Gallery, Projects and General > How do I??

Safe from condensation

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andyf:

--- Quote ---CC opined: I don't think natural gas produces a similar amount of water vapour  [as propane or butane]
--- End quote ---

Natural gas is largely methane CH4; propane is C3H8 and butane is C4H10. So I should have thought the ratio of water to carbon dioxide after combustion will be greater with natural gas (methane) than with propane or butane. But it's 46 years since my organic chemistry at school.

Andy

Darren:
My Central heating boiler has a water drain from the combustion chamber, a fair bit of water comes out of that.

I think the old systems sent the water out the flue, but don't quote me on that cos I'm not a plumber ....

raynerd:

--- Quote from: andyf on October 28, 2009, 06:09:27 PM ---
--- Quote ---CC opined: I don't think natural gas produces a similar amount of water vapour  [as propane or butane]
--- End quote ---

Natural gas is largely methane CH4; propane is C3H8 and butane is C4H10. So I should have thought the ratio of water to carbon dioxide after combustion will be greater with natural gas (methane) than with propane or butane. But it's 46 years since my organic chemistry at school.

Andy

--- End quote ---

CH4 + 2O2 --> 2H2O + CO2

C3H8 + 5O2 --> 4H2O  + 3CO2

C4H10  +  6.5O2  --> 5H20  + 4CO2

So bigger hydrocarbens do produce more water per mole of fuel burnt but out of the three alkanes shown, the longer hydrocarbons have greater enthalpies of combusion and are more exotheric....they burn hotter, so I guess you wouldn`t need it on as long!! Is it swings and round-abouts?? I don`t know, interesting thought ....

raynerd:
... that was a conversation killer.

Darren:
Can't really follow on with that Chris, I have no idea what all that means  :lol:

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