jacketed direct fired keggle?

[aangel]

Hey all. I'm looking to insulate my direct fire keggles. I'm wondering what's out there since reflectix just melts. Is it possible to jacket the keggle with flashing?

 

[wilserbrewer]

Bobby M did it a few years ago w/ mineral wool or something like that...
https://www.homebrewtalk.com/showthread.php?t=154652

 

[purplehaze]

Whats the reasoning behind insulating your keggles; are you brewing outside in the cold or is this strictly for a Mash tun?

 

[aangel]

Outside in the cold. I rent and thus 240V's unobtainable...for now. Ooh...I like that mineral wool + sheet metal idea.

 

[aangel]

I'm also looking at welding blankets and this stuff: http://www.acousticalsurfaces.com/quiet_duct_wrap/images/qui_du.pdf

Wait nevermind that stuff, too pricey. Welding blankets and rock wool are where my attention's focused.

 

[purplehaze]

Take a look at the "Pot skirt" link below in my signature. That should give you some ideas and your in luck it works best on a keggle. You do need the welding blanket to help keep the wind from stealing too much heat. There is a link to a scientific paper in that thread. The link crunches some numbers for comparison, its an interesting read at the very least.

Let me know if you have any questions.

 

[aangel]

Sadly it's a dead link but that's really interesting. I can't believe how vigorous your boil is in that video.

 

[purplehaze]

aangel, I found the paper on www.bioenergylists.org


http://www.bioenergylists.org/files/ETHOS 2010 Skirt paper.pdf

 

[aangel]

Cool. Hmmm. So ideal seems to be very thin barrier, half a centimeter, between the kettle wall and metal flashing, then an inch thick layer of rock wool, and finally a wrap in flashing. I can do that. The rocket stove design calculator didn't work for me sadly.