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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Turbo Oven Roasters

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High agitation radiant roaster
farmroast	#1 Posted on 10/16/2010 10:53 AM
1/2 Pounder Posts: 295 Joined: December 20, 2006	I've been working up a new roaster design. It uses a couple of the concepts of my Dreamroast homebuilt. But instead of being primarily convection I want to add more radiant heat application. I'm planning on using my bean bat high speed whirling of the beans for great agitation and even roasting. Instead of adding the convection/turbo oven top on the top of the pot I want to place a heating element in the middle of the pot to utilize the radiance off the element. For a simple off the shelf element I'm considering a heat gun replacement element. The can be had for $20-50. I will add a stainless steel screen around the element. I will use my chaff canister and slit in the roasting pot side to collect the chaff. I'm not sure a fan will be necessary as the high speed bean flow may add enough of the convection needed. This will conserve heat. If needed a small fan could be added to the lid. I'm still at the early stage of the concept but think it may have some potential. Shooting for a full lb. batch size that could be enlarged to do larger roasts using more than one element and a larger pot. Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


allenb	#2 Posted on 10/16/2010 11:17 AM
Administrator Posts: 3684 Joined: February 23, 2010	One option for a good radiant source (and not too expensive) is a stovetop tubular in a 120 volt version. You can buy the reflector/pan that normally sits below it in a stovetop setup to place above it to limit upward heat radiation and force most of the heat down to the coffee bed. I've done some crude experimentation using this setup and is very effective. For a 1 pound load you will only need 800-1000 watts during the first phase of the roast. Getting the nichrome heatgun element to focus most of it's heat on the coffee might be difficult. A convection fan shouldn't be necessary unless needed to help with chaff separation. Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


Koffee Kosmo	#3 Posted on 10/16/2010 7:20 PM
Administrator Posts: 1618 Joined: December 31, 2008	With my 2 pot system it is possible to add another heat element to the underside of the beans This extra heat will be used in conjunction with the Turbo Oven and use all of its features as it is now Something like this but using a spiral type oven fan element Entry is from the side with its own power plug KK Koffee Kosmo attached the following image: I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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farmroast	#4 Posted on 10/16/2010 7:45 PM
1/2 Pounder Posts: 295 Joined: December 20, 2006	Quote Koffee Kosmo wrote: With my 2 pot system it is possible to add another heat element to the underside of the beans This extra heat will be used in conjunction with the Turbo Oven and use all of its features as it is now Something like this but using a spiral type oven fan element Entry is from the side with its own power plug KK I have the plate heater on the bottom of my Dreamroast to supplement and balance the heat. It's embedded in a plate of aluminum to spread the heat. farmroast attached the following image: Edited by farmroast on 10/16/2010 7:51 PM Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


farmroast	#5 Posted on 10/16/2010 7:55 PM
1/2 Pounder Posts: 295 Joined: December 20, 2006	Quote allenb wrote: One option for a good radiant source (and not too expensive) is a stovetop tubular in a 120 volt version. You can buy the reflector/pan that normally sits below it in a stovetop setup to place above it to limit upward heat radiation and force most of the heat down to the coffee bed. I've done some crude experimentation using this setup and is very effective. For a 1 pound load you will only need 800-1000 watts during the first phase of the roast. Getting the nichrome heatgun element to focus most of it's heat on the coffee might be difficult. A convection fan shouldn't be necessary unless needed to help with chaff separation. Allen The beans whirl around the outside walls of the roast pot on my roaster, not on the bottom as with the other TO design stir roasters, so the cylinder shaper heat gun element would have nice exposure like being in the center of a doughnut of beans. Edited by farmroast on 10/16/2010 8:11 PM Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


allenb	#6 Posted on 10/16/2010 9:16 PM
Administrator Posts: 3684 Joined: February 23, 2010	Got it. Have you ever seen these nichrome radiant heater elements by Eagle (now Cooper). I've used them before and they're pretty indestructible. Not sure where to get them these days. Unfortunately, you'd have to mount it fat side up but you could remove the medium base threaded metal piece and wire direct. Sivetz use to use them in his smaller fluidbeds. http://www.portic...heater.pdf 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


seedlings	#7 Posted on 10/17/2010 10:39 AM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	Ed, it sounds like you're not adding airflow, but adding more heat sources? Will air be flowing across the heat element, or will the high speed bean action provide air circulation? CHAD Roaster: CoffeeAir II 2# DIY air roaster Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover


farmroast	#8 Posted on 10/17/2010 7:06 PM
1/2 Pounder Posts: 295 Joined: December 20, 2006	Quote seedlings wrote: Ed, it sounds like you're not adding airflow, but adding more heat sources? Will air be flowing across the heat element, or will the high speed bean action provide air circulation? CHAD This roaster will not have a TO top, just a lid with the element/s attached to it, going down into the middle of the pot. Been pondering air flow. I was thinking that the bean action might be enough (200+rpm). Or A little fan could be mounted on the top. I want as much radiant effect on the roast as possible with good mixing. Radiant heat and roasting almost anything just seems to make the most sense. Edited by farmroast on 10/17/2010 7:19 PM Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


John Despres	#9 Posted on 10/17/2010 10:37 PM
Administrator Posts: 2221 Joined: January 09, 2008	Hmmm. 200+ RPM seems to me as though the beans will be "glued" to the sides of the pot, leaving one side of the bean facing the element and the other in contact with the pot. Will they tumble at all? I think I'm missing something. John Edited by John Despres on 10/17/2010 10:37 PM Respect the bean. John Despres Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
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farmroast	#10 Posted on 10/18/2010 8:56 AM
1/2 Pounder Posts: 295 Joined: December 20, 2006	Quote John Despres wrote: Hmmm. 200+ RPM seems to me as though the beans will be "glued" to the sides of the pot, leaving one side of the bean facing the element and the other in contact with the pot. Will they tumble at all? I think I'm missing something. John John In a typical drum roaster, high speed will glue the beans to the wall with centrifugal force. In the vertical Dreamroast pot the high speed bean bats (2.25mm) bat the beans upwards towards the side of the pot and as gravity pulls the mass downward keeps batting the mass off of the bottom, upward. This keeps the beans moving and churning, rapidly. The key to good agitation, evenness and heat transfer efficiency. Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


John Despres	#11 Posted on 10/18/2010 4:17 PM
Administrator Posts: 2221 Joined: January 09, 2008	Aye. Got it, Ed. I thought there must be some sort of agitation in there, but missed it, I guess. After everything I've seen you post here and elsewhere, I was certain you had it figured out, but needed to ask. Thanks for clarifying. I'm looking forward to progress reports. Another question: As the beans fall back to the bottom to begin their journey up again, is there any concern about the beans touching the heat element? Is the pot big enough to to avoid contact or would the contact be so short, it wouldn't matter? John Respect the bean. John Despres Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
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seedlings	#12 Posted on 10/18/2010 6:24 PM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	Ditto John's 'another question'. In my mind you'll need airflow, but I'm sure you've conceptualized far beyond what I'm considering. Excited to see this one take shape. CHAD Edited by seedlings on 10/18/2010 6:24 PM Roaster: CoffeeAir II 2# DIY air roaster Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover


Sanvito	#13 Posted on 10/18/2010 6:31 PM
Newbie Posts: 5 Joined: October 18, 2010	I am new at this forum, I really enjoyed reading it
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John Despres	#14 Posted on 10/18/2010 7:13 PM
Administrator Posts: 2221 Joined: January 09, 2008	Hiya! Welcome Sanvito! This is indeed a fun place. John Respect the bean. John Despres Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
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farmroast	#15 Posted on 10/18/2010 7:19 PM
1/2 Pounder Posts: 295 Joined: December 20, 2006	The beans or chaff rarely get near the middle but plan on putting a cylinder of SS screen around it. I'm looking at elements from Master Appliance guns. There is a model heat gun that looks like a hair dryer and one the call a heat blower that might be a little larger in diameter. I cant find dimensions of the elements listed anywhere. The gun element seems to be mounted on ceramic where the blower one appears to be mica based. farmroast attached the following image: Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


farmroast	#16 Posted on 10/18/2010 7:20 PM
1/2 Pounder Posts: 295 Joined: December 20, 2006	The one above was the ceramic and this is the heat blower one Anyone have a Master heat gun that could give me the size of the element? fyi The heat blower model looks like this http://www.master...sflow.html Probably not enough blower push to be considered for a fluid bed homebuilt of much size farmroast attached the following image: Edited by farmroast on 10/18/2010 7:47 PM Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


Koffee Kosmo	#17 Posted on 10/18/2010 9:52 PM
Administrator Posts: 1618 Joined: December 31, 2008	You can use a whole type cake pan that will shield the element and provide the beans with a travel track B) KK I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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seedlings	#18 Posted on 10/18/2010 10:03 PM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	The heatgun elements might be designed with airflow in mind and may fail without it. I don't know for sure, it's just a suspicion. CHAD Roaster: CoffeeAir II 2# DIY air roaster Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover


farmroast	#19 Posted on 10/18/2010 11:58 PM
1/2 Pounder Posts: 295 Joined: December 20, 2006	Quote seedlings wrote: The heatgun elements might be designed with airflow in mind and may fail without it. I don't know for sure, it's just a suspicion. CHAD that was a concern I had too. Plan on hooking it up to the variac will a kill A Watt meter. I thought to go with one of the lower temp. output element thinking this would keep the temp. down. I have a nice sized 1500w nichrome spring element but would have to find some insulating material to wrap it around. Just haven't messed with nichrome much. I may need to run a fairly long spring with low voltage to get a nice radiant ET temp. I want to do a basic test using the dreamroast and just try a different lid with the element fastened to it. If it could spread 12-1500w out at a non scorching temp. I'd progress with it. It might want a different pot diameter or height. I've got a 4" wall of beans in a 12"diam. pot that seems could be evenly hit with radiant from a center cylinder shaped element. But I've got no idea if this can work. Edited by farmroast on 10/19/2010 12:35 AM Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


Dan	#20 Posted on 10/19/2010 6:03 AM
1 1/2 Pounder Posts: 1662 Joined: October 24, 2005	I own a Master heat gun and a heat blower. The elements for the heat blower are larger. They are about 2.5" in diameter and 5" long, and come in two voltages. I used a 220V unit as a heat source for the drying portion of a mechanized parts washer. Lack of airflow might cause the element to 'fuse out' if the nichrome gets hot enough to melt. If you want radiant, then why not go all the way? Use a halogen lamp inside a Pyrex protective cylinder.
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farmroast	#21 Posted on 10/19/2010 9:13 AM
1/2 Pounder Posts: 295 Joined: December 20, 2006	Quote Dan wrote: I own a Master heat gun and a heat blower. The elements for the heat blower are larger. They are about 2.5" in diameter and 5" long, and come in two voltages. I used a 220V unit as a heat source for the drying portion of a mechanized parts washer. Lack of airflow might cause the element to 'fuse out' if the nichrome gets hot enough to melt. If you want radiant, then why not go all the way? Use a halogen lamp inside a Pyrex protective cylinder. thanks Dan for the measurement, Yes, I should consider the halogen too. Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


seedlings	#22 Posted on 10/19/2010 12:29 PM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	Halogen, of course. Easy, easy, easy to install, control and replace. Dan A+ CHAD Roaster: CoffeeAir II 2# DIY air roaster Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover

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