I wouldn't use sand for that application unless it's stabilized. Just enough to prevent compacting over time due to expansion and contracting caused by the thermal cycle. When used as loose material you run the risk of the walls are pushed apart by the sand.
I burned it for may be 4 hours today, while piling up thoses bricks and filling them.
And i've had dark glow!
That's for thoses who know what that purple is.
But i have a problem. The air entrained concrete slab on the left when looking at the firebox, has cracked. I might have to build a wall there. Not good! And the right hand side refractory slab cracked too. Mind you, that's far easier to cure, as it is normal and expected.
Will the air-entrained slabs last? I would use some Superwool or IFBs if available.
The purple glow is always good for melting the aluminium cases from 3.5" hard drives I have stripped down. Put them in a stainless steel balti dish, insert into firebox, cook for 20 mins, remove and pour into the frog of a London Brick to get perfect ingots :-)
Last Edit: Nov 15, 2015 15:43:23 GMT -8 by morticcio
Morticio, i was talking about the purple glow in the port!
My camera has a lousy infrared filter, as many digital do. And to me it looked dark orange. I mean, the heat riser was glowing. I've seen that few times on the green machine even the whole end of the firebox. It's a first time for this one. Never happened with the barrel one which was in place before this.
I don't know hos the air entrained concrete will fare. I thought, protected by the firebricks, it could last. But one tiny crack already, that's no good. Mind you, it's easy to replace.
Did a nice pebble and concrete lasagna on top of the second bell.
Now this is all covered with concrete. I used all the brick rubble from the build. The gravell and sand i had outside. Nothing left or nearly.
1500kg of sand, 8 bags of cement. A wheelbarrow of rubbble. Another one and a half of gravell. Three or four wheelbarrows of big stones. All the hollow bricks visible. A fair bit of old refractory bricks. Plus the dark flue elements, refractory tubes and slabs etc. A fair bit of mass i would say.
Peter, if you see this pic below.
Would you think that, when i reach this ember stage, i can close the gate at the end of the second bell, to stop the heat being wasted into the chimney?
The gate you can see at the beggining of this build. I would think i have something left, like 20% of the 25cm diameter pipe it was originaly made for. I'm trying to learn to make the most out of it.
THanks a lot and best regards.
Last Edit: Nov 17, 2015 13:50:24 GMT -8 by satamax
Max, I would say close the air inlets completely and let the coals die down on their own. That's what is being done in Austria with the eco-firebox. The next burn will be built on top of the remaining coals. Closing the damper at the end bears the risk of carbon monoxide escaping into your workspace. You should avoid that at any price.
Ok Peter. The issue is, the door being a smidge big, i did an air inlet all around; i mean i have 6 or 7mm gap between firebox at the bottom, and the door, that going to nothing on top. So, i can't realy close that
The mass on top was still warm this morning. I Wonder if the concrete released all it's moisture, but it kept warm. Mind you, i didn't have to dry the stones, and it's full of thoses
Another question, do you have a lot of ashes? I find that i have alot compared to the firebox of the green machine. Tho, that one was all doubled with IFB. I'll try to post a pohto tonight.
martinm: any one here with info \ experience with heat (from a mass heater) distribution with ducts throughout two storey house ?
Sept 8, 2018 22:58:52 GMT -8
padica: Good morning, this is a wonderful subject, please someone can help me with the theme of double and triple combustion, how it is achieved, theory and design, thank you
Sept 15, 2018 7:13:40 GMT -8
wiscojames: I'm afraid you won't get a response to such a vague question - I suggest reading through some of the threads related to your questions before asking for an explanation. People will be very generous with their knowledge if your question is more specific.
Sept 18, 2018 4:48:00 GMT -8
daniel: in my experience as I am working now on something of that nature, I have thought of making a heat exchanger and distributing the heat through vents using a slower fan. Now after a few years I realize that mass heaters give out primarily radiant heat, for
Nov 30, 2018 12:48:38 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place...
Dec 16, 2018 18:10:49 GMT -8
vesuvius: High Temperature Glass options,
Jan 4, 2019 16:28:17 GMT -8
vesuvius: Do any of you have experience with using the glass from home oven doors on a rocket stove? I'd like to have a viewing port on my stove but don't want to fork out for new ceramic glass. Any thought as to whether it would take the heat of a rocket stove?
Jan 4, 2019 16:30:40 GMT -8
yaya: you dont need the blowair for that temp..
Jan 13, 2019 16:43:57 GMT -8
flybywire: Glass window from an old washing machine is designed to take high temps. Cheap solution to your need.
Jan 27, 2019 0:10:58 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place to have a discussion... it is for short announcements
Feb 7, 2019 0:11:23 GMT -8
coastalrocketeer: you won’t likely get replies to questions here, and it is not a spot that makes holding an ongoing discussion possible...
Feb 7, 2019 0:12:22 GMT -8
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8
topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
Sept 28, 2019 6:16:25 GMT -8
anounaki: Hi, why I cant upload photos when I make new tread to this forum?
Feb 28, 2020 2:09:40 GMT -8
ahansen: photos under 1 mb not possible?
Jun 4, 2020 0:09:21 GMT -8