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Post by floris on Sept 22, 2023 9:12:03 GMT -8
I'd love to know what you think: A client has a 130m3 livingspace to be heated by a Batchrocket Mass Heater and another 130m3 in spaces that are to be heated through radiators. I calculated that the loss of the spaces combined is about 4,7 kW in the coldest of days which could be compensated by burning a 180mm system 3 times a day, every 8 hours or so. So my idea is to cover half of the outer surface of the 180mm heater with flexible copper or stainless steel piping inside a bed of morter which would be covered by a thick layer of insulation. heres an image to clarify: I ran it by someone who installs heating systems but who doesnt know much about mass heaters and he thinks it could work but tht it remains to be seen how well. He would install all the safety things needed like pressure release valves and temperature safety measures, expansion vath and a pump to circulate the water directly to the radiators. Do you see any problems with this in terms of safety and functionality? thanks in advance!
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Post by gadget on Oct 9, 2023 22:08:08 GMT -8
I would say do some math and get a rough estimate but that might be tricky. From my experience with heating water, you won't get tons of heat from that setup.
You are taking a hit on slow transfer through masonry, low surface area on the heat exchanger and low temps/delta T.
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Post by treebased on Nov 11, 2023 14:54:57 GMT -8
The original radiant floor systems consisted of copper tubing embedded in the concrete slab. Many of them failed due to the movement of the concrete ripping the joints apart.
I have a grid of copper on the top plate of my bell which heats 240 gallons of water +10-15F in a single burn or about 30K BTUs. Not really significant on it's own, but working together with a solar water heating array, can make the difference in the darker parts of winter. Solar is far better than fire for heating water in my experience and has a great deal of DIY options which are durable and inexpensive. By way of comparison, my 32'x4' rooftop solar water heating collector can heat 240 gallons of water +70F in one blue sky day or about 140K BTU. Convert to kw and you get 41KW, more than the average KW to power an average home (31kw). All with off the shelf parts, no chemicals or coolant, everything accessible for maintenance, and non pressurized (safer)
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Post by skywalker on Nov 12, 2023 13:48:45 GMT -8
This might work but there room for some improvements: Make sure you press the copper tubes in some alluminium plate. In this way you will have a bigger surface area to transfer the heat from your stove to the copper pipes. Use something like this: link
This will make a huge difference. Besides that I think you won't need such a thick layer of insulation. Just 25 mm superwool will do the job. There is not much heat left on this side of the heatexchanger. All the heat has already been absorbed and transfered away from the outer wall. We've had some very good experiences with this setup. The temperature of the water will be too low to heat up some radiators. But for floor heating it's perfect. We get a steady 30-35 degrees over 24 hours by fueling to stove once a day. It's a DSR3 200 mm system. Good luck!
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