Hi everyone,
Im having some questions regarding how to tune the PID for this application.
It is a jacketed tank, lets say 1000 liters, and its going to be heated with saturated steam. The liquid inside will be similar to water.
This is the first time tunning and implementing a PID.
I was thinking of implementing the ZN method in open loop to obtain initial values to the PID.
However I came with a question/problem. As the tank is closed and no liquid is going out, cant see how to stabilize the system with the valve opened at 50% lets say, so then I step the valve to 55% and see how the system reacts, and then get the constants for PID.
I assume if I have the valve opened at 50% and no liquid is going out, the water temperature will start to raise, until it evapores..
Cant figure out another situation, where a steady scenario might happen
If I open the steam valve, and there is no liquid going out of the tank, the temperature will raise until reaches 100°C, so steping the valve from 50% to 55% wont give me any information..
Am I missing something ??
Thanks!
Im having some questions regarding how to tune the PID for this application.
It is a jacketed tank, lets say 1000 liters, and its going to be heated with saturated steam. The liquid inside will be similar to water.
This is the first time tunning and implementing a PID.
I was thinking of implementing the ZN method in open loop to obtain initial values to the PID.
However I came with a question/problem. As the tank is closed and no liquid is going out, cant see how to stabilize the system with the valve opened at 50% lets say, so then I step the valve to 55% and see how the system reacts, and then get the constants for PID.
I assume if I have the valve opened at 50% and no liquid is going out, the water temperature will start to raise, until it evapores..
Cant figure out another situation, where a steady scenario might happen
If I open the steam valve, and there is no liquid going out of the tank, the temperature will raise until reaches 100°C, so steping the valve from 50% to 55% wont give me any information..
Am I missing something ??
Thanks!
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