A high performance concrete composed of 75 percent quartz aggregates and 25 percent additives is used in EnergyNest’s thermal energy storage to convert waste heat to provide process steam or generate power.

EnergyNest says its thermal energy storage approach can tap energy that would otherwise be lost as waste heat from industrial heating operations. Once a facility is retrofitted and the energy is stored, the time-shifted waste heat can be used for low temperature process or comfort heating.

A steel carrier structure encloses Heatcrete-embedded carbon steel pipes, through which heat transfer fluid is charging and discharging the storage system at pressures up to 160 bar. A single module can provide energy capacity up to 2 MW hours thermal, says EnergyNest.