Temperature changes of hydrogen during depressurization and pressurization
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Currently, hydrogen stations supply hydrogen using a system that involves pipeline delivery of hydrogen, on-site hydrogen production, and delivery by tank trucks; hydrogen refueling is then carried out through equipment such as hydrogen unloading columns, pressure boost compressors, hydrogen storage tanks, hydrogen refueling units, and sequence control panels. During transportation and storage, hydrogen pressure may increase or decrease. How does the temperature of hydrogen change during this process? Are there any calculation software or formulas?
The temperature of hydrogen usually drops during pressure reduction, as the expansion of the gas does work, resulting in a decrease in internal energy； During the pressurization process, the temperature rises because the compression of the gas does work, resulting in an increase in internal energy. Temperature changes can be calculated using the isentropic process in thermodynamics or Boyle’s law and Charles’s law. There are some engineering calculation software available on the market, such as Aspen Plus, which can be used to simulate and calculate the physical changes in these processes; however, manual calculations can also be performed using the ideal gas equation of state or the real gas equation of state. .
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During normal hydrogen depressurization, the temperature rises instead of falling, which is different from other gases.
Hello, in HYSYS dynamics as well, the pressure decreases while the temperature rises, but this doesn’t match the actual situation. Is there any good explanation for this? Thank you