 I agree with his assessment.

PP tells it best in posts from 3 years ago:
https://www.biabrewer.info/viewtopic.ph ... ime#p37655
and here https://www.biabrewer.info/viewtopic.ph ... n+X#p38041
and here https://www.biabrewer.info/viewtopic.ph ... 9207#p9207

A long time ago, I saw that Section X should have 0.4 entered in the field for “Adjust Auto Kettle Efficiency by" It applied to version 1.3T at that time and I have not seen an update. Changing things in Section X will change your grain bill. Try some numbers and see.

Are you collecting runnings from the pulled bag in any way? I usually let it hang suspended above the kettle while heating the sweet liquor in the kettle toward the 90 ºC range. Alternatively, I put the bag in a large colander over a different collection vat and slowly add those runnings during the boil.

Taste the sweetness of the spent grains before disposal. A successful mash leaves almost no sweet taste behind, a less efficient mash leaves it sweeter. Sparging (holding water back from the mash for rinsing grains) via use of Section W in the BIABacus can increase your efficiency, but it comes with other costs.

Take note that everything is different if you are making a Märzen compared to making a big, dark beer.

Want an outsider’s opinion? Check https://www.homebrewtalk.com/forum/thre ... sh.219880/

Bob
Last edited by ShorePoints on 05 Mar 2018, 01:38, edited 1 time in total.

Re: Help adjusting BiaBacus to assist low EAW - Efficiency of Ambient Wort

Post #5 made 1 month ago
@ShorePoints : Thanks for digging up the links ;). I've just added a thirteenth point to Some Common Reasons for a Low Efficiency Reading. This refers to a crush being too fine or too coarse.

@Inconceivable : Hey there Nick! (Thanks for your email btw ;) ) This is a great question and, I hope you don't mind, but I'm going to answer it in some detail. Here you go...

Do you have a problem?

One great thing about The BIABacus is it is the only software that will tell you when something is not right. The BIABacus is telling you that you have a major problem. So, the subject of this thread should not be, "Help adjusting BIABacus to assist low EAW - Efficiency of Ambient Wort." Instead it should be something like, "Why are my kettle efficiencies (EIB and EAW) so low?"

You can use Section X of the BIABacus to change defaults as much as you want but that just covers up your problem, it does not fix it.

What to do when you do have a 'kettle efficiency' problem

Before your next brew...

Study Some Common Reasons for a Low Efficiency Reading. Print that list out and cross off anything that you have already double-checked. Check the others.

On your next brew/s...

It's really important when you have a kettle efficiency problem like this to measure, measure, measure. You need to take "volume and gravity sets." On the BIABaci you have posted, we don't have enough sets. Taking measurements sounds easy but it's not (e.g. measuring Volume into Boil or cooling hot gravity samples.) You need to plan the taking of them.

Enzymes

You mentioned above, "Mash for 90 mins (although I don't really believe in the necessity of that, I'm currently studying brewing and enzymes work a lot faster than that)."

This is a good example of how theory can lead us away from reality. Even in "Malting and Brewing Science," ($350 for both volumes), you'll find that the numbers are generally just based on very few experiments. If you look at this thread, you'll see many "real-life" numbers that show that an increase in mash time has a significant effect on extraction.

... so, to sum up, lots of things for you to check before your next brew and plan to take three "volume and gravity sets," on your next brew.

:peace:
PP
Last edited by PistolPatch on 06 Mar 2018, 22:20, edited 1 time in total.
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Re: Help adjusting BiaBacus to assist low EAW - Efficiency of Ambient Wort

Post #6 made 1 month ago
Hi to all,

Thanks for the help and advice.

Today I brewed a Porter targeting 1054 and 10 Litres VIF, taking advice from this thread to make my grind a shade more coarse AND to mash for longer and stir.

Preboil I was 1038 and I ended up with 1047 and 11.7L VIF plus 1L of nasty trub to discard. I run a very vigorous boil so there's no way I can boil any harder.

So perhaps I should post a new thread titled "Help adjusting Biabacus to adjust the boil off rate?" :luck:

Anyway I've not really had time to digest all the advice in this thread and will think some more before posting further questions

Any other tips'd be appreciated though

cheers
Nick
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