Abstract:
Thermal energy storage (TES) has the potential to
decarbonize the heating sector facilitating the penetration of
renewable energy sources, in particular solar thermal energy. In
this paper we present a study on thermochemical storage
material (TCM) composed of inorganic salts hosted in the
porous matrix of zeolite 13X with the addition of carbon
material. A series of composites containing different amounts
of inorganic salts - MgCl2, MgSO4 - graphite and carbon
nanotubes were prepared by impregnation method. Energy
storage and adsorption/desorption rates were assessed using
simultaneous thermal analysis (STA) by coupling
thermogravimetric (TG) and differential scanning calorimetry
(DSC). Microstructure and composition were assessed through
scanning electron microscopy and energy-dispersive X-ray
spectroscopy. With our composite material we achieved
exceptional energy density of 400 kJ/kg within the temperature
range 30-150°C. Such features make the material an interesting
option for thermal storage in buildings. We attribute the
behaviour of the material to to the combination of large zeolite
specific area coupled with the heat of sorption of MgCl2,
MgSO4.
Description:
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.
