Chemical heat-pump system working at exhaust temperatures of high-temperature-gas-cooled reactor

Satoshi Fukada, Yuki Edao, Masabumi Terashita

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A chemical heat-pump system using two hydrogen-absorbing alloys is proposed to utilize heat exhausted from a high-temperature source such as high-temperature-gas-cooled reactor, HTGR, which is designed to produce H2 more efficiently. The overall system proposed here consists of HTGR, He gas turbines, chemical heat pumps and reaction vessels corresponding to the three-step decomposition reactions comprising the I-S process. A fundamental research is performed experimentally on heat generation in a single bed packed with a hydrogen-absorbing alloy that works at the H2 production temperature. The hydrogen-absorbing alloy of Zr(V1-xFex)2 is selected as a material that has a proper plateau pressure for the heat-pump system operated between the input and output temperatures of HTGR. Temperature jump due to heat generated when the alloy absorbs H2 proves that the alloy-H2 system can heat up the exhaust gas even at 600 °C without any external mechanical force.

Original languageEnglish
Pages (from-to)540-546
Number of pages7
JournalInternational Journal of Hydrogen Energy
Issue number1
Publication statusPublished - Jan 2009

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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