MAN Diesel & Turbo Schweiz AG and ABB Switzerland have joined hands to develop a new Electro-Thermal Energy Storage System (ETES) to store large-scale electricity, heat, and cold for distribution to consumers. ETES has been designed to use surplus renewable-electricity to generate heat and cold for storage. This generated heat and cold can be modified on demand toelectrical energy.
The companies claim that the stored thermal energy can be distributed to consumers. The heat can be used by district heating, the food-processing industry, and laundry facilities. The cold can be for cooling data centers, ice-hockey arenas, and air-conditioning.
The ETES system makes use of MAN’s High-Speed Oil-Free Integrated Motor-Compressor (HOIFM) turbo-compressor. The HOIFM turbo-compressor uses surplus renewable energy and in its cycle, compresses carbon dioxide which has been heated to 120oC.
This carbon dioxide is then passed through a heat exchanger which heats the water within. The hot water is then stored at specifically defined temperatures in isolated tanks.
The high-pressure carbon dioxide is then passed through an expander which cools and liquefies it. This liquefied carbon dioxide is then fed into the cool side of the heat exchange system. This absorbs heat from the surrounding water and condenses it into ice.
With the problem of exhaustion of non-renewable sources of energy and an increase in the carbon footprint, it is high time to shift to other sources of energy. The ETES system promises a greener future by providing an efficient measure to store and use the intermittent renewable energy sources.