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Aspen Plus - Base Method / Property Method Selection Problem

aspen plus

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#1 Nelson John

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Posted 24 June 2014 - 01:19 AM

For all those who faced the problem of selecting a base method under the property specifications tab (Data browser) in any of Aspen plus versions. (Found a user unable to select any of the methods from the drop down list) -- Solution: In case you are not able to make any selections (only then) -- Just checkmark the box " Modify property models" , enter any id, specify the below details under the modify property models. Now you will be able to select any BASE METHOD & PROPERTY METHOD of your choice. Hope this solution helps.


Edited by Nelson John, 24 June 2014 - 01:26 AM.


#2 ardalan4209

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Posted 18 October 2014 - 09:33 AM

I Have faced severe problem in modeling natural gas burner, aspen gives me an error like this:

PHYSICAL PROPERTY PARAMETER DGFORM   OR DGAQFM   IS MISSING FOR COMPONENT BELOW: AIR

I dont know what should I do to solve this problem, plz help



#3 PingPong

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Posted 18 October 2014 - 09:42 AM

Air is a mixture of several components, mainly nitrogen and oxygen.

 

Simply replace Air by a stream of 79 mol% N2 and 21 mol% O2



#4 ardalan4209

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Posted 18 October 2014 - 10:42 AM

Tank you for your hint, it worked, I have another question and I really appreciate if you help

Which base property method is more suitable for modeling with streams like air, natural gas and steam? I have faced dilemma between using PNG ROBINSON or IDEAL?

Sincerely



#5 PingPong

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Posted 18 October 2014 - 11:18 AM

Use Peng Robinson.



#6 ardalan4209

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Posted 19 October 2014 - 02:11 AM

Hi PingPong

Do you know what is the difference between polytropic compressor by using ASME method and polytropic compressor by using piecewise integration? I think the former uses ASME codes to design and is more accurate than the latter.



#7 PingPong

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Posted 19 October 2014 - 05:28 AM

ASME method is well known in the industry and is based on ASME Performance Test Code 10 (PTC 10-1997) which uses inlet and outlet conditions of compressor and applies a correction factor to calculate Work and Head.

 

I don't use Aspen, so I don't know the details of their "piecewise integration" method, but I expect that it divides the compression in a lot of small steps from inlet to outlet. You should check the Aspen manual for details.


Edited by PingPong, 19 October 2014 - 05:28 AM.


#8 ardalan4209

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Posted 19 October 2014 - 01:12 PM

woooww your information is complete and totally professional, really thank you






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