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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Fluidbed Roaster

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Heating elements
jake415	#1 Posted on 02/15/2022 3:54 AM
Newbie Posts: 26 Joined: January 18, 2022	Hi Homeroasters,. Any advice for attaching a heating element to the inside of a stainless steel pipes? I heard people talking about inserts, but can't find enough info to figure it out. I've been thinking of drilling in rods to hold up the thing but it isn't an elegant solution. For reference, I have a common 1600W ceramic heating element which is a hot air gun replacement part and 2" Stainless steel tube. https://www.amazo...N&th=1 Sorry if this was answered before, but I have a few more questions that I couldn't find info on: Is silicone insulation okay to connect to the heating elements or are people using nickel plated stuff? Also, Is it best to place it closer to the blower or the roasting chamber, or does it not matter? Any general advice around setting up heating element would be great. Thanks


jordo_99	#2 Posted on 02/15/2022 8:16 AM
Newbie Posts: 5 Joined: September 27, 2020	I used the actual heat gun housing in mine which is 1.5" and then just wrapped it tight with high temp insulation (mica or fiberglass...don't recall which) to fill the void between the 1.5" housing and 2" tube it sits in. The insulation is packed in there well enough that everything just stays in place.


renatoa	#3 Posted on 02/15/2022 8:47 AM
Administrator Posts: 2430 Joined: September 30, 2016	Quote jake415 wrote: I heard people talking about inserts, but can't find enough info to figure it out. Look at these cake tin patterns, image attached. Now imagine something done manually by you, having outer tips the size of tube inner diameter, and the inner tips arranged to support your heater. renatoa attached the following image:


jake415	#4 Posted on 02/20/2022 4:43 AM
Newbie Posts: 26 Joined: January 18, 2022	I tried the mica wrapping method and it worked great. I'll have to see if it effects airflow but it definitely is an easy way to install the heating element into the pipe. The star tin patterns is definitely a creative solution, good to know there are a lot of ways to figure this out. Less airflow resistance which is good. Thanks for the good ideas


exer31337	#5 Posted on 09/25/2022 10:15 PM
Newbie Posts: 30 Joined: September 12, 2022	I am confused why people don't use the 4.4KW or 6 KW etc... heating elements off of aliexpress for 1kg fluid bed roasters. Can someone tell me what I am missing? Thank you. https://www.aliex...94037.html Edited by renatoa on 09/26/2022 4:00 AM


renatoa	#6 Posted on 09/26/2022 4:00 AM
Administrator Posts: 2430 Joined: September 30, 2016	Too many choices... too little time... and money to test everything... If you know that "people don't use" these elements... what is using people actually for 1 kg FB machines ? For 1 kg maybe gas could be more economical ? Edited by renatoa on 09/27/2022 2:10 AM


exer31337	#7 Posted on 10/03/2022 1:24 PM
Newbie Posts: 30 Joined: September 12, 2022	I am sure gas is more economical I am just better at wiring than gas and I don't want a fireball to the face. I've seen people using two heating elements to get the same amount of KW as that one, so I am confused why they just don't use that one. More so wondering if I am missing something. Thanks.


allenb	#8 Posted on 10/03/2022 6:03 PM
Administrator Posts: 3627 Joined: February 23, 2010	I pulled up the heating element you linked to and it appears to be one that would work well for the task and, as you stated, prevents having to use two heaters trying to achieve the needed wattage. Many have attempted to utilize this style of heater in the lower wattage range but they have a significantly smaller diameter with corresponding small opening area. Due to this issue, they prevent being able to flow enough cfm even at very high static pressures. It appears that the 4.4 kw or higher wattage ceramic heaters don't have this shortcoming and it's great that you have posted a link to it as I've never seen this one before. 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


renatoa	#9 Posted on 10/04/2022 1:23 AM
Administrator Posts: 2430 Joined: September 30, 2016	Is 4.4kW enough for 1 Kg FB ? For smaller models the rule seems to be 1 kW for 100 grams... :confused:


allenb	#10 Posted on 10/04/2022 5:42 AM
Administrator Posts: 3627 Joined: February 23, 2010	Watts per grams ratio drops as roaster batch size capability increases. Not sure if there are any relationship charts available but would be nice to have. I have been able to roast 500 grams in a fluidbed with 2500 watts so the ratio change happens fairly quickly. 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


renatoa	#11 Posted on 10/04/2022 7:32 AM
Administrator Posts: 2430 Joined: September 30, 2016	I guess the cylinder ratio plays a role... bigger diameter favor less pressure to create the movement, thus less power consumed for both bubbling and heating.


progen	#12 Posted on 10/05/2022 4:57 AM
1/4 Pounder Posts: 60 Joined: December 17, 2019	Quote renatoa wrote: Is 4.4kW enough for 1 Kg FB ? For smaller models the rule seems to be 1 kW for 100 grams... :confused: Yes, it's enough even for a fairly inefficient heating chamber design where 70% of the air passed through the center column and the left and right columns were glowing red. That's if you don't play around with infused beans like me. I need much more power because of that.


greencardigan	#13 Posted on 10/09/2022 6:09 PM
1 1/2 Pounder Posts: 1162 Joined: November 21, 2010	I typically roast 1.2kg green in my 5.4kW (3 x 1800W heatgun elements) air roaster with a bit of power to spare. I think 1kg green with 4.4kW is probably fine with the right roast chamber design.

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