Edited by chemdoc, 06 April 2018 - 08:45 AM.
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Compressor , Expander Simulation With Prode Properties
#1
Posted 06 April 2018 - 08:44 AM
#2
Posted 06 April 2018 - 09:56 AM
the polytropic solution with phase equilibria (options 3 and 4 in Prode Properties) adopts a procedure not too different from integration of the Z function (options 1 and 2) but adopts a numerical method while for options 1 and 2 there is a analytic solution,
both procedures integrate (analytical or numerical solution) Maxwell equation
dH = T*dS + V*dP
working with a gas phase, the polytropic solution with phase equilibria (options 3 and 4) is a bit less accurate than integration of the Z function (options 1 and 2) and slower (due to VLE calc's),
anyway, you can adopt the polytropic solution with phase equilibria (options 3 and 4) in all cases where the procedure based on integration of the Z function (options 1 and 2) fails (possibly due to detection of liquid phase)
#3
Posted 09 April 2018 - 07:11 AM
thanks Paolo,
do you know if there is a possibility to force a vapor or a liquid state in dense phase region working with Prode Properties ?
#4
Posted 09 April 2018 - 08:31 AM
before to answer I did some tests at high pressures with the compostion C1 0.5 CO2 0.5 model GERG 2008 , with data given in paper "Limitations of ASME PTC 10 in Accurately Evaluating Centrifugal Compressor Thermodynamic Performance" (Sandberg, Colby) which compares different methods,
there is a comparison table with several cases (I include two here)
P1 1500 psia T1 90 F P2 5364.3 psia T2 291.3 F , Poly.Eff. 0.82 Prode calculates 0.82062
....
P1 1700 psia T1 70 F P2 9266.9 psia T2 311.5 F , Poly.Eff. 0.82 Prode calculates 0.82086
in all the the cases which I tested, Prode Properties calculated the correct values with (very) limited errors (compared to ASME PTC 10 method),
anyway, you can force vapor state by increasing the minimum allowed value for liquid density,
ProdePropertiesdensephasesettings.jpg 132.28KB
1 downloads
if you increase the value to 500 Kg/M3 or above the software in most cases will detect a vapor / gas phase...
#5
Posted 10 April 2018 - 09:27 AM
thanks, that solves the problem...
#6
Posted 25 September 2018 - 09:13 PM
Hello
I found this android App where you can check the performance of compressor and turboexpanders
https://play.google.com/store/apps/details?id=appinventor.ai_methane_solutions.GasEngineering
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