Compact reverse flow

[ahumadora]

Just finished tonight my new design for a compact smoker that can be shipped in box.

20" 3/16 steel. Let me know what y'all think.

 

[daveomak]

Nice... You've been busy....

 

[motocrash]

Cool! What thickness is the RF plate with the FB being directly underneath? I like to see a drawing of this one...

 

[socalcooker]

Looks great. My only question is do you get a hot spot from the firebox being completely underneath the CC?

Kyle

 

[ahumadora]

I am ahead of y'all on having a screaming hot reverse plate. Actually the reverse plate is only 1/8" thick. The firebox is a full 360* 3/16" thick, so it has 3/16 then the 1/8" RF plate that sits about 2 cm above the top of the firebox. The piece I cut out of the cook chamber to insert the firebox I re use to extend the top part of the firebox to the end of the reverse plate. I have only 1 cook under my belt on it but works great!!

 

[motocrash]

I am ahead of y'all on having a screaming hot reverse plate. Actually the reverse plate is only 1/8" thick. The firebox is a full 360* 3/16" thick, so it has 3/16 then the 1/8" RF plate that sits about 2 cm above the top of the firebox. The piece I cut out of the cook chamber to insert the firebox I re use to extend the top part of the firebox to the end of the reverse plate. I have only 1 cook under my belt on it but works great!!

So it's a SHRF!

 

[civilsmoker]

Cool design.

Can you share a pic of the rf plate? Just wondering how the drippings is managed?

 

[ahumadora]

This one was the first of the design, hence an extra horizontal weld. Now an 1/8" RF plate sits about 2 cm above this, that is removable.

 

[motocrash]

I really like this design,very compact.It's making me rethink my 100 Pound propane build.How bad it the hot spot on the FB end?

Bill

 

[ahumadora]

I have not cooked on it personally, but can't imagine it is bad. Has 3/16" for the roof of the fire box as seen above, and air gap of nearly 1" then an 1/8" plate. I am building these commercially, so went with the 1/8" plate. You could always make the RF plate thicker.

 

[motocrash]

You'd clean up selling those here in the states

 

[Rings Я Us]

Nice...
I'm not sure who you are marketing to but if they are educated on the advantage of reverse flow you have a sales advantage of sorts.

 

[civilsmoker]

Very nice. This is a very similar design as almost every pellet stove on the market in the states. I have a high-end gas stove (propane :-)) in the house and the bottom floor above the burner is a double heat shield like this as well. However, both of the above are like 16 gauge vs 10.

From a commercial stand point (no wasted material) you have a great design and product.

 

[ahumadora]

Here's another model I am building on the same principle. I can get the 20" tubes and 120 gallon propane tanks cheap. So I came up with this model. I cut the head off 1 tank and both head and bottom off the other tank and weld them together. Much easier to get an end plate plasma cut slide the RF plate in on top and weld it all together. Then weld on a square exhaust stack which is easier. This is the first one a new shop is building for me, hence the grates are a little wider than I like as I am not there atm.

This should work well in Buenos aires where space is limited in restaurantes.

 

[motocrash]

Cool,same "model" just larger.These pics show the design better.So the RF plate just needs a small air gap between it and the FB......

Bill

 

[paulr44]

Just finished tonight my new design for a compact smoker that can be shipped in box.

20" 3/16 steel. Let me know what y'all think.

Nicely done. If UPS / FedEx will take the weight, great! Yoder Cheyenne has competition!

 

[civilsmoker]

A reverse flow smoker is in essence a radiant convection oven. The metal around the grates radiates heat while the heated air & smoke flows around the item being smoked on its way to the exit. Therefore, as long as the "reverse flow plate" and the remaining chamber is properly "heated" to produce the radiant heat then it doesn't matter where the heat source is. The idea of a side fire box rather than directly underneath is because its difficult to have a fire hot enough to burn cleanly and not over heat the bottom of the oven. If you get the air gap ("insulation") between the fire box and the bottom plate set "right" to produce the uniform radiant heat then it will be very effective because the heated air has less distance (and friction) to travel.

Just for reference here is a pic of my gas convection oven. The burner is in the middle under 2 plates separated by an air gap. The air travels sideways along the "reverse" flow plate and out the side were it is deflected to cause a uniform flow across the oven area till it exits out the chimney. (Don't mind the 3/8' SS Plate we use for Pizza's and Bread).

My electric convection oven is also very similar to a RF Smoker because there is a heating ribbon around the entire oven so all "4" sides of the box produce radiant heat and then the convection fan produces "heated" air (with its own heating ribbon) that is circulated though the chamber.

 

[motocrash]

civilsmoker,welcome to SMF Forums>Smoking Supplies & Equipment>Smoker Builds>Reverse Flow

 

[civilsmoker]

civilsmoker,welcome to SMF Forums>Smoking Supplies & Equipment>Smoker Builds>Reverse Flow

:-)

This thread has got my engineer nerd on....makes me want to build an smaller version of this for camping. With its efficiency it would work really well with coals and chips. My smaller smoker works well but I think it could be improved by reducing the friction in the overall system ...this may start a new trend for smaller size smokers.

 

[motocrash]

Did not mean that in a snide or condescending manner at all.Quite the contrary...this is where we share ideas,learn and hopefully come up with something new/better and more efficient.BTW your current build is very interesting.I am anxious to see it completed and making TBS!

Bill