Errors in the simulated control panel
Thread Content
Hello everyone, I used HEATER to simply simulate the dew point temperature of air at 8.6 MPa, but the result was incorrect; it showed as follows. Could someone please explain what the reason for this is? ** The error flash results are within tolerance, but they may be unsatisfactory because an extrapolated EOS liquid volume root was used for property calculations. The problem occurred during the flashing of the outlet stream. When I changed the inlet air pressure to 3 MPa, the calculation results were correct; however, they became incorrect when the pressure was set to 4 MPa or higher. Could it be that this model is also related to the critical pressure of the material?
As a supplementary note, the results of each simulation are not reproducible; that is, two simulations with identical input parameters yield different results, which is quite strange. I will examine this more carefully tonight to figure out what the problem is.
As a supplementary note, the results of each simulation are not reproducible; that is, two simulations with identical input parameters yield different results, which is quite strange. I will examine this more carefully tonight to figure out what the problem is.
Dude, the Aspen computer is at home, so it can only be transferred at night. Can we analyze it based on its literal meaning first, and then verify it tonight?
It’s also versatile, so why isn’t it getting any attention?
I already know the answer. But I don’t quite understand the English meaning
It is in the supercritical region; it makes no sense to calculate its dew point or bubble point. Supercritical fluids are neither in a gaseous nor liquid state, so there is no real dew point or bubble point, which is why errors occur. . .
Bro, what does EOS mean? When calculating pure gases, it’s fine even if the critical point is exceeded; however, for air which is a mixed gas, errors occur when calculating the EOS.
EOS itself should be a equation of state; in fact, even if the calculation results are correct, it doesn’t make much sense to consider the bubble point or dew point in the supercritical region. At such times, what matters is the distinction between the gas and liquid phases of the product itself, rather than the actual phase boundaries
The selected property equation is outside the range of applicability; although convergence is achieved, the results may not be accurate due to extrapolation.