Liquid Air Energy Storage

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By Peter Bragdon

 Liquid Air Energy Storage
My topic is liquid air energy storage. It is an environmentally friendly way to store energy. It works by taking excess energy from solar or wind power and using it to power an air liquifier. If energy is needed, the liquid air can be allowed to expand and power a turbine to generate energy.
Liquid air is a more environmentally friendly way to store power than batteries. Batteries use toxic chemicals and need to be replaced regularly, resulting in toxic waste. Getting rid of old batteries safely is difficult and costly. In contrast, the liquid air system does not produce a waste product. It uses something we have in ready supply, air. It also produces a safe byproduct, air. Liquid air can be used with other environmentally friendly energy sources such as solar and wind power, making it an ideal storage system for the ultimate environmentally friendly city.

Turning air into a storage system for energy requires an air liquifier. The air is cooled and condensed from 700 liters in its original form to 1 liter in its liquid form. The condensed air is stored in a well insulated container at the extremely cold temperature of -196o Celsius. This technology is similar to the way liquid nitrogen is formed and stored. Air is actually made up of just over two thirds nitrogen. In this case, instead of using pure nitrogen, this system just uses filtered air.
In order to use the liquid air for energy, it is allowed to heat up naturally and creates a high pressure gas. The high pressure gas can be used to turn a turbine and generate electricity. The difference in temperature between the cool and warm parts of this system can also be recaptured and channeled for other process or back into the system.

The next steps in the future of liquid air energy storage (LAES) is being able to use the cold released during the transition stage from liquid to gas air. The cold can be used to cool nearby buildings by circulating pipes with water or air through the chilling portion of the LAES system. In this way LAES is both an energy storage system and a supplementary HVAC system.
Using regular material like air and already existing technology is a simple way to create a new energy system in the near future. Thinking about even more ways to use the heat and cold parts of the LAES system makes this not only great for green energy storage but also part of more technological solutions.
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Image result for liquid air energy storage



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