Jun 18, 2009 at 11:31 pm #1237196
Dennis ParkBPL Member
@dparkLocale: San Francisco Bay Area
After reading about alcohol stoves, I get the sense that pressure stoves are more efficient/hotter than chimney designs. Is this true? If so, why is that? I can only conceptualize that multiple little flames generate more heat than a single big flame.Jun 19, 2009 at 2:12 am #1509250
Rog TallblokeBPL Member
@tallblokeLocale: DON'T LOOK DOWN!!
Amount of heat produced by a stove and efficiency tend to be negatively correlated. The quicker you wan to boil your water, the more fuel the stove will use.
Alcohol stoves are much lighter than pressure stoves, but the fuel has a lower calorific value, so you carry more fuel weigh for the same amount of heat produced.
Alcohol for shorthaul trips up to 5 days, butane for longer trips seems to be the consensus of opinion, disregarding other issues like fuel availability and seasonal temperature.Jun 19, 2009 at 3:32 am #1509254
@rcaffinLocale: Wollemi & Kosciusko NPs, Europe
I am not sure what you mean by either of the terms you have used – pressure and chimney. Please explain?
CheersJun 19, 2009 at 6:42 am #1509270
Tim MarshallBPL Member
This will help explain the terms used.
I like chimney stoves as they are easier to make and fill and they won't blow apart no matter what (nice plus)
-TimJun 19, 2009 at 10:02 am #1509322
@ramblerLocale: On the AT in VA
Here is what Rog was referring to.
10 days worth of alcohol weigh about the same as the canisters needed for the same amount of time. (boiling 2-3 cups of water for dinner) The weight savings would be in the weight of the stoves.
For chimney vs. Pressurized alcohol stoves, I agree with Tim, the cat can stoves are about the easiest to make because they also include the pot stand in the can itself.
Other factors would be the effectiveness of the wind screen, height of the pot above the flame. I have not heard comments about the effectiveness of the different stoves, so I would not think there is much difference. Personally I am not one to be concerned if it takes three minutes or five minutes to get the water boiling. I am more interested in how long it takes for the boiling water to cool down, so that I can eat dinner!
BTW Since you are making a alcohol stove, you might as well keep going and make an easy-to-make wood stove which will also host your alcohol stove.
tarilgear.netJun 22, 2009 at 11:57 am #1509747
Kevin BeedenBPL Member
> Alcohol stoves are much lighter than pressure stoves, but the fuel has a lower calorific value
I supect Dennis is asking only about alcohol stoves
– chimney (e.g. Cat stove, or the one supplied with the Caldera Cone
– low pressure (e.g. Trangia-style open burner)
– medium pressure closed burner(Penny stove)
– high pressure closed burner (e.g. one of the ones with a screw to seal the fill port).
My experience with tests seems to suggest that the chimney stove is relatively efficient.
> Amount of heat produced by a stove and efficiency tend to be negatively correlated.
Pretty much agree with that, although it depends on the entire cooking setup of burner, pan and windshield. A fast-burning stove is only inefficient if the pan and windshield can't deliver that high heat to the pan contents.
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