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Post by daniel on Jan 21, 2016 13:58:55 GMT -8
The footprint would be 33cm X 100cm, pretty narrow but, the entry and the exit is along the line that unites the dot from the chimney to the dots inside the bell. There is about 10 cm height difference between them. I feel that I could store more heat somewhere, (I could raise it another row, make it thicker, put a dead bench or make a heat exchanger above the bell to transport the hot air to another bell)?
..... CHIMNEY . . . ..... ........ BELL . . . FRONT . . . ........
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Post by daniel on Jan 21, 2016 14:01:45 GMT -8
My dots drawing did not come out well after I post it. It was showing a smaller square above the rectangular bell to the right.
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Post by peterberg on Jan 22, 2016 5:31:28 GMT -8
The height difference looks rather cramped I'd say. Unless you mean the upper part of the exhaust opening is 10 cm apart from the lowest part of the inlet opening. That would be just enough to create a bell situation, the footprint looks like it's OK as long as these are the internal measurements. And of course it helps when the openings are as far apart as possible i.e. diagonally opposite.
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Post by daniel on Jan 22, 2016 11:53:43 GMT -8
Yes is pretty cramped, these being the outside measurements. Inside the bell would be 20cmX100cm. If I add a deflecting flap in the middle between the inlet and the outlet it would perhaps send some heat upwards. However I am worried that doing that it would slow the gases and reduce draft. If I could extract more heat without affecting the draft. I thought of adding more mass or a heat exchanger to blow hot air through insulated pipes to another bell, I wold preffer air rather than water because of the simplicity of the installation. Do you think these remote bells would heat up. It would only take a 12v electric fan.
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Post by peterberg on Jan 22, 2016 12:39:10 GMT -8
Don't like fans to distribute warm air. By forcing the air to rapid movement it will cool off. Where should that remote bell be situated?
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Post by daniel on Jan 22, 2016 13:46:47 GMT -8
In another room about 5m from the bell at the same level and/or once I open up the current area heated by the bell will double in size and then one bell might not be able to heat the whole space.
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Post by peterberg on Jan 23, 2016 1:59:52 GMT -8
What I am missing here is the temperature inside of the chimney stack. This will be a sign whether or not a second bell can be added. Since this second one is 5 m away, you need an insulated channel with the least mass possible from the first to the second.
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Post by daniel on Jan 23, 2016 2:46:13 GMT -8
I will try to measure the chimney temperature. Could the heat to the remote bell be transfered with a low speed fan or other way?
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Post by daniel on Jan 24, 2016 6:20:53 GMT -8
The reading I got at 1.6m above the chimney inlet was 43 degrees C . I inserted a thermometer with a long probe used for photo but it could be a few degrees off.
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Post by peterberg on Jan 24, 2016 7:56:28 GMT -8
That's it then, in my opinion 43 C is already too low for good running of a batch box system 70 C is more like it, no second bell possible.
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Post by daniel on Jan 24, 2016 10:18:34 GMT -8
Thank you, this was an adjustable dial thermometer but seems to indicate the room temperatures ok. What would be the minimum chimney temperature at 1m or 1.6m high for the draft to work in these types of heaters?
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Post by peterberg on Jan 24, 2016 13:10:29 GMT -8
What I said, 70 C, but this depends heavily on the type and length of the chimney. My old one was 10 long and uninsulated masonry albeit inside the house and sported a small but stable draw. My new one is only 5 m long and straight up, heavily insulated but for the largest part outside the house. The draw of the latter isn't that good, as a result of that I need at least 90 C in order to have the batch box roaring.
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Post by daniel on Jan 24, 2016 13:57:44 GMT -8
Thank you, that clarifies it, I still need to insulate the top of the heater which I didn't
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