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Stove Systems for Winter Backpacking


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Home Forums Campfire Editor’s Roundtable Stove Systems for Winter Backpacking

Viewing 18 posts - 1 through 18 (of 18 total)
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  • #3802796
    Ryan Jordan
    Admin

    @ryan

    Locale: Central Rockies

    Companion forum thread to: Stove Systems for Winter Backpacking

    Ryan discusses how you build and utilize your stove system for winter cooking and snow melting to maintain hydration.

    #3802797
    Jon Fong / Flat Cat Gear
    BPL Member

    @jonfong

    Locale: FLAT CAT GEAR

    The article is a good general coverage of stove performance in the winter.  Could you please comment on fuel consumption/volume requirements for your top picks?  For snow melting and such, I would image that pack volume starts to become significant.

    #3802812
    Roger Caffin
    BPL Member

    @rcaffin

    Locale: Wollemi & Kosciusko NPs, Europe

    fuel consumption/volume requirements
    I normally allow 30 g of propane/butane fuel per day for my wife and myself in 3-season conditions. I have had that down to 21 g/day when really, really trying (I had forgotten one canister when packing!).
    For winter condition with a remote inverted canister stove I simply double that amount: 60 g/day for the two of us. This is generous. But here in Australia we don’t have to melt snow every night, so we often come home with spare fuel. But, can not rely on that!

    It takes as much energy to melt snow from, say, -10 C to +1 C as it does to heat liquid water from near-zero to boiling point. That is why I simply double the fuel amount. A crude rule of thumb, but effective.

    As to pack volume: it is not that significant. 7 days x 30 g/day = 210 g of fuel – say one canister. Double for winter: two canisters. That extra canister is usually insignificant compared to the food volume.

    Cheers

    #3802853
    Jeff McWilliams
    BPL Member

    @jjmcwill

    Locale: Midwest

    I took an Alpinism course with American Alpine Institute last year in late July and it was led by two young guys.  They were very knowledgeable in technical climbing knowledge and skill.  Other things?  Well…

    We were talking about how much fuel to bring onto Mt Baker and water availability.  Someone asked, “What if there’s no liquid water readily available and we have to melt snow?”  Their answer was that, “It doesn’t take much more fuel to melt snow than it does to boil liquid water.”

    Hmm, someone has never heard of “Heat of fusion”.  I didn’t know the numbers but I knew instinctively, and from college physics/chemistry a long time ago, that it takes significant amount of energy to change frozen water from a solid to a liquid.  Looking up the numbers:

    1L of frozen water is 1kg.  It takes 334 kJ to change 1kg of frozen water into liquid water (at 0°C) (according to Google)

    It takes 4,180 joules to raise 1kg of water by 1°C.  So to take water from 0° to boiling (100°), it would take… 418kJ

    So:  liquid water at 0°C to boiling:  418kJ

    Frozen snow to boiling:  752kJ

    80% more energy,  i.e. 80% more fuel needed.

    I’m going back this year because I got food poisoning on day 1 and had to bail.  (They’ve giving me a significant discount to retake).  Lousy luck of mine…

     

    #3802872
    Jon Fong / Flat Cat Gear
    BPL Member

    @jonfong

    Locale: FLAT CAT GEAR

    Well, that is about double the fuel consumption to bring water to a boil.  And the same amount of fuel just to melt the snow as it is to boil.  Lets say that you normally you boil 1 liter a day and drink and wash with 2 liters per day.  That’s 4x the amount of fuel that you would normally take on a trip.  It all adds up.  My 2 cents.

    #3802875
    Jeff McWilliams
    BPL Member

    @jjmcwill

    Locale: Midwest

    Jon,

    Absolutely!  It gives me new appreciation for when we’d use the MSR Whisperlite stoves and carry a big bottle of white gas.  Sometimes you really do need it if you’re melting a lot of snow.  It’s just too bad the stoves themselves are heavy.

    #3802892
    nunatak
    BPL Member

    @roamer

    Jeff, we’ve been toying with hooking up a small isobutane burner head to a Whisperlite bottle and delivery tube/jet, using white gas. Not finished yet but it seems powerful, and def will be lighter when done.

    View post on imgur.com

    My impetus is that some pots I use are too small for the regular Whisperlite’s large burner circle.

    #3802893
    Jeff McWilliams
    BPL Member

    @jjmcwill

    Locale: Midwest

    Pretty interesting!

    #3802894
    Jon Fong / Flat Cat Gear
    BPL Member

    @jonfong

    Locale: FLAT CAT GEAR

    What do you do to preheat the fuel?  Just curious.

    #3802905
    nunatak
    BPL Member

    @roamer

    So far fuel pools inside the yellow aluminum block when one opens up the valve. The eventual base will have a cup or maybe just a fiberglass mat, as the stove is so small it preheats readily.

    We also think that maybe it is rigid enough as shown and all we need, in addition to the primer mat, is a windscreen with spoke potholders, like this bigger Toaks and Firefly combo:

    View post on imgur.com

    View post on imgur.com

    #3802926
    Bill Budney
    BPL Member

    @billb

    Locale: Central NYS

    Great idea to use a lighter-weight burner with white gas.

    Dumb Question Department: What happens when you burn white gas in a spirit burner (alcohol stove)?

    Do you get the synergy of energy-dense fuel with a simple and light stove, or do you get a big fireball that doesn’t last long enough to boil water?

    Does it change if you add a mantle or wick? (Or does that just make it explode-y?)

    (I could try it, but I figure someone already has. )

    #3802927
    Jon Fong / Flat Cat Gear
    BPL Member

    @jonfong

    Locale: FLAT CAT GEAR

    Dumb Question Department: What happens when you burn white gas in a spirit burner (alcohol stove)?

    You create very yellow, sooty flames.  You have to design a passive stove specifically to burn White Gas.  I made one before and it burned a blue flame.  That being said, while the energy density is high, the actual burn rate was low.  It took about 12 minutes to boil 2 cups.  At the end of the day, it did not seem like there was enough of an advanatge to develop it further.  My 2 cents.

    #3802929
    Bill Budney
    BPL Member

    @billb

    Locale: Central NYS

    Oh, that sounds just tempting enough to make me want to try it! Perhaps a vortex-style burner, with a larger radius for more output? I’m sure you know more about it than I do, Jon. It’s my naïveté that makes the idea sound more tempting than it probably is in reality. I mean, if it really could work, then somebody would probably already be selling it.

    I just like the idea of a lightweight stove burning energy-dense fuel (assuming that we can work out the details).

    #3803796
    Naomi B
    BPL Member

    @naomibro

    Locale: Richmond

    Altitude must be factored into equation. Oxygen for flames and stoves differs at sea level versus 3600 meters or about 12,000 feet.

    #3803799
    Jon Fong / Flat Cat Gear
    BPL Member

    @jonfong

    Locale: FLAT CAT GEAR

    Altitude must be factored into equation.

    Curious, why do you think that this is true?

     

    #3803821
    Bill Budney
    BPL Member

    @billb

    Locale: Central NYS

    After further investigation, I see that white-gas-in-a-passive-stove has been discussed at length in the past:

    Why Isn’t There an UL Alcohol Stove That Burns White Gas?

    A simple alcohol stove more fuel effecient than the Jim Wood Super Cat?

    Takeaways:

    • It can be done fairly easily: Zelph demonstrates it, Dan Y states decent efficiency. (Newbie Question: Are they the same person?)
    • Benefits over alcohol are… meh. Overall, alcohol is cleaner and nicer to work with.
    • I now understand Jon’s bottom line better (above). The efficiency advantage of white gas is mitigated by an unpressurized stove.
    • I also see why Nunatak is doing it the hard way: It may work better in the end.

     

    #3803823
    Jerry Adams
    BPL Member

    @retiredjerry

    Locale: Oregon and Washington

    alcohol has about half the energy density as white gas, butane, propane, and wax

    you have to burn twice as much to generate the same heat

    but since the stove weighs so little, the total weight is less

    a white gas stove requires a pressurized container, pump, stove which weighs a lot

    #3803837
    Adrian Griffin
    BPL Member

    @desolationman

    Locale: Sacramento

    Nunatuk, prime the stove with alcohol. When I cooked with an MSR X-GK II, I took a small dropper bottle of alcohol for priming.  No smoke or soot. Kept the jet clean.

    I like your old-school aluminum Sigg fuel bottle. Just like my old one.

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