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Old 10-17-2009, 10:22 PM   #1
eljib
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HELP please,
I'm in the middle of doing an all-grain with a cooler mlt for the first time and i never thought about how to calculate strike temp to hit my mash temp at dough-in.

I've got 11.5 lbs of 80*F grain going into a cooler MLT (pre-heated to 120*F) and i need to mash at 156-158*F

Sorry for the silly newb question, but how can I figure this out?

 
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Old 10-17-2009, 10:34 PM   #2
Catt22
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171 F should get you close assuming zero for the MT thermal mass since you preheated it.

 
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Old 10-17-2009, 10:50 PM   #3
jescholler
 
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It also depends on your mash thickness. For the future, here's the formula from How to Brew:

0.2/thickness*(mashtemp-graintemp) + mashtemp

thickness is your water to grain ratio in quarts/lb.
mashtemp is your desired mash temperature in degrees F
graintemp is the temperature of your grain before the mash in degrees F

This assumes your cooler has risen to the temperature of the water, which requires you to add the water at a little higher temperature than you will need.
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Old 10-17-2009, 10:55 PM   #4
mrk305
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I don't preheat, and 172 works for me. I sparge with two rinses of 185 each. My one hour mash measures 151 after 15 minutes and at the end of my sparges I am at 170.
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Old 10-17-2009, 11:04 PM   #5
Catt22
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Quote:
Originally Posted by jescholler View Post
It also depends on your mash thickness. For the future, here's the formula from How to Brew:

0.2/thickness*(mashtemp-graintemp) + mashtemp

thickness is your water to grain ratio in quarts/lb.
mashtemp is your desired mash temperature in degrees F
graintemp is the temperature of your grain before the mash in degrees F

This assumes your cooler has risen to the temperature of the water, which requires you to add the water at a little higher temperature than you will need.
Yes, I forgot about the water to grain ratio. I plugged his numbers into Promash as I knew he wanted a quick answer. My default setting is 1.2 quarts/lb. It will make a difference if he's much off of that ratio. Should still be fairly close though.

 
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Old 10-17-2009, 11:04 PM   #6
eljib
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thanks a million, everyone. I found a calculator that came up with 173, so i'm glad we're all in the same range. I think i might go a little high just to make sure my cooler doesn't suck up too much heat. I can just stir out the extra degrees if it's too high right?

 
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Old 10-17-2009, 11:27 PM   #7
mrk305
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That much grain does not cool much unless maybe it is real cold where you are. 173 should work anyway. Check your temps after about 15 minutes before adjusting.
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Old 10-18-2009, 06:33 AM   #8
eljib
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everything worked great and i hit my marks all around...thanks for the tips.

 
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