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Old 10-19-2007, 06:55 PM   #1
D*Bo
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Default Quick check on my calculations (brewing in a few min)

First all grain, batch sparge with stainless braid in an Igloo cube.
10 gal batch
18 lbs of grain
149* mmash temp

11.5 gallons in the kettle (+ 1.8 qt for absorption, call it 2qt) 48 qt total

1.33 qt/lb 24 qts in the mash (do you add for grain absorption?)
161.8* strike water temp

My calculation came up with 12.5 qt of boiling water to add to bring the mash temp from 148 to 168.
(T2-T1)(.2G+Wm)/(Tw-T2)

leaves 11.5 qts to split between two sparges. Does this seem right?

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Old 10-19-2007, 07:29 PM   #2
ErikH
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Quote:
Originally Posted by D*Bo
First all grain, batch sparge with stainless braid in an Igloo cube.
10 gal batch
18 lbs of grain
149* mmash temp

11.5 gallons in the kettle (+ 1.8 qt for absorption, call it 2qt)

1.33 qt/lb 24 qts in the mash (do you add for grain absorption?)
161.8* strike water temp

My calculation came up with 12.5 qt of boiling water to add to bring the mash temp from 148 to 168.
(T2-T1)(.2G+Wm)/(Tw-T2)

leaves 11.5 qts to split between two sparges. Does this seem right?
If you can fit the 18# of grain + 24 qts. of strike water + 12 qts. of water to get to mashout temps, why do 2 sparges? Just do one and get it over.

Also, 18# of grain is going to absorb 2.5 gallons of water or more.

By my calculations using the tastybrew calculator, dough in with 24 qts of 161* water to get to 149*. Then add 12 qts. boiling water to get to 168*. That should yield about 6.5 gallons of wort. Then sparge with 5 gallons of water.
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Old 10-20-2007, 12:46 PM   #3
D*Bo
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Thanks Erik.
Everything worked out all right.

I was going to do two sparges off of something I had read the other day.

Well I guess I'll find out if HSA is a myth. My system started sucking in air and was blowing bubbles into the sweet wort.

I've got to make some changes to my setup. Definately need to pick up a keg and add sight glasses for a hot liquer tank. And make a brew sculpture.

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PrimaryBaltica 9
Secondary British all Amarillo IPA, Calypso
Conditioning Decoction maddness, FlyingJess Ale
Drinking Oatmeal Chocolate Stout, Oaked Bourbon Chocolate Stout, Dry Mead)
Up NextScottish ale and Dopple Bock

Always ready for the wack snack attack, I carry sandwiches around in a straight edge style JanSports backpack.

Support your local businesses
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