Author Topic: Water absorption by grain  (Read 30856 times)

nkiner

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Water absorption by grain
« on: October 01, 2007, 05:23:14 PM »
Is there a way to tweek the grain water absorption constant?  What value does beersmith presently use for this?

Thanks,

Nate

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Re: Water absorption by grain
« Reply #1 on: October 01, 2007, 11:21:24 PM »
Nate,
  Not sure if you are looking for this, but in the advanced tab on the options dialog there is an option for adjusting the amount of volume 1Kg of grain occupies (currently .652 l/kg).

Brad
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nkiner

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Re: Water absorption by grain
« Reply #2 on: October 02, 2007, 08:54:34 PM »
Well, I guess the two factors may be related, as I don't necessarily understand how you do your calculations.

What I'm after is this:  If you mash in with a certain amount of water, and then drain your tun in preparation for batch sparging, the volume of wort that comes out isn't equal to the water that went in.  Some of it remains absorbed in the grain.  I've seen numbers like 10lbs of grain absorb 1 gallon, 8lbs absorb 1 gallon, etc.  Beersmith obviously accounts for this in some manner.  I'm just wondering if you use some tweakable constant for this, or if its more complex than that.

Thanks,

Nate

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Re: Water absorption by grain
« Reply #3 on: October 03, 2007, 12:13:47 AM »
Nate,
  OK - I found what you want (it shows up best in the water needed view):  1 lb of grain absorbs approx 0.12 gal of water, so 10 lb is 1.2 gal of water, etc...  Unfortunately this parameter is currently not adjustable.  I'll certainly look at making it so in the future.

Cheers!
Brad
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nkiner

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Re: Water absorption by grain
« Reply #4 on: October 06, 2007, 08:49:32 PM »
Thanks for the info.  BTW, I've been a user for over a year and love the program.  Keep up the good work.  :)

scottfro

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Re: Water absorption by grain
« Reply #5 on: December 12, 2008, 11:23:20 AM »
I'm going to bring this topic back from the dead as I'm really hoping water absorbed by the grains can be a tweakable feature soon.  The default of .12 gal per lb isn't what I get with my setup and its the only thing restricting Beer Smith's water usage calculations from being dead on with what I need.

Any chance its coming soon?

Cheers!

Offline Henway

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Re: Water absorption by grain
« Reply #6 on: December 22, 2008, 11:07:07 AM »
Ditto for me too.

Flaked Wheat and Flaked Oats seem to absorb a heck of a lot more than grain (I searched the internet for a absorption G/lb to no avail).

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Re: Water absorption by grain
« Reply #7 on: December 22, 2008, 06:58:16 PM »
I'll add it in the next version.

Cheers,
Brad
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Offline BrewerBC

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Re: Water absorption by grain
« Reply #8 on: February 24, 2011, 06:37:18 PM »
Its been a while since this topic was brought up and I was wondering if this wver happened?

Offline mattldm

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Re: Water absorption by grain
« Reply #9 on: February 27, 2011, 09:11:22 AM »
I too would like to know if this is something that will be added! Beersmith works great, but I always have to add additional strike and sparge water to reach my desired volume. I think the grain is soaking up more water than beersmith is accounting for!

thanks

Offline winvarin

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Re: Water absorption by grain
« Reply #10 on: April 01, 2011, 03:10:12 PM »
I'd like to throw my hand up here. My calculated grain absorbtion is slightly higher than the .12 used here. I would like to be able to tweak it.

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Re: Water absorption by grain
« Reply #11 on: April 01, 2011, 11:17:54 PM »
Tweaking will be included in the next version (2.0) under advanced options.  I've added it...

Brad
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