A metal hydride based hydrogen compressor using MmNi4.6 Al0.4 is tested at both constant and variable delivery pressures. The effects of operating parameters such as supply pressure and heat source temperature on the compressor performance are investigated. The compressor yields a maximum isentropic efficiency of 7.3% at 95 {ring operator} C heat source temperature at variable delivery pressure operation mode, and 14.2% at 85 {ring operator} C heat source temperature at constant delivery pressure operation mode. At both the operation modes, the volumetric efficiency of the compressor is found to decrease at high heat source temperatures. © 2007 International Association for Hydrogen Energy.

M. Prakash Maiya

Department of Mechanical Engineering

Hydrides

Pressure effects

Volumetric analysis

HEAT SOURCE TEMPERATURE

HYDROGEN COMPRESSORS

Isentropic efficiency

Volumetric efficiency

Compressors

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

International Journal of Hydrogen Energy

Influence of operating parameters such as heat source and sink temperatures, operating pressures, pressure ratios, cycle time, and bed parameters such as overall heat transfer coefficient, bed thickness and thermal conductivity, on the performance of a single stage hydrogen compressor is presented. Coupled heat and mass transfer and reaction kinetics are considered for the analysis. An AB2-type alloy, Ti0.98Zr0.02V0.43Fe0.09Cr0.05Mn1.5 is chosen as an example. At a given pressure ratio, the hydrogen throughput increases with hot fluid temperature and decreases with increase in cold fluid temperature. Optimum values of thermal conductivity and overall heat transfer coefficient exist for any given hot and cold fluid temperatures. Among the variables studied, heat transfer fluid temperature, bed thickness and supply pressure are found to exert significant influence on the compressor performance. © 2002 Published by Elsevier Science Ltd on behalf of the International Association for Hydrogen Energy.

Parametric studies on a metal hydride based single stage hydrogen compressor

Metal hydride thermosorption compressors with improved dynamic characteristics

ECOS '95, Efficiency, costs, optimization, simulation and environmental impact of energy systems, Istanbul, Turkey, 11–14 July 1995

Performance tests on a thermally operated hydrogen compressor

Journal	International Journal of Hydrogen Energy
ISSN	03603199
Open Access	No