SustainX's isothermal compressed air energy storage (ICAES™) technology enables a site-anywhere, zero-emissions storage solution. Through superior thermodynamics, SustainX technology frees compressed air storage from the risks of caverns and the emissions of natural gas.
Isothermal compression allows air to reach high pressures without the inherent challenges of high temperatures or high thermal losses. Compressed air at near ambient temperature can be stored until needed with minimal energy losses. When power is needed, isothermal expansion can deliver electrical energy with no requirement for natural gas combustion
SustainX achieves isothermal cycling by combining patented innovations with a design centered on mature industrial components and principles. A mechanical drivetrain utilizes an electric machine and a crankshaft, the latter proven through decades of service in other industries. This efficient mechanical link powers a two-stage, mixed-phase (water-in-air) heat-transfer process within pneumatic cylinders. During piston strokes, water is sprayed into the air-filled chamber of each cylinder, allowing heat to be transferred from water to air during expansion or from air to water during compression. The same ICAES power unit provides both isothermal compression and expansion, eliminating the cost of separate compressor and expander subsystems.
This patented approach achieves high round-trip efficiency, proven long lifetime, and low cost, allowing SustainX to deliver a levelized cost of energy (LCOE) disruptively low in comparison to competing storage technologies.
Key advantages of ICAES™: