Whenever I run my simulation using the Bravo et al. 1992 correlation for mass transfer, I get the following error for the RadFrac block:
** ERROR
VARIABLE RESET ENCOUNTERED IN VAPOR MASS TRANSFER CORRELATION
BRF-92. THE LIQUID HOLDUP CALCULATION FAILED TO CONVERGE.
I cannot alter the holdups settings in Aspen Plus. How do i solve this problem. The simulation works well with other mass transfer correlations.
Rate-based calculations are in general difficult to converge. I find the following to help.
1. Start with an equilibrium column and, after it is converged, switch to rate-based
2. Change the convergence properties to include damping at various levels
3. Increase the number of iterations in the convergence properties.
4. Attempt different types of columns (standard, azeotropic, cryogenic, etc.) even if they do not apply to your system.
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