suppose from the data sheet i know the max. flow and selected Cv of the control valve plus the operating conditions. With that information , how do i calculate the flowrate for 25% and 50% opening. In the data sheet, the pressure drop was wrongly selected, and i am using the current pressure drop as per conditions.
The value of Cv given by Hysys is the Cv max of the valve. Let's say I choose an opening of 50% with a linear opening. If Aspen says Cv (max) is 100, then the value used by the solver is 50, because the opening is 50% (again, assuming linear opening). When I change the opening % with the same other parameters, the calculated Cv max will be different. For 25% opening, the value of Cv max will be 200, but the value used by the solver will be, again, 50 (200 * 25%). To sum up, Aspen shows Cv max, and the value of Cv used for the calculations is hidden.
Can you post the presentation here?
Thanks a lot, just one question, by knowing the actual pressure drop, how to conclude the size of the control valve?
suppose from the data sheet i know the max. flow and selected Cv of the control valve plus the operating conditions. With that information , how do i calculate the flowrate for 25% and 50% opening. In the data sheet, the pressure drop was wrongly selected, and i am using the current pressure drop as per conditions.
What is the control valve size, like 3 inch or 4 inch
Why Cv value increases as we decrease valve opening % in Hysys. The Cv should be maximum at 100%.
The value of Cv given by Hysys is the Cv max of the valve. Let's say I choose an opening of 50% with a linear opening. If Aspen says Cv (max) is 100, then the value used by the solver is 50, because the opening is 50% (again, assuming linear opening). When I change the opening % with the same other parameters, the calculated Cv max will be different. For 25% opening, the value of Cv max will be 200, but the value used by the solver will be, again, 50 (200 * 25%). To sum up, Aspen shows Cv max, and the value of Cv used for the calculations is hidden.
@@PhilBou-ww4iz😂