OUR TECHNOLOGY

OUR TECHNOLOGY

Enabling high storage density at ambient temperature

CO2 is the perfect fluid to store energy cost effectively in a closed thermodynamic process as it is one of the few gases that can be condensed and stored as a liquid under pressure at ambient temperature. This allows for high density energy storage without the need to go at extreme cryogenic temperatures.
CO2 is the perfect fluid to store energy cost effectively in a closed thermodynamic process as it is one of the few gases that can be condensed and stored as a liquid under pressure at ambient temperature. This allows for high density energy storage without the need to go at extreme cryogenic temperatures.
 

Our proprietary technology is based on a closed thermodynamic transformation that, by manipulating CO2 between its gaseous and liquid phase, enables efficient and cost-effective energy storage.

In charging mode, the CO2 is drawn from an atmospheric gasholder, the Dome, compressed and then stored under pressure at ambient temperature in a high density supercritical or liquid state. When energy needs to be released, the CO2 is evaporated and expanded into a turbine, and then returned back to the atmospheric gasholder, ready for the next charging cycle.

By storing in the liquid phase at ambient temperature, we significantly reduce the typical storage costs associated with CAES (Compressed Air Energy Storage) without having to deal with cryogenic temperatures associated with LAES (Liquid Air Energy Storage).

 

Our proprietary technology is based on a closed thermodynamic transformation that, by manipulating CO2 between its gaseous and liquid phase, enables efficient and cost-effective energy storage.

In charging mode, the CO2 is drawn from an atmospheric gasholder, the Dome, compressed and then stored under pressure at ambient temperature in a high density supercritical or liquid state. When energy needs to be released, the CO2 is evaporated and expanded into a turbine, and then returned back to the atmospheric gasholder, ready for the next charging cycle.

By storing in the liquid phase at ambient temperature, we significantly reduce the typical storage costs associated with CAES (Compressed Air Energy Storage) without having to deal with cryogenic temperatures associated with LAES (Liquid Air Energy Storage).


The principle

CO2


alt-text
1 kg of CO2
0.55 m3
High Pressure (70 bar)
Ambient temperature
1.3 liters
66.7 kWh/m3
alt-text
1kg of Air
0.82 m3
High Pressure (70 bar)
Ambient temperature
12 liters liters
2-6 kWh/m3
alt-text
1kg of Air
0.82 m3
Few bar
-190°C
1.1 liters
107 kWh/m3

CAES (Compressed Air Energy Storage) technology is a way of storing energy by compressing air and storing it under pressure. Air is not the perfect fluid to store energy because its energy density under pressure is very low. This means that to store energy cost effectively the only way is to use underground caverns which make this system site dependent and limits its competitiveness.

LAES (Liquid Air Energy Storage) solves this issue by liquifying air and hence reaching very high energy densities. However, the high energy density of liquid air has the drawbacks associated with cryogenic temperatures, which makes the system complex and uncompetitive. By using CO2 instead of air, Energy Dome has the same benefits of LAES and CAES (high energy density and storing energy at ambient temperature respectively) but without their associated drawbacks relating to efficiency, cost and site dependency.

The principle

CO2


alt-text
Starting
1 kg of CO2
Volume at ambient conditions
0.55 m3
Pressure in Storage conditions
High Pressure (70 bar)
Temp. in Storage conditions
Ambient temperature
Volume in Storage conditions
1.3 liters
Energy Storage density
66.7 kWh/m3
alt-text
Starting
1 kg of CO2
Volume at ambient conditions
0.55 m3
Pressure in Storage conditions
High Pressure (70 bar)
Temp. in Storage conditions
Ambient temperature
Volume in Storage conditions
1.3 liters
Energy Storage density
66.7 kWh/m3
alt-text
Starting
1kg of Air
Volume at ambient conditions
0.82 m3
Pressure in Storage conditions
High Pressure (70 bar)
Temp. in Storage conditions
Ambient temperature
Volume in Storage conditions
12 liters liters
Energy Storage density
2-6 kWh/m3
alt-text
Starting
1kg of Air
Volume at ambient conditions
0.82 m3
Pressure in Storage conditions
15 bar
Temp. in Storage conditions
-190°C
Volume in Storage conditions
1.1 liters
Energy Storage density
107 kWh/m3

CAES (Compressed Air Energy Storage) technology is a way of storing energy by compressing air and storing it under pressure. Air is not the perfect fluid to store energy because its energy density under pressure is very low. This means that to store energy cost effectively the only way is to use underground caverns which make this system site dependent and limits its competitiveness.

LAES (Liquid Air Energy Storage) solves this issue by liquifying air and hence reaching very high energy densities. However, the high energy density of liquid air has the drawbacks associated with cryogenic temperatures, which makes the system complex and uncompetitive. By using CO2 instead of air, Energy Dome has the same benefits of LAES and CAES (high energy density and storing energy at ambient temperature respectively) but without their associated drawbacks relating to efficiency, cost and site dependency.

Why CO2

 
Contacts