Modelling of metal hydride hydrogen compressors from thermodynamics of hydrogen – Metal interactions viewpoint: Part II. Assessment of the performance of metal hydride compressors

Performance of the thermally-driven metal hydride hydrogen compressor (MHHC) is defined by (a) its H2 compression ratio and maximum output pressure; (b) throughput productivity/average flow rate; (c) specific thermal energy consumption which determines efficiency. In earlier studies, focus R&D efforts was on optimisation design MH containers heat mass transfer in storage system aimed at shortening time cycle. This work considers an important but insufficiently studied aspect development industrial-scale thermally driven MHHC's – selection materials performance. Further to operation specified pressure/temperature ranges, should be based estimation productivity cycle, required for compression, together determine process The current presents a model single- multi-stage use Pressure Composition Temperature (PCT) diagrams utilized hydrides operating conditions temperatures pressures main operational features MHHC (number stages, amounts used, cycle time). Part I this [Lototskyy, Yartys, et al., Int J Hydrogen Energy, DOI: 10.1016/j.ijhydene.2020.10.090], we showed that calculated productivities significantly vary different materials. Analysis performance carried out (Part II) shows efficiency also depends types used layout. has been analysed number most practically AB5 Laves type AB2 alloys integrated into MHHC's. A comparison experimentally measured performances single-, two- three-stage developed authors their satisfactory agreement with modelling results thus demonstrating high value presented method proper during MHHC. As future development, evaluation two-stage pressure range from 30 500 atm between 20 150 °C.