Get your HBT Growlers, Shirts and Membership before the Rush!


Home Brew Forums > Home Brewing Beer > Electric Brewing > eBIAB with passive recurculation
Reply
 
LinkBack Thread Tools
Old 09-19-2011, 06:35 AM   #1
Flyin
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Holland, MI
Posts: 98
Liked 2 Times on 2 Posts

Default eBIAB with passive recurculation

Can't sleep so I'm up testing an idea.

eBIAB kettle with a solid false bottom (upside down pie tin?) with a riser tube off to the side that stops at or just below the surface of the mash/wort. Much like an old perculator coffee pot but not needing to raise fluid above the surface.

Would there be enough circulation to even out the temps. I know it won't be as much as with a pump but how much is needed?

__________________
Flyin is offline
 
Reply With Quote Quick reply to this message
Old 09-19-2011, 06:52 AM   #2
Flyin
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Holland, MI
Posts: 98
Liked 2 Times on 2 Posts

Default

Possibly some kind of passive in kettle RIMs. A tube over the element with a riser at one end should increase flow.

Click for pic.

Edit: added pic

__________________
Flyin is offline
 
Reply With Quote Quick reply to this message
Old 09-19-2011, 05:00 PM   #3
stamandster
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2011
Location: springfield, ma
Posts: 761
Liked 51 Times on 44 Posts
Likes Given: 26

Default

Sounds interesting... is the water just going to seep into the bottom portion? I think the convection on the hot water lends itself to doing this on it's own without any funneling needed (some specialist will probably correct me on that). I mean you can test it, but, that's my hypothesis and I'm sticking with it

If the element was sticking straight up (in the middle like some pro systems) and was enclosed except for top and bottom areas you might see a better utilization of the natural convection process.

stamandster is offline
 
Reply With Quote Quick reply to this message
Old 09-20-2011, 12:08 AM   #4
Flyin
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Holland, MI
Posts: 98
Liked 2 Times on 2 Posts

Default

I've thought about the vertical element but the small batch size (3.5g) & grain bag make it difficult. In my 12"dia. 20qt kettle w/ a 7.5" element it would need 3.67g just to cover the element. The bag wouldn't be so bad, normal bag with a "sock" in the center to go over a cut down Sanke spear(?) covering the element. The center outlet for the riser should be good, I'm thinking the hot wort would spread fairly evenly across the top of the mash.

May have to try this later but right now another kettle is not on the buy list.

Last nights experiment was promising. With my collector covering only 11% of the heated area i could see a dome in the surface of the water above the riser. To check the flow I dropped a pinch of black pepper over the riser & in a couple seconds it spread to the edge of the kettle. I tried again away from the riser & it spread to about 2in dia. Thinking it might be a surface tension thing I tried again in a bowl of water & again it spread to about 2in dia.

At this point I'm planing to make the version in the drawing & work out the details as I find them.

Still hoping for more input on this.

__________________
Flyin is offline
 
Reply With Quote Quick reply to this message
Old 09-20-2011, 12:19 AM   #5
itsme6582
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2009
Location: Cleveland
Posts: 813
Liked 22 Times on 20 Posts
Likes Given: 23

Default

My money is on no. There isn't a big enough temp difference between the top and bottom of your pot.

__________________
itsme6582 is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Advice Please - eBIAB Build BeerMe21 Electric Brewing 6 07-16-2011 05:15 PM



Newest Threads

LATEST SPONSOR DEALS