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Post by peterberg on Nov 7, 2014 12:27:05 GMT -8
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Deleted
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Post by Deleted on Nov 7, 2014 12:57:28 GMT -8
Mr Peter
He is right in rephrase my question in a new post, I apologize if I spoke on this because I thought for completeness of data entered also report the power and timing of fire
Thank you again
Best regards
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Post by Daryl on Nov 7, 2014 14:44:17 GMT -8
Off topic, I love your avatar Filwifi. Nice choice.
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Post by meatstick on Dec 17, 2014 18:47:39 GMT -8
On a 6" system the chart reads 4-5/16" for base. What are you calling the base? I see everything else labeled or easy to figure out, but that one is confusing me. Is the masonry portion of the riser undersized and then a 6" riser placed on top of that? I have build a couple rocket stoves and see a much more practical application to the batch box design. Thanks for your help.
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Post by peterberg on Dec 18, 2014 2:15:13 GMT -8
Hi Meatstick, welcome to the boards.
What is called "the base" is in in fact a base measurement, used to scale all the dimensions of the batch rocket. The base has a fixed relationship to the diameter of the riser. So it isn't the physical base of the firebox or whatever.
The riser need to be the same diameter and shape from top to bottom in order to avoid friction in the flame path which is spiralling up. One side of a square riser is used as the fictional diameter, because of the aerodynamic disadvantages of a square duct as opposed to a round one. An octagon riser is a close approximation to a circle, so those can be the same cross section area.
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Post by jliebler on Jan 6, 2015 21:22:49 GMT -8
There appears to be an error in the spreadsheet. The heat riser height for an 8" system would be 57 1/2" if the formula h=10B were used but it is shown as the same height as a 9" system.
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Post by ericvw on Jan 7, 2015 3:29:33 GMT -8
Speaking of riser height...
For a 6" the base # is about 4.3125, math shows about 44" or so from floor of firebox, right? Morticcio's build appears to have a shorter than suggested riser. What's the lower limit on height?
Eric VW
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Post by pinhead on Jan 8, 2015 6:44:13 GMT -8
There appears to be an error in the spreadsheet. The heat riser height for an 8" system would be 57 1/2" if the formula h=10B were used but it is shown as the same height as a 9" system. The attached Excel spreadsheet was correct but the first post has been fixed. |
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Post by ericvw on Jan 9, 2015 17:19:01 GMT -8
morticcio, Any hints as to the height of your riser? Maybe it's the angle of the camera.... And another thing Mister W, have you moved that heater into the house yet  ?! Eric VanDub
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
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Post by morticcio on Jan 10, 2015 9:16:47 GMT -8
Eric
Approx. 1000mm (40") - the riser in the batch box is 350mm (14") + the riser extension (as in the bit that sits on top of the cast batch box) is 650mm (26") long.
Not in the house yet - daughter got married just before Christmas so wasn't allowed any distractions! She now wants one in Italy so I can see that being built before this one!
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Post by photoman290 on Jan 10, 2015 13:05:29 GMT -8
Eric Approx. 1000mm (40") - the riser in the batch box is 350mm (14") + the riser extension (as in the bit that sits on top of the cast batch box) is 650mm (26") long. Not in the house yet - daughter got married just before Christmas so wasn't allowed any distractions! She now wants one in Italy so I can see that being built before this one! worse places to be than italy. can be cold this time of year though depending on where you are. when i was working over there near bolonia, and we needed the sort of stuff you get in B and Q i was pleasantly suprised how well stocked the local hardware shop was. |
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tk
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Post by tk on Jan 12, 2015 10:23:38 GMT -8
Hi all!!
Thank you so much for all the work and results posted. I am new and as I start my design of the mass heater in my head, I have a few questions.
1)The P channel on a 150 diam system is 54W x 16H, what is the length of the port overhang? Is there some method to figure this out or trial and error?
2)Is it possible to have a dual exhaust (mass bench on either side), say 75mm left and 75mm right of the stove to meet back up to a 150 exhaust up a chimney? or would I want 150mm both sides to not restrict flow?
This is all very new to me and I can't wait to create a working rocket.
Thank you again and I look forward to the point when I can have a real discussion with all of you.
Todd
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Post by pinhead on Jan 12, 2015 10:41:17 GMT -8
1)The P channel on a 150 diam system is 54W x 16H, what is the length of the port overhang? Is there some method to figure this out or trial and error? The overhang is the same dimension as the "height" of the P-channel. The spreadsheets have been modified to include this dimension. |
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Post by ericvw on Jan 12, 2015 20:31:41 GMT -8
Thanks Morticcio,
Congratulations on the marriage of your daughter. Neat that u might be building a rocket in Italy for her!
Regards,
Eric VW
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Post by satamax on Feb 1, 2015 1:44:45 GMT -8
Hi everybody. Peter, if you happen to pop around. I'm thinking or recycling this one into a heater donkey32.proboards.com/thread/799/barbie-core-horizThe firebox internal dimensions are 30cm wide 30cm high and 50cm deep. When a 18cm riser calls for 26 wide 39 high, and 52 deep. I was wondering if it was Worth narrowing the firebox. Since it's ceilling is lower. CSA of the firebox is 900cm² while the 26x39 makes out for a 1014cm². Pretty close. Air speed in my firebox should be a smidge faster. But when burning fully, i have a bit more wood surface exposed. So more unburned gases. I know that as a barbie core, exept when fully hot, it was smoking. But my riser is only in the 80cm range, while it needs to be about 130cm. I can always make another firebox. But for the moment, i'd rather not.  What do you say? It would have door, P channel. I barrel on top. Followed by bells. Thanks. Max. |
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