Quote:
Originally Posted by Got Trub?
100% is only possible in the laboratory.
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100% conversion efficiency is certainly possible but you may have to work for it by either milling really fine (which may cause you to spend the whole day lautering) or use a decoction schedule during which all or almost all the grain is boiled.
Quote:
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I was just listening to one of Jamil's podcasts where he discussed not trying to get much > 70% efficiency to avoid extracting undesirable flavours. It was either the Kolsch or the Dusseldorf Alt podcast.
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Now what Jamil is talking about here is the efficiency into the kettle. This includes lautering losses and I agree with him that you need to leave some efficiency behind at this stage for wort quality sake. I don't agree with his 70% though and for me that number is more like 80-85%.
But what needs to be taken into account here is how did you get the 70%:
I can have a very poor conversion efficiency of 75% and excessive lautering with an efficiency of 93%. The combined efficiency is 70% but the intensive lauter may have caused oversparging. Or I can have a very good conversion efficiency of 93% or more and a very relaxed lauter with an efficiency of 75% (this can easily achieved with no-sparge) which will produce a very high quality wort. If you ask me I'll take the latter of the two options.
I get my 80-85% from aiming for a conversion efficiency of 95%. I then need a lauter efficiency of 84-89% which can easily be achieved with a 2 run-off batch sparge and only 15% boil off.
Kai
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