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Most efficient alcohol stove?

Posted: Fri Oct 17, 2008 5:25 pm
by DHTCAMUS
Newbie here, and I have a question that I think someone much more knowledgable than me would be able to answer. What do you consider to be the most efficient alcohol stove? This is with reguards to the amount of fuel used - water boiled. Also, do you feel that an alcohol stove that uses vaporized jets is more efficient than an open flame from a burning wick? I look forward to hearing your responses. Thank you.

Re: Most efficient alcohol stove?

Posted: Fri Oct 17, 2008 6:08 pm
by zelph
DHTCAMUS wrote:Newbie here, and I have a question that I think someone much more knowledgable than me would be able to answer. What do you consider to be the most efficient alcohol stove? This is with reguards to the amount of fuel used - water boiled. Also, do you feel that an alcohol stove that uses vaporized jets is more efficient than an open flame from a burning wick? I look forward to hearing your responses. Thank you.
Glad you stopped by!!!! Welcome :D

I'm convinced that an open flame wickatized stove is more efficient than one that uses vaporized jets. A properly wicketized stove regulates the release of fuel as compared to the radical release of vapor from a jetted stove. The jetted stoves require priming(inefficient use of fuel right at the start) The WBS takes 1.75 min. of burning just to get it to bloom. Did you ever watch the video put out by sarbar of Frezzerbagcooking.com that shows the operation of the WBS? I felt as if the stove was not going to light/bloom.

Let me say here that the military Trangias are wickatized. I disected one of them and found that there is a wick that draws fuel up into the wall of the stove :D

I have not tested many alcohol stoves to be able to tell you which is the most efficient.

An efficient stove is one that will boil 2 cups of water with 1/2 ounce of denatured alcohol under optimum conditions. (70 degree starting water temp along with 70 degree air temps. Indoors, no breeze, 2.5 cup capacity aluminum pot at 5 inch diameter) These are the conditions I use when building and testing stoves. When a boil is reached under those conditions I put the stove on the board and say: This one works :D

Lots of DIY"ers make efficient stoves.

Hope you will share some of your experiences with us, nice to have you here. Lots of great folks here that know alot about stoves.

Re: Most efficient alcohol stove?

Posted: Fri Oct 17, 2008 7:01 pm
by oops56
Hi Datcamus welcome. Now the first thing to do get a snow shovel go to your work bench shovel 3 foot circle Then get a can for one quart of water to put out the run away fires and one can with bottom to put over a hi flame fire to put it out.Then when your heart stops beating fast start over have fun :lol: :lol: P S put your stoves on a cookie sheet or pie pan

Re: Most efficient alcohol stove?

Posted: Fri Oct 17, 2008 7:02 pm
by DarenN
welcome aboard!
Zelph is right about the wick-ed stoves being more fuel efficient. his Starlyte and Fancee Feest are two examples of well designed and efficient stoves. that said, wick stoves are not the fastest to boil, with some taking up to ten minutes to boil 2cups of water. not that we're in a hurry, i'm just putting out front that slower is more efficient as a general rule. a while ago i choked off a Pepsi-G with a very short potstand and got a (equivalent) 1/2oz/2cup boil.

spend some time in the Stove of the Month Club forum. some of our best stoves are there.

Daren.......

Re: Most efficient alcohol stove?

Posted: Sat Oct 18, 2008 2:08 am
by irrationalsolutions
Hi everyone. I've been reading some on this site and have watched some of the videos on youtube. I was wondering if you thought extra air flow would increase the heat of the flame on a pressurized stove.

Re: Most efficient alcohol stove?

Posted: Sat Oct 18, 2008 11:15 am
by zelph
irrationalsolutions wrote:Hi everyone. I've been reading some on this site and have watched some of the videos on youtube. I was wondering if you thought extra air flow would increase the heat of the flame on a pressurized stove.
I don't think "extra" air flow would help. Air to fuel ratio being important, to much air not good, not enough air not good. There is that "Sweet Spot" that comes into play :D

What intrigues me is the Supercat stove design. It has large holes and dumps it's BTU's pretty darn fast and my pot is capable of absorbing the BTU's to make 2 cups of water boil in 4 min. It' makes me think of how canister stoves are able to pump out the BTU's and pots are able to absorb them in short order and have 2 cups boiling in half the time. It's the ability of the pot to absorb that really gets my attention not the stoves. The term "impingement" comes to mind every time I think of flames to pot contact. Just something to think about.

Re: Most efficient alcohol stove?

Posted: Sun Oct 19, 2008 8:02 am
by DarenN
the efficiency question got me to thinking. just how efficient is boiling 2cups of water on 1/2 fluid ounce of Denatured Alcohol? some number crunching got me the answer.

(using 13,000 BTU/lb) 15ml Denatured Alcohol. 47.31% efficiency.

(using 10,000 BTU/lb) 18ml Methyl Hydrate. 54.57% efficiency.

some other numbers used.
2cups water weighs 17ounces.
start temp 70F
Boil temp 212F
DA weighs .785ounces/fluid ounce
MH weighs .738ounces/fluid ounce

Daren.........

Re: Most efficient alcohol stove?

Posted: Sun Oct 19, 2008 7:40 pm
by Skidsteer
Welcome DHTCAMUS ,

There is a pretty good Stove effeciency test available written by atraildreamer.

The Instructions can be found here:

http://www.keepandshare.com/doc/view.php?u=857757

The test form download link is:

http://www.keepandshare.com/doc/view.php?u=857758

And here's an effeciency test example of my Turbo Tea-Lite II :

http://www.keepandshare.com/doc/view.php?u=857759

Re: Most efficient alcohol stove?

Posted: Wed Oct 22, 2008 1:19 am
by grumdrig
Are those available somewhere public, Skidsteer? keepandshare wants a login that you've shared the thing with.

Re: Most efficient alcohol stove?

Posted: Wed Oct 22, 2008 8:30 am
by Skidsteer