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Lithium bromide-mediated reaction performance enhancement of a chemical heat-storage material for magnesium oxide/water chemical heat pumps

Authors
Journal
Applied Thermal Engineering
1359-4311
Publisher
Elsevier
Publication Date
Volume
63
Issue
1
Identifiers
DOI: 10.1016/j.applthermaleng.2013.10.045
Keywords
  • Chemical Heat Pump
  • Magnesium Oxide
  • Magnesium Hydroxide
  • Expanded Graphite
  • Lithium Bromide
Disciplines
  • Chemistry

Abstract

Abstract The reaction performance enhancement of a chemical heat-storage material for a magnesium oxide/water chemical heat pump was discussed. A new composite, denoted as EML, was developed by mixing pure magnesium hydroxide with lithium bromide and expanded graphite, which were employed as reactivity and heat transfer enhancers, respectively. With respect to pure magnesium hydroxide powder, the EML composite showed higher reaction rates for dehydration and hydration transformations; further, the EML could dehydrate and hydrate at the same reaction temperature (200 °C). Addition of LiBr was found to decrease the estimated activation energy in the dehydration. The heat output capacity of the EML composite calculated at a hydration temperature of 110 °C was 1405.3 kJ kg−1, which was higher than that of pure MgO. It was established that the newly developed EML composite is a promising candidate for novel chemical heat-storage materials for chemical heat pumps at working temperatures of 200–300 °C.

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