Where can I find the source code of 3-Zone Pipe (2P)?

I would like to know where the source code (.ssc file) of 3-Zone Pipe (2P) (Simscape/Fluids/Two-Phase Fluid/Pipes & Fittings) is available.

For example, about Pipe (2P), I confirmed that it is available below.

C:\Program Files\MATLAB\R2020a\toolbox\physmod\simscape\library\m\+foundation\+two_phase_fluid\+elements

Answer 1

[Vasco Lenzi]

Hi Takahiro

unfortunately most of the components in the Simscape Fluids library are not open. Only Simscape Foundation library is fully open, where you found the simple Pipe (2P).

Why are you looking for the source code? To understand better how it was implemented, or to modify it?

https://ch.mathworks.com/help/physmod/hydro/ref/3zonepipe2p.html

We try to provide all the equations/explanations in the documentation for the block. Pelase let us know if somethings were not clear enough.

[Takahiro Nagano]

Hi Vasco.

Thanks for your reply.

I was looking for the source code because I would like to modify its heat transfer coefficient.

I think the only way to change the heat transfer coefficient is to rewrite the Simple Pipe (2P) source code based on the documentation.

Am I right?

[Vasco Lenzi]

Hi Takahiro. It depends. If you set wall thickness to 0 and the ratio of external/internal fins to 0, you only have one parameter for the heat transfer coefficient, which can be parametrized in the block mask. So you can reduce all calculation to a simple heat transfer coefficient.

I don't know if this would help you accomplish what you are looking for. If you would like to change the underlying equations, then yes the only way is to rewrite the Simple Pipe (2P).

Thanks and best regards

Vasco

[Takahiro Nagano]

Hi Vasco.

Thank you for your quick response.

I would like to modify the heat transfer coefficient of the refrigerant, so, I will try to rewrite the source code.

Thank you very much.

Takahiro

[Tech Logg Ding]

Hi Vasco and Takahiro,

I am also interested in the source code as I would like to understand how the zone lengths are implemented. I am also interested in changing the heat transfer coefficients to simulate a heat exchanger better. On a side note, in order to use the suggested method, different properties of the fluid is still required (fluid heat capacity etc.) to calculate the heat transfer coefficients. Therefore, that method will be quite difficult to implement correctly.

The 2P pipe model does not account for dynamic phase change and I think you need to connect multiple blocks together to mimic the effects of a Finite Volume (FV) model.

Besides that, for the 3 Zone pipe model, how can I tune the dynamic response? Can it only be achieved through the phase change time constant?

Thank you very much for your time.

Regards,

Ding

[Vasco Lenzi]

Hi Ding

if you are looking for heat exchanger based on 2 phase domain, you could check out the prerelease for 20b if you can. We have a new heat exchanger Thermal Liquid - 2Phase coming up. Do remember that 20b is a beta release and is not supposed to be used for production work, but to check out new feature. Take a look at the block and see if it could fit your needs before modeling something new.

The 2P pipe model does not account for dynamic phase change and I think you need to connect multiple blocks together to mimic the effects of a Finite Volume (FV) model.

That's correct, see example:

https://ch.mathworks.com/help/physmod/simscape/examples/fluid-vaporization-in-pipe.html

Besides that, for the 3 Zone pipe model, how can I tune the dynamic response? Can it only be achieved through the phase change time constant?

If I understand your question correctly, yes only through that.