(588e) Hydrogen Car Fill-up: Thermodynamic Modeling Using the Generic Cubic Equation of State | AIChE

(588e) Hydrogen Car Fill-up: Thermodynamic Modeling Using the Generic Cubic Equation of State



In order to provide hydrogen fueling stations with required information about hydrogen’s pressure, temperature, and mass flowrate, hydrogen was modeled as a non-ideal gas employing the generic cubic equation of state (GC-EOS), along with its special four cases (VdW, RK, SRK, PR). With the purpose of validating the GC-EOS hydrogen thermodynamic property predictions, comparisons were carried out with NIST hydrogen’s data, real-life hydrogen fueling station data, and with a mass balance equation in integrable form. Both the results of the GC-EOS and the mass balance model matched the NIST data and the hydrogen fueling station data describing the time evolution of the molar volume inside of the hydrogen vehicle tank. In addition, based on the concept of residual properties, an explicit expression for constant-pressure and constant-volume heat capacity was derived based on the GC-EOS as a function of molar volume and temperature. The results from the heat capacities, based on GC-EOS, matched NIST hydrogen’s data at low pressures, and at pressures ranging from 100 to 1000 bar there is deviation less than 2%. Finally, the fueling station was modeled employing a total mass and energy balance, along with the GC-EOS, establishing that, in the absence of heat transfer, the maximum temperature achieved by hydrogen inside of the vehicle’s tank does not depend on how high or low the mass flowrate is, but rather it is a function of the amount of mass accumulated in the tank.

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