
wyhaines
May 27, 2005, 6:07 AM
Post #8 of 16
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Re: [Cynthia7] Should I Buy a New Kitchen Stove??
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Propane is C3H8, and Butane is C4H10 (3 carbon, 8 hydrogen; 4 carbon, 10 hydrogen, respectively) They are very close to eachother with regard to the total amount of energy output from combustion, but because butane is heavier than propane, it boils at a higher (much higher) temperature, and that is the main drawback. Propane boils at about -42C, or close to -44F. Butane boils at about -.5C, or about 31F. If the gas is below its boiling point, you won't have sufficient vapor pressure in your tank to deliver the fuel, as a gas, to your appliance. Where this can become really important is when the tank is small (i.e. it doesn't have a lot of thermal mass itself) and/or when the ambient temperature around the tank is already low. As the liquid in the tank boils, and the vapor is siphoned off to burn in your appliance, the temperature of the remaining liquid in the tank drops (the liquid above the boiling point will give up its energy to form vapor until the liquid's temperature, as a whole, drops below the boiling point, so without sufficient heat input, boiling liquid quickly releases energy if allowed to do so). If the fuel in the tank drops below the boiling point, the vapor pressure will drop very fast, and you will no longer be getting an adequate flow of fuel. If you stove is giving you a weak, smokey flame right from the start of use, though, the problem is more likely in your equipment, I would think. You should be able to get close to the same energy output from a butane burner as a propane one, if your tank isn't too cold and your equipment is working right. Kirk Haines (living in a house that was butane heated originally, but now burns propane)
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