ETES System Overview

Echogen’s solution turns thermal energy into electricity, using sand as the storage medium. The process involves using a carbon dioxide heat pump cycle to convert electricity into thermal energy by heating the sand-based reservoir, which is then converted back into electricity on demand.

Charging cycle

  • Heat pump (refrigeration) cycle
  • Uses electrical power to move heat from a cold reservoir to a hot reservoir
  • Creates stored energy as both “heat” and “cold”

Generating cycle 

  • Heat engine (power) cycle
  • Uses heat stored in hot reservoir to generate electrical power
  • “Cold” energy improves performance of heat engine

ETES for Thermo Geeks (PDF)

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