Return to site

High temperature thermal storage materials with high energy density and conductivity

Solar Energy Volume 163, 15 March 2018, Pages 307-314

· solar,solar thermal,storage materials,r3iventures
The MGA Thermal team has contributed to the field of thermal energy storage, solar energy, and materials science by publishing information on the technical implementation of our technology in a variety of scientific journals.
  • Two macroscopically solid, PCM enhanced thermal storage materials were developed.
  • The materials have significant energy density; 0.96 MJ/L and 1.1 MJ/L respectively.
  • Thermal conductivity is two orders of magnitude greater than conventional materials.
  • The phase change temperatures, 577 °C and 660 °C, suit steam turbine operation.
  • Short-term thermal cycling supported material stability in the operating range.

A metastable miscibility gap in the C-Al binary phase diagram has been exploited to produce macroscopically solid phase-change enhanced thermal energy storage materials.

With 50% by volume of Al or Al-12.7%Si dispersed in a graphite matrix, the materials have thermal conductivity of ∼150 W/m K, energy densities of 0.9 and 1.1 MJ/L for ΔT = 100 °C and energy storage/delivery temperatures centred around 660 °C and 577 °C respectively.

These characteristics are matched to both direct-steam and fluid-mediated concentrated solar thermal power systems using conventional Rankine cycle steam turbine-generator technology.

Powder metallurgy processing combined with a low-temperature binder ensures a non-percolating inverse microstructure in which the phase change Al or Al-Si particles are securely encapsulated, thereby overcoming the usual containment problems associated with metallic phase change materials.

The graphite and binder system used have been shown to be stable upon short-term thermal cycling or holding at the maximum expected operating temperature.

All Posts

Almost done…

We just sent you an email. Please click the link in the email to confirm your subscription!