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MAN Diesel & Turbo partners with ABB to develop and commercialize new electro-thermal stationary energy-storage system

MAN Diesel & Turbo Schweiz AG has signed a cooperation agreement with ABB Switzerland for the development, production and commercialization of a three-way energy-storage system. The new Electro-Thermal Energy Storage system (ETES) stores large-scale electricity, heat and cold for distribution to consumers.

ETES uses surplus renewable-electricity to generate heat and cold for storage in insulated reservoirs during a so-called charging cycle. The heat and cold can be converted back into electrical energy on demand.

Moreover, it is possible to distribute the stored cold and heat to different types of consumers. For instance, heat can be transferred to district heating, the food-processing industry, laundry facilities, etc., whereas applications for the cold include cooling data-centers, ice-hockey arenas or air-conditioning for skyscrapers. The system is location-independent and designed to suit various boundary conditions.

The biggest challenge in building stable, climate-neutral energy systems is the intermittency of renewable energy in power generation and supply. To match an increasing consumer demand for energy with a fluctuating supply, the world needs reliable energy-storage systems.

At MAN Diesel & Turbo we have made it our mission to drive the transition towards a carbon-neutral world. Together with our partner, ABB, we now offer a complete solution for the storage, use and distribution of electrical and thermal energy that is groundbreaking.

—Dr. Uwe Lauber, CEO of MAN Diesel & Turbo

The turbomachinery technology and the process design of the charging and discharging cycle are the key elements of this energy-storage system and reflect MAN Diesel and Turbo’s core competences. ETES features MAN’s hermetically-sealed turbo compressor HOFIM within the charging cycle to compress the CO2 working fluid to its supercritical state at typically 140 bar and ca. 120 °C.


Charging Cycle:

  1. The HOFIM turbo-compressor runs on surplus energy from renewable resources, compressing CO2 in the cycle, which is heated to 120 °C.

  2. The CO2 is fed into a heat exchanger and heats the water.

  3. The hot water is stored in isolated tanks, each one at a separately-defined temperature level.

  4. Still under high pressure, the CO2 is fed into an expander, which reduces the pressure—the CO2 is liquefied and cooled.

  5. The liquefied CO2 is again pumped through a heat-exchange system, this time on the cold side of the system.

  6. Heat is taken from the surrounding water and ice is formed in the ice storage tank.


Discharging Cycle:

  1. Gaseous CO2 enters the heat exchanger on the cold side of the system where it condenses because of the cold from the ice-storage tank.

  2. The ice in the tank melts.

  3. The CO2 pump increases the pressure of the CO2 again.

  4. The CO2 passes through the heat exchanger.

  5. The CO2 is heated by the water in the hot-water storage tanks.

  6. The heat from the heated CO2 is fed into the power turbine where it is converted back into electrical energy via a coupled generator. The electricity flows into the grid and is distributed to consumers.



Nice to see the adults getting involved in energy storage.
Any hints as to capacity, cost, efficiency, demonstration unit completion etc?

David Freeman

I doubt it's all that efficient, since the temperature differential is pretty low. CO2 is probably similar to ORC, so expect ~10-12% efficiency. The value is not the generation of electricity with the CO2 turbine, but the production of heat/cooling for industrial/building purposes.

The temperatures are not low enough for the CO2 to actually condense - this isn't a Rankine cycle with phase change. Rather, the cooled CO2 is easier to compress.

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