Re: OT: Natural gas vs LPG

Posted by RAB on January 16, 2007 at 15:14:51 from (195.93.21.42):

In Reply to: OT: Natural gas vs LPG posted by Tx Jim on January 16, 2007 at 10:43:17:

Now then:
When I went to school, the General Gas Equation was

PV = nRT

where
P = pressure
V= volume
n = Avagadro"s number (or was it moles?)
R= Ideal Gas Constant
T = Temp

All units would be metric, of course (Pascals, Litres, Kelvin).

Energy content will depend on C___C and C___H bonds ratios, water content and whatever else might be present.
I don"t think we covered much on Btu"s - already gone out of fashion in 1960s.
Used to use Kilocalories, now use Joules. Everything is so much easier in S.I. units.

However, as you can see, you are comparing "apples with oranges" with volumes of liquid and gas fuels (different pressures and therefore volumes). Need to get them at a standard temperature and pressure before you even start to compare energy content, let alone prices. No mention of transport and scrubbing costs or operating costs and profit margins, capital cost of well-head and pipeline etc.

There is much more energy in a C___C bond (none in methane) than in a C___H bond (as in methane)
If I were you I would not worry unless you can do something about it when you know the answer.
Regards, RAB

Replies:

• Re: OT: Natural gas vs LPG Brent in IA 04:33:52 01/17/07 (0)

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