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Post by aurelie on Jan 14, 2016 8:51:12 GMT -8
Hi. I'm french, so please excuse my english skills. I'll gave the dimensions in meters, i can convert them in inch if needed, same with the temperature in Celsius I plan to heat the first floor of my house with a Rocket mass heater. I read that "8 inch is a beast" in the batch first post, so I was thinking about building a rocket of that dimension. My question is about the horizontal length for the flues: I had plan more than 10m horizontal (about 36 foot) because I want my Rocket and the start of my bench to be in the center of my room to have a better heat distribution. 36 foot horizontal and then 27 foot vertical, will it allow the rocket to start easily enough? I could have done a bypass to ease the start, but in that case I have to put the Rocket stove in one corner of the room. Rocket stove is in black in the center, I planned to go down in the dark sofa, go top in the dark sofa (so 2 tubes in that sofa to have maximum heat at the center of the room), then go right in the light blue sofa, and go down in the dark sofa to the vertical exit (already in the house) One big squae is 3.33 foot. I don't see information about the max length of the bench, even in the ianto evan book (but once again, my english comprehension is not very high). Regards.
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Post by Dan (Upstate NY, USA) on Jan 14, 2016 10:56:18 GMT -8
With 27 feet of vertical it should be no problem.
I have 30 feet with an 8 inch system with a similar 27 feet of vertical.
You will have problems "clearing" the cold air in the 27 feet of vertical when you have not used the stove in a while.
So build a "cleanout" hole in the bottom of the vertical section so you can light a small fire in there to warm it up before you start the main fire.
You could also drop down to a 6" vertical pipe with that much horizontal run, because you will cool the exhaust enough (and shrink the exhaust volume) to keep the stove drawing air up.
6" vertical pipe (whatever the Europe equivalent) is much cheaper than 8" vertical pipe. Your English is fine, I wish I could once again speak a foreign language that well, you don't use it you lose it.
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Post by aurelie on Jan 15, 2016 5:28:28 GMT -8
Thanks a lot for your answer.
My chimney is already build in my house. If it help, I'll put a tube inside the vertical part. I'll put a 6" tube for the vertical section if it help.
The interest of building a 8" rocket system is to provide enough speed to the flue in order to travell far enough? With your own system, did you have to light a starting fire in the bottom of your vertical section?
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Post by satamax on Jan 15, 2016 6:00:13 GMT -8
Hi Aurelie.
Welcome to the boards. You've got to be aware that more batch rockets have been built with bells than with tubes/flues. As far as i know. And it seems to be easier on the system. One thing i have discovered lately, is with a large system, i would preffer to have a brick bell above the heat riser, to get the first burst of the heat, then may be another bell, and finaly a metal radiator bell. Near to the flue, where the gases have cooled down. Less of a violent temp on the surface of the radiator, which would mean i could charge the bell for longer. And the mass bells would charge better with a greater temperature differential.
By the way, where are you in france? I'm in serre che.
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Post by aurelie on Jan 15, 2016 11:03:22 GMT -8
Thanks for your answer. Bells seems like a new thing, few years ago all rocket have some horizontal tubes. Things are moving fast in the rocket world. Anyway, I'll try to look for data about bells, dimension, materials, specific design, to see if it could be the way to go. Best to know that before putting the first brick. By the way I'm in a less cold place, near Bordeaux.
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Post by satamax on Jan 15, 2016 16:45:02 GMT -8
I've lived near'ish where you are now. Long time ago. In Betaille, near Bretenoux and St Céré, and In Mauzac, Near Bergerac. I vaguely know Bordeaux and Ste foix.
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Post by Dan (Upstate NY, USA) on Jan 16, 2016 6:52:46 GMT -8
I didn't have to today, the stove was warm enough and it was cold enough outside to start a fire without a small fire in the cleanout.
On warmer days, or on days when the stove is completely cold (room temperature) yes, then I have to start a fire in the cleanout to get the fire going quickly.
Last time I did that was a month ago, we had a very warm December in New York State.
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docbb
Junior Member
Back from ZA
Posts: 92
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Post by docbb on Jan 31, 2016 21:10:47 GMT -8
Ilf you want to go on a 8' system , the latest was shown here
with some ilustrations here Here you could make one long "L" bench instead of 2
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Post by mintcake on Feb 8, 2016 9:35:29 GMT -8
I've never had much success with the cleanout-fire approach. I've got a batchbox-bell-bench system rather like a one-sided version of the above, except the flu connects half way along the bench. When I built it, it was near the upper limit of the ISA for the 7" batchbox I built.... I see Peter has now reduced the ISA limits. In my opinion, that's a good thing. Or maybe I just didn't work out the ISA properly, that's possible too.
My stove is considerably more picky than I'd like: it reliably stalls when cold unless I do ALL of the following:
1. until the top of the stove has got hot, open a door (happens to be 4" square) beside the firebox so that the chimney is getting room air too. This means that the water vapour is diluted and so there's not so much fog and any fog that is formed is swept up away with the natural draft of the chimney. 2. open a bypass, until the stove-pipe is hot, so that hot gas at the top of the bench goes straight up the pipe. 3. Make sure that the door to upstairs is shut when the outside temperature is above freezing. 4. Don't think of lighting unless there's a nice natural draft up the chimney. 5. Make sure the stove next door (which shares the chimney) has all its doors shut.
David
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