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Post by manfromdownunder on Feb 20, 2022 14:57:15 GMT -8
Hello folks,
I'm building my first batch box and I'm wanting to use it to heat water. Would really appreciate some feedback on this concept.
The plan is to cut the top off a 45kg (99pounds) gas bottle and place it over the riser tube, then wrap copper pipe around the gas bottle and insulate it all with aircrete. They'll be a final exhaust port cut into the bottom of the gas bottle so that the heat remains at the top of bottle and heats up the copper pipes, while burning off as much smoke and gases as possible before finding it's way out of the final exhaust which is at the bottom of the gas bottle (similar to porting into a 44 gallon drum before exhausting to the outside).
My questions are;
Am I on the right track heating the copper pipes this way, or is there a better way?
Is it best to make the final exhaust pipe the same diameter as the heart riser so that the diameter of the extraction porting is the same all the way through the system? ie if the heat riser is 100mm then I'd cut a 100mm hole into the lower section of the gas bottle and add 100mm tube to that as my final exhaust.
Apologies if i've not using the correct terminology here.. I'm a total neophyte!
Thank you.
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Post by peterberg on Feb 21, 2022 12:27:52 GMT -8
Hi Manfromdownunder, welcome to the boards. I'd think you are on the right track, the pipes won't accumulate possible creosote this way. The better the metals contact each other the more heat is transferred. Keep in mind the top gap (space above the riser end) should be at least equal to the riser diameter in order to avoid restriction.
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Post by solobird on Jan 17, 2023 14:10:56 GMT -8
Was thinking about the amount of pipe needed for a certain applications: length, diameter, thickness, material. And of course, where to place it. Take the following example: 1 meter of 3 mm thick, 6 cm diameter, steel pipe, placed inside the bell where the temperature would be let's say - 550 C. Using the following calculator: www.engineeringtoolbox.com/conductive-heat-transfer-d_428.htmland using a thermal conductivity for steel of 45 W/(mK), outside area for pipe of 0.18 sq m, t1 550C , t2 70C, material thickness 0.003 m (3 mm), we get a heat transfer of 1296000 W = 1296KW. That seems like way too much, so I must be missing something. Another topic would be condensation on pipes, if or how it is avoidable. I know gadget built a copper/water extraction system, described here: donkey32.proboards.com/thread/3552/el-tornado-experimental-build-thread
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