Author Topic: Double Boiling, Double Fermentation  (Read 4695 times)

Offline denny

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Re: Double Boiling, Double Fermentation
« Reply #30 on: December 01, 2012, 12:24:11 PM »
Isn't it more or less common knowledge that a mash out can accelerate conversion? I know that when I incorporate one I can count on >95% conversion, whereas after a 60 min rest I've occasionally seen CE as low as ~85%.

Yeah, although I wouldn't call it a mash out if the purpose isn't to denature enzymes.  I've found that raising the grain bed temp at the end of the mash does increase my efficiency.  But I don't do any kind of rest with it.  Just stir in the water, vorlauf and run off.
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Offline a10t2

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Re: Double Boiling, Double Fermentation
« Reply #31 on: December 01, 2012, 12:56:20 PM »
Good point. I shoot for ~72°C, then recirculate for 15 min. I guess it's just an alpha-amylase rest at that point.
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Offline Kaiser

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Re: Double Boiling, Double Fermentation
« Reply #32 on: December 02, 2012, 07:13:47 AM »
It seems that many brewers still think the mash out boosts efficiency by making the wort less vicious add opposed to speeding up conversion. But Sean is correct, the conversion is boosted.

You can easily be at only 85% CE even with a 60 min mash. Especially with a coarse crush. I have seen this in my brewing.

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Offline dimik

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Re: Double Boiling, Double Fermentation
« Reply #33 on: December 02, 2012, 12:56:40 PM »
I see 60-65% eff all the time in my brewing and that's why I ask the homebrew store to crush my grains twice (they're nice enough to do it since we're all living in apartments here and almost none can afford such luxury as to have grain crushers or store sacks of grain at home) after which it goes up to 90 sometimes, but generally hangs around 75-80 for mid-grav brews. I'd love to get an even finer crush, but there is only so much that can be done in these conditions. Perhaps I misspoke... It generally takes me about 30 minutes to get the first runnings to the stove and do the rest of the mumbo-jumbo before I get to collect second runnings, so that's why my magical number is 30 minutes. Indeed I cannot see any possible boots in conversion with a mashout+second water since it denatures the enzymes, but I think it does boost up the solubilization and results in my observations. Anyway, I'm not saying "convert or die", just stating my observation and what works for me because it seems to be somewhat tangent to the topic of this thread.
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