Author Topic: "Adjust Mash" vs "Strike/Infusion Temp" tool result differences?  (Read 6418 times)

Offline rwright

  • BeerSmith Apprentice Brewer
  • **
  • Posts: 3
I put the following data into the "Strike/Infusion Temp” tool:
Calculation = Infusion Step
Target Step temp = 168 F
Water to Add = 1.65 gal
Starting Water Volume = 2.75 gal
Weight of Grain = 8.75 lb
Initial Mash Temperature = 145 F
Mash Tun Weight = 0.00 lb
Infusion Water temperature = 211.9 F
Water/Grain ratio = 0.50 gal/lb


So the "Strike/Infusion Temp” tool is telling me that if I add 1.65 gal of 211.9 F water under these conditions the mash temperature will go from 145 to 168 degrees F.  From experience and other calculations, this is entirely believable.

Now, I try what I would expect to be the equivalent settings in the “Adjust Mash” tool:
Water Volume = 2.75 gal
Weight of Grain = 8.75 lb
Current Mash Temp = 145 F
Mash Tun Weight = 0.00 lb
Target Mash temperature = 168 F
Water Addition Temp = 211.9 F
Water Addition Needed = 1.08 gal
Final Water/Grain Ratio = 0.44 gal/lb


So now the “Adjust Mash” tool is telling me that if I add 1.08 gal of 211.9 F water under these conditions the mash temperature will go from 145 to 168 degrees F.

I would expect the results to be the same.  Why the water volume difference (1.65 vs 1.08 gal) between the two tools?  What am I misunderstanding?


Offline rwright

  • BeerSmith Apprentice Brewer
  • **
  • Posts: 3
Re: "Adjust Mash" vs "Strike/Infusion Temp" tool result differences?
« Reply #1 on: March 09, 2011, 04:42:06 PM »
One week bump.

What am I missing?

Offline 88Q

  • BeerSmith Grandmaster Brewer
  • *****
  • Posts: 145
Re: "Adjust Mash" vs "Strike/Infusion Temp" tool result differences?
« Reply #2 on: March 10, 2011, 08:23:31 AM »
I'll take a stab at this...

What I noticed is that in the first example you are "striking", that is adding water to dry grain..... which has one thermodynamic transfer rate...

And in example 2 you are adjusting the already existing wetted mash, which would have a completely different transfer rate...... resulting in a different (lesser) volume needed to accomplish the same temp rise, ultimately resulting in a  Final Water/Grain Ratio of 0.44 gal/lb as opposed to the original Water/Grain ratio of 0.50 gal/lb

Just my guess...........
« Last Edit: March 10, 2011, 08:25:18 AM by 88Q »
88Q

Offline rwright

  • BeerSmith Apprentice Brewer
  • **
  • Posts: 3
Re: "Adjust Mash" vs "Strike/Infusion Temp" tool result differences?
« Reply #3 on: March 12, 2011, 10:32:09 AM »
I set the starting water volume to 2.75 gallons for the Strike/Infusion so I think that makes it an infusion step (grain already wet).  Am I misinterpreting this?

I'd like to believe this is my misuse of the tools, but am beginning to wonder if this is a bug in BeerSmith.  I have heard that a new version of BeerSmith is under development, so it would be nice to get this sorted out before the next release.

Offline grathan

  • BeerSmith Grandmaster Brewer
  • *****
  • Posts: 734
  • BeerSmith 2 Rocks!
Re: "Adjust Mash" vs "Strike/Infusion Temp" tool result differences?
« Reply #4 on: September 02, 2012, 07:45:25 AM »
Having a similar issure here. Did you ever figure anything out? WHich numbers do you use now?