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Post by Vortex on Apr 24, 2018 2:43:22 GMT -8
That mix would make it light. What proportions did you use, it looks quite solid. I tried some similar mixes when I was planning my last build: HERE I didn't have any waterglass but used some furnace cement instead. "Tonerdeschmelz Zement" in English is usually called Alumina Cement, Calcium Alumina Cement or Fondue Cement. Did you cast it in 4 pieces, or is there a separate back piece. And what size is the gap under your heat exchanger/hotplate? Thanks. |
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Post by madhatter on Apr 24, 2018 22:16:28 GMT -8
Ah thanks, i didn´t know the word. "Ciment Fondu" is printed on the bag. I mixed it like it was recommended for normal concrete, but with perlite instead of gravel and sand and added one third waterglass to the water. fondu.net/gb/artisans/HIGH_TEMP.htmlat first it looks like very much perlite but it mixed well when you moisten the perlite before mixing. The tricky part is the casting. You have to press it in every corner to get a solid plate. I made 3 plates for the firebox, seperate back. The upper parts were even more difficult. It helpes to add a bit more water to make the mix softer. I think a vibrating table would help a lot. The heat exchanger is 170x55x310mm. The hotplate is directly above the entry and gets very hot, abaout 350 degrees so boiling water is no problem. A mini bell instead the plate or a bell with cooking surface would also be possible to rediate more heat, but i wanted to keep it small and need hot exhaust because of the short chimney. I tested carefully with my hand. The exhaust gasses above the top of the chimney were hot but not as hot like " ahh my hand burned up within a second" 
There was no visible steam, so I think somewhere around 90..100 degrees.
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Post by Orange on Apr 25, 2018 0:51:53 GMT -8
any pics of the heat exchanger? I just see the insulated box with a hotplate.
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Post by madhatter on Apr 25, 2018 11:57:39 GMT -8
The main heat exchanger is just the last upper "box" with the hotplate on top. The insulated part is just as high as the detachable front. The whole stove gets warm and on top it gets very hot.   |
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Post by Vortex on Apr 26, 2018 4:23:36 GMT -8
If you made the box a couple of inches larger each way, then you could make it so that after going under the hotplate the gases went down the side/s, to the front and then under the base and up the back before entering the chimney.
I know you probably don't need the extra heat in a caravan, but in other situations it would improve the heat output. Likely need a little bypass for startup, but the whole thing would still be smaller than a lot of regular woodstoves, and super efficient.
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Post by madhatter on Apr 26, 2018 13:08:17 GMT -8
That is a very good idea! That would be a very compact portable stove. With a lager system and bricks in the heating pockets it would be possible to integrate some mass, too. I think a bypass would be necessary with this setup, but that would be no problem. Just a little flap from under the hotplate to the exhaust. Who wants to weld this case and try it out? I´m interested how it would perform. Peeeter? |
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serg247
Junior Member
The mountain can not be conquered, it can allow it to ascend...
Posts: 111 
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Post by serg247 on Apr 26, 2018 13:30:12 GMT -8
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