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ibell / coolprop

Deprecated version - go to
https://github.com/CoolProp/CoolProp
MIT License
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Properties for propylene are wrong #254

Open stefann82 opened 9 years ago

stefann82 commented 9 years ago

Using this as reference:

http://www.nt.ntnu.no/users/skoge/book-cep/diagrams/additional_diagrams/Propylene%20col.pdf (it says that this chart is based on Allprops)

H = 100e3 J/kg and P = 1e6 Pa should put us somewhere in the wet steam (two phase region)

In python: PhaseSI('H',100e3,'P',1e6,'propylene') 'liquid'

The web based Coolpropgit seems to agree with this:

http://ibell.pythonanywhere.com/coolpropgit/default/next?_formkey=5df936bc-e413-4ec8-9d72-e184310948e1&_formname=default&fluid=Propylene&name1=Pressure+[Pa]&name2=Enthalpy+[J%2Fkg]&unit_system=Mass-based&value1=1e6&value2=100e3

Quality = -1

I can't confirm if the chart is at fault or the numbers in the code because I don't have another source of data. Can someone look into this?

Thanks

ibell commented 9 years ago

This is the old respository. The new coolProp is at https://github.com/CoolProp/CoolProp.

Futhermore, this is almost certainly a question of reference state for enthalpy: https://github.com/CoolProp/CoolProp/blob/master/FAQ.md Recalculate the enthalpy using CoolProp and it should work fine.

On Tue, Apr 14, 2015 at 11:36 AM, stefann82 notifications@github.com wrote:

Using this as reference:

http://www.nt.ntnu.no/users/skoge/book-cep/diagrams/additional_diagrams/Propylene%20col.pdf (it says that this chart is based on Allprops)

H = 100e3 J/kg and P = 1e6 Pa should put us somewhere in the wet steam (two phase region)

In python: PhaseSI('H',100e3,'P',1e6,'propylene') 'liquid'

The web based Coolpropgit seems to agree with this:

http://ibell.pythonanywhere.com/coolpropgit/default/next?_formkey=5df936bc-e413-4ec8-9d72-e184310948e1&_formname=default&fluid=Propylene&name1=Pressure+[Pa]&name2=Enthalpy+[J%2Fkg]&unit_system=Mass-based&value1=1e6&value2=100e3 http://ibell.pythonanywhere.com/coolpropgit/default/next?_formkey=5df936bc-e413-4ec8-9d72-e184310948e1&_formname=default&fluid=Propylene&name1=Pressure+%5BPa%5D&name2=Enthalpy+%5BJ%2Fkg%5D&unit_system=Mass-based&value1=1e6&value2=100e3

Quality = -1

I can't confirm if the chart is at fault or the numbers in the code because I don't have another source of data. Can someone look into this?

Thanks

— Reply to this email directly or view it on GitHub https://github.com/ibell/coolprop/issues/254.