Evaluation of a thermally-driven metal-hydride-based hydrogen compressor

Numerical investigation on the operation and energy demand of a seven-stage metal hydride hydrogen compression system for Hydrogen Refuelling Stations

“…The first case is the isothermal compression, the second is the isentropic compression, whereas the last two are a polytropic approach and the isentropic by considering 75% efficient mechanical compressor (close to real life). A similar approach was reported from [20]. Table 7 presents the efficiencies for all the compression cases.…”

“…The advantages of the MHHCs over the competitive technologies are the simplicity of operation, the absence of moving parts; hence minimise the cost for maintenance and technical support, silent operation, reliability and compactness [14][15][16]. In addition, out of the technical point of view, is important to note that the efficiency of the MHHCs can be drastically improved if solar energy and waste heat from industrial sources will utilised instead of electricity [17][18][19][20]. Despite the advantages of the MHHC's over the mechanical compressors, there is still room for further development.…”

Electrochemical Compression Technologies for High-Pressure Hydrogen: Current Status, Challenges and Perspective

“…As for practical application, many MHCs have been developed with outlet pressures up to 35-70 MPa [72,73]. For example, Pickering et al [74] reported promising hydrogen absorption capacities in vanadium-based BCC solid solution alloys with high absorption/desorption kinetics at ambient temperature in which the addition of small amounts of niobium and manganese to Ti-V based alloys can result in a pressure of 65 MPa at moderate temperatures.…”

Development of a high-pressure Ti-Mn based hydrogen storage alloy for hydrogen compression

“…can be scaled to meet user requirements. Besides scalability, MHHCs offer a number of advantages such as simplicity in design and operation, the absence of moving parts, possibility of exploiting waste heat, safety, reliability and silent operation making them interesting alternatives to mechanical compressors or more recently developed alternatives such as electrochemical and ionic liquid hydrogen compressors [7,13,14]. Although recent techno-economic analyses [15,16] predicted only a marginal lower capital cost for MHHCs compared to the mechanical compressors, MHHCs suggested to benefit from the significantly lower operation and maintenance costs with the possibility to achieve even more operational cost reduction by using waste heat.…”