CarloTorresCE

Ok, thanks. I will try downgrading. Cheers Carlo

Hi, I have a ChemSep stripping column that works fine. If I try to change the number of stages or the position of the feed I get "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index" and the flowsheet gets unusable because the streams do not connect anymore. Any suggestion? Thanks in advance Carlo

Hi Daniel, I would like to have a hint about the best way to solve the problem in the attached flow sheet. There is a stream of solvent that is warmed up with condensing steam. I wish to calculate the amount of steam to be used assuming the condensate would be say 3 degrees subcooled. For this task I am using a Controller Block. The solution is 144 kg/h of steam. I start with an initial guess of 200 kg/h, the controller block is set to "solve globally" so I would expect that solving the flow sheet...

to reproduce the error follow these steps: - open dwsim - choose "new simulation". The simulation configuration wizard will open - click "next" - click "Add from Other Sources >" - in the text field "Name, CAS ID or Formula" type "cyclopentanone" - select the first item in the list and click "next" - click "finish"

Hi, thanks for your reply. The cp curve does not look bad. So I guess it is an inaccurate prediction of the enthaply estimation method, for some reason. I tryed all but without success. A comment on this: the setting for this parameter is lost when the simulation file is saved. When I reopen the file, the method always defaults to Lee-Kesler. I tryed to retrieve other parameters for Cyclopentanone from online sources, but I got the following error when I click the "finish" button (I think is a bug):...

Hi Daniel, maybe you can advice about the basic topic of a thermal balance calculation. I have an issue with a big flow sheet but I attach a simplified one. A mixture of water and cyclopentanone is warmed up. I use a heat exchanger unit operation but the results look totally wrong to my eye. With a flow of 1 kg/s and a Cp of 2.4 kJ/kg K I would expect a duty of about 48 kW if delta T is 20 °C, but the unit operation calculates 21 kW which is clearly the difference in the enthalpy of the streams,...