Regarding expansion refrigeration
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Nitrogen expansion refrigeration: High-pressure nitrogen enters the impeller of the expander through a nozzle, driving the expander to rotate and turning it into low-pressure, low-temperature nitrogen. I would like to ask how to analyze the energy changes of nitrogen during the expansion process in an expander impeller? (How to analyze using the second law of thermodynamics): What changes occur in internal energy, static pressure energy, potential energy, and kinetic energy of nitrogen before and after expansion? Seek an answer
You can think of it as a throttling expansion process; potential energy and kinetic energy are likely to disappoint you
It cannot be regarded as a throttling expansion process, as it involves work being done on the impeller. For the specific calculations, one needs to refer to books on turbine design.