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Cooling system whit Ammonia not run

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Francesco Pietrangelo
Francesco Pietrangelo on 16 Jun 2023
Answered: Yifeng Tang on 30 Jun 2023
Hi, in this cooling system I am using R-717 ammonia to refrigerate a block (system-wide refrigeration cycle). The problem is that I cannot square the temperature ratings and pressures for R-717. The ammonia evaporates to -33°C but the system is pressurized, but it keeps giving me an error: Error:
Error compiling Simscape network for model trial_biphasic_13_06d.
Caused by:
['trial_biphasic_13_06d/System-Level Refrigeration Cycle (2P)']: The values in the table grid vector are not strictly monotonic
I do not understand if it is a problem in the fluid properties or in the block parameters used.

Answers (1)

Yifeng Tang
Yifeng Tang on 30 Jun 2023
Hi Francesco,
We believe the error has to do with the fact that NH3 has a non-monotonic supercritical line. It needs to be fixed in the future.
For a workaround, please see this answer with a very similar problem:


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