Hello all,
In Hysys I found next:
Water, at + 4 C, 1.013 bar:
Mass density is 1023 kg/m3
Std. Ideal Liq. mass density is 998 kg/m3
Liq. Mass density (Std. Cond.) is 1015 kg/m3
Why is the mass density in Hysys of water does not correspond with mass density from open resource, such Engineering ToolBox and another?
What is the difference between these 3 parameters? I tried to contact Aspen Support but I didn't understood their answer, probably someone will explain me "very simple"
Regards
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2 replies to this topic
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#1
Posted 14 May 2012 - 12:06 AM
#2
Posted 14 May 2012 - 01:57 AM
while I consider a 2% error acceptable for many calc's possibly you may get more accurate values setting a specific model as the steam tables,
for your reference I give the values for water density at 4C calculated with Prode Properties
IAPWS 95 -> 999.9749 Kg/m3
Regular->1003.947 Kg/m3
Peng Robinson Extended -> 1018.397 Kg/m3
in this case the errors are about 0.3% with regular model and 1.8% with the Peng Robinson equation of state,
of course Peng Robinson gives much more flexibility with mixtures (say water + hydrocarbons)
As alternative to extended EOS you may try Costald or equivalent procedures
for your reference I give the values for water density at 4C calculated with Prode Properties
IAPWS 95 -> 999.9749 Kg/m3
Regular->1003.947 Kg/m3
Peng Robinson Extended -> 1018.397 Kg/m3
in this case the errors are about 0.3% with regular model and 1.8% with the Peng Robinson equation of state,
of course Peng Robinson gives much more flexibility with mixtures (say water + hydrocarbons)
As alternative to extended EOS you may try Costald or equivalent procedures
#3
Posted 14 May 2012 - 09:46 PM
Mass Density is actual at stream conditions
Std Ideal is ideal solution at 15°C / 1 atm (or 60°F and 1 atm - it will change with the temperature units).
Std Mass Density is the actual value at 15°C and 1 atm (or 60°F and 1 atm).
The reason HYSYS disagrees is that it depends on the property package you choose. ASME Steam (1967) versus NBS Steam (1984) or other may differ from other packages.
Std Ideal is ideal solution at 15°C / 1 atm (or 60°F and 1 atm - it will change with the temperature units).
Std Mass Density is the actual value at 15°C and 1 atm (or 60°F and 1 atm).
The reason HYSYS disagrees is that it depends on the property package you choose. ASME Steam (1967) versus NBS Steam (1984) or other may differ from other packages.
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