Search found 11 matches

by Chani
15 February 2021, 09:28
Forum: COCO (AmsterCHEM)
Topic: Failed to calculate logFugacityCoefficient
Replies: 10
Views: 42458

Re: Failed to calculate logFugacityCoefficient

Thank you Jasper and Dr. Ross for the reply.

I have checked and the gas feed is at the bottom and liquid at the top of the column.

Yes, I know I can't modify chemsep databank of compounds so I created my own pcd file and added the rest of the components I need and saved it in another location.
by Chani
12 February 2021, 15:08
Forum: COCO (AmsterCHEM)
Topic: Failed to calculate logFugacityCoefficient
Replies: 10
Views: 42458

Re: Failed to calculate logFugacityCoefficient

Yes, I added Sulfur and Sulfuric acid.

It doesn't allow me to add the extension pcd to this forum. I will send it to your email.
by Chani
11 February 2021, 17:50
Forum: COCO (AmsterCHEM)
Topic: Failed to calculate logFugacityCoefficient
Replies: 10
Views: 42458

Failed to calculate logFugacityCoefficient

Hello, I am getting these messages when solving this flowsheet: - Invalid floating point operation - error: calculate failed for unit IAT: run failed: Failed to calculate logFugacityCoefficient: CalcSinglePhaseProp failed: Property evaluation using equation of state failed: Total composition is zero...
by Chani
10 February 2021, 09:11
Forum: TEA Thermodynamic server (AmsterCHEM)
Topic: Adding Air to COCO Property Package
Replies: 1
Views: 10768

Adding Air to COCO Property Package

Hello,

I have been trying to add Air as a compound to the property package but a message keeps showing up.
by Chani
29 January 2021, 10:56
Forum: ChemSep Unit Operation
Topic: Reaction in Absorber
Replies: 1
Views: 21094

Reaction in Absorber

Hello, I am having some trouble adding a reaction to the absorption column in Chemsep. The reaction that occurs is: H2O + SO3 -> H2SO4 with a reaction heat of −132 000 kJ/kmol. I suppose the reaction type is Kinetic Equilibrium as the other options given is not possible. When I select this option fo...
by Chani
14 January 2021, 11:49
Forum: COCO (AmsterCHEM)
Topic: Reaction Rate Expression - Conversion Problem
Replies: 4
Views: 18263

Re: Reaction Rate Expression - Conversion Problem

Yes, correct!

Sorry for the misunderstanding.
by Chani
12 January 2021, 21:02
Forum: COCO (AmsterCHEM)
Topic: Reaction Rate Expression - Conversion Problem
Replies: 4
Views: 18263

Re: Reaction Rate Expression - Conversion Problem

Hello,

Sorry but please could you explain why the partial pressure expression should be: (P/101325)^2?
If the pressure given is in Pascals you just need to divide it into 101325 to transform it to atmosphere, right?


Thank you x
by Chani
15 December 2020, 18:36
Forum: COCO (AmsterCHEM)
Topic: Reaction Rate Expression - Conversion Problem
Replies: 4
Views: 18263

Reaction Rate Expression - Conversion Problem

Hello, I have assigned a reaction expression for the oxidation of sulfur dioxide with a catalyst (Heterogeneous Reaction). The reactor converts the sulfur dioxide to sulfur trioxide but with the 3rd reactor the conversion reaches more than 100% which is impossible. I just want to make sure that the ...
by Chani
28 November 2020, 17:35
Forum: COCO (AmsterCHEM)
Topic: Controlling Temperature
Replies: 5
Views: 19279

Re: Controlling Temperature

Okay, as I want to control the outlet temperature of the heat exchanger with the flow of the inlet cold stream, the best specification would be "heat exchange" but again, I have no value to set it as initial guess. Any value I add, the error shows up "Maximum number of iterations exce...
by Chani
28 November 2020, 13:26
Forum: COCO (AmsterCHEM)
Topic: Controlling Temperature
Replies: 5
Views: 19279

Re: Controlling Temperature

Thank you for your reply! I changed the specification of the heat exchanger to "Max Heat Exchange" but I cant see an iteration going on (maybe its too fast) although the flow value of the controlled stream for the outlet temperature to be 723K is correct. Also, how can the vapor that leave...

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