Headspace vs Volume

Make grain beers with the absolute minimum of equipment. Discuss here.
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D4nny74
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Headspace vs Volume

Post by D4nny74 » Sun May 24, 2015 8:08 pm

OK last topic before I do this first BIAB tomorrow ,

beersmith 2 is saying i need 33.6ltrs to produce 19lts into the fermentor , are my calcs right ?

diameter is 33.5cm x 45cm deep , so for every cm I should have 1.052ltrs , which should leave 13cm of headspace in kettle ???

Am so confused I have opened a home-brew :o

cheers Danny
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Ren
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Re: Headspace vs Volume

Post by Ren » Sun May 24, 2015 8:20 pm

Sounds a bit too much. If i do biab i need 26l for 20 l batch, with 4kg of grain. But it depends on your boil off rate. I boil with lid on as there is a hole in it with a ducting going out the window. My boil off rate is 2.4 litres per 60 mins. Did you use biab profile from mash profiles?
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D4nny74
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Re: Headspace vs Volume

Post by D4nny74 » Sun May 24, 2015 8:22 pm

yes , medium body ?
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Ren
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Re: Headspace vs Volume

Post by Ren » Sun May 24, 2015 8:25 pm

D4nny74 wrote:yes , medium body ?
Biab Medium body or Medium body?
What is your boil off? Do you intend to boil for 60 mins?
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D4nny74
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Re: Headspace vs Volume

Post by D4nny74 » Sun May 24, 2015 8:29 pm

Ive put Biab medium body and the kit says 90 min boil , am having a total brain fart #-o
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Ren
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Re: Headspace vs Volume

Post by Ren » Sun May 24, 2015 8:33 pm

Well if kit says 90 mins then it should be fine I guess. What are you brewing?

If i would do 90 mins my tot mash water would be 28l so not far off. Have you accounted for a deadspace in your boiler?ANd what is your boil off again?
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D4nny74
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Re: Headspace vs Volume

Post by D4nny74 » Sun May 24, 2015 8:35 pm

pm’d you mate
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windrider
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Re: Headspace vs Volume

Post by windrider » Tue May 26, 2015 10:32 am

D4nny74 wrote:OK last topic before I do this first BIAB tomorrow ,

beersmith 2 is saying i need 33.6ltrs to produce 19lts into the fermentor , are my calcs right ?

diameter is 33.5cm x 45cm deep , so for every cm I should have 1.052ltrs , which should leave 13cm of headspace in kettle ???

Am so confused I have opened a home-brew :o

cheers Danny
Might be a bit late but 34 litres sounds about right. BIABacus is giving me the same sort of figure for a 19ltr volume into fermentor.

Once you've done a few batches you'll be able to customise it to your setup to adjust for boil off, kettle loss, shrinkage etc.
Ren wrote:Sounds a bit too much. If i do biab i need 26l for 20 l batch, with 4kg of grain. But it depends on your boil off rate. I boil with lid on as there is a hole in it with a ducting going out the window. My boil off rate is 2.4 litres per 60 mins. Did you use biab profile from mash profiles?
Blimey :shock: I boil off 5.4 litres for a 60 minute boil, so lose about 8 litres over a 90 min boil.
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