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| Thread ID: 124583 | 2012-05-05 04:44:00 | Break Out Your Slide Rule ------ A Brain Teaser To Which I Have No Answer | SurferJoe46 (51) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1273679 | 2012-05-05 04:44:00 | Just got back from putting the woodstove on 'full-damp', almost totally closing the air supply to it to keep it glowing hot with embers all night until morning --------- and I got to thinking . Does extracting heat from the secondary jacket around the firebox cause the wood to be consumed faster that just letting the heat naturally flow from the stove walls into the room? This particular stove has an outer jacket that has a blower forcing air from the room, through it to heat it and then discharges it out through louvers into the house . If I don't turn the heat exchange blower ON - will the wood last longer? . googleusercontent . com/-wueL7YwImPY/T6Sf3vjMwBI/AAAAAAAAKEs/dygoKo4ANQs/s640/101_0049 . JPG" target="_blank">lh3 . googleusercontent . com |
SurferJoe46 (51) | ||
| 1273680 | 2012-05-05 05:04:00 | You have to ask yourself.."does the burning wood know what is happening outside of the combustion chamber ? Does the wood feel and have a brain ?" :) | Terry Porritt (14) | ||
| 1273681 | 2012-05-05 05:10:00 | I'm thinking that sucking heat (energy) out of it would speed up the consumption. I would think a fire would have to maintain a certain level of heat to stay lit - right? Maybe I need medication - but if you are more actively pulling heat from a firebox, it has to create some sort of shift in the Time-Space Continuum. The inner walls being washed with relatively cooler air has to account for something. |
SurferJoe46 (51) | ||
| 1273682 | 2012-05-05 05:38:00 | This sounds something like what caused new rules over here about wetbacks (not YOUR sort of wetback). If you cool the combustion chamber too much, the burning effiency goes down. www.mfe.govt.nz |
decibel (11645) | ||
| 1273683 | 2012-05-05 06:00:00 | Well more air makes a fire burn faster, so less air would cause it to die down. | pctek (84) | ||
| 1273684 | 2012-05-05 06:26:00 | This sounds something like what caused new rules over here about wetbacks (not YOUR sort of wetback). If you cool the combustion chamber too much, the burning effiency goes down. www.mfe.govt.nz OK --- now we're cooking! I got a feeling that I've discovered the 11th Law of Thermodynamics here. I don't know what the others are numbered, but I hope I left enough space for them by numbering mine #11. |
SurferJoe46 (51) | ||
| 1273685 | 2012-05-05 06:29:00 | Well more air makes a fire burn faster, so less air would cause it to die down. Uh huh - I buy that 100%. I wuz just wondering if taking heat away from the jacket surrounding the firebox speeds it all up. BTW: the way we damp the fire here is not with a flapper in the exhaust - but we limit the air intake to the combustion area. I know that cokes up the flue faster, but a handful of tri-sodium phosphate (TSP) tossed into the flames cleans it well. |
SurferJoe46 (51) | ||
| 1273686 | 2012-05-05 08:36:00 | Yeah, a cooler fire will burn less efficiently. The other factor is the draw of air through the fire and up the chimney. This relies on a temperature gradient. The hotter (lighter) air wanting to rise up the chimney, and consequently drawing more cool air into the fire, past the damper. IF the fire gets too cold the draw may suffer, and the fire could stall and effectively die from a lack of oxygen. However, a strong draw also draws away all that precious heat which goes blasting out the top of the chimney. The slower the trip up the chimney, the more heat can be released to the house... there's a delicate balance (who knows where) where the combustion is effcient, but thr draw is slow enough to give the heat to the house, but not so slow that the fire dies. Taking heat from the jacket will allow the fire to pass more heat to the jacket, rather than going up the flue, but runs the risk of sapping the draw and killing the fire. If the jacket is left hot a greater proportion of the heat will go up the chimney instead. Colder jacket = colder flue gases as well. Cloder flue=less draw. Less draw=slower fire, but also less heat vented to outside. Sod all help probably... just more factors to confuse the issue.:stare: |
Paul.Cov (425) | ||
| 1273687 | 2012-05-05 09:06:00 | Get a shot of Vegemite in you and it will all become clear in an instant. (You won't need the fire either, the Vegemite glow will warm all your family.) ;) | R2x1 (4628) | ||
| 1273688 | 2012-05-05 09:21:00 | Crumbs.... it's been years and years since I had an enclosed wood burner. Wish i could remember, sorry! | Greg (193) | ||
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