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Amélioration de la densité d'énergie de matériau d'accumulation thermique chimique pour une pompe à chaleur chimique à oxyde de magnésium/ eau.

Energy density enhancement of chemical heat storage material for magnesium oxide/water chemical heat pump.

Auteurs : MYAGMARJAV O., ZAMENGO M., RYU J., et al.

Type d'article : Article

Résumé

A novel candidate chemical heat storage material having higher reaction performance and higher thermal conductivity used for magnesium oxide/water chemical heat pump was developed in this study. The material, called EML, was obtained by mixing pure Mg(OH)2 with expanded graphite (EG) and lithium bromide (LiBr), which offer higher thermal conductivity and reactivity, respectively. With the aim to achieve a high energy density, the EML composite was compressed into figure of the EML tablet (?7.1 mm × thickness 3.5 mm). The compression force did not degrade the reaction conversion, and furthermore it enabled us to achieve best heat storage and output performances. The EML tablet could store heat of 815.4 MJ mtab-3 at 300 °C within 120 min, which corresponded to almost 4.4 times higher the heat output of the EML composite, and therefore, the EML tablet is the solution which releases more heat in a shorter time. A relatively larger volumetric gross heat output was also recorded for the EML tablet, which was greater than one attained for the EML composite at certain temperatures. As a consequence, it is expected that the EML tablet could respond more quickly to sudden demand of heat from users. It was concluded that the EML tablet demonstrated superior performances.

Détails

  • Titre original : Energy density enhancement of chemical heat storage material for magnesium oxide/water chemical heat pump.
  • Identifiant de la fiche : 30017161
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 91
  • Date d'édition : 05/12/2015
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2015.08.008

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