Sustainable & digital engineering Energy and storage management

ETTRINGITE - low-temperature heat storage

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Energy needs, which are constantly on the increase, are mainly met by fossil fuels (80%), which are responsible for greenhouse gas emissions and global climate change. Energy issues are becoming crucial. 

In this context, in order to overcome the time lag between energy production (increasingly intermittent) and demand, heat storage is a major challenge for the energy mix.

Competitive advantages

  • High storage density at low temperatures (300 kWh/m3)
  • Suitable for daily and seasonal storage
  • Low unit cost of material
  • Can be reused in the sector

Applications

  • Industrial: Storage and reuse of low-temperature heat, heating of small units such as control rooms
  • Tertiary: Maintaining temperature, maintaining comfort
  • Raising the temperature of water circuits

Intellectual property

  • Patent

Development stages

Laboratory validation of the technology

Laboratory

pictrogramme d'illustration

LMDC INSA

Description

  • The proposed solution enables energy to be stored in the form of heat and released at the appropriate time

  • Ettringite-based storage material

  • Solid/gas thermochemical system

  • This storage is carried out at low temperature (between 20 °C and 60 °C)

Schéma de fonctionnement

Technical specifications

  • Material: Porous material based on ettringite (50% to 70% porosity), with good mechanical strength
  • Gas: Humidified heat transfer gas
  • Properties:
    • High energy storage density at low temperatures (~300 kWh/m3 between 20 °C and 60 °C):
    • Heat storage and removal phase up to four days (maximum laboratory test)
    • Temperature rise up to 20 °C
    • Storage efficiency >70%