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Discussion Starter #1
I have an idea to introduce a Venturi Pipe to the tent stove.
It will creat negative pressue inside the stove.
This way it will suck smoke out of the tent instead of leak into tent
I just made first prototype and tested it.
It is good as supposed.
8 pieces of AA alkaline battery can drive a 12vDC blower for full night.
the blower can be also driven by li-ion battery power bank, the later can be charged by 10W solar panel.
Anyway it is MORE safer, free of Co hazardous gases.
But there is not any same kind of tent stove in the market.
Is the Venturi Pipe necessary or not.
Attached is the first prototype.
NO commercial model is available.
So please do not make it an ad.
I just need your feedback.







 

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As far as there being no other similar stoves on the market, I can tell you I've used a bunch.
Check out www.kifaru.net
Patrick Smith has been building them for 30 years and got a few great designs. I've asked him about the blower and he's tried them, just not ever been worth the weight. He is building them for backpack hunting and weight is a key consideration. I've never been smoked out of a tent and have stayed warm and cozy more nights than I can remember based on a woodburning lightweight stove.
Heck, my first child was conceived at 10k feet, January 1st 2010 in about 6 feet of snow because of that stove! No way it would have happened without the wood stove.
 

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Misspellingintothefuture!
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The drawing helps.
I assume the stove pipe would go through the tent wall like other stoves?
Also, have you seen stove designs for houses, where the fresh air supply comes directly from outside? Basically there is just a pipe running through the wall strait into the stove, that way you do not burn up any of your warm air inside the house, these stoves are super efficient, wonder if your system could incorporate that.

Does seem like your blower concept could really help with the smoke backing up into the tent problem, my stove draws great once it heats up just a little, but eliminating the initial smoke back up I often get could be really sweet!
 

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Misspellingintothefuture!
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Heck, my first child was conceived at 10k feet, January 1st 2010 in about 6 feet of snow because of that stove! No way it would have happened without the wood stove.[/QUOTE]

Just please do not tell him about his conception.
My dad did that to me, and i'm kinda scarred, will never look at a pick nick table the same way again!! :eek:
 

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Discussion Starter #6
As far as there being no other similar stoves on the market, I can tell you I've used a bunch.
Check out www.kifaru.net
Patrick Smith has been building them for 30 years and got a few great designs. I've asked him about the blower and he's tried them, just not ever been worth the weight. He is building them for backpack hunting and weight is a key consideration. I've never been smoked out of a tent and have stayed warm and cozy more nights than I can remember based on a woodburning lightweight stove.
Heck, my first child was conceived at 10k feet, January 1st 2010 in about 6 feet of snow because of that stove! No way it would have happened without the wood stove.
10 Watt solar panel, Li-Ion battery power bank, adapter, blower, total weight is some 1.5 lbs. A PORTABLE stove shall be 20 to 30 lbs. extra weight shall not be a problem
 

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Discussion Starter #7
The drawing helps.
I assume the stove pipe would go through the tent wall like other stoves?
Also, have you seen stove designs for houses, where the fresh air supply comes directly from outside? Basically there is just a pipe running through the wall strait into the stove, that way you do not burn up any of your warm air inside the house, these stoves are super efficient, wonder if your system could incorporate that.

Does seem like your blower concept could really help with the smoke backing up into the tent problem, my stove draws great once it heats up just a little, but eliminating the initial smoke back up I often get could be really sweet!
To add an extra pipe to go through wall, and supply fresh air from outside shall be much easy technically. But extra weight and volume is a big concern.
If main air supply is from inside, but second air is introduced from outside, it is meanless.
 

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Discussion Starter #8
this is the battery box.
8 pieces of AA battery can drive the 12VDC blower for up to 10 hours.
I am sure you know the weight of battery.



Following are 2 pieces of solar panel. total 10Watt. each size 7"x9“ as long as sunshine day it works great either summer or winter.
But rain/snow day will kill it
 

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Discussion Starter #9
The drawing helps.
I assume the stove pipe would go through the tent wall like other stoves?
Also, have you seen stove designs for houses, where the fresh air supply comes directly from outside? Basically there is just a pipe running through the wall strait into the stove, that way you do not burn up any of your warm air inside the house, these stoves are super efficient, wonder if your system could incorporate that.

Does seem like your blower concept could really help with the smoke backing up into the tent problem, my stove draws great once it heats up just a little, but eliminating the initial smoke back up I often get could be really sweet!
SUCTING by chimney is caused by heat or temperature difference top and bottom. When you light your stove there is no temperature difference inside the chimney. Naturally there is no sucking force to draw smoke out. Also during later night, if wood is almost burnt out to leave a few pieces of red charcoal, the heat or temperature it produces is not enough to form a natural draft, but the red charcoal may still produce Co. It is a big risk. Not a few were killed by Co is nothing but you have to keep your tent leakage somewhat. The price you pay for Co safety is colder tent than it shall be otherwise.
THIS IS MY IMAGINARY. truth or false to be discussed.
 

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Misspellingintothefuture!
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Ya, I know, but on the outside air point, it would have to be make up air from inside AND outside, going through your blower, bit more complicated, but thought i'd throw the idea out there while you are thinking about stove design. I do see value in your idea.
 

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I've used a lot of wood stoves and never had a smoke problem that couldn't be figured out. Light a piece of paper inside the stove and you've heated the chimney enough to get a good draft when lighting the fire. Open the door slowly when adding wood and that's it. If you have that much of a problem its just a poorly designed stove, then I suppose a blower would help.

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^true enough. Don't usually have that problem here but when I was in the PNW you could buy kiln dried firewood and STILL not get it to burn if it was humid enough.

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Discussion Starter #14
why I introduce negative power draft by venturi pipe.
I watched youtube for a most popular wood stove, the most cheap and best seller on eBay. Sorry I can not mention its name or give the link. But it is easy to search on youtube or eBay.
I can find clearly the smoke leaks out from door.
Then I ask myself can I do something.
Finally I make this blower setup and test it on a regular stove.
If most of you do not have smoke tent problem, this blower setup is not necessary.
 

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This is a weird thread. Never had a problem with my Knico packer wood stove and wall tent. People been using packer/sheep herder stoves in tents for well over 100 years and the overall design has changed little, likely because there isn't a problem. Maybe they do things a little different in Beijing?
 

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Discussion Starter #16
It seems this post goes to wrong way.
Let us focus on the tent stove only.

In the past you can not add a blower due to size and weight of blower and power.
Now a small 12 VDC 10CFM blower is good enough,and weight is only 120 gram, say same weight as 2 pieces of chicken egg.
Now 4 pieces of li-ion battery power bank is just 250 gram. Same capacity Lead acid battery as in your car must be 10 times heavier.
10 Watt solar panel is around 500 gram. Same capacity gasoline generator must be ten times heavier. nothing to say you have to bring gasoline with you to the high mountain.
You did not own something because it was beyond your ability.
Science & technology has made life safer and easier.
Why refuse.
 

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Discussion Starter #18
Cited from WinterTrekking.com - Hot Tent Safety

Hot tents cannot be air tight or the stove will use up all the oxygen, and when the stove is cooling down as you sleep, it would leak carbon monoxide. To prevent this, hot tents are designed deliberately to not be air tight. Doors are flaps where they can be closed but the stove can draw all the air it needs through the flap. Or doors with zippers are never zipped completely shut and left open at the bottom for an unimpaired draw of outside air.
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Comment by tentstovenerd:
Yes you can leave your tent open to get rid of risk of carbon monoxide
But if you can suck the
carbon monoxide out of stove through chimney directly, it will be SAFER.
Why let a lion sleep beside you even there is a guard beside.
It is SAFER to lock the lion in a cage. Especially when you have a cheap & strong cage.
 

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Discussion Starter #19
Hmm. Something keeps telling me this is a fake user name of somebody trying to fuck with us.
Can we seriously discuss the stove only.
I may be wrong.
That is the reason why I post here to hear different voice.
But you are not discussing STOVE.
 

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My $.02.

The fan will cause the tent to be colder. When a stove is burning, it only draws in the combustion air it needs to burn. As the fire cools, the draw is reduced until the stove no longer needs air.

With a fan blowing air up the stove pipe, it is drawing extra cold air into the tent. When the stove is hot and burning well it blows the air faster out the chimney, creating a draw in the fire box. This will cause the fire to burn faster, creating a need for more wood. It causes the air temperature inside the tent to be colder, due to the extra air coming from outside. As the stove cools, the fan cools it much faster. The residual heat of the stove is blown out the stove pipe, instead of heating the interior of the tent. Once the stove has cooled, the fan continues to blow air out the chimney until the interior temperature matches the exterior temperature.

IMHO, there is an extremely low level of risk due to CO with a regular wood stove. Tents are not air tight. Hot air rises, taking the CO with it. It takes very little heat to cause the air/CO to rise.

I can not imagine a scenario where a fan would be better.
 
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