One thing of great value in subterranean and deep sea underwater habitats is heat. Heat is used for many industrial processes including the desalination of seawater. District heating for keeping living and growing spaces comfortable is important in such habitats, and storing this heat for later use is also important as a means of storing power. The approach I'm probably going to use is molten salt, specifically "Norwegian saltpeter" or calcium nitrate.
Storing this heat in this form makes a lot of other things pretty straightforward. If nothing else, using the temperature difference between molten salt and liquid neon with a bank of thermopiles can generate quick electrical power in a pinch.
Liquid neon can be used for a lot of other things, as well, such as cooling superconducting magnets and superconducting maglev high speed railways.
Liquified neon and molten salt are both so useful that they can be exchanged in an infrastructural grid, and provide both district heating and cooling for entire underground or underwater cities.
Storing this heat in this form makes a lot of other things pretty straightforward. If nothing else, using the temperature difference between molten salt and liquid neon with a bank of thermopiles can generate quick electrical power in a pinch.
Liquid neon can be used for a lot of other things, as well, such as cooling superconducting magnets and superconducting maglev high speed railways.
Liquified neon and molten salt are both so useful that they can be exchanged in an infrastructural grid, and provide both district heating and cooling for entire underground or underwater cities.
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