Abstract

The effective thermal conductivities (TCs) of pelletized magnesium hydroxide (Mg(OH)2)/expanded graphite (EG), and magnesium oxide (MgO)/EG composite heat storage materials with high packing densities were measured at 110 °C over a wide range of Mg(OH)2 and MgO compositions. The effective TCs of both Mg(OH)2/EG and MgO/EG decreased with increases in the Mg(OH)2 and MgO content. The present values reasonably agreed with the extrapolations of those of the composites with low levels of packing density listed in the literature. The hydration conversion ratio of MgO/EG was lower than that of powdery MgO at both 90 and 110 °C for 60-min hydration because the water vapor transfer would be decreased by the EG layers. The 60-min hydration conversion ratio of MgO/EG at 90 °C was close to that at 110 °C in contrast to the results of the powdery MgO. Moreover, the notable reductions in the hydration conversion ratios of MgO/EG were observed at a relatively high initial Mg(OH)2 concentration.

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