Cramer
Junior Member
Posts: 129
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Post by Cramer on Dec 17, 2013 19:00:23 GMT -8
I do hope I have used the quote thing correctly, I was really only after this small snippet so I guess I did not. Peter, you said "My 6 [inch] double bell system had a total volume of 25 cu feet and produced a very low output temperature. Approximately 104 F for the first 60 minutes, starting from cold." A 3X3X3 foot cube has 27 cubic feet. Is this correct? Not my calculation of cubic feet but your statement of the bell volume for a 6 inch burner. If so it is really very much the information I have been seeking. I have been armchairing the subject of rocket heaters and stoves for a couple of years now. (Armchairing is a colloquialism Peter, meaning: I have not really been building or testing just opining to myself and reading, rather like an "armchair quarterback" in American football). I know English is not your primary language so I did not want to confuse. (That being said you have a very good mastery of it most of the time). I asked the question in another thread about an abbreviation regarding surface area but after getting the answer I just could not wrap my head around the idea. Cubic feet I can deal with though so a 6 inch setup would use a bit less than 25 cubic foot of volume as the bell? Would one make the bell slightly larger using a single bell since the interior surface area (ISA) would not be including the extra surface of the division between the two bells in the double bell system? Or have I completely misunderstood?
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Dec 17, 2013 18:44:06 GMT -8
The volume I am referring to is always inside. In theory, that's correct. So, when you are calculating the total volume, first and second bell together, try to end up with a figure that is around 40 cubic feet max. My 6" double bell system had a total volume of 25 cu feet and produced a very low output temperature. Approximately 104 F for the first 60 minutes, starting from cold. Yours would be an 8" system, about 1.77 times as large as mine. The volume multiplied with 1.77 makes 44.25 cu feet. Regard that as a maximum without safety margin.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Dec 17, 2013 18:42:54 GMT -8
...When you stated the number of cubic feet the bell should contain, were you referring to inside or outside dimentions? The volume I am referring to is always inside. In theory, that's correct. So, when you are calculating the total volume, first and second bell together, try to end up with a figure that is around 40 cubic feet max. My 6" double bell system had a total volume of 25 cu feet and produced a very low output temperature. Approximately 104 F for the first 60 minutes, starting from cold. Yours would be an 8" system, about 1.77 times as large as mine. The volume multiplied with 1.77 makes 44.25 cu feet. Regard that as a maximum without safety margin.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Dec 16, 2013 14:11:31 GMT -8
Well, would you look at that! Ask and ye shall receive! Thanks fore the link to the glossary of terms!
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Dec 16, 2013 6:38:06 GMT -8
Peterburg, thank you for your informative reply. I wish there were a thread for a glossary of terms and abbreviations.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Dec 15, 2013 20:27:00 GMT -8
Okay, new here just today. A few minutes ago in fact. What the heck does the abbreviation ISA mean? Trying to learn something here but when technical abbreviations are not explained learning can be quite difficult.
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