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Post by briank on Dec 8, 2017 22:14:12 GMT -8
Here’s a simple idea, Alex. When Joseph was building the exhaust outlets on the floor of the primary bell, he was only going to use two passageways between the firebricks, biased towards the larger right side bench, as the total area for exhaust to exit the system into the fireplace/chimney. I convinced him to add a third so the shorter left side blind bench could also exhaust more easily.
So we have to do a mock up with firebricks how Joseph eventually did the 3 passageways between the firebricks, measure the total square inches of outlet space, and figure out how many “extra” square inches of outlet space we might have.
Then we can simply insert a piece of angle iron over these areas that lower the exit height of these passageways by the total square inches of “extra” exhaust port space we have, therefore lowering the overall height of the outlet and increasing the relative height difference between them and the benches. We may only gain 1 or 2 inches but that might make a real difference in the stratification of the gasses in the benches without making any other major changes to the structure of the whole build.
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Post by briank on Dec 8, 2017 17:14:23 GMT -8
As someone who helped build the stove I should correct the misconception that the benches are below the exit. They are 8 inches above it. Thanks Joseph. Using a laser infrared thermometer we were able to establish today that the benches were indeed warming up slowly. I had originally drawn the plans with 24” tall benches and then the firebrick cap stones, but the consensus was to make them shorter for more comfort in sitting.
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Post by briank on Dec 8, 2017 7:29:29 GMT -8
Looks good so far, the horizontal feed of the secondary air supply could be bigger, maybe even twice as big. Ok, that’s something I can modify without tearing the whole stove apart and I’ll do that today.
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Post by briank on Dec 7, 2017 20:37:02 GMT -8
And here’s the 6” rocket heater self contained in one 55 gallon barrel (with 11” of the base of a second barrel as a pedestal/manifold) that I just completed for Alex. It uses Peter’s new double shoebox (top port) design, a firebox door designed for Ugly Drum Smokers, a USSC 6” barrel stove flue collar, and a clean out T in the 6” flue to use to warm up the chimney, create draw and prevent smoke back by inserting a small fire starter (or in this case we just used heavy brown paper from the refractory mortar bags.) We fired it for the first time tonight too and barrel top got to 800 degrees.
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Post by briank on Dec 7, 2017 20:21:52 GMT -8
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Post by briank on Dec 7, 2017 20:13:46 GMT -8
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Post by briank on Dec 6, 2017 17:46:33 GMT -8
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Post by briank on Dec 1, 2017 21:30:16 GMT -8
The entire 6” rocket batch box heater will fit completely in one upright 55 gallon drum. The bottom third of a second drum sits underneath the main barrel and serves as both a pedesatal and a manifold for the barrel rocket above it.
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Post by briank on Dec 1, 2017 21:18:52 GMT -8
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Post by briank on Nov 30, 2017 14:58:11 GMT -8
I’m helping someone build an 8” system, and he really wanted to be able to see the fire. About 2 years ago I picked up an old USSC wood stove off Craigslist for $45. I took the cast iron wood stove door off that stove earlier this week and cut the center square 7” out with an angle grinder to mount door glass in it. I have an extra 8”x8.5” piece of wood stove door glass I got for free because it was cut crooked and it’s actually going to fit. I used 1/4” carbon felt from a welders blanket for a gasket, and the glass floats freely in the carbon felt with no metal contact. It’s going to work nicely in his 8” masonry system. I had to drill and tap some extra holes in the door, and make a frame to hold the glass out of stainless steel, but I have never cut cast iron before and it turned out pretty decent.
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Post by briank on Nov 29, 2017 19:33:04 GMT -8
Another possibility: 1.67” diameter marine grade 316 stainless. The tube can easily be removed from the stainless steel flange base and replaced if/when it eventually burns out. Steel tube thickness is 2mm/ 14 Gauge. (It’s simply marine grade stainless handrail tubing and hardware.)
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Post by briank on Nov 28, 2017 19:08:44 GMT -8
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Post by briank on Nov 26, 2017 10:00:53 GMT -8
8” batch box shippable core kits should be available by February.
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Post by briank on Nov 26, 2017 9:14:33 GMT -8
Shippable core kits will be available January 1, 2018! The 6” batch box shippable core kit will consist of 2/3 of the height of the left and right firebox wall, 9”, to be made from continuous 21”x9”x2 1/2” bricks of high density 2600•F insulating firebrick. It’s about 4 times stronger than regular 2300•F insulating firebrick and should withstand the loading of firewood in the firebox well. It will use regular insulating firebrick for the next 4 1/2” of the firebox walls. The rear wall will be 9” of the dense and 4 1/2” of the regular insulating fire brick. It will then use ceramic fiber board insulation for the roof. The port can be placed in a rear port, left or right sidewinder, or top (roof) port configuration. You only lose about 1/3 the insulating value of regular insulating firebrick but this denser insulating firebrick has 4x the strength and seems strong enough for the left and right hand and rear walls and the port. It will use regular dense non insulating firebrick for the floor though, as that gets the most abrasion and abuse from loading firewood. It seems a decent compromise to decrease mass and maintain insulating value for the firebox build . The upper walls and the roof maintain the highest insulation values for the rising heat inside the firebox. The floor can either be flat dense regular firebrick splits, which is the best configuration for burning the flat bottomed compressed sawdust fire brick fuel I’m using, or the traditional PVDB “V” shaped configuration. The firebox will be 9” wide, 13 1/2” tall, and 18 1/2” deep (to accommodate 4 flat firebrick splits, a sill and a 1/2” gap to the firebox door.) The kit will NOT include the heavy firebrick for lining the floor. That can be sourced locally by the purchaser. Roof can either be 1” or 2” ceramic fiber board. For a top vent, 1” might suffice, because the expansion chamber / horizontal riser will be built directly over the firebox roof. With a left or right sidewinder configuration the roof will extend over both the firebox and the expansion chamber/ horizontal riser which will be the same height as the firebox along the left or right side. The kit will include the expansion chamber / horizontal riser for all the configurations. Secondary air will still be delivered via a recess in the ceramic fiber board under the firebrick floor. I’ve sourced marine grade 316 stainless steel tubing and mounts to make it easily attachable to a piece of metal plate between the ceramic fiber board under the floor and the layer of firebrick for the floor. The expansion chamber/horizontal riser needs to maintain the highest temps so will be made of ceramic fiber board. It will be included unless the purchaser requests just the firebox. Vertical 6” square risers can easily be constructed from 24”x9”x3” regular insulating firebrick arranged in a pinwheel fashion. Four bricks will create a 24” vertical riser, six will create a 36” riser, and 8 will create a 48” vertical riser. These bricks will be available separately All of this kit will be robustly packaged to protect the fragile insulating firebrick and shipped in one box via UPS or USPS. (The ceramic fiber board for the floor and ceiling of left and right sidewinder configurations may have to be shipped in a separate box.) Assembly will be simple with easy to follow directions. Photos this week hopefully. I’m still contemplating having a vacuum formed ceramic fiber shape made that would take the place of the 4 1/2” regular insulating firebrick wall extension and ceramic fiber board roof and serve as a cap for the HD 2600 9” walls. It would further simplify creation of the firebox but cost a lot of money up front for molding fees. I’m also contemplating having one vacuum molded ceramic fiber shape for the expansion chamber / riser. At present the shippable core kit will not include these vacuum formed ceramic fiber shapes. My website is not up and runnng yet, but will be www.pennrocketheaters.com and the eBay store will be Penn Rocket Heaters. I’ll have a price within the week. I still have to sit down with multiple invoices and do the math. (Designing, building and experimenting was the easy/fun part!)
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Post by briank on Nov 26, 2017 7:59:48 GMT -8
The 6” batch box shippable core kit will consist of 2/3 of the height of the left and right firebox wall, 9”, to be made from continuous 21”x9”x2 1/2” bricks of high density 2600•F insulating firebrick. It’s about 4 times stronger than regular 2300•F insulating firebrick and should withstand the loading of firewood in the firebox well. It will use regular insulating firebrick for the next 4 1/2” of the firebox walls. The rear wall will be 9” of the dense and 4 1/2” of the regular insulating fire brick. It will then use ceramic fiber board insulation for the roof. The port can be placed in a rear port, left or right sidewinder, or top (roof) port configuration. You only lose about 1/3 the insulating value of regular insulating firebrick but this denser insulating firebrick has 4x the strength and seems strong enough for the left and right hand and rear walls and the port. It will use regular dense non insulating firebrick for the floor though, as that gets the most abrasion and abuse from loading firewood. It seems a decent compromise to decrease mass and maintain insulating value for the firebox build . The upper walls and the roof maintain the highest insulation values for the rising heat inside the firebox. The floor can either be flat dense regular firebrick splits, which is the best configuration for burning the flat bottomed compressed sawdust fire brick fuel I’m using, or the traditional PVDB “V” shaped configuration. The firebox will be 9” wide, 13 1/2” tall, and 18 1/2” deep (to accommodate 4 flat firebrick splits, a sill and a 1/2” gap to the firebox door.) The kit will NOT include the heavy firebrick for lining the floor. That can be sourced locally by the purchaser. Roof can either be 1” or 2” ceramic fiber board. For a top vent, 1” might suffice, because the expansion chamber / horizontal riser will be built directly over the firebox roof. With a left or right sidewinder configuration the roof will extend over both the firebox and the expansion chamber/ horizontal riser which will be the same height as the firebox along the left or right side. The kit will include the expansion chamber / horizontal riser for all the configurations. Secondary air will still be delivered via a recess in the ceramic fiber board under the firebrick floor. I’ve sourced marine grade 316 stainless steel tubing and mounts to make it easily attachable to a piece of metal plate between the ceramic fiber board under the floor and the layer of firebrick for the floor. The expansion chamber/horizontal riser needs to maintain the highest temps so will be made of ceramic fiber board. It will be included unless the purchaser requests just the firebox. Vertical 6” square risers can easily be constructed from 24”x9”x3” regular insulating firebrick arranged in a pinwheel fashion. Four bricks will create a 24” vertical riser, six will create a 36” riser, and 8 will create a 48” vertical riser. These bricks will be available separately All of this kit will be robustly packaged to protect the fragile insulating firebrick and shipped in one box via UPS or USPS. Assembly will be simple with easy to follow directions. Photos this week hopefully. I’m still contemplating having a vacuum formed ceramic fiber shape made that would take the place of the 4 1/2” regular insulating firebrick wall extension and ceramic fiber board roof and serve as a cap for the HD 2600 9” walls. It would further simplify creation of the firebox but cost a lot of money up front for molding fees. I’m also contemplating having one vacuum molded ceramic fiber shape for the expansion chamber / riser. At present the shippable core kit will not include these vacuum formed ceramic fiber shapes. My website is not up and runnng yet, but will be www.pennrocketheaters.com and the eBay store will be Penn Rocket Heaters. I’ll have a price with the week. I still have to sit down with multiple invoices and do the math. (Designing, building and experimenting was the easy/fun part! I’m not procrastinating, I’m just not a numbers person.) Each of these cases on the bottom row contains five 24”x9”x2 1/2” or four 24”x9”x3” insulating firebricks:
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