HLT with stirrer okay with lodo ?

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adam
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HLT with stirrer okay with lodo ?

Postby adam » Thu Dec 01, 2016 1:13 am

I have a HLT inside a cooler that uses an ice cream stir paddle and motor to stir the water.
Its a slow stir - maybe 60rpm.

Will this enable too much O2 diffusion to be of value for a lodo process ?

Thanks.
UnsungSavior16
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Re: HLT with stirrer okay with lodo ?

Postby UnsungSavior16 » Thu Dec 01, 2016 10:09 am

You should check out Weizenberg's mash tun. He doesn't have a cap, and his mash tun stirs (agitates) the mash.
Techbrau
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Re: HLT with stirrer okay with lodo ?

Postby Techbrau » Thu Dec 01, 2016 10:19 am

Can you slow it down even more? 1 rpm is enough. The more of a vortex you get the more oxygen will diffuse in. You don't really want a vortex at all, and you don't want to disturb the liquid surface IMO.
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Weizenberg
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Re: HLT with stirrer okay with lodo ?

Postby Weizenberg » Fri Dec 02, 2016 1:14 pm

adam wrote:I have a HLT inside a cooler that uses an ice cream stir paddle and motor to stir the water.
Its a slow stir - maybe 60rpm.

Will this enable too much O2 diffusion to be of value for a lodo process ?

Thanks.


As long as you don't get a Vortex then you are fine. I'd keep the lid on as well (if you have one). It's not difficult to build one though, but be careful not to introduce petrochemicals into your beer (that can have some unwanted nasty long-term effects on your body).

My agitator is powered by a DC motor and is regulated via one of these (cheap) PWM controllers.

My speeds are usually around 50 RPM which is enough and doesn't introduce a vortex. If your agitator design is different you may need to use different speeds. Too slow isn't good either. Professional breweries control the agitator via a frequency converter.

Indeed, I never felt the need for a mash cap.
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adam
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Re: HLT with stirrer okay with lodo ?

Postby adam » Fri Dec 02, 2016 9:10 pm

So I timed the stirrer. Its 40 RPM. I've never seen a vortex from it. I have a lid on it to keep the heat in, but there is a headspace to it of an inch when its full. This is good.

Thanks all.
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Weizenberg
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Re: HLT with stirrer okay with lodo ?

Postby Weizenberg » Sat Dec 03, 2016 5:45 am

40 RPM should work really well!
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Ancient Abbey
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Re: HLT with stirrer okay with lodo ?

Postby Ancient Abbey » Mon Feb 27, 2017 8:41 am

adam wrote:So I timed the stirrer. Its 40 RPM. I've never seen a vortex from it. I have a lid on it to keep the heat in, but there is a headspace to it of an inch when its full.


For mash rakes, Kunze advocates 25 RPM when heating, 9 RPM during rests. It's not a HLT, but a solid point of reference nonetheless.
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