International Journal of Hydrogen Energy, Vol.41, No.23, 9780-9788, 2016
Realistic simulation in a single stage hydrogen compressor based on AB(2) alloys
A simulation analysis was performed to study the thermodynamic behavior of a realistic single stage hydride compressor, taking into account real H-2 gas behavior by implementing several H-2 equations of state, as well as realistic features in the hydrogen sorption properties of the hydride, like sloping plateau and hysteresis. The model was validated with experimental data from two different AB(2) hydride systems, a low pressure Ti0.9Zr0.1Mn1.34V0.3 and a high pressure Ti0.9Zr0.1Mn1.47Cr0.4V0.2 alloys. The materials were characterized by X-ray powder diffraction (XRPD), Scanning Electron Microscopy (SEM) and Energy Dispersion X-ray spectroscopy (EDX). The numerical study was divided in three main parts: the effect of implementing real/ideal hydrogen gas models, a study of how the equations of state affect the Pressure composition Isotherm (P-c-T) determination and the influence of each model and realistic features of the P-c-T on the compressor simulation. Among all the models tested, Hemmes and Joubert real models give the more confident values for the compression ratio and final moles in the system volume at a final temperature of 353 K and pressures <50 bar. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.