Is the two-phase heat transfer in the Simscape pipe based on a moving-boundary or finite-volume model?

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The Simscape pipe is a one-dimensional control volume capable of two-phase heat transfer. I am using this element for a condenser model, much as the example vapor-compression model supplied by Mathworks. I would like to know if the pipe element is formulated based on a moving-boundary or finite-volume approach. If it is a finite-volume approach, can the number of volumes be adjusted by the user?
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Andreas
Andreas on 31 Aug 2015
Hi Dave,
I'd also like to change the number of elements of pipe models in simscape in general. Unfortunately there is no such solution yet (except, copy ssc/modify/ssc_build). I started a topic concerning "adjustable discretisation", but with no positive feedback. http://www.mathworks.com/matlabcentral/answers/216358-simscape-are-there-ways-to-build-segmented-discretised-models-with-n-as-a-block-mask-parameter
I know the model you are using, would like to know the answer too.
Andreas
Andreas on 15 Oct 2015
The question above has been updated by someone - the number of volumes can be adjusted, with some additional coding.

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Answers (1)

Yifeng Tang
Yifeng Tang on 22 Jun 2022
The Pipe (2P) block is modeled using a "lumped"-parameter approach. Most of Simscape foundation blocks are modeled as a "lumped" block. The pipe here may be viewed as a fluid volume + one resistance at each port + wall convective heat transfer.
If you are looking to do a finite volume type approach, Andreas' thread provides some hints: using mask and mask functions to add blocks and lines. You may also use Simscape composite components to put together multiple pipes into one block.
Newer versions of Simscape Fluids have more sophisticated modules like heat exchangers, which in general uses the NTU method. You may check out those in "Simscape Fluids - Fluid Network Interface Library - Heat Exchangers".

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