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Old 06-12-2012, 01:35 PM   #1
Rottnme
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Default Batch sparge temp calc help?

I have found with my system that I get the best and most consistent results when I do a double batch sparge. My issue is that I want to be more consistent with hitting temps in the 165-170F range when I sparge rather than having the first sparge get me 3/4 of the way there and the second getting me where I want to be.

I typically figure out my volumes such that I determine my mash water volume and then work it out so that I have approximately 1qt per pound left over for each batch sparge. Therefor what I have is a determined amount of sparge water that needs to be at a determined temperature to bring the mash temp up to this mash out temp. I am looking for a calculater to help me do this on the fly as I heat the sparge water.

A little about my system and process that may help... I use a converted cooler mash tun, and as is to be expected, I lose a couple of degrees (2-6 depending) during the mash. Then, when draining my runnings, I lose a few more degrees. This is where the problem comes in. When that hot thermal mass of water leaves the mash it cools quickly and can lose as much as 10-15F during running out and before I sparge in. I want to be able to take a temp of the grain at this point, plug in in to a calculation and have a required temp for my determined amount of sparge water.

Has anyone ever created or found a calulator that will do this?

Thanks, Rott



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Old 06-12-2012, 02:15 PM   #2
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I don't have a good calculator for you.

But in my personal opinion, this is not worth the effort. Just get the sparge water hot. I have found no appreciable, statistical difference in efficiency using 150 versus 180 degree sparge water. Unless you're measuring with precise lab equipment, the difference is well within most system's margin of error and cannot be measured to be statistically significant.

It's definitely possible to calculate it, but I wouldn't slow my brew day to "nail" this. I just don't think it's important.



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Old 06-13-2012, 12:23 PM   #3
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Yeah, I know it's not really needed but as part of my anally retentive nature it makes me feel like i'm doing a better job. I just figured that someone here may be able to point me to something like this.

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Old 06-13-2012, 01:05 PM   #4
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Originally Posted by Rottnme View Post
Yeah, I know it's not really needed but as part of my anally retentive nature it makes me feel like i'm doing a better job. I just figured that someone here may be able to point me to something like this.
Don't waste your time, the temperature of the water you use to sparge only needs to be above 168 as you are only rinsing the sugars from the grist at this point, there is no conversion occurring and since the water is not soaking for any period of time there should really be no significant heat loss as the sparge water drains through the grain bed. I usually try to hit around 170 +/- in two equal batches. If your cooler has enough space you can also do one larger sparge at a slightly slower rate
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Old 06-13-2012, 02:02 PM   #5
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This is the calculator I use. You can dial in your strike and mash temp for step one and then it will take you to a screen for step two. There's a section where you can enter "current temp" which is where you would enter the temp of the grain bed after lautering the mash...
http://www.tastybrew.com/calculators/infusion.html

It works great for calculating your infusion temps. As mentioned above, the sparge temp isn't critical as long as you don't get the grain bed temp higher than 170F. That doesn't mean the water can't be higher than 170F, though... As soon as it hits the grain the temp drops just like when you dough in. With all of this said I plan on experimenting with "cold sparging" on my next batch. I hear a lot of good things about it..

Good Luck

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Old 06-13-2012, 08:03 PM   #6
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Originally Posted by Rottnme View Post
I have found with my system that I get the best and most consistent results when I do a double batch sparge. My issue is that I want to be more consistent with hitting temps in the 165-170F range when I sparge rather than having the first sparge get me 3/4 of the way there and the second getting me where I want to be.

I typically figure out my volumes such that I determine my mash water volume and then work it out so that I have approximately 1qt per pound left over for each batch sparge. Therefor what I have is a determined amount of sparge water that needs to be at a determined temperature to bring the mash temp up to this mash out temp. I am looking for a calculater to help me do this on the fly as I heat the sparge water.

A little about my system and process that may help... I use a converted cooler mash tun, and as is to be expected, I lose a couple of degrees (2-6 depending) during the mash. Then, when draining my runnings, I lose a few more degrees. This is where the problem comes in. When that hot thermal mass of water leaves the mash it cools quickly and can lose as much as 10-15F during running out and before I sparge in. I want to be able to take a temp of the grain at this point, plug in in to a calculation and have a required temp for my determined amount of sparge water.

Has anyone ever created or found a calulator that will do this?

Thanks, Rott
Keep in mind that once you've reached conversion, it doesn't matter what the temp of your sparge water is as long as it isn't so high that it leeks tannins into your wort. I've used the tastybrew calculator and it will get you close enough. And like the others have said, if you don't hit your temps exactly, don't sweat it. It isn't critical. Also, doing a double batch sparge might get you a point or two of eff. but in my view isn't worth the extra work - unless you LIKE doing extra work. After all, this IS our passion.
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Old 12-16-2012, 02:24 AM   #7
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Gents,

I'm with the original dude who posted this. I have been racking my brain trying to determine this in order to satisfy a desire to stop enzyme activity after the 1st runoff. It become more complicated than the tasteybrew calc because this calculator will indeed tell you the amount of water to add to reach 168 (or desired mahout), however in a batch sparge the idea is to add 1/2 the desired wort volume. That's where the tasteybrew calculator falls short. Hypothetically, what if i am only to add 1.75 gallons to hit 168, bur need 3 gallons to reach my desired final pre-boil volume. Common sense tells me to at that point just add the remaining amount at 165 degrees to ensure it doesn't get too high. Am I correct in assuming this?

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Old 12-16-2012, 02:57 AM   #8
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Gents,

I'm with the original dude who posted this. I have been racking my brain trying to determine this in order to satisfy a desire to stop enzyme activity after the 1st runoff. It become more complicated than the tasteybrew calc because this calculator will indeed tell you the amount of water to add to reach 168 (or desired mahout), however in a batch sparge the idea is to add 1/2 the desired wort volume. That's where the tasteybrew calculator falls short. Hypothetically, what if i am only to add 1.75 gallons to hit 168, bur need 3 gallons to reach my desired final pre-boil volume. Common sense tells me to at that point just add the remaining amount at 165 degrees to ensure it doesn't get too high. Am I correct in assuming this?
I just play with the infusion temp on tastybrew until I get it to come out to the volume I need.

In other words if I just need 3 gallons of sparge water to make up my boil volume, then I'll start by entering an infusion temp of 185F. If it says I'll need more than 3 gallons, then I just raise the temp on the calculator until it gets to the 3 gallon mark. I've had to raise it as high as 202F before to get the grain bed to 168-170F.

I hope that makes sense and answers your question...


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