Date:         Mon, 8 Nov 2010 13:39:13 -0800
Reply-To:     Alistair Bell <albell@SHAW.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Alistair Bell <albell@SHAW.CA>
Subject:      Re: Actual burn times with Mr Buddy MH9B (Little Buddy)
Comments: To: Courtney Hook <courtneyhook@SHAW.CA>
In-Reply-To:  <7FD34FED2156406E8883BE0BBC4204C7@MAINCOMPUTER>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

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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