PID simulation for heating with heat pump

How can I simulate the operation of the heating system? I also have data from the influxDb database for the setpoint temperature and the current temperature measured in the room. I also have the output from the PID regulator from 0 to 1 entered in the database, which is now set to some arbitrary values.

What is the best way to simulate the system and find the most appropriate PID parameters?

Answer 1

[Sam Chak]

Hi @Branko

What is the best way to simulate the system and ...

If you are a newbie, I'd recommend modeling the system in Simulink because it allows you to monitor the signal at each output of the block.

... find the most appropriate PID parameters?

Simulation assumes that you need to describe the system using a mathematical model. Whether it accurately represents the real physical phenomena or not is a different story. However, if the mathematical model is fairly accurate and the predicted result is acceptable to the design engineers and stakeholders, then you can apply some control design tools, as taught in the textbooks, to analytically determine the P, I, D parameters that satisfy the performance requirements.

Alternatively, you can use the PID Autotuner to adjust the PID gains for you. If the results are unsatisfactory, you can tweak some tuning parameters and then run the tuning process again.

[Branko]

Hi Sam,

Thank you for your help and guidance. Yes, I'm a beginner here. I have a PID system made in Node-RED and I control the temperature by setting the output temperature from -5C to 5C according to the curve. This is done for Daikin HT heat pump.

You have conversion of temperature to voltage. That probably I can leave the temperature?

I have a bigger problem how to make my own system or plant. Could I use something already made and complement it?

Thank you.

BR,

Branko

[Branko]

Hi @Sam Chak

Thank you for your help and guidance. Yes, I'm a beginner here. I have a PID system made in Node-RED and I control the temperature by setting the output temperature from -5C to 5C according to the curve. This is done for Daikin HT heat pump.

You have conversion of temperature to voltage. That probably I can leave the temperature?

I have a bigger problem how to make my own system or plant. Could I use something already made and complement it?

Thank you.

BR,

Branko

[Sam Chak]

Hi @Branko

These are just general advice and guidance based on what you originally asked. Currently, @William Rose is providing guidance to a forum user on how to apply the system identification technique to obtain the transfer function of the plant, which is also a thermal system. The link is given below:

https://www.mathworks.com/matlabcentral/answers/2048252-estimating-transfer-function-of-a-system-with-input-and-output-values-as-well-as-kp-and-ki-values?s_tid=srchtitle

Consider closing this question and then posting a new question with specific details, or editing your question for more details on the thermal system with heat pump.