search

usnistgov / REFPROP-wrappers

Wrappers around NIST REFPROP for languages such as Python, MATLAB, etc.
193 stars 127 forks source link

convergence error using refprop.m close to saturation lines #546

Closed jillblouse closed 1 year ago

jillblouse commented 1 year ago

It has been a while since I use refprop.m from REFPROP 10 in my simulation model in MATLAB. But mostly for fluid such as refrigerants and so, if the condition is close to 2-phase area, in iterations it can happen that the guesses gets in the 2-phase region and I get the error message and the model cannot run further. Since it is an iteration, the program supposed to ignore the error and either go back one step or make another guess to complete the iteration. So the question is how I can go around this error or ignore it somehow?

ianhbell commented 1 year ago
  1. The refpropm interface is deprecated, please migrate to the python interface for MATLAB
  2. Please provide a runnable example demonstrating the problem, otherwise we have no idea where to start debugging
jillblouse commented 1 year ago
  1. what do you mean using pyton interface? I call the refprop.m in my matlab code. So you mean it is possible to call the functions from a python file in matlab? Since I never had big issues with .m file so I could use it easily, but this error made the life a bit hard.
  2. It is a huge program that in every iteration calculates the properties of the gas in a specific pressure and temperature. However it seems in some points the quality value gets out of the range and it shows the error and jumps out.Mainly for water and refriegerants.

On Thu, Aug 17, 2023 at 11:10 PM Ian Bell @.***> wrote:

  1. The refpropm interface is deprecated, please migrate to the python interface for MATLAB
  2. Please provide a runnable example demonstrating the problem, otherwise we have no idea where to start debugging

— Reply to this email directly, view it on GitHub https://github.com/usnistgov/REFPROP-wrappers/issues/546#issuecomment-1682985946, or unsubscribe https://github.com/notifications/unsubscribe-auth/AOK3UBJBKEU6WPITE5TDCI3XV2CDBANCNFSM6AAAAAA3UR5ROE . You are receiving this because you authored the thread.Message ID: @.***>

ianhbell commented 1 year ago
  1. Please see https://github.com/usnistgov/REFPROP-wrappers/tree/master/wrappers/MATLAB . The refpropm interface is no longer supported, and has not been for a few years now.
  2. Please provide a runnable example of your failures.