Extending the outlet of a Recoheat stove heat recovery unit
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- Опубліковано 9 вер 2024
- A lot of people ask if they can extend the outlet tube on a Recoheat to blow the heated air into other areas of the house. Until now, this hasn't been possible because the turbulent air passes heat so fast into the extension material that the output cools within the first inch or so.
We have now found a way of overcoming this, so will be able to offer additional flexibility in the setup and use of the system. #woodburner #heatexchanger #stove
I really like this technology and I'm excited to see where it goes.
Also if I were you I'd get my money back from the barbershop.
A man of scintillating taste. Not sure we can blame the barber.
It’s great that you are trying to improve👍🏽
Thanks very much for the interest. We're doing quite a lot of engineering work on it, to understand it better and look at developments. We'll be publishing results over the coming months: it's really interesting. Nice to have some practical outcomes too.
Excellent, I want heat my cottage with the stove on the deck. It would come through the wall. I cant put the ancient franklin stove I found in the house because insurance and also I have no chimney in my roof. So this pipe is ideal for capturing some of that heat to reduce heating costs inside. This is what is so great about this invention. A stove fan works well, but there's no way to duct it, and even if you did, now there's a big hole in the wall. Plus this can come out from anywhere, from under a cubpoard for instance.
Thanks very much for the interest. It wouldn't work very well - you'd only be getting 5 - 10% of the heat from the stove transferred into the house, so you'd be spending a lot on fuel you were wasting. The vast majority of the heat we're shifting is the radiant heat from the stove rising into the air flow, ad you'd obviously lose all that. I would have thought the better option would have been to put a 5kw stove with a twin wall flue going through a wall if you don't have a chimney, because you'd heat the whole house with a Recoheat on that. It's a tough one - there are so many things to balance!
This is great news as I asked this very questions back in may . Brilliant . As I've just ordered mine so looking forward to seeing it in action. Next question could you fit 2 recoheats 1 at bottom and one just above and get that second source with this new attachment to send heat into my hall this speeding the process up for the rest ot the house. Have you considered or tried this.
Hi Martin, have considered it, and Peter has tried fitting three units to his workshop and is finding good temperature from the second one with less to the third, but I wouldn't recommend it for a domestic install unless you've got really good access to it and can readily clean it. We haven't tried it for long enough and assume it will have a narrower operating conditions window in terms of heat and draught. But it will certainly work if you're putting a lot of heat up a well balanced flue and burning clean, dry fuel. Don't forget the effect of the extended blower will be much lower than the system blowing over the stove because it won't be doing the main work, of shifting the radiant heat from the stove.
Good luck. You should go on Dragon's Den 😂😂
Thanks very much. Yes, it's worth considering. Up 'til now we've not been well-established enough, but we're starting to really get going now.
@@Recoheat sitter i Sverige & tittar på er. Ni finns på UA-cam & algoritmen med gilla knappen sprider er kanal fort. Räckte jag såg första videon så var jag såld på produkten. Vad är inner röret gjort av? Är det rostfritt eller koppar med beläggning? Tänker på livslängd & hållarbarhet med intensivt eldande.
@@hessmo Röret är tillverkat av 316 rostfritt stål - samma som rökkanalen: den är tillverkad enligt EU-standarder för rökgassektioner. Tack så mycket för intresset!
Is it the same diameter..the coil and the outlet ..10 mm ?
It's 10mm external and 8mm internal - and the same all the way.
Does it matter if the Recoheat is mounted upside down? In other word coil pointing down not up?
That's how we'll fabricate them for fitting over a T. We've tested it and it works fine - in fact a couple of customers have already done it - but the flue section itself needs to be the correct way round to stop acid flowing down the outside of the flue joint, so we'll make them upside down. We're aiming to have that on sale by the end of September in 5" and 6".
What if I use a silicone tube? Heat resistant, obviously.
The air flow is too hot: you won't get resistance to a continuous ~500C temperature. I've no idea if silicone would eat heat in the same way as steel does, but haven't found a suitable material in any case. Do you know of one?
Can a small splitter be put onto the outlet to blow the hot air in 2 different directions? Such as a T piece or a Y piece ?
Sorry John - missed your question. No, because it would reduce the turbulence. The effect of the jet is to draw the radiant heat of the stove into it, which is done more efficiently because of the turbulence. As the jet is also pressurised, the heat is dispersed by the pressure equalisation with the colder areas - which you could compare to pouring water down hill. Anything that reduces this effect will be detrimental. On the other hand, that effect isn't really directional, so you don't need to split it - it already goes round corners!
Frankly, I'm shocked and disappointed by this. I like the idea behind the Recoheat system and plan to install one in my woodstove system once it is installed here next year. But as a physicist, I'm shocked by the lack of understanding how heat works. The three laws of thermodynamics and all. Forget about the turbulence of the air stream - this may affect the rate at which heat initially passes from the air stream into the pipe. But once the pipe is warmed up properly - that is, once a steady state has been achieved all the heat entering into the tube will either be ejected from the end or will pass through the walls of the pipe into the room. Heat in = heat out. It's as simple as that. If you want to maximise the heat delivered from the far end of the pipe, the only thing to worry about is insulating (i.e. lagging) the pipe itself, so that less of the heat escapes into the room through the walls of the pipe.
How is this hard to understand?
The answer MUST be - connect a well lagged pipe to output port and once the pipe itself has reached thermal equilibrium, all the "recovered" heat will be delivered out the end of the pipe. No matter how long the pipe is.
Anyone doubting this, go back and ask your school physics teacher.
Hi Michael, thanks for the engagement. Or you could ask someone who actually tests the theories empirically as well as through engineering modelling! Lagging it stops heat passing out, not passing in. We're keeping heat in the air flow, not the steel - that's the point. If it wasn't so, we wouldn't bother doing what we do. We didn't look for a problem to solve with facetious arguments - we've got plenty of problems enough!
@@Recoheat Fair enough, and I really didn't want to score points or put anyone down. However, the point about heating up the pipe is all about the steady state, once everything has reached thermal equilibrium. After that point, all heat going into the pipe will go out - either through the walls of the pipe or (as we want) in the heated air stream at the end. The longer the pipe does mean more escapes through the walls, but that's not really a bad thing - it just adds to the heat in the first room.
@@pooterist That's quite right in terms of the heat going into the room, but the effect on our system is quite dramatic because the air flow loses its turbulence which is the key to the efficient transfer of the radiant heat from the stove into that jet, as well as the stirring effect it causes. So the heat dissipation into the metal makes a big difference. It's really interesting. Thanks again for your interest and engagement.
Ya’ll should delete the video saying you can’t do this
Thanks for the interest. It's a story and a progression - sometimes backwards as well as forwards. We're happy to have people share in the process because it's a key part of what we're doing.