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| Thread ID: 139445 | 2015-05-03 00:08:00 | Heat transfer unit | Cicero (40) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1399902 | 2015-05-04 00:12:00 | There has been some testing of a sort reported here: www.reuk.co.uk Edit: The Valiant website does not inspire confidence when it states the fan output, it says 350 feet per minute. Usually fans are rated in volume flow not velocity. |
Terry Porritt (14) | ||
| 1399903 | 2015-05-04 00:21:00 | There has been some testing of a sort reported here: www.reuk.co.uk Edit: The Valiant website does not inspire confidence when it states the fan output, it says 350 feet per minute. Usually fans are rated in volume flow not velocity. And there I was thinking kiwi injunuity. |
Cicero (40) | ||
| 1399904 | 2015-05-04 00:39:00 | What I like about the idea is the 'getting something for nothing', ignoring purchase price. The next stage in the design would be to have a bigger thermo generator powering a tangential fan the width of the stove. http://www.devilwatt.com/ |
Terry Porritt (14) | ||
| 1399905 | 2015-05-04 01:16:00 | What I like about the idea is the 'getting something for nothing', ignoring purchase price. The next stage in the design would be to have a bigger thermo generator powering a tangential fan the width of the stove. http://www.devilwatt.com/ The point was made that you can get too much air and defeat the purpose. |
Cicero (40) | ||
| 1399906 | 2015-05-04 01:30:00 | The point was made that you can get too much air and defeat the purpose. That's true, and the combustion chamber should not be over cooled, else combustion efficiency will reduce. Still a useful amount of thermo electricity could be produced from a wood stove without over cooling it I'd have thought. |
Terry Porritt (14) | ||
| 1399907 | 2015-05-04 04:14:00 | If the fan were coloured bright orange and carried a FIRE MAY BE HOT warning, it could be justified on safety grounds alone. ;) | R2x1 (4628) | ||
| 1399908 | 2015-05-04 07:33:00 | My Valiant Premiere 4 version works well and is almost silent. But if dick and tweaks say they don't work they must not!!! Even if they do. define "works well". That's true but standard fans might move air too fast, which tends to have a cooling effect. I once installed a ducted heat transfer system into my house to move heat generated by a pot bellied stove into the hall and master bedroom. It used a large diameter 75W fan to move a largish volume of air gently, I was informed if you tried to speed up the airflow you lost more heat than you gained. Of course that's travelling several metres through an insulated duct and not just circulating in the room. The duct worked ok but only raised the temp a little in the other rooms and the lounge was still too hot, I had a theory that cutting a large vent through the adjoining wall from the lounge to the hall would have worked better. I don't recommend pot belly stoves for small spaces, they pour out way too much heat. Adding one of these things could only make that worse :) which begs the question, wood burners putting out as much heat as they do why would you need to worry about making them better. true if the air speed is fast. most fans tho have speed settings so you taylor that to the situation. but its also why you want a big fan. ceiling fan is ideal, big but moving slowly and in the ideal location. with your transfer setup, look at the return path. |
tweak'e (69) | ||
| 1399909 | 2015-05-04 07:44:00 | There has been some testing of a sort reported here: www.reuk.co.uk did you notice the testing was done in a 3mx4m room? granted in a small space a small fan is going to move air around and you would be sitting right in front of the fire. but in a normal room, especially typical kiwi open plan lounge, which will be anything from double in size and up, the small air flow will be so localized it would have next to no effect on the rest of the room. |
tweak'e (69) | ||
| 1399910 | 2015-05-04 22:24:00 | That's true, and the combustion chamber should not be over cooled, else combustion efficiency will reduce. Still a useful amount of thermo electricity could be produced from a wood stove without over cooling it I'd have thought. I might be mistaken, but isn't the fan affixed to the outside of the flue, using convective heat and not the direct heat from the the combustion process, so not cooling combustion down. |
Whenu (9358) | ||
| 1399911 | 2015-05-04 23:00:00 | I might be mistaken, but isn't the fan affixed to the outside of the flue, using convective heat and not the direct heat from the the combustion process, so not cooling combustion down. No, the base of the fan sits on the stove top. Heat is conducted to the 'hot' side of the thermopile in the fan stem, and the 'cold' side of the thermopile is cooled via the fins. The temperature difference produces electricity..the Seebeck effect. The amount of heat taken from the stove top is insignificant compared to not having the fan at all, so there would be no measurable reduction in temperature of the stove top. If the whole area of the stove top was used as part of a heat exchanger,(edit: abstracting more heat than would be the case by natural convection) and its temperature was measurably reduced, then there may well be a reduction in combustion efficiency and temperature, this could be compensated for by burning the wood more rapidly, ie opening the air control. At the end of the day, if $139 is of not much concern, then why not try this fan device, and possibly confound the pundits ? :) |
Terry Porritt (14) | ||
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