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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2014006874
pages 91-107

KINETIC CHARACTERIZATION OF EXPANDED GRAPHITE, CALCIUM CHLORIDE, AND MAGNESIUM HYDROXIDE COMPOSITE FOR THE CHEMICAL HEAT PUMP

Seon Tae Kim
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-22, Ookayama, Meguro-ku, Tokyo 152-8550, JAPAN
Massimiliano Zamengo
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-22, Ookayama, Meguro-ku, Tokyo 152-8550, JAPAN
Junichi Ryu
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-22, Ookayama, Meguro-ku, Tokyo 152-8550, JAPAN
Yukitaka Kato
Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-22, Ookayama, Meguro-ku, Tokyo 152-8550, Japan

ABSTRACT

A composite chemical heat storage material, EMC, comprising a mixture of expanded graphite (EG), magnesium hydroxide (Mg(OH)2), and calcium chloride (CaCl2) has been developed as a magnesium oxide/water chemical heat pump reactant. The reaction kinetic characterization of the optimized EMC (which was an optimized mixing weight ratio of the material) was conducted. From BET and thermal conductivity measurements, it was confirmed that an optimized EMC had a higher specific surface area and thermal conductivity values than pure Mg(OH)2 on adding EG. The durability of the optimized EMC was also investigated by thermobalance and XRD experiments. EMC maintained enough reacted conversion and unchanged crystal structure throughout the repetitive experiment. The film diffusion control model was suggested as a dominant reaction process for MgO hydration by kinetic analysis of experimental results. In conclusion, the optimized EMC showed shorter dehydration time corresponding to the heat storage process period and enhanced hydration conversion corresponding to the heat output capacity than pure Mg(OH)2 on adding EG, a moldable and porous carbon material, and a CaCl2 hydrophilic material.


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