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Post by keepthecoldout on Mar 25, 2015 14:04:52 GMT -8
Hello all, It's great to be part of this forum and to share ideas with like-minded people across the globev - thanks for having me! I'm trying to heat a small house in Bulgaria and am planning to build a rocket stove or a small masonry heater such as the cabin stove. I have an eco stove upstairs but a small mass heater downstairs would be the best option by far for the 250 cubic feet of space I want to heat. The problem is the mass. The cabin stove is the right size but I do like the idea of a rocket stove. Can I build the mass in around the horizontal part of the burn chamber and add to it by having the rest of the mass as a vertical column instead of a seat/bed/bench after the barrel as I just don't have space. I'd like to be able to heat the area for 8-12 hours: it's well insulated but I don't know how many kilos of mass (granite is plentiful) I'd need. If any of you can help I'd absolutely love to hear your suggestions and if you have links to photos, designs or videos I'd be very grateful. Thanks very much in advance
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Post by matthewwalker on Mar 25, 2015 14:39:28 GMT -8
Any cooking needs or just heat?
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Post by keepthecoldout on Mar 26, 2015 23:51:10 GMT -8
Purely heating Matthew - thanks for asking:)
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Post by DCish on Mar 27, 2015 7:33:28 GMT -8
The standard masonry stove is built vertically. Rockets have typically had the mass horizontal to facilitate: 1) the weight is spread out, so no need for an expensive reinforced foundation to bear the weight focused on one spot, and 2) heating by conduction (sitting on the warm mass). That said, there is nothing about the function of a rocket that would prevent one from building vertical mass, the rocket would function just fine.
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Post by keepthecoldout on Mar 27, 2015 8:42:33 GMT -8
Please excuse my lack of knowledge here but as the heat leaves the thermal mass of a rocket stove does it heat the room?
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stoker
Junior Member
Posts: 61
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Post by stoker on Mar 27, 2015 14:06:55 GMT -8
Short answer: mostly.
Longer answer: it depends on what is around the mass, in all directions.
Consider the surface of the hot mass. The part of the surface that is in the room will transfer heat to the room.
If the mass is built against an outside wall, then heat will pass by conduction from the mass into the wall and thence to the outside of the house.
Heat will pass by conduction from the mass downward to whatever supports the mass. This might mean heat going into the ground and away from the house.
In all cases, the rate of flow of heat through the surface is approximately proportional to temperature-difference multiplied by area and divided by insulation value.
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