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Aga 8 Vs Gerg (2008) In Prode

aga 8 gerg natural gas prode

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#1 pdender

pdender

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Posted 24 March 2015 - 09:50 AM

Prode Properties base includes AGA 8 which I utilize in most cases for gas density,

I have a few requests to adopt GERG method (available in extended version),

are the results (AGA 8 vs. GERG 2008) different so that I need both methods ?

There are several reports indicating that calculated values are very close.... 

 



#2 PaoloPemi

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Posted 24 March 2015 - 11:32 AM

for gas density results are very close (within 0.5%) with the advantage for AGA to be faster (up to 10:1),

the main advantage for GERG (2004 or 2008) is that it can model liquid phase (VLE, volume)

there are reports indicating that AGA has problems converging close to a dew point but it

may depend from some specific coding and, with Prode Properties, I have not observed those problems.

When solving complex problems which require many evaluations of gas density AGA should be preferred, in my opinion.

For VLE Prode includes several alternatives to GERG (2008),

for HC dew points if you compare GERG with extended PR results are in most cases within 1-2 K 



#3 pdender

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Posted 24 March 2015 - 06:12 PM

thanks,,if the values are very close I think I can use AGA for the present project






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