Refrigeration system simulation and optimization

[autt]

Hello everybody,

I have finished the refrigeration system optimization calculation before, then the static refrigeration system simulation with TXV last year, the static refrigeration system simulation with capillary was finished several days ago.

I can't understand how the system equilibrium is reached for a long time. I had searched many articles about static refrigeration system simulation in china but have no answer, some of the articles give the iteration logic but don't tell why, the logic can not be used in my assembled network structure as well.

But finally I have my theory: The key point lies in the refrigerant charging amount. If it is increased, the extra refrigerant will be mainly stored in condenser as liquid, because the gas region holds less weight, the super heat region of evaporator is controlled by TXV, so it's liquid region changes little. If extra refrigerant stays in evaporator the TXV will be closed a little to maintain the evaporator state, then the accumulated refrigerant in condenser cause condense temperature rising to contain more super cooled liquid. The system conditions are different for different charging weight.

System sample with TXV:

parameters change when charging weight changes:


System sample with capillary:


parameters change when charging weight changes:


The images are of jpg format, chage the extension name of URL to emf to get the emf format image.

I had thought to give some long term licenses of my software to this forum for everybody for I think it is very useful, now it is possible, the simulation is more understandable so it is easy to use and to check how accurate it is.

Also my software may have many bugs, I have no enough time on it, people here can help me a lot.

So I need to consult how to organize this, moderator please reply.

Thanks and Regards,
Yang