Effects of exit-pressure variation on the hydrogen supply characteristics of metal hydride reactors

Tian Shiang Yang, Meng Lung Tsai, Din Sun Ju

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Here we examine how the temporal mean and steadiness of the hydrogen discharge rate of a metal hydride reactor (MHR) vary, when its exit-pressure is deceased quadratically with time. To accomplish this task, a mathematical model accounting for the hydrogen desorption kinetics of LaNi5 and the mass and energy balance in a cylindrical MHR is solved numerically. The initial and final exit-pressures of the MHR are prescribed, whereas the "pressure-drop time" (tPD, during which the exit-pressure is decreasing) and the initial exit-pressure drop rate (ṗe0) are the control parameters. Results of a systematic parameter study indicate that, for a given t PD, increasing ṗe0 generally increases the mean hydrogen discharge rate, while there is a particular ṗe0 that minimizes the variance of the hydrogen discharge rate. The MHR exit-pressure variation therefore can be "optimized" to discharge hydrogen with maximized temporal steadiness. Some other strategies for MHR performance improvement also are discussed here.

Original languageEnglish
Pages (from-to)8597-8608
Number of pages12
JournalInternational Journal of Hydrogen Energy
Issue number16
Publication statusPublished - 2010 Aug

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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