HomeRoast Digest


Topic: copper flashing as heat diffuser (14 msgs / 379 lines)
1) From: fs
I'm revamping my roaster by throwing away the 2 puny little 10K btu weber 
tubes and installing a camp chef 75000 btu blastofurnace crabcooker ring 
burner.
The problem is that the drum is solid SS 12" length 10" diameter with 
perferated shaft end and open cone front end and the burner ring is 4" 
diameter. I'm mounting a thin gauge copper shield as a heat diffuser about 
1/2" under the drum.
Any reasons not to?
thanks for any input
fred

2) From: Brett Mason
too thin may melt...
Brett
On 7/15/06, fs  wrote:
<Snip>
-- 
Regards,
Brett Mason
HomeRoast
   Zassman

3) From: miKe mcKoffee
	From: homeroast-admin
[mailto:homeroast-admin] On Behalf Of Brett Mason
	Sent: Saturday, July 15, 2006 2:58 PM
	
	too thin may melt...
	Brett
And make a nifty burnished coppered art piece out of the new burner. Sell it
for big bucks and buy a San Franciscan!-)
Kona Konnaisseur miKe mcKoffee
URL to Rosto mods, FrankenFormer, some recipes etc:http://mdmint.home.comcast.net/coffee/Rosto_mod.htmUltimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.
	On 7/15/06, fs  wrote: 
		I'm revamping my roaster by throwing away the 2 puny little
10K btu weber
		tubes and installing a camp chef 75000 btu blastofurnace
crabcooker ring
		burner.
		
		The problem is that the drum is solid SS 12" length 10"
diameter with 
		perferated shaft end and open cone front end and the burner
ring is 4"
		diameter. I'm mounting a thin gauge copper shield as a heat
diffuser about
		1/2" under the drum.
		
		Any reasons not to?
		
		thanks for any input
		
		fred

4) From: Aaron
Brett.   Copper melts at around 1981 Degrees F.  You'd have a heck of a 
time getting it quite that hot  Aluminum might melt but you'd be really 
pushing it to melt the copper.  I use propane to melt the gold I recycle 
but generally have to give it an oxy boost to get it up there, or just 
use mapp gas.  Now granted gold melts a bit higher however I think it 
should be safe with copper.
given it's corrosion properties, ... etc.... brass is another 
alternative unless one already has the copper when comparing prices for 
this stuff.  Stainless is also a great alternative and is probably a bit 
cheaper than copper.   Junk copper I can get 2 dollars a pound for now, 
copper sheet that is NOT junk.... ouch.
Aaron

5) From: Brett Mason
I used steel as a diffuser, and ended up with a mini Picasso ... dang thang
melted...  So I figerred Copper wold do the same...  Thx for the info, maybe
I need to find some copper...
Actually an old grill, cut to fit, with ceramic tiles over it would do
great....
Brett
On 7/15/06, Aaron  wrote:
<Snip>
-- 
Regards,
Brett Mason
HomeRoast
   Zassman

6) From: rnkyle
This is a multi-part message in MIME format.
I use 12 guage sheet metal can be found at any welding or fabricating =
shop, I been using it for 3 yrs now and it works great.
RK

7) From: Scott Marquardt
BTW, I've seen these pictures of "perforated ceramic tile" or somesuch.
Where the heck can one obtain that, and what on earth is its normal use in
the world?
- Scott
On 7/16/06, rnkyle  wrote:
<Snip>
-- 
Scott

8) From: Vicki Smith
I've bought it for use in our gas BBQ. It's in the section of almost 
every store that sells BBQ maintenance equipment. You substitute it for 
briquettes.
vicki
Scott Marquardt wrote:
<Snip>

9) From: fs
So Mike...
1. Brett was right.
2 I have a wonderful piece of artwork ready for you.
3. Whenever you are ready I'll send you my address- I willl take cash or 
check from you - I do appreciate your offer to subsidize my acquisition of a 
San Franciscan- that was what you meant wasn't it?
Ther roast was nearing total chaos.. 4 lbs of Guatamalan ...Burner too far 
away with Diffuser blocking too much heat .. slow ramp..kicked up 
flamethrower burner and softened  diffuser ends then drooping creating 
hotspot in center.. found some SS bicycle spokes that just fit in the side 
holes at the end to hold up drooping flashing in a sorta "W"....ultimately 
getting 1st crack around 11:30 and 2nd around 14:00 ... then I messed up 
pulling the beans out so it ran into the darket roast I've done in years 460 
bean temp and into Frenchroast land.... o well- life goes on.
So, this morning I brewed the FR GA and my wife liked the long lasting 
flavor... go figure...
lessons learned.
1. need better bean charging system. I need to drop 2400- 3000 gr of green 
beans preferably within 5 seconds
2. retiring the 4" crabcooker ring back to to crabpots and/or 50 gallon drum 
for boiling straw for pleurotus
3. found a 10" 60,000 BTU ring burner used in beer brewing that's getting 
ordered tomorrow.
4. System should kick out 5 lb cycles
5. chaff system needs working..........
I've got to let the coffee go as is ight now since I've got 12 quarts of 
inoculate mycelium and 50 lbs of sterilized woodchips in the laminar flow 
work (shoestring budget slapped together) needing to inoculate and seal up. 
Shiitake  (Lentinula edodus) and  Elm Oyster (Hypsizygus Ulmaris)
thanks for the inputs
fred

10) From: miKe mcKoffee
<Snip>
<Snip>
Post url to pictures, art auction starts 6pm PST Tuesday.
Hilarious!
Kona Konnaisseur miKe mcKoffee
URL to Rosto mods, FrankenFormer, some recipes etc:http://mdmint.home.comcast.net/coffee/Rosto_mod.htmUltimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.

11) From: Ed Needham
Do it in the name of science.  Why copper?
*********************
Ed Needham®
"to absurdity and beyond!"
ed at homeroaster dot com
(include [FRIEND] in subject line to get through my SPAM filters)
*********************

12) From: Ed Needham
Here's a link to the perfed ceramic blocks.http://www.grilllovers.com/shopitemdetail.aspx?itemidI84778&sc=There are other options, but they have worked well for me.
*********************
Ed Needham®
"to absurdity and beyond!"
ed at homeroaster dot com
(include [FRIEND] in subject line to get through my SPAM filters)
*********************

13) From: Brett Mason
I'll bid $5 for the artwork...
Brett
On 7/16/06, miKe mcKoffee  wrote:
<Snip>
-- 
Regards,
Brett Mason
HomeRoast
   Zassman

14) From: fs
why Cu?
thermal conductivity.(Btu per second per square inch per degree F)
  SS is abysmal
  steel is   .00034
  yellow brass   .00142
  red brass        .00157
  aluminum better  .00203
  Cu better.  .00404
  Silver is great  .00610 but I just didn't have the heart to do it or the 
pocketbook...
The reason was that I had a relative point source of heat that I wanted 
distribute as well as possible (4" into 12"). That was the plan at least.
as to others pointing out using the ceramic tiles which should give a 
reservoir of heat I'm actually going the other way of making a highly 
responsive heat chamber that doesn't have much thermal hysteresis other than 
the SS drum itself. I tend to data track roasts by the minute and build 
different profiles for comparision so I like the ability to induce 
significant change directly. I probe the bean mass directly and I sample for 
visual in addition to the aroma.
But as my friend said to me tonight as I relayed my chopped and channeled 
coffee roaster/roasting/ & mycelium/laminar flow/autoclaved inoculated 
hardwood shaving blocks weekend.... "it's a good thing you live out in the 
woods... if a neighbor saw what you do they'd probably have ya arrested...."
fred


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