yeah, just what I love about the list, a snarky response to (what I
thought was) an interesting post.

:)

Michael, you'll love this, I have the data on how much water vapour a
sleeping 160lb guy breathes out when asleep in - 5 C van.

but I'm not going to tell you unless you promise not to make another
snide comment.

:)

alistair

On 8-Nov-10, at 1:54 PM, Michael Sullivan wrote:

OK...First of all, Alistair needs to get another hobby....maybe it's
pork season??  Anyway, I would not use my figure bcuz I did not get
to the van that night until 5:30am for a 4 hour nap.  We also spent
alot of time(6 people) just chilling in the van and talking so had
the heater running then, also.  I guess I need to do another experiment.
BTW-Got my Heater Buddy last year for 40.00 at Lowe's due to a
listmember posting a one-day special.
Michael in San Antonio
91GL Weekender AT 2.1L 'Gringo'

On Mon, Nov 8, 2010 at 3:39 PM, Alistair Bell <albell@shaw.ca> wrote:
aha! its an opportunity, not to answer question, but to work out just
how much water vapour is produced by burning the 1 lb bottle of propane.

lets make assumption that no CO is produced, ie the heater is working
perfectly, and that there are 16 oz to the lb, or 454 g.

combustion equation:

C3H8 + 5O2 ----->  3 CO2  + 4H2O

so we see for every mole of propane burned, we get 4 moles of water.

molecular weight of propane = 44 g/mol

moles per 1 lb bottle = 454/44 = 10.3 moles

therefore burning the entire bottle would produce 4(10.3) = 41.2
moles of water

molecular weight of water = 18 g/mole

therefore 18(41.2) = 741.6 g of water produced.

almost 3 cups of water into the van in 6 hrs.

alistair

On 8-Nov-10, at 12:16 PM, Courtney Hook wrote:

Just hauled out my little Buddy Heater and it claims 6hrs on low with
a 1 LB cylinder. Has anyone actually ever timed one to see how
realistic that is? I'm doing it right now, but with a re-filled 1 LB
cylinder which never seems to refill completely. I'll see what I get.
Courtney

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Always be yourself, because the people that matter don't mind,
and the ones who mind, don't matter.