Cooling system whit Ammonia not run

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Francesco Pietrangelo
回答： Yifeng Tang 2023-6-30
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.

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回答（1 个）

Yifeng Tang
Yifeng Tang 2023-6-30
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:
https://www.mathworks.com/matlabcentral/answers/1989653-error-using-system-level-refrigeration-cycle-2p

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