mass - energy

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mass - energy

Postby CNG » Thu May 11, 2006 4:15 am

I'm looking for a conversion factor for CCF (100 cubic feet) and 1 GGE (Gasoline Gallon Equivalent).

My understanding is that one is an energy measure and the other a physical measure.

Has anyone dealt with this before?

CNG
CNG
 

Re: mass - energy

Postby Guest » Thu May 11, 2006 5:30 am

CNG wrote:I'm looking for a conversion factor for CCF (100 cubic feet) and 1 GGE (Gasoline Gallon Equivalent).

My understanding is that one is an energy measure and the other a physical measure.

Has anyone dealt with this before?

CNG


1 GGE is the amount of any other fuel that has an energy content equal to one gallon of gasoline. Unfortunately gasoline is a blend of many different hydrocarbons and doesn't have a precise energy content. It is somewhere around 115,000 - 120,000 BTU per gallon, and different authors may give (slightly) different figures for what constitutes a GGE.

Natural gas is measured in standard cubic feet, or hundreds of cubic feet (CCF). It runs 950-1050 BTU per cubic feet. So somewhere around 1.17 CCF = 1 GGE, but it will depend (a little) on both the natural gas and the gasoline.

Note the natural gas is measured at standard temperature and pressure. In automotive applications, it is compressed to VERY high pressure, around 5000 psi, and occupies much less space. At that pressure, ideal gas law is pretty far off. You need to use compressibility factor, Van Der Waal's equation or some other more realistic state equation for pressure, volume, temperature relationships.
Guest
 


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